SpringMVC single file upload, multi-File Upload, file list display, file download, springmvc File Upload

SpringMVC single file upload, multi-File Upload, file list display, file download, springmvc File Upload

Original works of Lin bingwen Evankaka. Reprinted please indicate the source http://blog.csdn.net/evankaka

This document describes in detail the single file upload, multi-File Upload, file list display, and file download of SpringMVC instances.

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1. Create a Web project and import related packages

Springmvc package + commons-fileupload.jar + connom-io.jar + commons-logging, jar + jstl. jar + standard. jar

The entire related package is as follows:

The project directory is as follows:

2. Configure the web. xml and SpringMVC files

(1) web. xml

<? 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" xmlns: web = "http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" 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"> <! -- Front-end controller of SpringMVC --> <servlet-name> MyDispatcher </servlet-name> <servlet-class> org. springframework. web. servlet. dispatcherServlet </servlet-class> <! -- Set your own Controller xml file --> <init-param> <param-name> contextConfigLocation </param-name> <param-value>/WEB-INF/springMVC-servlet.xml </param- value> </init-param> <load-on-startup> 1 </load-on-startup> </servlet> <! -- Spring MVC configuration file ended --> <! -- Intercept settings --> <servlet-mapping> <servlet-name> MyDispatcher </servlet-name> <! -- All requests are intercepted by SpringMVC --> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>

(2) springMVC-servlet.xml documents

<Beans xmlns = "http://www.springframework.org/schema/beans" xmlns: context = "http://www.springframework.org/schema/context" xmlns: util = "http://www.springframework.org/schema/util" xmlns: xsi = "http://www.w3.org/2001/XMLSchema-instance" xmlns: p = "http://www.springframework.org/schema/p" xmlns: mvc = "http://www.springframework.org/schema/mvc" xsi: schemaLocation = "http://www.springframework.org/schema/util http: // Www.springframework.org/schema/util/spring-util-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd. Org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd "> <! -- Convert the class marked with @ Controller annotation to bean --> <context: component-scan base-package = "com. mucfc"/> <! -- Resolve the Model View name, that is, add the prefix suffix --> <bean class = "org. springframework. web. servlet. view. internalResourceViewResolver "p: prefix ="/WEB-INF/views/"p: suffix = ". jsp "/> <! -- Set the file to be uploaded. maxUploadSize =-1 indicates infinity. UploadTempDir is the temporary directory for upload --> <bean id = "multipartResolver" class = "org. springframework. web. multipart. commons. commonsMultipartResolver "p: defaultEncoding =" UTF-8 "p: maxUploadSize =" 5400000 "p: uploadTempDir =" fileUpload/temp "/> </beans>

3. Upload a single file

(1) Controller

@ Controller @ RequestMapping ("/file") public class FileController {@ RequestMapping ("/toFile") public String toFileUpload () {return "fileUpload ";} @ RequestMapping ("/toFile2") public String toFileUpload2 () {return "fileUpload2";}/*** method 1 upload a file */@ RequestMapping ("/onefile ") public String oneFileUpload (@ RequestParam ("file") CommonsMultipartFile file, HttpServletRequest request, ModelMap model) {// obtain the original file name String FileName = file. getOriginalFilename (); System. out. println ("original file name:" + fileName); // new file name String newFileName = UUID. randomUUID () + fileName; // obtain the project path ServletContext SC = request. getSession (). getServletContext (); // upload location String path = SC. getRealPath ("/img") + "/"; // set the File storage directory File f = new File (path); if (! F. exists () f. mkdirs (); if (! File. isEmpty () {try {FileOutputStream fos = new FileOutputStream (path + newFileName); InputStream in = file. getInputStream (); int B = 0; while (B = in. read ())! =-1) {fos. write (B);} fos. close (); in. close ();} catch (Exception e) {e. printStackTrace () ;}} System. out. println ("Upload image to:" + path + newFileName); // save the file address for displaying the model on the JSP page. addAttribute ("fileUrl", path + newFileName); return "fileUpload";}/*** method 2 upload a file, one at a time */@ RequestMapping ("/onefile2 ") public String oneFileUpload2 (HttpServletRequest request, HttpServletResponse response) throws Exception {CommonsMultipartRes Olver cmr = new CommonsMultipartResolver (request. getServletContext (); if (cmr. isMultipart (request) {MultipartHttpServletRequest mRequest = (MultipartHttpServletRequest) (request); Iterator <String> files = mRequest. getFileNames (); while (files. hasNext () {MultipartFile mFile = mRequest. getFile (files. next (); if (mFile! = Null) {String fileName = UUID. randomUUID () + mFile. getOriginalFilename (); String path = "d:/upload/" + fileName; File localFile = new File (path); mFile. transferTo (localFile); request. setAttribute ("fileUrl", path) ;}} return "fileUpload ";}}

