模擬Server/Client進程通信

一、服務器端

ServerSocket serverSocket = new ServerSocket(8080);//創建服務器套接字，

Socket socket = serverSocket.accept();//並等待連接

二、客戶端

Socket socket = new Socket("localhost",8080);//創建套接字並通過該套接字向服務器發送請求連接

客戶端代碼：

public class Client extends Application{
    //初始化駛入輸出流
    DataOutputStream outputStream = null;
    DataInputStream inputStream = null;
    @Override
    public void start(Stage primaryStage) throws Exception {
        BorderPane pane = new BorderPane();
        pane.setPadding(new Insets(10,10,10,10));
        pane.setLeft(new Label("輸入半徑: "));

        TextField tf = new TextField();
        tf.setAlignment(Pos.BOTTOM_LEFT);
        pane.setCenter(tf);

        BorderPane mainPane = new BorderPane();
        TextArea ta = new TextArea();
        mainPane.setCenter(new ScrollPane(ta));
        mainPane.setTop(pane);

        Scene scene = new Scene(mainPane,450,200);
        primaryStage.setTitle("Client");
        primaryStage.setScene(scene);
        primaryStage.show();

        try {
            Socket socket = new Socket("localhost",8080);
            inputStream = new DataInputStream(socket.getInputStream());
            outputStream = new DataOutputStream(socket.getOutputStream());

        }catch (IOException e){
            System.err.println(e);
        }

        tf.setOnAction(e->{
            try{
                double radius = Double.parseDouble(tf.getText().trim());
                outputStream.writeDouble(radius);
                outputStream.flush();
                double area = inputStream.readDouble();

                ta.appendText("半徑： "+radius+"\n");
                ta.appendText("從服務器得到的面積： "+area+"\n");
            }catch (IOException ex){
                ta.appendText(ex.toString()+"\n");
            }
        });
    }
}

服務器端代碼：

public class MultiThreadServer extends Application{
    private TextArea ta = new TextArea();
    private int clientNo = 0;
    @Override
    public void start(Stage primaryStage) throws Exception {
        Scene scene = new Scene(new ScrollPane(ta),450,200);
        primaryStage.setTitle("Server");
        primaryStage.setScene(scene);
        primaryStage.show();

        new Thread(()->{//ServerSocket accept()方法執行的時候花費時間，不應放在JavaFX程序線程中運行，因此放在一個獨立的線程中
            try{
                //服務器套接字
                ServerSocket serverSocket = new ServerSocket(8080);
                ta.appendText("服務器開始工作： "+new Date().toString()+"\n");
                while (true){
                    //等待連接
                    Socket socket = serverSocket.accept();
                    clientNo++;

                    Platform.runLater(()->{
                        ta.appendText("第 "+clientNo+" 個客戶端連接成功： "+new Date().toString()+"\n");

                        InetAddress inetAddress = socket.getInetAddress();
                        ta.appendText("客戶端"+clientNo+"的主機名爲："+inetAddress.getHostName()+"\n");
                        ta.appendText("客戶端"+clientNo+"的地址爲："+inetAddress.getHostAddress()+"\n");
                    });
                    //創建一個新線程處理通信
                    new Thread(new HandleAClient(socket)).start();
                }
            }catch (IOException e){
                e.printStackTrace();
            }
        }).start();

    }
    class HandleAClient implements Runnable{
        private Socket socket;

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

        @Override
        public void run() {
            try {
                //創建輸入輸出流接受客戶端的數據
                DataInputStream inputStream = new DataInputStream(socket.getInputStream());
                DataOutputStream outputStream = new DataOutputStream(socket.getOutputStream());
                while (true){
                    double radius = inputStream.readDouble();
                    double area = radius*radius*Math.PI;
                    outputStream.writeDouble(area);

                    Platform.runLater(()->{
                        ta.appendText("客戶端發過來的半徑："+radius+"\n");
                        ta.appendText("服務器發出去的面積："+area+"\n");
                    });
                }

            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}