Rectangle 27 8

<input type="file" name="file" id="fileLoader" /> 
<input type="button" id="fileSubmit" value="Upload"/>
var files = [];
$(document)
        .on(
                "change",
                "#fileLoader",
                function(event) {
                 files=event.target.files;
                })

$(document)
        .on(
                "click",
                "#fileSubmit",
                function() {
                processUpload();
                })

function processUpload()
          {
              var oMyForm = new FormData();
              oMyForm.append("file", files[0]);
             $
                .ajax({dataType : 'json',
                    url : "the url",
                    data : oMyForm,
                    type : "POST",
                    enctype: 'multipart/form-data',
                    processData: false, 
                    contentType:false,
                    success : function(result) {
                        //...;
                    },
                    error : function(result){
                        //...;
                    }
                });
          }
@RequestMapping(method = RequestMethod.POST, value = "the url")
    @ResponseBody
    public void uploadFile(@RequestParam("file") MultipartFile multipartFile) {
            //...
    }

ajax - Upload file + Form Data + Spring MVC + JQuery - Stack Overflow

jquery ajax forms
Rectangle 27 1

this worked like a charm for me:

$('#formId').submit(function(evt) {

            evt.preventDefault();

            var formData = new FormData(this);

            $.ajax({
            type: 'POST',
            url: "/url",
            data:formData,
            cache:false,
            contentType: false,
            processData: false,
            success: function(data) {
               alert('success');
            },
            error: function(data) {
                alert('failed');
            }
            });
        });

ajax - Upload file + Form Data + Spring MVC + JQuery - Stack Overflow

jquery ajax forms
Rectangle 27 3

I've used the jQuery File Upload widget with Spring MVC with controller code like the following (note there is a dependency on apache commons fileupload for handing the multipart content):

@RequestMapping(value="/project/file", method=POST) 
public void addFile(HttpServletRequest request, HttpServletResponse response) throws IOException {
        if (!ServletFileUpload.isMultipartContent(request)) {
            throw new IllegalArgumentException("Request is not multipart, please 'multipart/form-data' enctype for your form.");
        }
        ServletFileUpload uploadHandler = new ServletFileUpload(new DiskFileItemFactory());

        try {
            List<FileItem> items = uploadHandler.parseRequest(request);
            for (FileItem item : items) {
                if (!item.isFormField()) {
                    byte [] fileBytes = item.get();
                }
         } catch(FileUploadException e) {
             throw new RuntimeException(e);
         }

   }

thank you for your answer. I got into spring code with yours and i saw spring make already several of your code and now i could make my method.

java - jquery file upload with spring mvc : 400 bad request - Stack Ov...

java jquery spring-mvc file-upload asyncfileupload
Rectangle 27 3

I've used the jQuery File Upload widget with Spring MVC with controller code like the following (note there is a dependency on apache commons fileupload for handing the multipart content):

@RequestMapping(value="/project/file", method=POST) 
public void addFile(HttpServletRequest request, HttpServletResponse response) throws IOException {
        if (!ServletFileUpload.isMultipartContent(request)) {
            throw new IllegalArgumentException("Request is not multipart, please 'multipart/form-data' enctype for your form.");
        }
        ServletFileUpload uploadHandler = new ServletFileUpload(new DiskFileItemFactory());

        try {
            List<FileItem> items = uploadHandler.parseRequest(request);
            for (FileItem item : items) {
                if (!item.isFormField()) {
                    byte [] fileBytes = item.get();
                }
         } catch(FileUploadException e) {
             throw new RuntimeException(e);
         }

   }

thank you for your answer. I got into spring code with yours and i saw spring make already several of your code and now i could make my method.

java - jquery file upload with spring mvc : 400 bad request - Stack Ov...

java jquery spring-mvc file-upload asyncfileupload
Rectangle 27 4

Multiple File Upload using AngularJS: Server requesting with JSON text and multipart file data.

window.onload = function() {
 var app = angular.module("myapp", []);
    app.controller("uploadcontroller", function uploadcontrollerFun($scope, $http) {
      
      $scope.files = [];
      $scope.getFileDetails = function(e) {
        $scope.$apply(function() {
          for (var i = 0; i < e.files.length; i++) {
            var isFileAvailable = false;
            console.log("File Name  " + e.files[i].name);
            for (var j = 0; j < $scope.files.length; j++) {
              if ($scope.files[j].name === e.files[i].name) {
                isFileAvailable = true;
                break;
              }
            }
            if (!isFileAvailable) {
              $scope.files.push(e.files[i]);
            } else {
              alert("file is already available ::" + e.files[i].name)
            }
          }
        });
      }
      
      $scope.submitdata = function() {
        var data = new FormData();
        for (var i in $scope.files) {
          data.append("uploadFile[" + i + "]", $scope.files[i]);
        }
        data.append("key1", 'email');
        console.log("data",data);
        var targetRequestPath =  //'./UploadScenarioFiles'; // Controller URL
           'http://localhost:8080/PerformanceUI/UploadScenarioFiles';
        
        $http({
          method: 'POST',
          url: targetRequestPath,
          headers: {
            'Content-Type': undefined
          },
          data: data
        }).then(function(response) {
          console.log('Response Data : ', response.data);
          callback(response.data);
        })
      }
    });
}
<html>
 <head>
  <link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
  
  <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.9/angular.min.js"></script>
 </head>
 <body>
  <div class="form-group ng-scope" ng-app="myapp" ng-controller="uploadcontroller">
    <label class="control-label col-sm-3"> Import File 
      <span class="error">*</span>
    </label>
    <div class="col-lg-6 col-sm-6 col-12">
      <label class="btn btn-primary">
        <input type="file" id="f" accept=".txt,.csv,.jmx " multiple="" onchange="angular.element(this).scope().getFileDetails(this);this.value=null;">
      </label>
      <br><br>
      <button class="btn btn-success" ng-click="submitdata()">  submit </button>
    </div>
  </div>
 </body>
</html>
consume multipart and json text.
@RequestMapping(value = "/UploadScenarioFiles", method = RequestMethod.POST)
public void UploadscenarioFiles(HttpServletRequest request, HttpServletResponse response) {
    String param1;
    if (request != null) { // JSON Text
        param1 = request.getParameter("key1");
    }
    MultipartHttpServletRequest multipart = (MultipartHttpServletRequest) request;
    Iterator<String> fileNames = multipart.getFileNames();
    while (fileNames.hasNext()) { // Get List of files from Multipart Request.

