struts2实现文件下载

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一、struts2实现文件下载，首先应该在根目录下建立文件夹，以存放下载的文件（图片、war等）

二、代码：

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>登录界面</title></head><body> <center>    ${tip}    <form action="login.action" method="post">      <table>        <tr>          <td>用户名：</td>          <td><input type="text" name="username"/></td>        </tr>        <tr>          <td>密码：</td>          <td><input type="text" name="password"/></td>        </tr>        <tr>         <td colspan="2"><input type="submit" value="登录"/></td>         <td><a href="regist.jsp">还没有账号</a></td>         <td><a href="upload.jsp">上传文件</a><br/>        </tr>        <tr>        <td><a href="download.jsp">文件下载</a></td>        </tr>      </table>    </form> </center></body></html>

download.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>文件下载</title></head><body>  <ul>   <li>   <img style="height:200px;width:200px" src="download/1312.jpg" />   </li>   <li>    <a href="download.action">下载此张照片：</a>   </li>   </ul>  </body></html>

FileDownloadAction.java

package com.action;import java.io.InputStream;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class FileDownloadAction extends ActionSupport {   private String inputPath;   public void  setInputPath(String value){   inputPath=value;   }   public InputStream getTargetFile() throws Exception{  return ServletActionContext.getServletContext().getResourceAsStream(inputPath);   }}

struts.xml

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN" "http://struts.apache.org/dtds/struts-2.5.dtd" ><struts>   <package name="myPackage" namespace="/" extends="struts-default">   <action name="login" class="com.action.UserAction" method="execute">            <result>loginSuccess.jsp</result>            <result name="input">login.jsp</result>        </action>        <action name="upload" class="com.action.FileAction" method="upload">        <param name="savePath">/uploadFiles</param><!--配置文件中出现的保存文件的路径为uploadFiles，故应该在根目录下建立这样的一个文件夹 -->        <result name="success">/uploadSucc.jsp</result>       </action>       <action name="download" class="com.action.FileDownloadAction">         <param name="inputPath">\download\1312.jpg</param>          <result name="success" type="stream">           <param name="contentType">application/jpg</param>           <param name="inputName">targetFile</param>           <param name="contentDisposition">filename="1312.jpg"</param>           <param name="bufferSize">4096</param>           </result>       </action>    </package></struts>

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