struts2上传图片的全过程 2 不定多个上传
转载自：http://www.cnblogs.com/CheeseZH/archive/2013/03/05/2943899.html
项目整体目录结构
1、搭建Struts2框架
（1）导入Struts2相关jar包
（2）配置web.xml文件
1 <?xml version="1.0" encoding="UTF-8"?> 2 <web-app version="2.5" 3 xmlns="http://java.sun.com/xml/ns/javaee" 4 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 5 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 6 http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> 7 8 <filter> 9 <filter-name>struts2</filter-name>10 <filter-class>11 org.apache.struts2.dispatcher.FilterDispatcher12 </filter-class>13 </filter>14 15 <filter-mapping>16 <filter-name>struts2</filter-name>17 <url-pattern>/*</url-pattern>18 </filter-mapping>19 <welcome-file-list>20 <welcome-file>index.jsp</welcome-file>21 </welcome-file-list>22 </web-app>
（3）配置struts.xml文件
1 <?xml version="1.0" encoding="UTF-8" ?> 2 <!DOCTYPE struts PUBLIC 3 "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" 4 "http://struts.apache.org/dtds/struts-2.0.dtd"> 5 6 <struts> 7 8 <constant name="struts.custom.i18n.resources" value="message" /> 9 10 <constant name="struts.i18n.encoding" value="gbk"></constant>11 12 <!-- 上传过程中临时文件存放目录 -->13 <constant name="struts.multipart.saveDir" value="c:\"></constant>14 15 <package name="struts2" extends="struts-default">16 17 <action name="upload"18 class="com.broadengate.struts.UploadAction">19 <result name="success">/uploadResult.jsp</result>20 <result name="input">/index.jsp</result>21 <!-- 定义文件上传拦截器 -->22 <interceptor-ref name="fileUpload">23 <!-- 设置文件上传大小 -->24 <param name="maximumSize">409600</param>25 <!-- 设置文件上传类型 26 <param name="allowedTypes">27 application/vnd.ms-powerpoint28 </param>29 -->30 </interceptor-ref>31 <!-- 自定义了拦截器后必手动定义默认的拦截器，否则默认的拦截器不会被执行 -->32 <interceptor-ref name="defaultStack"></interceptor-ref>33 </action>34 35 </package>36 37 </struts>
2、index.jsp上传功能页面代码
要注意第6行，引入了struts2的tags的uri，否则tomcat不认识<s:...>标签
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6 <%@ taglib prefix="s" uri="/struts-tags"%> 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 8 <html> 9 <head>10 <base href="<%=basePath%>">11 12 <title>My JSP 'index.jsp' starting page</title>13 <meta http-equiv="pragma" content="no-cache">14 <meta http-equiv="cache-control" content="no-cache">15 <meta http-equiv="expires" content="0">
16 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">17 <meta http-equiv="description" content="This is my page">18 <!--19 <link rel="stylesheet" type="text/css" href="styles.css">20 -->21 </head>22 23 <body>24 25 <s:form action="upload" theme="simple" enctype="multipart/form-data">26 <table align="center" width="50%" border="1">27 <tr>28 <td>username</td>29 <td><s:textfield name="username"></s:textfield></td>30 </tr>31 <tr>32 <td>password</td>33 <td><s:password name="password"></s:password></td>34 </tr>35 <tr>36 <td>file</td>37 <td id="more">38 <s:file name="file"></s:file>39 <input type="button" value="Add More.." onclick="addMore()">40 </td>41 </tr>42 <tr>43 <td><s:submit value=" submit "></s:submit></td>44 <td><s:reset value=" reset "></s:reset></td>45 </tr>46 </table>47 </s:form>48 </body>49 <script type="text/javascript">
50 function addMore()51 {52 var td = document.getElementById("more");53 54 var br = document.createElement("br");55 var input = document.createElement("input");56 var button = document.createElement("input");57 58 input.type = "file";59 input.name = "file";60 61 button.type = "button";62 button.value = "Remove";63 64 button.onclick = function()65 {66 td.removeChild(br);67 td.removeChild(input);68 td.removeChild(button);69 }70 td.appendChild(br);71 td.appendChild(input);72 td.appendChild(button);73 }74 </script>75 </html>
