jsp中实现压缩文件下载

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jsp中实现压缩文件下载
Author:lyore Date:2007-03-13 20:51

<%@ page language="java" import="java.io.,java.util.zip." pageEncoding="GBK"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=GBK" />

<title>File download!</title>

</head>

<body>

<%

response.setContentType("unknown");

String fileName =java.net.URLEncoder.encode("导出数据.rar","UTF-8");

response.setHeader("Content-disposition","attachment; filename="+fileName);

try

{

OutputStream os = response.getOutputStream();

ZipOutputStream zos = new ZipOutputStream(os);

ZipEntry entry = new ZipEntry("data.txt");

zos.putNextEntry(entry);

int number;

for(int i=0;i<15;i++)

{

byte[] buffer = ("中文"+i+System.getProperty("line.separator")).getBytes();

zos.write(buffer,0,buffer.length);

}

zos.closeEntry();

zos.close();

}catch(IOException e)

{

out.println(e);

}

%>

</body>

</html>
程序将一些中文字符和数字写入data.txt中并打包为导出数据.rar并弹出窗口供浏览者下载. 程序运行时开始总是显示一些乱码无法排除,在同事的帮助下才知道是mime类型作怪, 原来服务器上web.xml没有禁止对于rar文件的显示,编辑web.xml添加以下内容即可:

<mime-mapping>

<extension>rar</extension>

<mime-type>application/rar</mime-type>

</mime-mapping>