JAVA： Socket和ServerSocket网络编程

boolean isConnection=socket.isConnected() && !socket.isClosed();   //判断当前是否处于连接

public void service(){
    while(true){
        Socket socket=null;
        try{
            socket=serverSocket.accept();//从连接队列中取出一个连接，如果没有则等待
            System.out.println("新增连接："+socket.getInetAddress()+":"+socket.getPort());
            ...//接收和发送数据
        }catch(IOException e){e.printStackTrace();}finally{
            try{
                if(socket!=null) socket.close();//与一个客户端通信结束后，要关闭Socket
            }catch(IOException e){e.printStackTrace();}
        }
    }
}

public void service(){
    while(true){
        Socket socket=null;
        try{
            socket=serverSocket.accept();                        //主线程获取客户端连接
            Thread workThread=new Thread(new Handler(socket));    //创建线程
            workThread.start();                                    //启动线程
        }catch(Exception e){
            e.printStackTrace();
        }
    }
}

class Handler implements Runnable{
    private Socket socket;
    public Handler(Socket socket){
        this.socket=socket;
    }
    
    public void run(){
        try{
            System.out.println("新连接:"+socket.getInetAddress()+":"+socket.getPort());
            Thread.sleep(10000);
        }catch(Exception e){e.printStackTrace();}finally{
            try{
                System.out.println("关闭连接:"+socket.getInetAddress()+":"+socket.getPort());
                if(socket!=null)socket.close();
            }catch(IOException e){
                e.printStackTrace();
            }
        }
    }
}