        MultipartFile fileContent = multipart.getFile(fileNames.next());

        // Save files to Local (or) any Storage server.
        File file = new File("E:\\AA\\test\\"+fileContent.getOriginalFilename());
        fileContent.transferTo( file );

    }
}

We can set File size limit in the spring configurationFile link

<!-- setting maximum upload size -->
    <beans:property name="maxUploadSize" value="100000" />

</beans:bean>

javascript - How to send Multiple FIles along with the form data in an...

javascript java angularjs ng-file-upload
Rectangle 27 4

Multi-file upload, with support for drag and drop and multibrowser support, is not possible without some tricks.

With the jquery file upload plugin, you can set autoUpload to false, collect the files being added or dropped, and then on form submit, you cancel the normal submit request. Instead you do a single ajax call which will contain all your files and the form content. When the ajax call returns you can redirect back to your view page etc.

var filesList = new Array();
$(function () {
    $('#fileupload').fileupload({
        autoUpload: false,
     }).on('fileuploadadd', function (e, data) {
        $.each(data.files, function (index, file) {
            filesList.push(data.files[index]);
        });
    });
}
$("#uploadform").submit(function(event) {
    if (filesList.length > 0) {
        event.preventDefault();
        $('#fileupload').fileupload('send', {files: filesList})
            .complete(function (result, textStatus, jqXHR) { 
                // window.location='back to view-page after submit?'
            });
        } else {
            // plain default submit
        }
    });
});
[...]
<form id="uploadform" action="..." method="POST" enctype="multipart/form-data">
    <input type="text" name="dummy" placeholder="some other input field">
    <input id="fileupload" type="file" name="files" multiple="multiple">
</form>

I have described a fully working solution with a spring mvc controller in detail here

jQuery:File+Data upload using Blueimp File Upload plugin on form submi...

jquery blueimp
Rectangle 27 0

<input type="file" name="file" id="fileLoader" /> 
<input type="button" id="fileSubmit" value="Upload"/>
var files = [];
$(document)
        .on(
                "change",
                "#fileLoader",
                function(event) {
                 files=event.target.files;
                })

$(document)
        .on(
                "click",
                "#fileSubmit",
                function() {
                processUpload();
                })

function processUpload()
          {
              var oMyForm = new FormData();
              oMyForm.append("file", files[0]);
             $
                .ajax({dataType : 'json',
                    url : "the url",
                    data : oMyForm,
                    type : "POST",
                    enctype: 'multipart/form-data',
                    processData: false, 
                    contentType:false,
                    success : function(result) {
                        //...;
                    },
                    error : function(result){
                        //...;
                    }
                });
          }
@RequestMapping(method = RequestMethod.POST, value = "the url")
    @ResponseBody
    public void uploadFile(@RequestParam("file") MultipartFile multipartFile) {
            //...
    }

ajax - Upload file + Form Data + Spring MVC + JQuery - Stack Overflow

jquery ajax forms
Rectangle 27 0

function collectFormData(fields) {
    var formData = new FormData();

    for (var i = 0; i < fields.length; i++) {
        var $item = $(fields[i]);

        if ($item.attr('type') =="file"){
            var file = $('input[type=file]')[0].files[0];
            formData.append( $item.attr('name') , file);

        } else {
            formData.append( $item.attr('name') , $item.val());
        }
    }
    return formData;
}

and send:

var fields = form.find('input, textarea, select');
    var formData = collectFormData(fields);


    $.ajax({
        url: form.attr('action'),
        type: 'POST',
        scriptCharset: "utf-8",
        data: formData,
        async: false,
        cache: false,
        contentType: false,
        processData: false,
        timeout: 600000,
        success: function (response) {
            if (response.status == "SUCCESS"){
                console.log("SUCCESS...");
                $( document ).trigger( "SUCCESS", [ response ] );
            } else if (response.status == "FAIL"){
                console.log("FAIL...");
                clearErrors(form);

                ...
            }
        }
    })

ajax - Upload file + Form Data + Spring MVC + JQuery - Stack Overflow

jquery ajax forms
Rectangle 27 0

For the UI plugin, with jsp page and Spring MVC..

Sample html. Needs to be within a form element with an id attribute of fileupload

<!-- The fileupload-buttonbar contains buttons to add/delete files and start/cancel the upload -->
<div class="fileupload-buttonbar">
    <div>
        <!-- The fileinput-button span is used to style the file input field as button -->
        <span class="btn btn-success fileinput-button">
            <i class="glyphicon glyphicon-plus"></i>
            <span>Add files</span>
            <input id="fileuploadInput" type="file" name="files[]" multiple>
        </span>
        <%-- https://stackoverflow.com/questions/925334/how-is-the-default-submit-button-on-an-html-form-determined --%>
        <button type="button" class="btn btn-primary start">
            <i class="glyphicon glyphicon-upload"></i>
            <span>Start upload</span>
        </button>
        <button type="reset" class="btn btn-warning cancel">
            <i class="glyphicon glyphicon-ban-circle"></i>
            <span>Cancel upload</span>
        </button>
        <!-- The global file processing state -->
        <span class="fileupload-process"></span>
    </div>
    <!-- The global progress state -->
    <div class="fileupload-progress fade">
        <!-- The global progress bar -->
        <div class="progress progress-striped active" role="progressbar" aria-valuemin="0" aria-valuemax="100">
            <div class="progress-bar progress-bar-success" style="width:0%;"></div>
        </div>
        <!-- The extended global progress state -->
        <div class="progress-extended">&nbsp;</div>
    </div>
</div>
<!-- The table listing the files available for upload/download -->
<table role="presentation" class="table table-striped"><tbody class="files"></tbody></table>

