摘要：代碼實戰啟動類服務啟動類啟動類線程監聽端口服務類監聽端口主服務監聽端口服務端啟動成功，端口服務端啟動失敗線程模式，防止注釋啟動客戶端接受服務端異常客戶端接入監聽類客戶端接入監聽類數據連接值新客戶端接入對客戶端的業務處理，接收并重寫回去客戶

package com.example.demo.server;

/**
 * @author  MySelf
 * @create  2018/9/29
 * @desc 服務啟動類
 **/
public class ServerBoot {

    private static final int PORT = 8000;

    /**
     * 啟動Server類線程
     * @param args
     */
    public static void main(String[] args) {
        Server server = new Server(PORT);
        server.start();
    }

}

package com.example.demo.server;

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

/**
 * @author  MySelf
 * @create  2018/9/29
 * @desc Server監聽端口主服務
 **/
public class Server {

    private ServerSocket serverSocket;

    /**
     * 監聽端口
     * @param port
     */
    public Server(int port){
        try {
            this.serverSocket = new ServerSocket(port);
            System.out.println("服務端啟動成功，端口："+port);
        }catch (IOException e){
            System.out.println("服務端啟動失敗");
        }
    }

    /**
     * 線程模式，防止注釋
     */
    public void start(){
        new Thread(new Runnable() {
            @Override
            public void run() {
                doStart();
            }
        }).start();
    }

    /**
     * 啟動客戶端接受
     */
    private void doStart() {
        while (true){
            try {
                Socket client = serverSocket.accept();
                new ClientHandler(client).start();
            }catch (IOException e){
                System.out.println("服務端異常");
            }
        }
    }

}

package com.example.demo.server;

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

/**
 * @author  MySelf
 * @create  2018/9/29
 * @desc 客戶端接入監聽類
 **/
public class ClientHandler {

    /** 數據連接值 */
    public static final int MAX_DATA_LEN = 1024;
    private final Socket socket;

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

    public void start(){
        System.out.println("新客戶端接入");
        new Thread(new Runnable() {
            @Override
            public void run() {
                doStart();
            }
        }).start();
    }

    /**
     * 對客戶端的業務處理，接收并重寫回去
     */
    private void doStart(){
        try {
            InputStream inputStream = socket.getInputStream();
            while (true){
                byte[] data = new byte[MAX_DATA_LEN];
                int len;
                while((len = inputStream.read(data)) != -1){
                    String message = new String(data,0,len);
                    System.out.println("客戶端傳來消息："+message);
                    socket.getOutputStream().write(data);
                }
            }
        }catch (IOException e){
            e.printStackTrace();
        }
    }

}

package com.example.demo.client;

import java.io.IOException;
import java.net.Socket;

/**
 * @author  MySelf
 * @create  2018/9/29
 * @desc 客戶端啟動類
 **/
public class Client {

    private static final String HOST = "127.0.0.1";
    private static final int PORT = 8000;
    private static final int SLEEP_TIME = 5000;

    public static void main(String[] args) throws IOException {

        final Socket socket = new Socket(HOST,PORT);

        /**
         * 客戶端啟動，定時向服務端發送數據
         */
        new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println("客戶端啟動成功！");
                while (true){
                    try {
                        String message = "hello world";
                        System.out.println("客戶端發送數據："+message);
                        socket.getOutputStream().write(message.getBytes());
                    }catch (Exception e){
                        System.out.println("寫數據出錯！");
                    }
                    sleep();
                }
            }
        }).start();
    }

    private static void sleep() {
        try {
            Thread.sleep(SLEEP_TIME);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

}

GitHub項目：基于Netty4與SpringBoot，聊天室WebSocket（文字圖片）、Iot物聯網-TCP/IP協議單片機通信，異步存儲聊天數據

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