public class Client {
 public static void main(String[] args) throws Exception{

  //打開一個(gè)套接字，準(zhǔn)備發(fā)送請求
  Socket socket = new Socket("localhost", 9996);//得先建立連接，就是所謂的TCP是建立可靠的連接

  System.out.println("尊敬的VIP客戶，請求數(shù)據(jù)小分隊(duì)已準(zhǔn)備好，請輸入您的請求：");

  //向服務(wù)端發(fā)送帶著客戶端請求的數(shù)據(jù)，這個(gè)請求數(shù)據(jù)是從鍵盤讀入的，發(fā)送給服務(wù)端是以PrintWriter的形式包裝
  PrintWriter out =new PrintWriter(socket.getOutputStream(),true);

  //輸入流getInputStream()，單獨(dú)開一個(gè)線程在Receive類中完成接收服務(wù)器發(fā)來的數(shù)據(jù)
  Thread t = new Thread(new Receive(socket));
  t.start();

  Scanner scanner =new Scanner(System.in);//鍵盤輸入
  while(scanner.hasNextLine()){
   out.println(scanner.nextLine());//將從鍵盤輸入的數(shù)據(jù)發(fā)送出去
  }

 }
}

public class Receive implements Runnable {
 private Socket socket;
 public Receive(Socket socket) {
  this.socket=socket;
 }

 @Override
 public void run() {
  try {
   Scanner scanner =new Scanner(socket.getInputStream());//接收數(shù)據(jù)
   String str =null;
   while(true){
    str=scanner.nextLine();
    System.out.println("服務(wù)器說："+str);//打印接收的數(shù)據(jù)
   }
  } catch (IOException e) {
   e.printStackTrace();
  }

 }

}

public class Server {
 public static void main(String[] args) throws Exception{

  ServerSocket server = new ServerSocket(9996);//在端口9996開一個(gè)服務(wù)，監(jiān)聽客戶端發(fā)來的請求，準(zhǔn)備接收客戶端發(fā)來的請求數(shù)據(jù)

  System.out.println("服務(wù)端準(zhǔn)備完畢，隨時(shí)待命接收請求！");

  Socket socket =server.accept();//只有當(dāng)有客戶端請求并連接時(shí)，才回返回一個(gè)Socket對象，這個(gè)對象就是帶著客戶端請求的那個(gè)Socket對象


  //創(chuàng)建一個(gè)PrintWriter的實(shí)例對象out來完成服務(wù)端向客戶端的輸出數(shù)據(jù)的任務(wù)，
  PrintWriter out = new PrintWriter(socket.getOutputStream(),true);

  //單獨(dú)開一個(gè)線程接收從客戶端過來的請求，在Receive1類中完成數(shù)據(jù)的接收
  Thread t = new Thread(new Receive1(socket));
  t.start();

  /*一定要理解Socket是一個(gè)用于機(jī)器之間通信的類*/

  //發(fā)送數(shù)據(jù)給客戶端
  Scanner scanner = new Scanner(System.in);//鍵盤輸入服務(wù)端要發(fā)給客戶端的數(shù)據(jù)
  while(scanner.hasNextLine()){
   out.println(scanner.nextLine());//將鍵盤輸入的服務(wù)端要發(fā)給客戶端的數(shù)據(jù)封裝在PrintWriter類的對象中
  }
 }
}

public class Receive1 implements Runnable {
 private Socket socket;
 public Receive1(Socket socket) {
  this.socket=socket;//在服務(wù)端接收客戶端發(fā)來的數(shù)據(jù)需要調(diào)用Receive1()這個(gè)方法，就會(huì)得到一個(gè)Socket對象，這個(gè)對象就是攜帶著客戶端請求的socket
 }

 @Override
 public void run() {
  try {
   Scanner scanner=new Scanner(socket.getInputStream());//獲得客戶端從鍵盤接收的輸入流
   String str = null;
   while(true){
    str=scanner.nextLine();
    System.out.println("客戶端發(fā)來的數(shù)據(jù)："+str);
   }
  } catch (IOException e) {
   e.printStackTrace();
  }//接收數(shù)據(jù)
 }

}