Jsp 实现文件下载

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@page import="java.io.*"%>
<!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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<a href="loadFile2.jsp">download</a> 
</body>
</html>


<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@page import="java.io.*"%>
<!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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<%
	OutputStream o = response.getOutputStream();
	byte b[]=new byte[500];
	File fileLoad = new File("D:/BB文档/","Billing_Menu_BBF_OOTB.xls");
	response.setHeader("Content-disposition","attachment;filename="+"Billing_Menu_BBF_OOTB.xls");
	response.setContentType("application/x-tar");
	long fileLength=fileLoad.length();
	String length = String.valueOf(fileLength);
	response.setHeader("Content_Length",length);
	FileInputStream in=new FileInputStream(fileLoad);
	int n=0;
	while((n=in.read(b))!=-1){
		o.write(b,0,n);
	}	
	
%>
</body>
</html>


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