package com.zhengzz.echo;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

class EchoC{
  
  private Socket socket;
  
  public EchoC() {
    // TODO Auto-generated constructor stub
    try {
      socket = new Socket("localhost", 60000);
    } catch (UnknownHostException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
  
  public void Client() {
    try {
      BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
      PrintWriter pw = new PrintWriter(socket.getOutputStream(), true);
      BufferedReader lbr = new BufferedReader(new InputStreamReader(System.in));
      
      String linestr = null;
      while ((linestr = lbr.readLine()) != null) {
        
        pw.println(linestr);
        
        System.out.println(br.readLine());
        
        if (linestr.equals("bye#")) {
          break;
        }
      }
      
      
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}

public class echoClient {

  public static void main(String[] args) {
    new EchoC().Client();
  }

}

package com.zhengzz.echo;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

class EchoS{
  
  private ServerSocket serverSocket;
  
  public EchoS() {
    
    try {
      serverSocket = new ServerSocket(60000);
    } catch (IOException e) {
      e.printStackTrace();
    }
    
  }
  
  public void Server() {
    while (true) {
      try {
        Socket socket = serverSocket.accept();
        
        System.out.println("client:" + socket.getInetAddress() + ":" + socket.getLocalPort());

        BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        PrintWriter pw = new PrintWriter(socket.getOutputStream(), true);

        String linestr;

        while ((linestr = br.readLine()) != null) {

          System.out.println(linestr);

          pw.println("--->" + linestr);

        }
      } catch (IOException e) {
        System.out.println("连接断开：（");
      }

    }
}
}

public class echoServer {

  public static void main(String[] args) {
    new EchoS().Server();
  }

}

package com.defonds.socket.begin; 
 
import java.io.BufferedReader; 
import java.io.DataInputStream; 
import java.io.DataOutputStream; 
import java.io.InputStreamReader; 
import java.net.ServerSocket; 
import java.net.Socket; 
 
public class Server { 
  public static final int PORT = 12345;//监听的端口号   
   
  public static void main(String[] args) {  
    System.out.println("服务器启动...\n");  
    Server server = new Server();  
    server.init();  
  }  
  
  public void init() {  
    try {  
      ServerSocket serverSocket = new ServerSocket(PORT);  
      while (true) {  
        // 一旦有堵塞, 则表示服务器与客户端获得了连接  
        Socket client = serverSocket.accept();  
        // 处理这次连接  
        new HandlerThread(client);  
      }  
    } catch (Exception e) {  
      System.out.println("服务器异常: " + e.getMessage());  
    }  
  }  
  
  private class HandlerThread implements Runnable {  
    private Socket socket;  
    public HandlerThread(Socket client) {  
      socket = client;  
      new Thread(this).start();  
    }  
  
    public void run() {  
      try {  
        // 读取客户端数据  
        DataInputStream input = new DataInputStream(socket.getInputStream()); 
        String clientInputStr = input.readUTF();//这里要注意和客户端输出流的写方法对应,否则会抛 EOFException 
        // 处理客户端数据  
        System.out.println("客户端发过来的内容:" + clientInputStr);  
  
        // 向客户端回复信息  
        DataOutputStream out = new DataOutputStream(socket.getOutputStream());  
        System.out.print("请输入:\t");  
        // 发送键盘输入的一行  
        String s = new BufferedReader(new InputStreamReader(System.in)).readLine();  
        out.writeUTF(s);  
         
        out.close();  
        input.close();  
      } catch (Exception e) {  
        System.out.println("服务器 run 异常: " + e.getMessage());  
      } finally {  
        if (socket != null) {  
          try {  
            socket.close();  
          } catch (Exception e) {  
            socket = null;  
            System.out.println("服务端 finally 异常:" + e.getMessage());  
          }  
        }  
      }  
    }  
  }  
}  

package com.defonds.socket.begin; 
 
import java.io.BufferedReader; 
import java.io.DataInputStream; 
import java.io.DataOutputStream; 
import java.io.IOException; 
import java.io.InputStreamReader; 
import java.net.Socket; 
 
public class Client { 
  public static final String IP_ADDR = "localhost";//服务器地址  
  public static final int PORT = 12345;//服务器端口号  
   
  public static void main(String[] args) {  
    System.out.println("客户端启动...");  
    System.out.println("当接收到服务器端字符为 \"OK\" 的时候, 客户端将终止\n");  
    while (true) {  
      Socket socket = null; 
      try { 
        //创建一个流套接字并将其连接到指定主机上的指定端口号 
        socket = new Socket(IP_ADDR, PORT);  
          
        //读取服务器端数据  
        DataInputStream input = new DataInputStream(socket.getInputStream());  
        //向服务器端发送数据  
        DataOutputStream out = new DataOutputStream(socket.getOutputStream());  
        System.out.print("请输入: \t");  
        String str = new BufferedReader(new InputStreamReader(System.in)).readLine();  
        out.writeUTF(str);  
          
        String ret = input.readUTF();   
        System.out.println("服务器端返回过来的是: " + ret);  
        // 如接收到 "OK" 则断开连接  
        if ("OK".equals(ret)) {  
          System.out.println("客户端将关闭连接");  
          Thread.sleep(500);  
          break;  
        }  
         
        out.close(); 
        input.close(); 
      } catch (Exception e) { 
        System.out.println("客户端异常:" + e.getMessage());  
      } finally { 
        if (socket != null) { 
          try { 
            socket.close(); 
          } catch (IOException e) { 
            socket = null;  
            System.out.println("客户端 finally 异常:" + e.getMessage());  
          } 
        } 
      } 
    }  
  }  
}