jsp实现下载功能

 

<%@ page language="java"  pageEncoding="UTF-8"%>
//上面无需设置ContentType
<%
 response.addHeader("Pragma", "no-cache");
 response.addHeader("Cache-Control", "no-cache");
 response.addHeader("Expires", "Thu,01 Jan 1970 00:00:01 GMT");
 response.setContentType("bin;charset=gbk");
 response.addHeader("Content-Disposition","attachment; filename=filename");
 ServletOutputStream os = response.getOutputStream();
 //do something with OutputStream
 os.close(); 
%>