SpringMVC中的文件上传

<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <servlet> <servlet-name>upload</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>upload</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <filter> <filter-name>SpringCharacterEncodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>SpringCharacterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <welcome-file-list> <welcome-file>/WEB-INF/jsp/user/add.jsp</welcome-file> </welcome-file-list> </web-app>

<?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:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="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-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"> <context:component-scan base-package="com.jadyer"/> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> <!-- SpringMVC上传文件时，需要配置MultipartResolver处理器 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="defaultEncoding" value="UTF-8"/> <!-- 指定所上传文件的总大小不能超过200KB。注意maxUploadSize属性的限制不是针对单个文件，而是所有文件的容量之和 --> <property name="maxUploadSize" value="200000"/> </bean> <!-- SpringMVC在超出上传文件限制时，会抛出org.springframework.web.multipart.MaxUploadSizeExceededException --> <!-- 该异常是SpringMVC在检查上传的文件信息时抛出来的，而且此时还没有进入到Controller方法中 --> <bean id="exceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver"> <property name="exceptionMappings"> <props> <!-- 遇到MaxUploadSizeExceededException异常时，自动跳转到/WEB-INF/jsp/error_fileupload.jsp页面 --> <prop key="org.springframework.web.multipart.MaxUploadSizeExceededException">error_fileupload</prop> </props> </property> </bean> </beans>

<%@ page language="java" pageEncoding="UTF-8"%> <form action="<%=request.getContextPath()%>/user/add" method="POST" enctype="multipart/form-data"> username: <input type="text" name="username"/><br/> nickname: <input type="text" name="nickname"/><br/> password: <input type="password" name="password"/><br/> yourmail: <input type="text" name="email"/><br/> yourfile: <input type="file" name="myfiles"/><br/> yourfile: <input type="file" name="myfiles"/><br/> yourfile: <input type="file" name="myfiles"/><br/> <input type="submit" value="添加新用户"/> </form>

<%@ page language="java" pageEncoding="UTF-8"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <c:forEach items="${users}" var="user"> ${user.value.username}----${user.value.nickname}----${user.value.password}----${user.value.email} &nbsp;&nbsp;&nbsp;&nbsp;<a href="<%=request.getContextPath()%>/user/${user.value.username}">查看</a> &nbsp;&nbsp;&nbsp;&nbsp;<a href="<%=request.getContextPath()%>/user/${user.value.username}/update">编辑</a> &nbsp;&nbsp;&nbsp;&nbsp;<a href="<%=request.getContextPath()%>/user/${user.value.username}/delete">删除</a> <br/> </c:forEach> <br/> <a href="<%=request.getContextPath()%>/user/add">继续添加用户</a>

<%@ page language="java" pageEncoding="UTF-8"%> <h1>文件过大，请重新选择</h1>

package com.jadyer.model; /** * User * @author 宏宇 * @create May 12, 2012 1:24:43 AM */ public class User { private String username; private String nickname; private String password; private String email; /*==四个属性的getter()、setter()略==*/ public User() {} public User(String username, String nickname, String password, String email) { this.username = username; this.nickname = nickname; this.password = password; this.email = email; } }

package com.jadyer.controller; import java.io.File; import java.io.IOException; import java.util.HashMap; import java.util.Map; import javax.servlet.http.HttpServletRequest; import org.apache.commons.io.FileUtils; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.MultipartFile; import com.jadyer.model.User; /** * SpringMVC中的文件上传 * @see 第一步：由于SpringMVC使用的是commons-fileupload实现，故将其组件引入项目中 * @see 这里用到的是commons-fileupload-1.2.2.jar和commons-io-2.0.1.jar * @see 第二步：在####-servlet.xml中配置MultipartResolver处理器。可在此加入对上传文件的属性限制 * @see 第三步：在Controller的方法中添加MultipartFile参数。该参数用于接收表单中file组件的内容 * @see 第四步：编写前台表单。注意enctype="multipart/form-data"以及<input type="file" name="****"/> * @author 宏宇 * @create May 12, 2012 1:26:21 AM */ @Controller @RequestMapping("/user") public class UserController { private final static Map<String,User> users = new HashMap<String,User>(); //模拟数据源,构造初始数据 public UserController(){ users.put("张起灵", new User("张起灵", "闷油瓶", "02200059", "menyouping@yeah.net")); users.put("李寻欢", new User("李寻欢", "李探花", "08866659", "lixunhuan@gulong.cn")); users.put("拓拔野", new User("拓拔野", "搜神记", "05577759", "tuobaye@manhuang.cc")); users.put("孙悟空", new User("孙悟空", "美猴王", "03311159", "sunhouzi@xiyouji.zh")); } @RequestMapping("/list") public String list(Model model){ model.addAttribute("users", users); return "user/list"; } @RequestMapping(value="/add", method=RequestMethod.GET) public String addUser(){ return "user/add"; } @RequestMapping(value="/add", method=RequestMethod.POST) public String addUser(User user, @RequestParam MultipartFile[] myfiles, HttpServletRequest request) throws IOException{ //如果只是上传一个文件，则只需要MultipartFile类型接收文件即可，而且无需显式指定@RequestParam注解 //如果想上传多个文件，那么这里就要用MultipartFile[]类型来接收文件，并且还要指定@RequestParam注解 //并且上传多个文件时，前台表单中的所有<input type="file"/>的name都应该是myfiles，否则参数里的myfiles无法获取到所有上传的文件 for(MultipartFile myfile : myfiles){ if(myfile.isEmpty()){ System.out.println("文件未上传"); }else{ System.out.println("文件长度: " + myfile.getSize()); System.out.println("文件类型: " + myfile.getContentType()); System.out.println("文件名称: " + myfile.getName()); System.out.println("文件原名: " + myfile.getOriginalFilename()); System.out.println("========================================"); //如果用的是Tomcat服务器，则文件会上传到\\%TOMCAT_HOME%\\webapps\\YourWebProject\\WEB-INF\\upload\\文件夹中 String realPath = request.getSession().getServletContext().getRealPath("/WEB-INF/upload"); //这里不必处理IO流关闭的问题，因为FileUtils.copyInputStreamToFile()方法内部会自动把用到的IO流关掉，我是看它的源码才知道的 FileUtils.copyInputStreamToFile(myfile.getInputStream(), new File(realPath, myfile.getOriginalFilename())); } } users.put(user.getUsername(), user); return "redirect:/user/list"; } }