Spring实现文件上传(示例代码)

在实际开发中，经常遇到要实现文件上传到服务器端的功能。Spring可以继承commons-fileupload插件来实现文件上传的功能。分为前端JSP编写和后台Controller的编写。

前期准备工作，首先要引入commons-fileupload这个jar包，pom.xml中的配置如下：
复制代码 代码如下:


 commons-fileupload
 commons-fileupload
 1.2.2


然后配置拦截器，在dispatcher-servlet.xml中添加
复制代码 代码如下:

 class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
 
 
  1048576
 


直接上代码：

1、前端JSP编写

upload.jsp
复制代码 代码如下:
<%@ page language="java" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>


 
  
 
 
  
 


2、后台UploadController编写
复制代码 代码如下:
package nju.software.xkxt.web.controller;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

@Controller
public class UploadController {

 
 @RequestMapping(value = "upload_enter.do", method = RequestMethod.GET)
 public String enter(HttpServletRequest request,
   HttpServletResponse response, ModelMap model) throws IOException {
  // 进入下载界面
  return "upload";

 }

 
 @RequestMapping(value = "upload.do", method = RequestMethod.POST)
 public void upload(HttpServletRequest request,
   HttpServletResponse response, ModelMap model) throws IOException {
  MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
  // 得到上传的文件
  MultipartFile mFile = multipartRequest.getFile("file");
  // 得到上传服务器的路径
  String path = request.getSession().getServletContext()
    .getRealPath("/WEB-INF/upload/");
  // 得到上传的文件的文件名
  String filename = mFile.getOriginalFilename();
  InputStream inputStream = mFile.getInputStream();
  byte[] b = new byte[1048576];
  int length = inputStream.read(b);
  path += "\" + filename;
  // 文件流写到服务器端
  FileOutputStream outputStream = new FileOutputStream(path);
  outputStream.write(b, 0, length);
  inputStream.close();
  outputStream.close();
 }
}

这样就很容易的实现了文件上传的功能。