<link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/css/jquery.fileupload.css">
<link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/css/jquery.fileupload-ui.css">

<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/vendor/jquery.ui.widget.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/jquery.iframe-transport.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/jquery.fileupload.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/jquery.fileupload-process.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/jquery.fileupload-validate.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/jquery.fileupload-ui.js"></script>

<script type="text/javascript">
    $(document).ready(function () {
            var maxFileSizeBytes = ${maxFileSizeBytes};
        if (maxFileSizeBytes < 0) {
            //-1 or any negative value means no size limit
            //set to undefined
            //https://stackoverflow.com/questions/5795936/how-to-set-a-javascript-var-as-undefined
            maxFileSizeBytes = void 0;
        }

        //https://github.com/blueimp/jQuery-File-Upload/wiki/Options
        //https://stackoverflow.com/questions/34063348/jquery-file-upload-basic-plus-ui-and-i18n
        //https://stackoverflow.com/questions/11337897/how-to-customize-upload-download-template-of-blueimp-jquery-file-upload
        $('#fileupload').fileupload({
            url: '${pageContext.request.contextPath}/app/uploadResources.do',
            fileInput: $('#fileuploadInput'),
            acceptFileTypes: /(\.|\/)(jrxml|png|jpe?g)$/i,
            maxFileSize: maxFileSizeBytes,
            messages: {
                acceptFileTypes: '${fileTypeNotAllowedText}',
                maxFileSize: '${fileTooLargeMBText}'
            },
            filesContainer: $('.files'),
            uploadTemplateId: null,
            downloadTemplateId: null,
            uploadTemplate: function (o) {
                var rows = $();
                $.each(o.files, function (index, file) {
                    var row = $('<tr class="template-upload fade">' +
                            '<td><p class="name"></p>' +
                            '<strong class="error text-danger"></strong>' +
                            '</td>' +
                            '<td><p class="size"></p>' +
                            '<div class="progress progress-striped active" role="progressbar" aria-valuemin="0" aria-valuemax="100" aria-valuenow="0">' +
                            '<div class="progress-bar progress-bar-success" style="width:0%;"></div></div>' +
                            '</td>' +
                            '<td>' +
                            (!index && !o.options.autoUpload ?
                                    '<button class="btn btn-primary start" disabled>' +
                                    '<i class="glyphicon glyphicon-upload"></i> ' +
                                    '<span>${startText}</span>' +
                                    '</button>' : '') +
                            (!index ? '<button class="btn btn-warning cancel">' +
                                    '<i class="glyphicon glyphicon-ban-circle"></i> ' +
                                    '<span>${cancelText}</span>' +
                                    '</button>' : '') +
                            '</td>' +
                            '</tr>');
                    row.find('.name').text(file.name);
                    row.find('.size').text(o.formatFileSize(file.size));
                    if (file.error) {
                        row.find('.error').text(file.error);
                    }
                    rows = rows.add(row);
                });
                return rows;
            },
            downloadTemplate: function (o) {
                var rows = $();
                $.each(o.files, function (index, file) {
                    var row = $('<tr class="template-download fade">' +
                            '<td><p class="name"></p>' +
                            (file.error ? '<strong class="error text-danger"></strong>' : '') +
                            '</td>' +
                            '<td><span class="size"></span></td>' +
                            '<td>' +
                            (file.deleteUrl ? '<button class="btn btn-danger delete">' +
                                    '<i class="glyphicon glyphicon-trash"></i> ' +
                                    '<span>${deleteText}</span>' +
                                    '</button>' : '') +
                            '<button class="btn btn-warning cancel">' +
                            '<i class="glyphicon glyphicon-ban-circle"></i> ' +
                            '<span>${clearText}</span>' +
                            '</button>' +
                            '</td>' +
                            '</tr>');
                    row.find('.name').text(file.name);
                    row.find('.size').text(o.formatFileSize(file.size));
                    if (file.error) {
                        row.find('.error').text(file.error);
                    }
                    if (file.deleteUrl) {
                        row.find('button.delete')
                                .attr('data-type', file.deleteType)
                                .attr('data-url', file.deleteUrl);
                    }
                    rows = rows.add(row);
                });
                return rows;
            }
        });

    });
</script>
@PostMapping("/app/uploadResources")
public @ResponseBody
Map<String, List<FileUploadResponse>> uploadResources(MultipartHttpServletRequest request,
        Locale locale) {
    //https://github.com/jdmr/fileUpload/blob/master/src/main/java/org/davidmendoza/fileUpload/web/ImageController.java
    //https://github.com/blueimp/jQuery-File-Upload/wiki/Setup#using-jquery-file-upload-ui-version-with-a-custom-server-side-upload-handler
    Map<String, List<FileUploadResponse>> response = new HashMap<>();
    List<FileUploadResponse> fileList = new ArrayList<>();

    String deleteUrlBase = request.getContextPath() + "/app/deleteResources.do?filename=";

    //http://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/web/multipart/MultipartRequest.html
    Iterator<String> itr = request.getFileNames();
    while (itr.hasNext()) {
        String htmlParamName = itr.next();
        MultipartFile file = request.getFile(htmlParamName);
        FileUploadResponse fileDetails = new FileUploadResponse();
        String filename = file.getOriginalFilename();
        fileDetails.setName(filename);
        fileDetails.setSize(file.getSize());
        try {
            String message = saveFile(file);
            if (message != null) {
                String errorMessage = messageSource.getMessage(message, null, locale);
                fileDetails.setError(errorMessage);
            } else {
                //save successful
                String encodedFilename = URLEncoder.encode(filename, "UTF-8");
                String deleteUrl = deleteUrlBase + encodedFilename;
                fileDetails.setDeleteUrl(deleteUrl);
            }
        } catch (IOException ex) {
            logger.error("Error", ex);
            fileDetails.setError(ex.getMessage());
        }

        fileList.add(fileDetails);
    }

    response.put("files", fileList);

    return response;
}

@PostMapping("/app/deleteResources")
public @ResponseBody
Map<String, List<Map<String, Boolean>>> deleteResources(@RequestParam("filename") List<String> filenames) {
    Map<String, List<Map<String, Boolean>>> response = new HashMap<>();
    List<Map<String, Boolean>> fileList = new ArrayList<>();

