Qt教程 — 2.2 深入了解Qt信号与槽

        new ServerSocket(int)是开启监听端口，并不是连接端口。真正的连接端口是随机开辟的空闲端口，当连接创建完成后，监听关口可以继续等待下一次连接请求，处于空闲等待状态。

编程实现方式

1 、主线程一直处于阻塞等待状态，如果一旦链接成功则启动一个新线程对外提供服务。

2 、启动工作线程时将链接对象 Socket 传递过去，在 run 方法中执行处理逻辑。

服务器编程实现

public class MyServer {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = new ServerSocket(9000);
        while (true){
            Socket scoket = serverSocket.accept();
            new WorkThread(scoket).start();
        }
    }
}
class WorkThread extends Thread{
    private Socket scoket;
    public WorkThread(Socket scoket){
        this.scoket = scoket;
    }

    @Override
    public void run() {
        try {
            InputStream is = scoket.getInputStream();
            OutputStream os = scoket.getOutputStream();
            BufferedReader br = new BufferedReader(new InputStreamReader(is));
            PrintWriter out = new PrintWriter(os);
            String str = br.readLine();
            out.println("收到"+str);
            out.flush();
            out.close();
            br.close();
            scoket.close();
        } catch (IOException e) {
            System.out.println(e.getMessage());
        }
    }
}

客户端编程实现

public class MyClient {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("你想给服务器说：");
        String str1 = br.readLine();
        Socket socket = new Socket("localhost",9001);
        System.out.println(socket.getInetAddress());
        System.out.println(socket.getPort());
        InputStream is = socket.getInputStream();
        OutputStream os = socket.getOutputStream();
        BufferedReader br2= new BufferedReader(new InputStreamReader(is));
        PrintWriter out = new PrintWriter(os);
        out.println(str1);
        out.flush();
        String str2 = br2.readLine();
        System.out.println(str2);
        br2.close();
        out.close();
        br.close();
    }
}