文件上传<springmvc>

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
 5 http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
 6 <display-name></display-name>
 7 <welcome-file-list>
 8 <welcome-file>index.jsp</welcome-file>
 9 </welcome-file-list>
10 
11 <!-- springmvc前端控制器 -->
12 <servlet>
13 <servlet-name>springmvc</servlet-name>
14 <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
15 <!-- contextConfigLocation配置springmvc加载的配置文件（配置处理器映射器、适配器等等） -->
16 <!-- 如果不配置contextConfigLocation，默认加载的是/WEB-INF/servlet名称-serlvet.xml（springmvc-servlet.xml） -->
17 
18 <init-param>
19 <param-name>contextConfigLocation</param-name>
20 <param-value>classpath:springmvc.xml</param-value>
21 </init-param>
22 </servlet>
23 
24 <servlet-mapping>
25 <servlet-name>springmvc</servlet-name>
26 <!-- 第一种：*.action，访问以.action结尾 由DispatcherServlet进行解析 -->
27 <!-- 第二种：/，所以访问的地址都由DispatcherServlet进行解析，对于静态文件的解析需要配置不让DispatcherServlet进行解析 -->
28 <!-- 使用此种方式可以实现 RESTful风格的url -->
29 <!-- 第三种：/*，这样配置不对，使用这种配置，最终要转发到一个jsp页面时， -->
30 <!-- 仍然会由DispatcherServlet解析jsp地址，不能根据jsp页面找到handler，会报错。 -->
31 
32 <url-pattern>*.action</url-pattern>
33 </servlet-mapping>
34 
35 <filter>
36 <filter-name>SpringCharacterEncodingFilter</filter-name>
37 <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
38 <init-param>
39 <param-name>encoding</param-name>
40 <param-value>UTF-8</param-value>
41 </init-param>
42 </filter>
43 <filter-mapping>
44 <filter-name>SpringCharacterEncodingFilter</filter-name>
45 <url-pattern>/*</url-pattern>
46 </filter-mapping>
47 
48 <welcome-file-list>
49 <welcome-file>index.html</welcome-file>
50 </welcome-file-list>
51 </web-app>

 1 <beans xmlns="http://www.springframework.org/schema/beans"
 2 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
 3 xmlns:context="http://www.springframework.org/schema/context"
 4 xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
 5 xsi:schemaLocation="http://www.springframework.org/schema/beans 
 6 http://www.springframework.org/schema/beans/spring-beans-3.2.xsd 
 7 http://www.springframework.org/schema/mvc 
 8 http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd 
 9 http://www.springframework.org/schema/context 
10 http://www.springframework.org/schema/context/spring-context-3.2.xsd 
11 http://www.springframework.org/schema/aop 
12 http://www.springframework.org/schema/aop/spring-aop-3.2.xsd 
13 http://www.springframework.org/schema/tx 
14 http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">
15 
16  
17 
18 <!-- 对于注解的Handler可以单个配置 实际开发中建议使用组件扫描 -->
19 <!-- <bean class="cn.demo.controller.ParamController" /> -->
20 <!-- 可以扫描controller、service、... 这里让扫描controller，指定controller的包 -->
21 <context:component-scan base-package="cn.demo.controller"></context:component-scan>
22 
23 <!--spring3.1之后使用：注解映射器 -->
24 <!-- <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/> -->
25 <!--spring3.1之后使用：注解适配器 -->
26 <!-- <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/> -->
27 
28 <!-- 使用 mvc:annotation-driven代替上边注解映射器和注解适配器配置 -->
29 <!-- mvc:annotation-driven默认加载很多的参数绑定方法， -->
30 <!-- 比如json转换解析器就默认加载了，如果使用mvc:annotation-driven不用配置上边的RequestMappingHandlerMapping和RequestMappingHandlerAdapter -->
31 <!-- 实际开发时使用mvc:annotation-driven -->
32 
33 <mvc:annotation-driven />
34 
35 
36 <!-- 视图解析器 -->
37 <!-- 解析jsp解析，默认使用jstl标签，classpath下的得有jstl的包 -->
38 <bean
39 class="org.springframework.web.servlet.view.InternalResourceViewResolver">
40 <!-- 配置jsp路径的前缀 -->
41 <property name="prefix" value="/WEB-INF/jsp/" />
42 <!-- 配置jsp路径的后缀 -->
43 <property name="suffix" value=".jsp" />
44 </bean>
45 
46 
47 <!-- SpringMVC上传文件时，需要配置MultipartResolver处理器 -->
48 <bean id="multipartResolver"
49 class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
50 <property name="defaultEncoding" value="UTF-8" />
51 <!-- 指定所上传文件的总大小不能超过20000KB。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 -->
52 <property name="maxUploadSize" value="20000000" />
53 </bean>
54 
55 <!-- SpringMVC在超出上传文件限制时，会抛出org.springframework.web.multipart.MaxUploadSizeExceededException -->
56 <!-- 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 -->
57 <bean id="exceptionResolver"
58 class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
59 <property name="exceptionMappings">
60 <props>
61 <!-- 遇到MaxUploadSizeExceededException异常时，自动跳转到/WEB-INF/jsp/error_fileupload.jsp页面 -->
62 <prop
63 key="org.springframework.web.multipart.MaxUploadSizeExceededException">error_fileupload</prop>
64 </props>
65 </property>
66 </bean>
67 
68 </beans>

