SpringMVC文件上传（转）_JAVA_编程开发_程序员俱乐部

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

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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>?

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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>?

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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>?

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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>?

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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>?

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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;?
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import javax.servlet.http.HttpServletRequest;?
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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";?
??? }?
}

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