    String templatesPath = Config.getTemplatesPath();
    for (String filename : filenames) {
        Map<String, Boolean> fileDetails = new HashMap<>();

        String cleanFilename = ArtUtils.cleanFileName(filename);
        String filePath = templatesPath + cleanFilename;

        File file = new File(filePath);
        boolean deleted = file.delete();

        if (deleted) {
            fileDetails.put(cleanFilename, true);
        } else {
            fileDetails.put(cleanFilename, false);
        }

        fileList.add(fileDetails);
    }

    response.put("files", fileList);

    return response;
}

Sample class for generating the required json response

public class FileUploadResponse {
    //https://github.com/blueimp/jQuery-File-Upload/wiki/Setup#using-jquery-file-upload-ui-version-with-a-custom-server-side-upload-handler

    private String name;
    private long size;
    private String error;
    private String deleteType = "POST";
    private String deleteUrl;

    /**
     * @return the name
     */
    public String getName() {
        return name;
    }

    /**
     * @param name the name to set
     */
    public void setName(String name) {
        this.name = name;
    }

    /**
     * @return the size
     */
    public long getSize() {
        return size;
    }

    /**
     * @param size the size to set
     */
    public void setSize(long size) {
        this.size = size;
    }

    /**
     * @return the error
     */
    public String getError() {
        return error;
    }

    /**
     * @param error the error to set
     */
    public void setError(String error) {
        this.error = error;
    }

    /**
     * @return the deleteType
     */
    public String getDeleteType() {
        return deleteType;
    }

    /**
     * @param deleteType the deleteType to set
     */
    public void setDeleteType(String deleteType) {
        this.deleteType = deleteType;
    }

    /**
     * @return the deleteUrl
     */
    public String getDeleteUrl() {
        return deleteUrl;
    }

    /**
     * @param deleteUrl the deleteUrl to set
     */
    public void setDeleteUrl(String deleteUrl) {
        this.deleteUrl = deleteUrl;
    }

}

Can someone explain how to implement the jQuery File Upload plugin? - ...

jquery file-upload jquery-plugins jquery-file-upload
Rectangle 27 0

The attached is a Maven project;
The server side code is implemented as a Spring MVC controller;
The client side code is implemented in the simple "index.jsp" file;
The project uses Java 8 and Tomcat 7. If you want to try this example by yourself, I would recommend JDK 8 and Eclipse Luna Java EE IDE for web developers or above.
I will assume that you have some general background on Maven, Spring MVC, and jQuery. If you are not familiar with these, you can always check out the internet to get the ideas on them.

The server side code
The attached is a Maven project, the POM file is the following:

Hide   Shrink    Copy Code
<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

  <modelVersion>4.0.0</modelVersion>
  <groupId>com.song.example</groupId>
  <artifactId>jquery-simple-upload</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>

    <properties>
        <spring.version>4.1.7.RELEASE</spring.version>
        <jackson.version>2.6.1</jackson.version>
        <tomcat.version>7.0.55</tomcat.version>
    </properties>

    <dependencies>
        <!-- Minimal dependencies for Spring MVC -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <!-- Multi-part file support -->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.1</version>
        </dependency>

        <!-- Jackson dependencies -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>${jackson.version}</version>
        </dependency>
        <dependency>
              <groupId>com.fasterxml.jackson.core</groupId>
              <artifactId>jackson-databind</artifactId>
              <version>${jackson.version}</version>
        </dependency>

        <!-- Sevlet jars for compilation, provided by Tomcat -->
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-servlet-api</artifactId>
            <version>${tomcat.version}</version>
            <scope>provided</scope>
        </dependency>

    </dependencies>

    <build>
        <plugins>     
            <plugin>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.4</version>
                <configuration>
                    <warSourceDirectory>webcontent</warSourceDirectory>
                    <failOnMissingWebXml>true</failOnMissingWebXml>
                </configuration>
            </plugin>

            <plugin>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.3</version>
                    <configuration>
                      <source>1.8</source>
                      <target>1.8</target>
                    </configuration>
                </plugin>
        </plugins>
    </build>
</project>
The "web.xml" and the "mvc-dispatcher-servlet.xml" file are the following:

Hide   Shrink    Copy Code
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
        http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    id="WebApp_ID" version="3.0">

    <display-name>D3 Example</display-name>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>

    <filter>
        <filter-name>nocachefilter</filter-name>
        <filter-class>com.song.example.filter.NocacheFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>nocachefilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <servlet>
        <servlet-name>mvc-dispatcher</servlet-name>
          <servlet-class>
              org.springframework.web.servlet.DispatcherServlet
          </servlet-class>
          <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>mvc-dispatcher</servlet-name>
        <url-pattern>/api/*</url-pattern>
    </servlet-mapping>

    <context-param>
        <param-name>BaseUrl</param-name>
          <param-value>
            http://localhost:8080/jquery-simple-upload/
          </param-value>
    </context-param>

</web-app>
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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p" 
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.2.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">

     <context:component-scan base-package="com.song.example.controller" />
     <mvc:annotation-driven />

     <bean id="multipartResolver"
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize" value="1048576"/>
    </bean>
</beans>
The MVC controller that takes the uploaded file is implemented in the "FileController" file:

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package com.song.example.controller;

import java.io.InputStream;
import java.util.HashMap;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.io.IOUtils;
import org.springframework.stereotype.Controller;
import org.springframework.util.Base64Utils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

@Controller
public class FileController {

    @RequestMapping(value = "/echofile", method = RequestMethod.POST, produces = {"application/json"})
    public @ResponseBody HashMap<String, Object> echoFile(MultipartHttpServletRequest request,
            HttpServletResponse response) throws Exception {