 1 package cn.demo.po;
 2 
 3  
 4 
 5 public class User {
 6 
 7  
 8 
 9 public User() {
10 
11  
12 
13 }
14 
15  
16 
17 public User(String username, String nickname, String password, String email) {
18 super();
19 this.username = username;
20 this.nickname = nickname;
21 this.password = password;
22 this.email = email;
23 }
24 
25  
26 
27 private String username;
28 private String nickname;
29 private String password;
30 private String email;
31 
32  
33 
34 public String getUsername() {
35 return username;
36 }
37 
38  
39 
40 public void setUsername(String username) {
41 this.username = username;
42 }
43 
44  
45 
46 public String getNickname() {
47 return nickname;
48 }
49 
50  
51 
52 public void setNickname(String nickname) {
53 this.nickname = nickname;
54 }
55 
56  
57 
58 public String getPassword() {
59 return password;
60 }
61 
62  
63 
64 public void setPassword(String password) {
65 this.password = password;
66 }
67 
68  
69 
70 public String getEmail() {
71 return email;
72 }
73 
74  
75 
76 public void setEmail(String email) {
77 this.email = email;
78 }
79 
80  
81 
82 }

 1 package cn.demo.controller;
 2 
 3 import java.io.File;
 4 import java.io.IOException;
 5 import java.util.HashMap;
 6 import java.util.Map;
 7 
 8 import javax.servlet.http.HttpServletRequest;
 9 
10 import org.apache.commons.io.FileUtils;
11 import org.springframework.stereotype.Controller;
12 import org.springframework.ui.Model;
13 import org.springframework.web.bind.annotation.RequestMapping;
14 import org.springframework.web.bind.annotation.RequestMethod;
15 import org.springframework.web.bind.annotation.RequestParam;
16 import org.springframework.web.multipart.MultipartFile;
17 import cn.demo.po.User;
18 
19 /**
20 * SpringMVC中的文件上传
21 * 
22 * @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
23 * @see 这里用到的是commons-fileupload-1.3.1.jar和commons-io-2.4.jar
24 * @see 第二步：在springmvc.xml中配置MultipartResolver处理器。可在此加入对上传文件的属性限制
25 * @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
26 * @see 第四步：编写前台表单。注意enctype="multipart/form-data"以及<input type="file"
27 * name="****"/>不对字符编码。 在使用包含文件上传控件的表单时，必须使用该值。
28 * @author tinyseven
29 */
30 @Controller
31 @RequestMapping("/user")
32 public class UserController {
33 private final static Map<String, User> users = new HashMap<String, User>();
34 
35 // 模拟数据源,构造初始数据
36 public UserController() {
37 users.put("AAAA", new User("AAAA", "AAAA", "133569856", "AAAA@yeah.net"));
38 users.put("BBBB", new User("BBBB", "BBBB", "154699856", "BBBB@gulong.cn"));
39 users.put("CCCC", new User("CCCC", "CCCC", "154896965", "CCCC@manhuang.cc"));
40 users.put("DDDD", new User("DDDD", "DDDD", "177654646", "DDDD@xiyouji.zh"));
41 }
42 
43 @RequestMapping("/list")
44 public String list(Model model, HttpServletRequest request) {
45 model.addAttribute("users", users);
46 // request.setAttribute("users", users);
47 return "user/list";
48 }
49 
50 @RequestMapping(value = "/add", method = RequestMethod.GET)
51 public String addUser() {
52 return "user/add";
53 }
54 
55 @RequestMapping(value = "/add", method = RequestMethod.POST)
56 public String addUser(User user, @RequestParam MultipartFile[] myfiles, HttpServletRequest request) throws IOException {
57 // 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
58 // 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
59 // 并且上传多个文件时，前台表单中的所有<input
60 // 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
61 for (MultipartFile myfile : myfiles) {
62 if (myfile.isEmpty()) {
63 System.out.println("未上传文件");
64 } else {
65 System.out.println("文件长度: " + myfile.getSize());
66 System.out.println("文件类型: " + myfile.getContentType());
67 System.out.println("文件名称: " + myfile.getName());
68 System.out.println("文件原名: " + myfile.getOriginalFilename());
69 System.out.println("========================================");
70 // 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
71 String realPath = request.getSession().getServletContext().getRealPath("/WEB-INF/upload");
72 // 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
73 FileUtils.copyInputStreamToFile(myfile.getInputStream(), new File(realPath, myfile.getOriginalFilename()));
74 }
75 }
76 users.put(user.getUsername(), user);
77 return "redirect:/user/list.action";
78 }
79 }

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<html>
<head>
<base href="<%=basePath%>">
<title>adduser</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0"> 
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
</head>
<body>
<form action="<%=request.getContextPath()%>/user/add.action" 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> 
</body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>
<html>
<head>
<base href="<%=basePath%>">
<title>list</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
</head>
<body>
<c:forEach var="user" items="${users}">
<p>${user.value.username}----${user.value.nickname}----${user.value.password}----${user.value.email}</p>
<br />
</c:forEach>
<br />
<a href="<%=request.getContextPath()%>/user/add.action">继续添加用户</a>
</body>
</html>