java实现内网通信

 package newTest;

 import java.io.OutputStream;
 import java.net.ServerSocket;
 import java.net.Socket;

 /**
  * @author liuwenlong
  * @create 2020-08-10 14:29:40
  */
 @SuppressWarnings("all")
 public class LwlClient {
     public static void main(String[] args) {
         if (args.length != 2) {
             System.out.println("usage:java TcpServer port[5000~9999]");
             return;
         }
         try {
             Socket socket = new Socket(args[0], Integer.parseInt(args[1]));
             OutputStream out = socket.getOutputStream();
             byte b[] = new byte[300];
             while (true) {
                 System.out.print("mymsg>");
                 int len = System.in.read(b);
                 if (len < 1) continue;

                 if (b[len - 2] == 13 && b[len - 1] == 10) {
                     len = len - 2;
                 } else {
                     len = len - 1;
                 }
                 if (len == 0) continue;
                 out.write(b, 0, len);
             }
         } catch (Exception e) {
             System.err.println(e.getMessage());
         }
     }
 }

 package newTest;

 import java.io.InputStream;
 import java.net.ServerSocket;
 import java.net.Socket;

 /**
  * @author liuwenlong
  * @create 2020-08-10 13:38:07
  */
 @SuppressWarnings("all")
 class ServerThread extends Thread {
     Socket socket;

     public ServerThread() {
     }

     public ServerThread(Socket socket) {
         this.socket = socket;
     }

     @Override
     public void run() {
         try {
             byte b[] = new byte[300];
             InputStream in = socket.getInputStream();
             while (true) {
                 int len = in.read(b);
                 System.out.println(new String(b, 0, len));
             }

         } catch (Exception e) {
             System.err.println(e.getMessage());
         }
     }
 }

 public class TcpServer {
     public static void main(String[] args) {
         if (args.length != 1) {
             System.out.println("usage:java TcpServer port[5000~9999]");
             System.exit(0);
         }

         try {
             ServerSocket server = new ServerSocket(Integer.parseInt(args[0]));
             while (true) {
                 Socket socket = server.accept();
                 new ServerThread(socket).start();
             }
         } catch (Exception e) {
             System.err.println(e.getMessage());
         }
     }
 }