java实现 TCP通信

//服务端
import com.hl.bluetooth.util.CRC16;
import com.hl.bluetooth.util.FrameCheckFailedException;
import com.hl.bluetooth.util.stream.StreamUtils;
import com.hl.bluetooth.util.util;
import lombok.SneakyThrows;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.ByteBuffer;
import java.util.Arrays;

/**
 * @author hwx
 * @date 2021/11/4
 */
public class TcpServer extends ServerSocket {

    private static final Logger logger = LoggerFactory.getLogger(TcpServer.class);

    public TcpServer(int serverPort) throws IOException {
        super(serverPort);
        try {
            while (true) {
                Socket socket = accept();
                new ServerThread(socket);
            }
        } catch (Exception e) {
            logger.error("tcp服务器已停止监听");
        } finally {
            close();
        }
    }

    class ServerThread extends Thread       /*建立服务端线程*/ {
        private Socket socket;
        private DataInputStream inputStream;
        private InputStream in;
        private InputStream i;
        private byte[] bytes;

        private DataOutputStream out;

        public ServerThread(Socket s) throws Exception {
            logger.info("tcp服务器开始监听......");
            this.socket = s;
            in = socket.getInputStream();
            inputStream = new DataInputStream(in);
/*            in = new BufferedReader(new InputStreamReader(
                    socket.getInputStream(), "GB2312"));        *//*国标码*/
            out = new DataOutputStream(socket.getOutputStream());
            String str = s.getInetAddress().getHostAddress();
            StreamUtils.setOutputStream(s.getInetAddress().getHostAddress(), new DataOutputStream(socket.getOutputStream()));
            StreamUtils.setInputStream(s.getInetAddress().getHostAddress(), new DataInputStream(socket.getInputStream()));

            // 开始线程
            start();
        }

        @SneakyThrows
        @Override
        public void run() {
            try {
　　　　　　　　　　Scanner scanner = new Scanner(System.in);// 装饰标准输入流，用于从控制台输入
                while (true) {

　　　　　　　　　　　　　　String send = scanner.nextLine();//读取控制台输入的内容
　　　　　　　　　　　　　　System.out.println("客户端：" + send);//输出键盘输出内容提示 ，也就是客户端向服务器端发送的消息
　　　　　　　　　　　　　　// 把从控制台得到的信息传送给服务器
　　　　　　　　　　　　　　out.writeUTF("客户端：" + send);//将客户端的信息传递给服务器
　　　　　　　　　　　　　　String accpet = in.readUTF();// 读取来自服务器的信息
　　　　　　　　　　　　　　System.out.println(accpet);//输出来自服务器的信息

                }
            } catch (Exception e) {
                logger.error(socket.getInetAddress().getHostAddress() + "连接断开-----" + e.getMessage(), e);
            } finally {
                DataOutputStream outputStream = StreamUtils.getOutputStream(socket.getInetAddress().getHostAddress());
                outputStream.close();
                inputStream.close();
                socket.close();
            }

        }

//客户端
import java.io.*;
import java.net.Socket;
import java.net.UnknownHostException;

/**
 * @author hwx
 * @date 2021/11/4
 */
public class TcpClient {
    /**
     * 定义socket连接
     */
    private Socket socket;
    private DataInputStream inputStream;
    /**
     * 打印到文本输出流
     */
    private PrintWriter writer;
    private OutputStream outputStream;

    public TcpClient(int serverPort) {                 /*定义客户端端口号*/
        try {                                                       /*抛异常*/
            socket = new Socket("192.168.153.202", serverPort);
            inputStream = new DataInputStream(
                    /*标准输入输出流*/
                    socket.getInputStream());
            writer = new PrintWriter(socket.getOutputStream());
            outputStream = socket.getOutputStream();
            while (true) {
                BufferedReader in = new BufferedReader(
                        new InputStreamReader(System.in));
                String message = in.readLine();if ("finish".equals(message)) {
                    System.out.println("服务器已停止监听");
                    break;
                }
            }
            outputStream.close();
            writer.close();
            inputStream.close();            /*关闭流*/
            socket.close();

        } catch (UnknownHostException ex) {
            ex.printStackTrace();
        } catch (IOException ex) {
            ex.printStackTrace();       /*在命令行打印异常信息在程序中出错的位置及原因*/
        }
    }

}