经典问题：文件下载求教

Question

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
public class Way extends HttpServlet {
    public void doGet(HttpServletRequest request, HttpServletResponse res)
//public void doGet(ServletRequest request, ServletResponse response)
    throws IOException //, ServletException
    {
String downloadFile = "C:\\java.txt";
ServletOutputStream outputstream = res.getOutputStream();
BufferedInputStream inputstream = new BufferedInputStream(new FileInputStream(downloadFile)); //res.setHeader("Content-encoding","x-gzip");
res.setContentType("text/plain");
res.setHeader("Content-Disposition","attachment; filename=\"" +downloadFile+ "\";");
res.setHeader("Accept-ranges","bytes");  int data;
while((data = inputstream.read()) != -1)
{
        outputstream.write(data);
}
    } public void init() throws ServletException
{ }
}