Struts2完成文件的下载

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Struts2完成文件的下载

10级学员郞志宋利兴课堂笔记

第一步：

编写jsp页面添加下载的超链接

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%@ taglib prefix="s" uri="/struts-tags" %><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">    <title>My JSP 'down.jsp' starting page</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">    <!--    <link rel="stylesheet" type="text/css" href="styles.css">    -->  </head>  <body>    <h1>文件下载</h1>    <!-- 下载链接 -->    <s:a action="down.action">download</s:a>  </body></html>

第二步：编写下载文件的Action文件

package cn.csdn.hr.up.action;import java.io.InputStream;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class DownAction extends ActionSupport {     private static final long serialVersionUID = 1L;    private String inputPath;    public String getInputPath() {        return inputPath;    }    public void setInputPath(String inputPath) {        this.inputPath = inputPath;    }    /*     * 下载用的Action应该返回一个InputStream实例，该方法对应在result里的inputName属性为     * getDownloadFile     */    public InputStream getDownloadFile()    {        return ServletActionContext.getServletContext().getResourceAsStream(        "/upload/Struts2.ppt");    }    @Override    public String execute() throws Exception    {        return SUCCESS;    }}

第三步：

在struts2配置文件中定义action文件

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts PUBLIC    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"    "http://struts.apache.org/dtds/struts-2.3.dtd"><struts>    <package name="down" extends="struts-default">        <action name="down" class="cn.csdn.hr.up.action.DownAction">            <!-- 配置结果类型为stream的结果 -->            <result name="success" type="stream">                <!-- 指定被下载文件的文件类型 -->                <param name="contentType">application/vnd.ms-powerpoint</param>                <!-- 指定下载文件的文件位置 -->                <param name="contentDisposition">filename="Struts2.ppt"</param>                <param name="inputName">downloadFile</param>            </result>        </action>    </package>  </struts>

测试点击download链接

会弹出下载窗口：