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一个jsp文件实现从数据库中下载任意类型文件

2007-05-21 14:03 701 查看

<%@ page language="java" import="java.sql.*,java.io.*,java.net.URLDecoder,java.net.URLEncoder"%>
<%@ page contentType="text/html;charset=gb2312"%>
<html>
<body>
<%
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver").newInstance();
Connection con = DriverManager.getConnection("jdbc:microsoft:sqlserver://localhost:1444;DatabaseName=jspdev","sa","");

Statement stmt = con.createStatement();
String id=request.getParameter("id");
ResultSet rs = stmt.executeQuery("SELECT filename,content FROM TFILES where id="+id);

// if the resultset is not null
if (rs.next()){

String filename=rs.getString("filename");
response.setHeader("Content-Disposition",
"attachment;filename="+URLEncoder.encode(filename,"UTF-8"));
response.setHeader("Connection", "close");
response.setHeader("Content-Type", "application/octet-stream");

ServletOutputStream sout=response.getOutputStream();
InputStream in = rs.getBinaryStream("content");
byte b[] = new byte[1024*8];
for(int i=in.read(b);i!=-1;)
{
sout.write(b);
i=in.read(b);
}
sout.flush();
sout.close();
in.close();
}

rs.close();
stmt.close();
con.close();

%>
</body>
</html>

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