        MultipartFile multipartFile = request.getFile("file");
        Long size = multipartFile.getSize();
        String contentType = multipartFile.getContentType();
        InputStream stream = multipartFile.getInputStream();
        byte[] bytes = IOUtils.toByteArray(stream);

        HashMap<String, Object> map = new HashMap<String, Object>();
        map.put("fileoriginalsize", size);
        map.put("contenttype", contentType);
        map.put("base64", new String(Base64Utils.encode(bytes)));

        return map;
    }
}
The "echoFile()" method takes the uploaded file though the "MultipartHttpServletRequest" object;
It converts the file content into Base64 format and returns the Base64 content in the JSON response;
The goal of this example is to use jQuery Ajax to upload a file to the server and receive the responded JSON object. Now let us take a look at the client side code.

The client side code
The client side code is implemented in the "index.jsp" file. The HTML part of the file is the following:

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<body style="font-family: calibri; font-size: 8pt">
<div>
<form id="fileForm">
    <input type="file" name="file" />
    <button id="btnUpload" type="button">Upload file</button>
    <button id="btnClear" type="button">Clear</button>
</form>
<div id="imgContainer"></div>
</div>
</body>
The Javascript part of the file is the following:

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<script type="text/javascript">

var isJpg = function(name) {
    return name.match(/jpg$/i)
};

var isPng = function(name) {
    return name.match(/png$/i)
};

$(document).ready(function() {
    var file = $('[name="file"]');
    var imgContainer = $('#imgContainer');

    $('#btnUpload').on('click', function() {
        var filename = $.trim(file.val());

        if (!(isJpg(filename) || isPng(filename))) {
            alert('Please browse a JPG/PNG file to upload ...');
            return;
        }

        $.ajax({
            url: '<%=baseUrl%>api/echofile',
            type: "POST",
            data: new FormData(document.getElementById("fileForm")),
            enctype: 'multipart/form-data',
            processData: false,
            contentType: false
          }).done(function(data) {
              imgContainer.html('');
              var img = '<img src="data:' + data.contenttype + ';base64,'
                  + data.base64 + '"/>';

              imgContainer.append(img);
          }).fail(function(jqXHR, textStatus) {
              //alert(jqXHR.responseText);
              alert('File upload failed ...');
          });

    });

    $('#btnClear').on('click', function() {
        imgContainer.html('');
        file.val('');
    });
});

</script>
The jQuery reference is to the jQuery CDN "<script src="//code.jquery.com/jquery-2.1.4.min.js"></script>". If you want to run this example on your own computer, you need to make sure that you have the internet access, so your browser can download jQuery from the CDN.

The HTML part declared a file input in an HTML form;
In the click event of the "btnUpload" button, an Ajax call is issued to upload the file. The data to be uploaded is a "FormData" object;
Upon a success Ajax call, a JSON response is received. The JSON object should have the Base64 content responded from the server.
In order to show the responded data, I insisted that only JPG/PNG images can be uploaded. The responded Base64 image will be displayed on the web page.

asp.net - Send value and file from view to controller by ajax method -...

asp.net ajax file controller asp.net-mvc-5
Rectangle 27 0

File uploading using AJAX is not possible. AJAX doesnt actually post forms to the server, it sends selected data to the server in the form of a POST or GET request. As javascript is not capable of grabbing the file from the users machine and sending it to the server, its just not possible with AJAX. You have to resort to regular old form submit.

ajax - Upload file + Form Data + Spring MVC + JQuery - Stack Overflow

jquery ajax forms
Rectangle 27 0

For the UI plugin, with jsp page and Spring MVC..

Sample html. Needs to be within a form element with an id attribute of fileupload

<!-- The fileupload-buttonbar contains buttons to add/delete files and start/cancel the upload -->
<div class="fileupload-buttonbar">
    <div>
        <!-- The fileinput-button span is used to style the file input field as button -->
        <span class="btn btn-success fileinput-button">
            <i class="glyphicon glyphicon-plus"></i>
            <span>Add files</span>
            <input id="fileuploadInput" type="file" name="files[]" multiple>
        </span>
        <%-- https://stackoverflow.com/questions/925334/how-is-the-default-submit-button-on-an-html-form-determined --%>
        <button type="button" class="btn btn-primary start">
            <i class="glyphicon glyphicon-upload"></i>
            <span>Start upload</span>
        </button>
        <button type="reset" class="btn btn-warning cancel">
            <i class="glyphicon glyphicon-ban-circle"></i>
            <span>Cancel upload</span>
        </button>
        <!-- The global file processing state -->
        <span class="fileupload-process"></span>
    </div>
    <!-- The global progress state -->
    <div class="fileupload-progress fade">
        <!-- The global progress bar -->
        <div class="progress progress-striped active" role="progressbar" aria-valuemin="0" aria-valuemax="100">
            <div class="progress-bar progress-bar-success" style="width:0%;"></div>
        </div>
        <!-- The extended global progress state -->
        <div class="progress-extended">&nbsp;</div>
    </div>
</div>
<!-- The table listing the files available for upload/download -->
<table role="presentation" class="table table-striped"><tbody class="files"></tbody></table>

<link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/css/jquery.fileupload.css">
<link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/css/jquery.fileupload-ui.css">

<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/vendor/jquery.ui.widget.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/jquery.iframe-transport.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/jquery.fileupload.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/jquery.fileupload-process.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/jquery.fileupload-validate.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/jquery.fileupload-ui.js"></script>

<script type="text/javascript">
    $(document).ready(function () {
            var maxFileSizeBytes = ${maxFileSizeBytes};
        if (maxFileSizeBytes < 0) {
            //-1 or any negative value means no size limit
            //set to undefined
            //https://stackoverflow.com/questions/5795936/how-to-set-a-javascript-var-as-undefined
            maxFileSizeBytes = void 0;
        }

