‘初学’文件下载
Posted 杨荣林
tags:
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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="<%=basePath%>"> </head> <body> <a href="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="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;
}
}
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