项目的小结

1.实现实时聊天

1.服务端建立一个ConcurrentHashMap<> 用来存储在线用户，用户账号和socket然后，如果有个人发了信息，就去数据库中查询，然后根据这个在线用户进行传递信息

服务端框架：


public class ServerMain {

    private static ConcurrentHashMap<Integer, Socket> onlineUsers = new ConcurrentHashMap<>();
    public static void main(String[] args) throws Exception {
        ServerSocket serverSocket = new ServerSocket(8888);

        //返回一个最多5个线程的线程池
        ExecutorService es = Executors.newFixedThreadPool(5);

        while (true) {

            Socket socket = serverSocket.accept();
            es.submit(new myRunnable(socket,onlineUsers));

        }

    }
}

public class myRunnable implements Runnable {
    private Socket socket;
    private VerificationCodeTool verificationCodeTool = new VerificationCodeTool();
    //记录在线用户，不断更新界面
    private ConcurrentHashMap<Integer, Socket> onlineUsers;
    Student student;
    Teacher teacher;
    int UserId;      //用来删除

    public myRunnable(Socket socket,ConcurrentHashMap onlineUsers) {
        this.socket = socket;
        this.onlineUsers = onlineUsers;
    }

    @Override
    public void run() {
        long lastTime = 0;
        while (!socket.isClosed()) {
            try {
                Message requestMessage = SocketUtil.getSocketUtil().getMessage(socket);
                if (requestMessage == null) {
                    System.out.println("message 为空");
                    break;
                }
            //后面进行请求操作