        //https://github.com/blueimp/jQuery-File-Upload/wiki/Options
        //https://stackoverflow.com/questions/34063348/jquery-file-upload-basic-plus-ui-and-i18n
        //https://stackoverflow.com/questions/11337897/how-to-customize-upload-download-template-of-blueimp-jquery-file-upload
        $('#fileupload').fileupload({
            url: '${pageContext.request.contextPath}/app/uploadResources.do',
            fileInput: $('#fileuploadInput'),
            acceptFileTypes: /(\.|\/)(jrxml|png|jpe?g)$/i,
            maxFileSize: maxFileSizeBytes,
            messages: {
                acceptFileTypes: '${fileTypeNotAllowedText}',
                maxFileSize: '${fileTooLargeMBText}'
            },
            filesContainer: $('.files'),
            uploadTemplateId: null,
            downloadTemplateId: null,
            uploadTemplate: function (o) {
                var rows = $();
                $.each(o.files, function (index, file) {
                    var row = $('<tr class="template-upload fade">' +
                            '<td><p class="name"></p>' +
                            '<strong class="error text-danger"></strong>' +
                            '</td>' +
                            '<td><p class="size"></p>' +
                            '<div class="progress progress-striped active" role="progressbar" aria-valuemin="0" aria-valuemax="100" aria-valuenow="0">' +
                            '<div class="progress-bar progress-bar-success" style="width:0%;"></div></div>' +
                            '</td>' +
                            '<td>' +
                            (!index && !o.options.autoUpload ?
                                    '<button class="btn btn-primary start" disabled>' +
                                    '<i class="glyphicon glyphicon-upload"></i> ' +
                                    '<span>${startText}</span>' +
                                    '</button>' : '') +
                            (!index ? '<button class="btn btn-warning cancel">' +
                                    '<i class="glyphicon glyphicon-ban-circle"></i> ' +
                                    '<span>${cancelText}</span>' +
                                    '</button>' : '') +
                            '</td>' +
                            '</tr>');
                    row.find('.name').text(file.name);
                    row.find('.size').text(o.formatFileSize(file.size));
                    if (file.error) {
                        row.find('.error').text(file.error);
                    }
                    rows = rows.add(row);
                });
                return rows;
            },
            downloadTemplate: function (o) {
                var rows = $();
                $.each(o.files, function (index, file) {
                    var row = $('<tr class="template-download fade">' +
                            '<td><p class="name"></p>' +
                            (file.error ? '<strong class="error text-danger"></strong>' : '') +
                            '</td>' +
                            '<td><span class="size"></span></td>' +
                            '<td>' +
                            (file.deleteUrl ? '<button class="btn btn-danger delete">' +
                                    '<i class="glyphicon glyphicon-trash"></i> ' +
                                    '<span>${deleteText}</span>' +
                                    '</button>' : '') +
                            '<button class="btn btn-warning cancel">' +
                            '<i class="glyphicon glyphicon-ban-circle"></i> ' +
                            '<span>${clearText}</span>' +
                            '</button>' +
                            '</td>' +
                            '</tr>');
                    row.find('.name').text(file.name);
                    row.find('.size').text(o.formatFileSize(file.size));
                    if (file.error) {
                        row.find('.error').text(file.error);
                    }
                    if (file.deleteUrl) {
                        row.find('button.delete')
                                .attr('data-type', file.deleteType)
                                .attr('data-url', file.deleteUrl);
                    }
                    rows = rows.add(row);
                });
                return rows;
            }
        });

    });
</script>
@PostMapping("/app/uploadResources")
public @ResponseBody
Map<String, List<FileUploadResponse>> uploadResources(MultipartHttpServletRequest request,
        Locale locale) {
    //https://github.com/jdmr/fileUpload/blob/master/src/main/java/org/davidmendoza/fileUpload/web/ImageController.java
    //https://github.com/blueimp/jQuery-File-Upload/wiki/Setup#using-jquery-file-upload-ui-version-with-a-custom-server-side-upload-handler
    Map<String, List<FileUploadResponse>> response = new HashMap<>();
    List<FileUploadResponse> fileList = new ArrayList<>();

    String deleteUrlBase = request.getContextPath() + "/app/deleteResources.do?filename=";

    //http://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/web/multipart/MultipartRequest.html
    Iterator<String> itr = request.getFileNames();
    while (itr.hasNext()) {
        String htmlParamName = itr.next();
        MultipartFile file = request.getFile(htmlParamName);
        FileUploadResponse fileDetails = new FileUploadResponse();
        String filename = file.getOriginalFilename();
        fileDetails.setName(filename);
        fileDetails.setSize(file.getSize());
        try {
            String message = saveFile(file);
            if (message != null) {
                String errorMessage = messageSource.getMessage(message, null, locale);
                fileDetails.setError(errorMessage);
            } else {
                //save successful
                String encodedFilename = URLEncoder.encode(filename, "UTF-8");
                String deleteUrl = deleteUrlBase + encodedFilename;
                fileDetails.setDeleteUrl(deleteUrl);
            }
        } catch (IOException ex) {
            logger.error("Error", ex);
            fileDetails.setError(ex.getMessage());
        }

        fileList.add(fileDetails);
    }

    response.put("files", fileList);

    return response;
}

@PostMapping("/app/deleteResources")
public @ResponseBody
Map<String, List<Map<String, Boolean>>> deleteResources(@RequestParam("filename") List<String> filenames) {
    Map<String, List<Map<String, Boolean>>> response = new HashMap<>();
    List<Map<String, Boolean>> fileList = new ArrayList<>();

    String templatesPath = Config.getTemplatesPath();
    for (String filename : filenames) {
        Map<String, Boolean> fileDetails = new HashMap<>();

        String cleanFilename = ArtUtils.cleanFileName(filename);
        String filePath = templatesPath + cleanFilename;

