java tcp的理解

java网络编程的理解
tcp
server端

import java.io.DataInputStream;
import java.net.ServerSocket;
import java.net.Socket;
public class testtcpserver {
 public static void main(String[] args) throws Exception {
  // TODO Auto-generated method stub
  ServerSocket ss = new ServerSocket(6666);//
  while(true) {
  Socket s = ss.accept();//接受
  System.out.println("a client connect");
  DataInputStream dis = new DataInputStream(s.getInputStream());
  System.out.println(dis.readUTF());
  dis.close();
  s.close();
  }
 }

}

client端

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.OutputStream;
import java.net.Socket;
public class tcpclient {
 public static void main(String[] args) throws Exception{
  Socket s = new Socket("192.168.1.90",6666);//申请
  OutputStream os = s.getOutputStream();
  DataOutputStream dos = new DataOutputStream(os);
  Thread.sleep(5000);
  dos.writeUTF("helle server");
  dos.flush();
  dos.close();
  s.close();
 }
}