jsp+servlet实现上载 _JavaScript

jsp+servlet实现下载
//servlet中代码:
package com.softeem.servlet;

import java.io.File;
import java.io.FileInputStream;

import java.io.IOException;
import java.io.OutputStream;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class DownLoadServlet extends HttpServlet{

/**
*
*/
private static final long serialVersionUID = 7366876186167835137L;

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String sourceName=request.getParameter("source");
File file=new File("d:\\TDDownload\\"+sourceName);
FileInputStream fis=new FileInputStream(file);

response.setContentType("application/force-download");
response.setHeader("content-length",String.valueOf(file.length()));
response.setHeader("Content-disposition","attachment;filename="+file.getName()+"");
OutputStream os=response.getOutputStream();
int length=0;
while((length=fis.read())!=-1){
os.write(length);
}
fis.close();
os.flush();
os.close();

}

}

//jsp中代码:
<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<%
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 'index.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">

</head>

<body>
    <a href="<%=path%>/downLoadServlet?source=Katong06.jpg"><img src="<%=path%>/images/love.JPG"/>点击这里下载</a><br>
    <a href="<%=path%>/downLoadServlet?source=Opera installer_ibis.exe"><img src="<%=path%>/images/kis.JPG"/>点击这里下载</a>
</body>
</html>

//web.xml中的代码:
<?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">
<servlet>
<servlet-name>downLoad</servlet-name>
<servlet-class>com.softeem.servlet.DownLoadServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>downLoad</servlet-name>
<url-pattern>/downLoadServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>