        File file = new File(filePath);
        boolean deleted = file.delete();

        if (deleted) {
            fileDetails.put(cleanFilename, true);
        } else {
            fileDetails.put(cleanFilename, false);
        }

        fileList.add(fileDetails);
    }

    response.put("files", fileList);

    return response;
}

Sample class for generating the required json response

public class FileUploadResponse {
    //https://github.com/blueimp/jQuery-File-Upload/wiki/Setup#using-jquery-file-upload-ui-version-with-a-custom-server-side-upload-handler

    private String name;
    private long size;
    private String error;
    private String deleteType = "POST";
    private String deleteUrl;

    /**
     * @return the name
     */
    public String getName() {
        return name;
    }

    /**
     * @param name the name to set
     */
    public void setName(String name) {
        this.name = name;
    }

    /**
     * @return the size
     */
    public long getSize() {
        return size;
    }

    /**
     * @param size the size to set
     */
    public void setSize(long size) {
        this.size = size;
    }

    /**
     * @return the error
     */
    public String getError() {
        return error;
    }

    /**
     * @param error the error to set
     */
    public void setError(String error) {
        this.error = error;
    }

    /**
     * @return the deleteType
     */
    public String getDeleteType() {
        return deleteType;
    }

    /**
     * @param deleteType the deleteType to set
     */
    public void setDeleteType(String deleteType) {
        this.deleteType = deleteType;
    }

    /**
     * @return the deleteUrl
     */
    public String getDeleteUrl() {
        return deleteUrl;
    }

    /**
     * @param deleteUrl the deleteUrl to set
     */
    public void setDeleteUrl(String deleteUrl) {
        this.deleteUrl = deleteUrl;
    }

}

Can someone explain how to implement the jQuery File Upload plugin? - ...

jquery file-upload jquery-plugins jquery-file-upload
Rectangle 27 0

For the UI plugin, with jsp page and Spring MVC..

Sample html. Needs to be within a form element with an id attribute of fileupload

<!-- The fileupload-buttonbar contains buttons to add/delete files and start/cancel the upload -->
<div class="fileupload-buttonbar">
    <div>
        <!-- The fileinput-button span is used to style the file input field as button -->
        <span class="btn btn-success fileinput-button">
            <i class="glyphicon glyphicon-plus"></i>
            <span>Add files</span>
            <input id="fileuploadInput" type="file" name="files[]" multiple>
        </span>
        <%-- https://stackoverflow.com/questions/925334/how-is-the-default-submit-button-on-an-html-form-determined --%>
        <button type="button" class="btn btn-primary start">
            <i class="glyphicon glyphicon-upload"></i>
            <span>Start upload</span>
        </button>
        <button type="reset" class="btn btn-warning cancel">
            <i class="glyphicon glyphicon-ban-circle"></i>
            <span>Cancel upload</span>
        </button>
        <!-- The global file processing state -->
        <span class="fileupload-process"></span>
    </div>
    <!-- The global progress state -->
    <div class="fileupload-progress fade">
        <!-- The global progress bar -->
        <div class="progress progress-striped active" role="progressbar" aria-valuemin="0" aria-valuemax="100">
            <div class="progress-bar progress-bar-success" style="width:0%;"></div>
        </div>
        <!-- The extended global progress state -->
        <div class="progress-extended">&nbsp;</div>
    </div>
</div>
<!-- The table listing the files available for upload/download -->
<table role="presentation" class="table table-striped"><tbody class="files"></tbody></table>

<link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/css/jquery.fileupload.css">
<link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/css/jquery.fileupload-ui.css">

<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/vendor/jquery.ui.widget.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/jquery.iframe-transport.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/jquery.fileupload.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/jquery.fileupload-process.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/jquery.fileupload-validate.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/jquery.fileupload-ui.js"></script>

<script type="text/javascript">
    $(document).ready(function () {
            var maxFileSizeBytes = ${maxFileSizeBytes};
        if (maxFileSizeBytes < 0) {
            //-1 or any negative value means no size limit
            //set to undefined
            //https://stackoverflow.com/questions/5795936/how-to-set-a-javascript-var-as-undefined
            maxFileSizeBytes = void 0;
        }

        //https://github.com/blueimp/jQuery-File-Upload/wiki/Options
        //https://stackoverflow.com/questions/34063348/jquery-file-upload-basic-plus-ui-and-i18n
        //https://stackoverflow.com/questions/11337897/how-to-customize-upload-download-template-of-blueimp-jquery-file-upload
        $('#fileupload').fileupload({
            url: '${pageContext.request.contextPath}/app/uploadResources.do',
            fileInput: $('#fileuploadInput'),
            acceptFileTypes: /(\.|\/)(jrxml|png|jpe?g)$/i,
            maxFileSize: maxFileSizeBytes,
            messages: {
                acceptFileTypes: '${fileTypeNotAllowedText}',
                maxFileSize: '${fileTooLargeMBText}'
            },
            filesContainer: $('.files'),
            uploadTemplateId: null,
            downloadTemplateId: null,
            uploadTemplate: function (o) {
                var rows = $();
                $.each(o.files, function (index, file) {
                    var row = $('<tr class="template-upload fade">' +
                            '<td><p class="name"></p>' +
                            '<strong class="error text-danger"></strong>' +
                            '</td>' +
                            '<td><p class="size"></p>' +
                            '<div class="progress progress-striped active" role="progressbar" aria-valuemin="0" aria-valuemax="100" aria-valuenow="0">' +
                            '<div class="progress-bar progress-bar-success" style="width:0%;"></div></div>' +
                            '</td>' +
                            '<td>' +
                            (!index && !o.options.autoUpload ?
                                    '<button class="btn btn-primary start" disabled>' +
                                    '<i class="glyphicon glyphicon-upload"></i> ' +
                                    '<span>${startText}</span>' +
                                    '</button>' : '') +
                            (!index ? '<button class="btn btn-warning cancel">' +
                                    '<i class="glyphicon glyphicon-ban-circle"></i> ' +
                                    '<span>${cancelText}</span>' +
                                    '</button>' : '') +
                            '</td>' +
                            '</tr>');
                    row.find('.name').text(file.name);
                    row.find('.size').text(o.formatFileSize(file.size));
                    if (file.error) {
                        row.find('.error').text(file.error);
                    }
                    rows = rows.add(row);
                });
                return rows;
            },
            downloadTemplate: function (o) {
                var rows = $();
                $.each(o.files, function (index, file) {
                    var row = $('<tr class="template-download fade">' +
                            '<td><p class="name"></p>' +
                            (file.error ? '<strong class="error text-danger"></strong>' : '') +
                            '</td>' +
                            '<td><span class="size"></span></td>' +
                            '<td>' +
                            (file.deleteUrl ? '<button class="btn btn-danger delete">' +
                                    '<i class="glyphicon glyphicon-trash"></i> ' +
                                    '<span>${deleteText}</span>' +
                                    '</button>' : '') +
                            '<button class="btn btn-warning cancel">' +
                            '<i class="glyphicon glyphicon-ban-circle"></i> ' +
                            '<span>${clearText}</span>' +
                            '</button>' +
                            '</td>' +
                            '</tr>');
                    row.find('.name').text(file.name);
                    row.find('.size').text(o.formatFileSize(file.size));
                    if (file.error) {
                        row.find('.error').text(file.error);
                    }
                    if (file.deleteUrl) {
                        row.find('button.delete')
                                .attr('data-type', file.deleteType)
                                .attr('data-url', file.deleteUrl);
                    }
                    rows = rows.add(row);
                });
                return rows;
            }
        });

