1.txt

socket 通信通信通信通信通信通信通信通信通信通信通信通信通信通信通信通信通信通信通信通信

服务器端：

import java.io.*;
import java.net.*;
public class Server extends Thread{
  PrintWriter output = null;
  BufferedReader input = null;
  String username;
  ServerSocket serverSocket = null;
  Socket clientSocket = null;
  public Server() {
      try {
        serverSocket = new  ServerSocket(50000);
      }
      catch (IOException e) {
        System.out.println("Error" + e);
        System.exit(1);
      }
    start();
  }
  public void run(){
    while(true){
      try {
        clientSocket = serverSocket.accept();
        output=new PrintWriter(new OutputStreamWriter(clientSocket.getOutputStream()));
        input=new  BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
        output.println("login:");
        output.flush();
        if ( (username = input.readLine()) == null) {
          System.out.println("readLine returned null");
          System.exit(1);
        }
        System.out.println("Username:" + username);
        output.println("login sucessful");
        output.flush();
        System.out.println(username + " has logged on");
        sleep(1000);
      }
      catch (Exception e) {
        e.printStackTrace();
        System.out.println("Accept failed.");
        System.exit(1);
      }
    }
  }
  public static void main(String[] args) {
    Server server1 = new Server();
  }
}