Spring MVC 如何上传多个文件到指定位置

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Spring MVC Tutorial: How to Upload Multiple Files to Specific Location

SHORT LINK:

Last Updated on February 10th, 2015 by Crunchify 22 Comments

This is another complete Spring MVC tutorial which accepts file on Upload form and copy it to specificfolder on “Submit” event. As usual we have a dependency on Hello World Spring MVC Example.

Spring MVC 怎么上传多个文件到指定位置

So, these are the additions / changes we need to perform in this example:

New file: CrunchifyFileUploadController.java
New file: CrunchifyFileUpload.java
New file: uploadfile.jsp
New file: uploadfilesuccess.jsp
Modified file: crunchify-servlet.xml
2 new jar files: commons-io-2.4.jar and commons-fileupload-1.3.jar

Here is a final project structure so you will get some idea on where to add files.

Spring MVC 怎么上传多个文件到指定位置

Now let’s get started:

Step1: Pre-Requisite:

http://crunchify.com/hello-world-example-spring-mvc-3-2-1/ (Deploy this project successfully onTomcat)

Maven Dependencies:

Add below new dependencies to your project’s pom.xml file.

Add belwo to pom.xml file

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		<dependency>

			<groupId>commons-fileupload</groupId>

			<artifactId>commons-fileupload</artifactId>

			<version>1.2</version>

		</dependency>

		<dependency>

			<groupId>commons-io</groupId>

			<artifactId>commons-io</artifactId>

			<version>1.4</version>

		</dependency>

Step2: SpringController

Create a Spring 3 MVC based controller which handles file upload. There are two methods in thiscontroller:

crunchifyDisplayForm – It simply forwards request to the pageuploadfile.jsp
crunchifySave – Fetches the form using @ModelAttribute annotation and get the File content from it. It creates a list of filenames of files being uploaded and pass this list to success page.

CrunchifyFileUploadController.javaJava

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package com.crunchify.controller;
 

import com.crunchify.form.CrunchifyFileUpload;
 

import java.io.File;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;
 

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.ModelAttribute;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.multipart.MultipartFile;
 
@Controller

public class CrunchifyFileUploadController {
 

    @RequestMapping(value = "/upload", method = RequestMethod.GET)

    public String crunchifyDisplayForm() {

        return "uploadfile";

    }
 

    @RequestMapping(value = "/savefiles", method = RequestMethod.POST)

    public String crunchifySave(

            @ModelAttribute("uploadForm") CrunchifyFileUpload uploadForm,

            Model map) throws IllegalStateException, IOException {

        String saveDirectory = "c:/crunchify/";
 

        List<MultipartFile> crunchifyFiles = uploadForm.getFiles();
 

        List<String> fileNames = new ArrayList<String>();
 

        if (null != crunchifyFiles && crunchifyFiles.size() > 0) {

            for (MultipartFile multipartFile : crunchifyFiles) {
 

                String fileName = multipartFile.getOriginalFilename();

                if (!"".equalsIgnoreCase(fileName)) {

                    // Handle file content - multipartFile.getInputStream()

                    multipartFile

                            .transferTo(new File(saveDirectory + fileName));

                    fileNames.add(fileName);

                }

            }

        }
 

        map.addAttribute("files", fileNames);

        return "uploadfilesuccess";

    }
}

Step3: Model – Form Object

Create a Java bean which acts as Model/Form object for our Spring application. This bean contains a List of org.springframework.web.multipart.MultipartFile objects. Spring framework provides a useful class MultipartFile which can be used to fetch the file content of uploaded file. Apart from its content, the MultipartFile object also gives you other useful information such as filename, file size etc.

CrunchifyFileUpload.javaJava

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package com.crunchify.form;
 

import java.util.List;

import org.springframework.web.multipart.MultipartFile;
 

public class CrunchifyFileUpload {
 

    private List<MultipartFile> crunchifyFiles;
 

    public List<MultipartFile> getFiles() {

        return crunchifyFiles;

    }
 

    public void setFiles(List<MultipartFile> files) {

        this.crunchifyFiles = files;

    }
}

Step4: JSP Views

Now create the view pages for this application. We will need two JSPs, one to display file upload form and another to show result on successful upload.