    });
</script>
@PostMapping("/app/uploadResources")
public @ResponseBody
Map<String, List<FileUploadResponse>> uploadResources(MultipartHttpServletRequest request,
        Locale locale) {
    //https://github.com/jdmr/fileUpload/blob/master/src/main/java/org/davidmendoza/fileUpload/web/ImageController.java
    //https://github.com/blueimp/jQuery-File-Upload/wiki/Setup#using-jquery-file-upload-ui-version-with-a-custom-server-side-upload-handler
    Map<String, List<FileUploadResponse>> response = new HashMap<>();
    List<FileUploadResponse> fileList = new ArrayList<>();

    String deleteUrlBase = request.getContextPath() + "/app/deleteResources.do?filename=";

    //http://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/web/multipart/MultipartRequest.html
    Iterator<String> itr = request.getFileNames();
    while (itr.hasNext()) {
        String htmlParamName = itr.next();
        MultipartFile file = request.getFile(htmlParamName);
        FileUploadResponse fileDetails = new FileUploadResponse();
        String filename = file.getOriginalFilename();
        fileDetails.setName(filename);
        fileDetails.setSize(file.getSize());
        try {
            String message = saveFile(file);
            if (message != null) {
                String errorMessage = messageSource.getMessage(message, null, locale);
                fileDetails.setError(errorMessage);
            } else {
                //save successful
                String encodedFilename = URLEncoder.encode(filename, "UTF-8");
                String deleteUrl = deleteUrlBase + encodedFilename;
                fileDetails.setDeleteUrl(deleteUrl);
            }
        } catch (IOException ex) {
            logger.error("Error", ex);
            fileDetails.setError(ex.getMessage());
        }

        fileList.add(fileDetails);
    }

    response.put("files", fileList);

    return response;
}

@PostMapping("/app/deleteResources")
public @ResponseBody
Map<String, List<Map<String, Boolean>>> deleteResources(@RequestParam("filename") List<String> filenames) {
    Map<String, List<Map<String, Boolean>>> response = new HashMap<>();
    List<Map<String, Boolean>> fileList = new ArrayList<>();

    String templatesPath = Config.getTemplatesPath();
    for (String filename : filenames) {
        Map<String, Boolean> fileDetails = new HashMap<>();

        String cleanFilename = ArtUtils.cleanFileName(filename);
        String filePath = templatesPath + cleanFilename;

        File file = new File(filePath);
        boolean deleted = file.delete();

        if (deleted) {
            fileDetails.put(cleanFilename, true);
        } else {
            fileDetails.put(cleanFilename, false);
        }

        fileList.add(fileDetails);
    }

    response.put("files", fileList);

    return response;
}

Sample class for generating the required json response

public class FileUploadResponse {
    //https://github.com/blueimp/jQuery-File-Upload/wiki/Setup#using-jquery-file-upload-ui-version-with-a-custom-server-side-upload-handler

    private String name;
    private long size;
    private String error;
    private String deleteType = "POST";
    private String deleteUrl;

    /**
     * @return the name
     */
    public String getName() {
        return name;
    }

    /**
     * @param name the name to set
     */
    public void setName(String name) {
        this.name = name;
    }

    /**
     * @return the size
     */
    public long getSize() {
        return size;
    }

    /**
     * @param size the size to set
     */
    public void setSize(long size) {
        this.size = size;
    }

    /**
     * @return the error
     */
    public String getError() {
        return error;
    }

    /**
     * @param error the error to set
     */
    public void setError(String error) {
        this.error = error;
    }

    /**
     * @return the deleteType
     */
    public String getDeleteType() {
        return deleteType;
    }

    /**
     * @param deleteType the deleteType to set
     */
    public void setDeleteType(String deleteType) {
        this.deleteType = deleteType;
    }

    /**
     * @return the deleteUrl
     */
    public String getDeleteUrl() {
        return deleteUrl;
    }

    /**
     * @param deleteUrl the deleteUrl to set
     */
    public void setDeleteUrl(String deleteUrl) {
        this.deleteUrl = deleteUrl;
    }

}

Can someone explain how to implement the jQuery File Upload plugin? - ...

jquery file-upload jquery-plugins jquery-file-upload
Rectangle 27 -1

File uploading using AJAX is not possible. AJAX doesnt actually post forms to the server, it sends selected data to the server in the form of a POST or GET request. As javascript is not capable of grabbing the file from the users machine and sending it to the server, its just not possible with AJAX. You have to resort to regular old form submit.

ajax - Upload file + Form Data + Spring MVC + JQuery - Stack Overflow

jquery ajax forms