3、UploadAction.java，在struts.xml中配置的用于响应index.jsp页面中form的action属性的对应类
1 package com.broadengate.struts; 2 3 import java.io.File; 4 import java.io.FileInputStream; 5 import java.io.FileOutputStream; 6 import java.io.InputStream; 7 import java.io.OutputStream; 8 import java.util.ArrayList; 9 import java.util.List; 10 11 import org.apache.struts2.ServletActionContext; 12 13 import com.opensymphony.xwork2.ActionSupport; 14 15 public class UploadAction extends ActionSupport { 16 private String username; 17 18 private String password; 19 20 private List<File> file; 21 22 private List<String> fileFileName; 23 24 private List<String> fileContentType; 25 26 private List<String> dataUrl; 27 28 29 @Override 30 public String execute() throws Exception { 31 dataUrl = new ArrayList<String>(); 32 // ・ 33 String imgpath = "upload/"; 34 for (int i = 0; i < file.size(); ++i) { 35 InputStream is = new FileInputStream(file.get(i)); 36 37 String path = ServletActionContext.getServletContext().getRealPath("/"); 38 System.out.println(path); 39 // String root = "D:\\"; 40 41 dataUrl.add(imgpath+this.getFileFileName().get(i)); 42 File destFile = new File(path+imgpath, this.getFileFileName().get(i)); 43 44 OutputStream os = new FileOutputStream(destFile); 45 46 byte[] buffer = new byte[400]; 47 48 int length = 0; 49 50 while ((length = is.read(buffer)) > 0) { 51 os.write(buffer, 0, length); 52 } 53 54 is.close(); 55 56 os.close(); 57 } 58 return SUCCESS; 59 } 60 61 62 63 64 public String getUsername() { 65 return username; 66 } 67 68 public void setUsername(String username) { 69 this.username = username; 70 } 71 72 public String getPassword() { 73 return password; 74 } 75 76 public List<String> getDataUrl() { 77 return dataUrl; 78 } 79 80 81 82 83 public void setDataUrl(List<String> dataUrl) { 84 this.dataUrl = dataUrl; 85 } 86 87 88 89 90 public void setPassword(String password) { 91 this.password = password; 92 } 93 94 public List<File> getFile() { 95 return file; 96 } 97 98 public void setFile(List<File> file) { 99 this.file = file;100 }101 102 public List<String> getFileFileName() {103 return fileFileName;104 }105 106 public void setFileFileName(List<String> fileFileName) {107 this.fileFileName = fileFileName;108 }109 110 public List<String> getFileContentType() {111 return fileContentType;112 }113 114 public void setFileContentType(List<String> fileContentType) {115 this.fileContentType = fileContentType;116 }117 }
4、显示上传结果页面uploadResult.jsp
1 <%@ page language="java" contentType="text/html; charset=GB18030" 2 pageEncoding="GB18030"%> 3 <% 4 String path = request.getContextPath(); 5 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 6 %>
7 <%@ taglib prefix="s" uri="/struts-tags" %> 8 9 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">10 <html>11 <head>12 <base href="<%=basePath%>">13 <meta http-equiv="Content-Type" content="text/html; charset=GB18030">14 <title>Insert title here</title>15 </head>16 <body>17 <%=basePath %>18 username: <s:property value="username"/><br>19 20 password: <s:property value="password"/><br>21 22 file: <s:property value="fileFileName"/>23 24 25 <s:iterator id="imgUrl" value="dataUrl">26 <br /><img src="${imgUrl}"/>27 </s:iterator>28 </body>29 </html>
5、我的Tomcat安装在D盘，要在“D:\Tomcat6.0\webapps\MyUpload”文件夹下新建一个upload文件夹，否则运行会报错，提示找不到路径，这个功能也可以在代码中添加。下边是运行效果：
（1）上传页面
（2）结果显示
ps：第一行的路径是写程序时做测试用的，没有实际意义。
