struts2文件下载

最新推荐文章于 2024-06-29 22:48:48 发布

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最新推荐文章于 2024-06-29 22:48:48 发布

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分类专栏： javaWeb

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新建包com.action，在包中新建类DownloadAction，类代码如下：

package com.action;

import java.io.InputStream;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class DownloadAction extends ActionSupport {

	private static final long serialVersionUID = 1L;
	private String path;
	public String getPath() {
		return path;
	}
	public void setPath(String path) {
		this.path = path;
	}
	public InputStream getDownloadFile() throws Exception{
		InputStream in=(InputStream) ServletActionContext.getServletContext().getResourceAsStream(getPath());
		return in;
	}
	@Override
	public String execute() throws Exception {
		// TODO Auto-generated method stub
		return SUCCESS;
	}
}

在src目录下新建struts.xml文件，代码如下：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
  <package name="Struts2_AJAX_DEMO" namespace="/" extends="struts-default">
        <action name="download" class="com.action.DownloadAction">
                        <param name="path">\download\a.jpg</param>
                    <result name="success" type="stream">
                             <!-- 下载文件类型定义 -->
                             <param name="contentType">image/jpg</param>
                             <!-- 下载文件处理方法 -->
                             <param name="contentDisposition">
              						attachment;filename="a.jpg"
                             </param>
                             <!-- 下载文件输出流定义 -->
                             <param name="inputName">downloadFile</param>
 							<param name="bufferSize">1024</param>
                    </result>
        </action>  
    </package>
</struts>

在WebContent/WEB-INF下新建web.xml文件，代码如下：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>internalDemo</display-name>
	<filter>
		<filter-name>struts2</filter-name>
		<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>struts2</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	<welcome-file-list>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>
</web-app>

在WebContent目录下新建index.jsp文件，代码如下：

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<!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>Insert title here</title>
</head>
<body>
	<center>
		<s:a action="download">download file</s:a>
	</center>
</body>
</html>

将待下载文件放在WebContent目录下。