(2) JSP: This page is used for uploading and displaying the uploaded image page fileUpload. jsp

<% @ Page language = "java" contentType = "text/html; charset = UTF-8 "pageEncoding =" UTF-8 "%> <% @ taglib prefix =" form "uri =" http://www.springframework.org/tags/form "%> <% String path = request. getContextPath (); String basePath = request. getScheme () + ": //" + request. getServerName () + ":" + request. getServerPort () + path + "/"; %> <! DOCTYPE html PUBLIC "-// W3C // dtd html 4.01 Transitional // EN" "http://www.w3.org/TR/html4/loose.dtd"> 



Run now and check the effect. Enter http: // localhost: 8080/SpringMVCLearningChapter4_1/file/toFile.


Console output result, after selecting the image
Original file name: Chrysanthemum.jpg
Upload the image to: E: \ workspace \. metadata \. plugins \ org. eclipse. wst. server. core \ tmp0 \ wtpwebapps \ SpringMVCLearningChapter4_1 \ img/templates
The image has been uploaded and can be displayed in JSP.

Let's take a look at the server path: E: \ workspace \. metadata \. plugins \ org. eclipse. wst. server. core \ tmp0 \ wtpwebapps \ SpringMVCLearningChapter4_1 \ img

Indicates that the image has been uploaded to the server.

Method 2:
Upload using file stream

/*** Method 2: upload a file at a time */@ RequestMapping ("/onefile2") public String oneFileUpload2 (HttpServletRequest request, HttpServletResponse response) throws Exception {CommonsMultipartResolver cmr = new CommonsMultipartResolver (request. getServletContext (); if (cmr. isMultipart (request) {MultipartHttpServletRequest mRequest = (MultipartHttpServletRequest) (request); Iterator <String> files = mRequest. getFileNames (); While (files. hasNext () {MultipartFile mFile = mRequest. getFile (files. next (); if (mFile! = Null) {String fileName = UUID. randomUUID () + mFile. getOriginalFilename (); String path = "d:/upload/" + fileName; File localFile = new File (path); mFile. transferTo (localFile); request. setAttribute ("fileUrl", path) ;}} return "fileUpload ";}

Set
<Center> <form action = "file/onefile" method = "post" enctype = "multipart/form-data"> <input type = "file" name = "file "/> <input type = "submit" value = "Upload"/> </form> In
<form action="file/onefile"
Change


<form action="file/onefile2"
Input: http: // localhost: 8080/SpringMVCLearningChapter4_1/file/toFile



Method 2: Specify the upload folder uploaded to the local edisk

PAGE result

Iv. Multifile upload
(1) Controller

@RequestMapping("/toFile2")public String toFileUpload2() {return "fileUpload2";}


/*** Upload multiple images at a time */@ RequestMapping ("/threeFile") public String threeFileUpload (@ RequestParam ("file") CommonsMultipartFile files [], HttpServletRequest request, ModelMap model) {List <String> list = new ArrayList <String> (); // obtain the project path ServletContext SC = request. getSession (). getServletContext (); // upload location String path = SC. getRealPath ("/img") + "/"; // set the File storage directory File f = new File (path); if (! F. exists () f. mkdirs (); for (int I = 0; I <files. length; I ++) {// obtain the original file name String fileName = files [I]. getOriginalFilename (); System. out. println ("original file name:" + fileName); // new file name String newFileName = UUID. randomUUID () + fileName; if (! Files [I]. isEmpty () {try {FileOutputStream fos = new FileOutputStream (path + newFileName); InputStream in = files [I]. getInputStream (); int B = 0; while (B = in. read ())! =-1) {fos. write (B);} fos. close (); in. close ();} catch (Exception e) {e. printStackTrace () ;}} System. out. println ("Upload image to:" + path + newFileName); list. add (path + newFileName);} // save the file address for displaying the model on the JSP page. addAttribute ("fileList", list); return "fileUpload2 ";}
It is actually modified in method 1 of single file upload, but it is a loop.



