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‘初学’文件下载
文件下载
1.准备页面index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%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="http://www.mamicode.com/"> </head> <body> <a href="http://www.mamicode.com/download.action?fileName=12092-106.j31pg">点击此处下载文档</a> </body></html>
2.struts.xml中
<?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> <!-- 动态方法调用 --> <constant name="struts.devMode" value="http://www.mamicode.com/false" /> <package name="default" namespace="/" extends="struts-default"> <action name="download" class="cn.happy.action.FileDownAction" method="execute"> <param name="inputPath">/image</param> <result name="success" type="stream"> <param name="contentType">application/octet-stream</param> <param name="inputName">inputStream</param> <param name="ContentDisposition"> attachment;filename="${fileName}" </param> <param name="bufferSize">4096</param> </result> </action> </package></struts>3.web.xml中
<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <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>
4.java类
package cn.happy.action;import java.io.BufferedInputStream;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.InputStream;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class FileDownAction extends ActionSupport { //读取下载文件的目录 private String inputPath; //下载文件的文件名 private String fileName; //读取下载文件的输入流 @SuppressWarnings("unused") private InputStream inputStream; //下载文件类型 private String conentType; @Override public String execute() throws Exception { return SUCCESS; } //创建inputStream输入流 public InputStream getInputStream() throws FileNotFoundException { String path=ServletActionContext.getServletContext().getRealPath(inputPath); return new BufferedInputStream(new FileInputStream(path+"\\"+fileName)); } public void setInputStream(InputStream inputStream) { this.inputStream = inputStream; } public String getInputPath() { return inputPath; } public void setInputPath(String inputPath) { this.inputPath = inputPath; } public String getFileName() { return fileName; } public void setFileName(String fileName) { this.fileName = fileName; } public String getConentType() { return conentType; } public void setConentType(String conentType) { this.conentType = conentType; } }再给你们配张图
‘初学’文件下载
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