网络编程

Posted 2020-10-29 bigstrawberrywakaka

服务器程序接收数据，客户端程序发送数据。

客户端将圆半径发送给服务器，服务器将圆面积返回给客户端。

服务器程序

 1 package java语言程序设计进阶篇;
 2 
 3 import javafx.application.Application;
 4 import javafx.application.Platform;
 5 import javafx.scene.Scene;
 6 import javafx.scene.control.ScrollPane;
 7 import javafx.scene.control.TextArea;
 8 import javafx.stage.Stage;
 9 import java.io.DataInputStream;
10 import java.io.DataOutputStream;
11 import java.io.IOException;
12 import java.net.ServerSocket;
13 import java.net.Socket;
14 import java.util.Date;
15 
16 public class Server extends Application{
17     @Override
18     public void start(Stage primaryStage){
19         //界面
20         TextArea ta = new TextArea();
21 
22         Scene scene = new Scene(new ScrollPane(ta),450,200);
23         primaryStage.setTitle("Server");
24         primaryStage.setScene(scene);
25         primaryStage.show();
26         //新线程
27         new Thread(() -> {
28             try {
29                 ServerSocket serverSocket = new ServerSocket(8000);//新建服务器套接字
30                 Platform.runLater(() ->
31                         ta.appendText("Server started at " + new Date() + "\n"));
32 
33                 Socket socket = serverSocket.accept();//对客服机监听连接
34 
35                 DataInputStream inputFromClient = new  DataInputStream(
36                         socket.getInputStream());
37                 DataOutputStream outputStream = new DataOutputStream(
38                         socket.getOutputStream());
39                 while (true) {
40                     double radius = inputFromClient.readDouble();
41 
42                     double area = radius * radius * Math.PI;
43 
44                     outputStream.writeDouble(area);
45 
46                     Platform.runLater(() -> {
47                         ta.appendText("Radius received from client: " + radius + ‘\n‘);
48                         ta.appendText("Area is: " + area + ‘\n‘);
49                     });
50                 }
51             }
52                 catch(IOException ex){
53                     ex.printStackTrace();
54                 }
55             }).start();
56 

 

客户机程序：

 1 package java语言程序设计进阶篇;
 2 
 3 import javafx.application.Application;
 4 import javafx.geometry.Insets;
 5 import javafx.geometry.Pos;
 6 import javafx.scene.Scene;
 7 import javafx.scene.control.Label;
 8 import javafx.scene.control.ScrollPane;
 9 import javafx.scene.control.TextArea;
10 import javafx.scene.control.TextField;
11 import javafx.scene.layout.BorderPane;
12 import javafx.stage.Stage;
13 
14 import javax.xml.soap.Text;
15 import java.io.DataInputStream;
16 import java.io.DataOutputStream;
17 import java.io.IOException;
18 import java.net.Socket;
19 
20 public class Client extends Application{
21     //IO streams
22     DataOutputStream toServer = null;
23     DataInputStream fromServer = null;
24     @Override
25     public void start(Stage primaryStage){
26         BorderPane paneForTextField = new BorderPane();
27         paneForTextField.setPadding(new Insets(5,5,5,5));
28         paneForTextField.setStyle("-fx-border-color: green");
29         paneForTextField.setLeft(new Label("Enter a radius: "));
30 
31         TextField tf = new TextField();
32         tf.setAlignment(Pos.BOTTOM_RIGHT);
33         paneForTextField.setCenter(tf);
34 
35         BorderPane mainPane = new BorderPane();
36         TextArea ta = new TextArea();
37         mainPane.setCenter(new ScrollPane(ta));
38         mainPane.setTop(paneForTextField);
39 
40         Scene scene = new Scene(mainPane,450,200);
41         primaryStage.setTitle("Client");
42         primaryStage.setScene(scene);
43         primaryStage.show();
44 
45         tf.setOnAction(e ->{
46             try{
47                 double radius = Double.parseDouble(tf.getText().trim());
48 
49                 toServer.writeDouble(radius);
50                 toServer.flush();
51 
52                 double area = fromServer.readDouble();
53 
54                 ta.appendText("Radius is " + radius + "\n");
55                 ta.appendText("Area received from the server is " + area + ‘\n‘);
56             }
57             catch(IOException ex){
58                 System.out.println(ex);
59             }
60         });
61         try{
62             Socket socket = new Socket("localhost",8000);
63             fromServer = new DataInputStream(socket.getInputStream());
64 
65             toServer = new DataOutputStream(socket.getOutputStream());
66         }
67         catch (IOException ex){
68             ta.appendText(ex.toString() + ‘\n‘);
69         }
70     }
71 }