(2) fileUpload2.jsp display page

<% @ Page language = "java" import = "java. util. * "contentType =" text/html; charset = UTF-8 "pageEncoding =" UTF-8 "%> <% @ taglib prefix =" form "uri =" http://www.springframework.org/tags/form "%> <% @ taglib uri =" http://java.sun.com/jsp/jstl/core "prefix =" c "%> <% String path = request. getContextPath (); String basePath = request. getScheme () + ": //" + request. getServerName () + ":" + request. getServerPort () + path + "/"; %> <! DOCTYPE html PUBLIC "-// W3C // dtd html 4.01 Transitional // EN" "http://www.w3.org/TR/html4/loose.dtd"> Note that this is used
</c:forEach>
Form, jstl. jar + standard. jar

(3) Enter http: // localhost: 8080/SpringMVCLearningChapter4_1/file/toFile2 after running (note that the preceding figure is not followed by the number 2 in a single file)

Select an image and Click Upload




Console output result:


The image cannot clearly read the text:
Original file name: Desert.jpg
Upload the image to: E: \ workspace \. metadata \. plugins \ org. eclipse. wst. server. core \ tmp0 \ wtpwebapps \ SpringMVCLearningChapter4_1 \ img/templates
Original file name: Hydrangeas.jpg
Upload the image to: E: \ workspace \. metadata \. plugins \ org. eclipse. wst. server. core \ tmp0 \ wtpwebapps \ SpringMVCLearningChapter4_1 \ img/templates
Original file name: Jellyfish.jpg
Upload the image to: E: \ workspace \. metadata \. plugins \ org. eclipse. wst. server. core \ tmp0 \ wtpwebapps \ SpringMVCLearningChapter4_1 \ img/dee340d8-9cc0-41ae-9959-f7fa47ff172bJellyfish.jpg
All three images can be displayed.



Let's look at the server. This is the three files that have just been uploaded.

5. Upload file list display
(1) Controller

/*** List all images */@ RequestMapping ("/listFile") public String listFile (HttpServletRequest request, HttpServletResponse response) {// obtain the directory of the uploaded file ServletContext SC = request. getSession (). getServletContext (); // upload location String uploadFilePath = SC. getRealPath ("/img") + "/"; // set the directory for saving the file // store the Map file name to be downloaded <String, String> fileNameMap = new HashMap <String, string> (); // recursively traverse all files and directories under the filepath directory, store the File names to listfile (new File (uploadFilePath), fileNameMap) in the map set ); // File can represent a File or a directory // send the Map set to listfile. the jsp page displays the request. setAttribute ("fileNameMap", fileNameMap); return "listFile ";}
(2) JSP file listFile. jsp


<% @ Page language = "java" import = "java. util. * "pageEncoding =" UTF-8 "%> <% @ taglib prefix =" c "uri =" http://java.sun.com/jsp/jstl/core "%> <! Doctype html> 

(3) Enter http: // localhost: 8080/SpringMVCLearningChapter4_1/file/listFile

These are the four images that have just been uploaded.

Vi. File Download
(1) Controller

@ RequestMapping ("/downFile") public void downFile (HttpServletRequest request, HttpServletResponse response) {System. out. println ("1"); // get the file name String fileName = request. getParameter ("filename"); System. out. println ("2"); try {fileName = new String (fileName. getBytes ("iso8859-1"), "UTF-8"); System. out. println ("3"); // obtain the directory of the uploaded file ServletContext SC = request. getSession (). getServletContext (); System. out. println ("4"); // upload location String fileSaveRootPath = SC. getRealPath ("/img"); System. out. println (fileSaveRootPath + "\" + fileName); // obtain the File to be downloaded. file = new File (fileSaveRootPath + "\" + fileName ); // if the object does not exist if (! File. exists () {request. setAttribute ("message", "The resource you want to download has been deleted !! "); System. out. println (" The resource you want to download has been deleted !! "); Return;} // processing file name String realname = fileName. substring (fileName. indexOf ("_") + 1); // sets the response header and controls the browser to download the file response. setHeader ("content-disposition", "attachment; filename =" + URLEncoder. encode (realname, "UTF-8"); // read the file to be downloaded and save it to the file input stream FileInputStream in = new FileInputStream (fileSaveRootPath + "\" + fileName ); // create output stream OutputStream out = response. getOutputStream (); // create a buffer byte buffer [] = new byte [1024]; int len = 0; // cyclically read the content in the input stream to the buffer while (len = in. read (buffer)> 0) {// output the buffer content to the browser to download the file out. write (buffer, 0, len);} // close the file input stream in. close (); // close the output stream out. close () ;}catch (Exception e ){}}

Here we download images through file streams.

Then you can select the download location.



I finally finished speaking. It took most of my time!
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Original works of Lin bingwen Evankaka. Reprinted please indicate the source http://blog.csdn.net/evankaka