jsp实现文件的下载功能
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下一篇 2012-05-16 10:15:59
/ 个人分类：jsp
DownFile.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page import="java.io.*" %>
<%
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>显示现在的文件</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">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<center>
<h3>请选择要下载的文件</h3>
<hr/>
<%
String thePath=request.getRealPath("/");
File file=new File(thePath,"\\upload");
String str[]=file.list();//将路径下的文件名存储到str数组中
out.print("<table>");
for(int i=0;i<str.length;i++){
String ss=str[i];
out.print("<tr><td>"+ss+"</td><td><a href='FileUpDown/DownFileImp.jsp?name="+ss+"'>下载<a></td></tr>");
}
out.print("</table>");
%>
</center>
</body>
</html>
|
DownFileImp.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@page import="java.io.*"%>
<%
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>实现文件的下载</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">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<%
request.setCharacterEncoding("utf-8");
response.reset();
try{
String str=request.getParameter("name");//获得响应客户的输出流
str=new String(str.getBytes("iso8859-1"),"gb2312");
String thePath=request.getRealPath("/");
thePath=thePath.substring(0,thePath.lastIndexOf("\\"));
thePath=thePath+"\\upload\\";
File fileLoad=new File(thePath,str);//下载文件的位置
response.reset();
OutputStream o=response.getOutputStream();//获取输出流
BufferedOutputStream bos=new BufferedOutputStream(o);
byte b[]=new byte[500];//输出文件用的字节数组，每次发送500字节到输出流
response.setHeader("Content-disposition","attachment;filename="+
new String(str.getBytes("gb2312"),"iso8859-1"));//客户使用保存文件的对话框
response.setContentType("application/x-tar");//通知客户文件的mime类型
long fileLength=fileLoad.length();//通知客户文件的长度
String length=String.valueOf(fileLength);
response.setHeader("Content_Length",length);
FileInputStream in=new FileInputStream(fileLoad);//读取文件，并发送给客户端下载
int n=0;
while((n=in.read(b))!=-1){
bos.write(b,0,n);
}
bos.close();
}
catch(Exception e){
System.out.println(e);
response.reset();
}
%>
</body>
</html>
|
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