applet与servlet通信！

[fengdabin]

我想完成applet到servlet的通讯，我是利用java.net.*，所提供的服务。
看了很多相关材料，而且感觉代码很容易理解，不知道为什么，我自己尝试，就是不行，请帮帮忙，先谢了。

applet程序：
public class TestApplet extends Applet {
URL url;
URLConnection urlcon;
int hello;
public void init(){
try{
hello=111;
String link="http://localhost:8080/examples/servlet/TestServlet";
url=new URL(link);
urlcon = url.openConnection();
urlcon.setDoOutput(true);
urlcon.setDoInput(true);
urlcon.setUseCaches (false);
urlcon.setDefaultUseCaches (false);

DataOutputStream dos=new DataOutputStream(urlcon.getOutputStream());
dos.writeByte(hello);

dos.flush();
dos.close();

}catch(ProtocolException pe){
pe.printStackTrace();
}
catch(Exception e){
e.printStackTrace();
}
}

}

Servlet程序：

import java.io.*;

import javax.servlet.*;
import javax.servlet.http.*;

public class TestServlet extends HttpServlet
{
public void init(ServletConfig config) throws ServletException{
super.init(config);
}

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

public void doPost(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException
{
System.out.println("hello");
DataInputStream in = new DataInputStream(request.getInputStream());

try {
int hello;
hello=in.readByte();
in.close();
System.out.println(" "+hello);
} catch (Exception exp) {
exp.printStackTrace();
}
}
}