高手帮忙看下这个servlet，在线等，马上结帐！

编译通过了，然后放进去后发现只实现了前半个功能，各位达人能否帮忙改一下，小弟在此感激不尽！

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class PublicAsk extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request,response);
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
long lastmodify=new File("fz.jpg").lastModified();

String addrFrom = request.getParameter("addrFrom");
String addrTo = request.getParameter("addrTo");
String msg = addrFrom + " " + addrTo;
BufferedWriter out = new BufferedWriter(new FileWriter("addr.txt"));
out.write(msg);
out.close();//这一段都没问题

int count = 0;
PrintWriter output = response.getWriter();
while(count < 10){
long l=new File("fz.jpg").lastModified()-lastmodify;
if(l!=0)break;
output.println("waiting...");//页面上没显示，不知道提示是不是这样输出的？
count++;
try {
Thread.sleep(100);
} catch (Exception e) {
// TODO Auto-generated catch block
System.err.println(e.toString());
}
}
if(count == 10){
output.println("Timeout!");
try {
Thread.sleep(300);
} catch (Exception e) {
// TODO Auto-generated catch block
System.err.println(e.toString());
}
request.getRequestDispatcher("/public.jsp").forward(request, response);//超时返回
}
else{
request.getRequestDispatcher("/showmap.jsp").forward(request,response);//没超时跳转一个显示图片的网页
}
}
}