SpringMVC中的文件上传-蒲公英云

这是用的是SpringMVC-4.x、commons-fileupload-1.2.2和io-2.0.1

首先是web.xml

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<?**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**>

接下来是SpringMVC的配置文件upload-servlet.xml

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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: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**>
<**bean id=”multipartResolver” class=”org.springframework.web.multipart.commons.CommonsMultipartResolver”>**
<**property name=”defaultEncoding” value=”UTF-8”/>**
<**property name=”maxUploadSize” value=”200000”/>**
</**bean**>
<**bean id=”exceptionResolver” class=”org.springframework.web.servlet.handler.SimpleMappingExceptionResolver”>**
<**property name=”exceptionMappings”>**
<**props**>
<**prop key=”org.springframework.web.multipart.MaxUploadSizeExceededException”>error_fileupload</prop>**
</**props**>
</**property**>
</**bean**>
</**beans**>

下面是用于上传的表单页面//WEB-INF//jsp//user//add.jsp

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<%@ 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**>

下面是上传成功后打印用户信息的页面//WEB-INF//jsp//user//list.jsp

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<%@ 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}
<**a href=”<%=request.getContextPath()%>/user/${user.value.username}“>查看</a>**
<**a href=”<%=request.getContextPath()%>/user/${user.value.username}/update”>编辑</a>**
<**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>**

下面是上传文件内容过大时的提示页面//WEB-INF//jsp//error_fileupload.jsp

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

接下来是用到的实体类User.java

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package com.jadyer.model;
/**
* User
*/
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;
}
}

最后是核心的UserController.java

[java] view plain copy print ?

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
*/
@Controller
@RequestMapping(“/user”)
public class UserController {
private final static Map users = new HashMap();
//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”;
}
}