SpringMVC文件上传（转）

这是用的是SpringMVC-3.1.1、commons-fileupload-1.2.2和io-2.0.1

 

首先是web.xml
[html] <?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
[html]
<?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"/> 
     
    <mvc:annotation-driven/> 
     
    <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"> 
        <!-- 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> 

 

下面是用于上传的表单页面//WEB-INF//jsp//user//add.jsp
[html]
<%@ 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
[html]
<%@ 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
[html]
<%@ 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
[java]
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; 
    } 
} 

最后是核心的UserController.java
[java]
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", "[e-mail]")); 
        users.put("李寻欢", new User("李寻欢", "李探花", "08866659", "[e-mail]")); 
        users.put("拓拔野", new User("拓拔野", "搜神记", "05577759", "[e-mail]")); 
        users.put("孙悟空", new User("孙悟空", "美猴王", "03311159", "[e-mail]")); 
    } 
     
    @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"; 
    } 
}

 

 

转自：http://www.2cto.com/kf/201205/132043.html