Java multi-threading implements communication between server and multiple clients

Use java language to build a network server to realize communication between the client and the server, so that the client has independent threads and does not interfere with each other.

Basic steps for applying multi-threading to realize communication between servers and multi-threads

The server creates a ServerSocket and calls accept() in a loop to wait for the client connection

The client creates a Socket and requests a connection with the server.

The server accepts the client's request and creates a socekt to establish a dedicated connection with the client.

The socket to establish the link is on a separate thread Dialogue

The server continues to wait for new links

Server-side Server.java

package test.concurrent.socket; 
  
import java.io.*; 
import java.net.InetAddress; 
import java.net.ServerSocket; 
import java.net.Socket; 
  
/** 
 * Created by dong on 15-6-22. 
 * 基于TCP协议的Socket通信，实现用户登录 
 * 服务器端 
 */
public class Server { 
  
  public static void main(String[] args) { 
  
    try { 
      //1、创建一个服务器端Socket,即ServerSocket, 指定绑定的端口，并监听此端口 
      ServerSocket serverSocket = new ServerSocket(8888); 
      Socket socket = null; 
      //记录客户端的数量 
      int count = 0; 
      System.out.println("***服务器即将启动，等待客户端的链接***"); 
      //循环监听等待客户端的链接 
      while (true){ 
        //调用accept()方法开始监听，等待客户端的链接 
        socket = serverSocket.accept(); 
        //创建一个新的线程 
        ServerThread serverThread = new ServerThread(socket); 
        //启动线程 
        serverThread.start(); 
  
        count++; //统计客户端的数量 
        System.out.println("客户端的数量: " + count); 
        InetAddress address = socket.getInetAddress(); 
        System.out.println("当前客户端的IP ： " + address.getHostAddress()); 
      } 
  
    } catch (IOException e) { 
      e.printStackTrace(); 
    } 
  } 
}

Server-side thread processing class ServerThread.java

package test.concurrent.socket; 
  
import java.io.*; 
import java.net.Socket; 
  
/** 
 * Created by dong on 15-6-22. 
 * 服务器端线程处理类 
 */
public class ServerThread extends Thread { 
  
  //和本线程相关的Socket 
  Socket socket = null; 
  public ServerThread(Socket socket){ 
    this.socket = socket; 
  } 
  
  //线程执行的操作，响应客户端的请求 
  public void run(){ 
  
    InputStream is = null; 
    InputStreamReader isr = null; 
    BufferedReader br = null; 
  
    OutputStream os = null; 
    PrintWriter pw = null; 
    try { 
  
      //获取一个输入流，并读取客户端的信息 
      is = socket.getInputStream(); 
      isr = new InputStreamReader(is); //将字节流转化为字符流 
      br = new BufferedReader(isr); //添加缓冲 
      String info = null; 
      //循环读取数据 
      while ((info = br.readLine()) != null){ 
        System.out.println("我是服务器，客户端说: " +info); 
      } 
  
      socket.shutdownInput(); //关闭输入流 
  
      //获取输出流，响应客户端的请求 
      os = socket.getOutputStream(); 
      pw = new PrintWriter(os); //包装为打印流 
      pw.write("欢迎你"); 
      pw.flush(); //将缓存输出 
  
  
    } catch (IOException e) { 
      e.printStackTrace(); 
    }finally { 
  
  
        try { 
          //关闭资源 
          if (pw != null) 
            pw.close(); 
          if (os != null) 
            os.close(); 
          if (is != null) 
            is.close(); 
          if (isr != null) 
            isr.close(); 
          if (br != null) 
            br.close(); 
          if (socket != null) 
            socket.close(); 
        } catch (IOException e) { 
          e.printStackTrace(); 
  
        } 
  
    } 
  
  
  
  } 
}

Client Client. java

package test.concurrent.socket; 
  
import java.io.*; 
import java.net.Socket; 
  
/** 
 * Created by dong on 15-6-22. 
 * 客户端 
 */
public class Client { 
  
  public static void main(String[] args) { 
  
    try { 
      //1、创建客户端Socket，指定服务器端口号和地址 
      Socket socket = new Socket("localhost",8888); 
      //2、获取输出流,向服务器发送信息 
      OutputStream os = socket.getOutputStream(); //字节输出流 
      PrintWriter pw = new PrintWriter(os); //将输出流包装为打印流 
      pw.write("用户名:tom; 密码：456"); 
      pw.flush(); 
      socket.shutdownOutput(); //关闭输出流 
  
      InputStream is = socket.getInputStream(); 
      InputStreamReader isr = new InputStreamReader(is); 
      BufferedReader br = new BufferedReader(isr); 
  
      String info = null; 
      //循环读取 
      while ((info = br.readLine()) != null){ 
        System.out.println("我是客户端:服务器说:" + info); 
      } 
  
      br.close(); 
      is.close(); 
      isr.close(); 
  
  
      pw.close(); 
      os.close(); 
      socket.close(); 
    } catch (IOException e) { 
      e.printStackTrace(); 
    } 
  } 
}

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