基于TCP实现的Socket通讯详解

Socket通信是基于TCP协议进行的传输层通信，是在应用和应用之间的通信，一般应用在即时通讯上。

建立连接

用Socket创建连接需要在客户端和服务端都使用socket套接字。

Linux内存创建Socket,只是创建的socket使用有些差异。

public class EchoServer{
         private int port;
         Socket socket;
         public EchoServer(int port){
             this.port = port;  
        }  
        
         private void run() throws IOException{
             ServerSocket serverSocket = new ServerSocket(port);
             while(true){
                socket = serverSocket.accept();
                new Thread(()->{
                    write(socket);
                }).start();
             }
        }
 
        private void write(Socket socket){
             InputStream in =  socket.getInputStream();  
             OutputStream out = socket.getOutputStream();
             int n ;
             byte[]  b = new byte[1024];
             while((n=in.read(b))>0){
                   out.write(b,0,b.length);
             } 
        }
        public void static main(String[] args){
             EchoServer server = new EchoServer(7890);
             server.run();
        }
 }

public class EchoClient{
     private Socket socket;
     private static String host;
     private static int port;
 
     public EchoClient(String host,int port){
         this.host = host;
         this.port = port;
     }
 
      public void run() throws IOException{
          InputStream in = socket.getInputStream();
          OutputStream out = socket.getOutputStream();
          new Thread(()->{
　　　　　　int n ;
          byte[] b = new byte[1024];
          while((n=in.read(b))>0){
             System.out.write(b,0,b.length);
          }
          }).start();
          int n ;
          byte[] b = new byte[1024];
          while((n=System.out.read(b))>0){
             out.write(b,0,n);
          }
      }
     public void static main(String[] args){
           EchoClient client = new EchoClient("localhost",7890);
           client.run();
                     
     }
}