The uploadfile.jsp displays a form with file input. Apart from this we have added small jquery snippetonclick of Add button. This will add a new file input component at the end of form. This allows user toupload as many files as they want.

Note that we have set enctype=”multipart/form-data” attribute of our <form> tag.

uploadfile.jsp

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<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>

<html>

<head>

<title>Crunchify - Spring MVC Upload Multiple Files Example</title>
<script

    src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
<script>

    $(document)

            .ready(

                    function() {

                        //add more file components if Add is clicked

                        $('#addFile')

                                .click(

                                        function() {

                                            var fileIndex = $('#fileTable tr')

                                                    .children().length - 1;

                                            $('#fileTable')

                                                    .append(

                                                            '<tr><td>'

                                                                    + '   <input type="file" name="files['+ fileIndex +']" />'

                                                                    + '</td></tr>');

                                        });
 

                    });
</script>

<style type="text/css">

body {

    background-image:

        url('http://cdn3.crunchify.com/wp-content/uploads/2013/03/Crunchify.bg_.300.png');
}
</style>

</head>

<body>

    <br>

    <br>

    <div align="center">

        <h1>Crunchify - Spring MVC Upload Multiple Files Example</h1>
 

        <form:form method="post" action="savefiles.html"

            modelAttribute="uploadForm" enctype="multipart/form-data">
 

            <p>Select files to upload. Press Add button to add more file

                inputs.</p>
 

            <table id="fileTable">

                <tr>

                    <td><input name="files[0]" type="file" /></td>

                </tr>

                <tr>

                    <td><input name="files[1]" type="file" /></td>

                </tr>

            </table>

            <br />

            <input type="submit" value="Upload" />

            <input id="addFile" type="button" value="Add File" />

        </form:form>
 

        <br />

    </div>

</body>

</html>

uploadfilesuccess.jsp

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<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

<html>

<head>

<title>Crunchify - Upload Multiple Files Example</title>

<style type="text/css">

body {

    background-image:

        url('http://cdn3.crunchify.com/wp-content/uploads/2013/03/Crunchify.bg_.300.png');
}
</style>

</head>

<body>

    <br>

    <br>

    <div align="center">
 

        <h1>Crunchify - Spring MVC Upload Multiple Files Example</h1>

        <p>Awesome.. Following files are uploaded successfully.</p>

        <ol>

            <c:forEach items="${files}" var="file">

           - ${file} <br>

            </c:forEach>

        </ol>

        <a href="http://localhost:8080/CrunchifySpringMVC3.2.1/upload.html"><input

            type="button" value="Go Back" /></a> <br />

        <br />

        <br />

        <div

            style="font-family: verdana; line-height: 25px; padding: 5px 10px; border-radius: 10px; border: 1px dotted #A4A4A4; width: 50%; font-size: 12px;">
 

            Spring MVC Upload Multiple Files Example by <a

                href='http://crunchify.com'>Crunchify</a>. Click <a

                href='http://crunchify.com/category/java-web-development-tutorial/'>here</a>

            for all Java, Spring MVC, Web Development examples.<br>

        </div>

    </div>

</body>

</html>

Step5: Update Spring Configuration

Add below bean to crunchify-servlet.xml file, just above <beanid="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver"> line.

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<bean id="multipartResolver"

        class="org.springframework.web.multipart.commons.CommonsMultipartResolver" />

Step6: Checkout Result

Start tomcat and point your browser to this URL: http://localhost:8080/CrunchifySpringMVC3.2.1/upload.html and you should see screen similar tothis.

Spring MVC 怎么上传多个文件到指定位置

After file upload you will see success message like this. You can always beautify your .jsp file the wayyou want.

Spring MVC 怎么上传多个文件到指定位置

List of all Spring MVC Examples, Java Examples.

About Crunchify

Hello & Good Day from greater New York. Crunchify is founded by App Shah. He is a professional blogger & loves Web development hence Crunchify.com is his publication with more than 10 millions pageviews per month, that covers all aspects and tactics on Java, WordPress, J2EE (Enterprise Java), Spring MVC, Github, etc Technologies.

Spring MVC 怎么上传多个文件到指定位置

Now let’s get started:

Step1: Pre-Requisite:

Maven Dependencies:

Step2: SpringController

Step3: Model – Form Object

Step4: JSP Views

Step5: Update Spring Configuration

Step6: Checkout Result

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