Socket实战——聊天

最新推荐文章于 2025-08-10 12:34:01 发布

风铃峰顶

最新推荐文章于 2025-08-10 12:34:01 发布

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CC 4.0 BY-SA版权

分类专栏： Java Socket

本文链接：https://blog.youkuaiyun.com/haoranhaoshi/article/details/86601771

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本文介绍了一个基于UDP协议的聊天室实战案例，展示了如何使用Java实现客户端之间的双向通信。通过创建DatagramSocket，发送和接收DatagramPacket，实现了两台设备间的数据包发送与接收功能。代码中详细解释了如何设置监听端口，处理输入输出，以及如何在FX平台上展示接收到的消息。

Socket实战系列：
Socket实战——UDP连接：https://blog.youkuaiyun.com/haoranhaoshi/article/details/86601468
Socket实战——TCP连接：https://blog.youkuaiyun.com/haoranhaoshi/article/details/86601522
Socket实战——查询数据库：https://blog.youkuaiyun.com/haoranhaoshi/article/details/86601566
Socket实战——监听数据库：https://blog.youkuaiyun.com/haoranhaoshi/article/details/86601584
Socket实战——聊天：https://blog.youkuaiyun.com/haoranhaoshi/article/details/86601771
Socket实战——文件上传：https://blog.youkuaiyun.com/haoranhaoshi/article/details/86601850
Socket实战——文件下载：https://blog.youkuaiyun.com/haoranhaoshi/article/details/86632897

项目下载地址（IDEA搭建）：https://download.youkuaiyun.com/download/haoranhaoshi/10933044

聊天方既能发送数据包，又能接收数据包。

package ChatByUDP;

import javafx.application.Application;
import javafx.application.Platform;
import javafx.beans.property.SimpleStringProperty;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.Pane;
import javafx.scene.text.Text;
import javafx.stage.Stage;
import javafx.stage.WindowEvent;

import java.io.IOException;
import java.net.*;

/**
 * 聊天方既能发送数据包，又能接收数据包
 */
public class ChatParticipant extends Application {

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) {
        TextField textField = new TextField();

        Button button = new Button("发送");
        button.setTranslateX(140);
        button.setOnAction(event -> {
            String content = textField.getText();
            if(content == null || content.equals("")){
                Alert alert = new Alert(Alert.AlertType.WARNING, "请输入发送内容", ButtonType.OK);
                alert.show();
                return;
            }

            byte[] message = content.getBytes();
            try {
                DatagramSocket datagramSocket = new DatagramSocket();
                // 数据包发往IP：127.0.0.1，端口：10003
                DatagramPacket datagramPacket = new DatagramPacket(message, message.length, InetAddress.getByName("127.0.0.1"), 10003);
                datagramSocket.send(datagramPacket);
            } catch (UnknownHostException e) {
                e.printStackTrace();
            } catch (SocketException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        });

        Label label = new Label();
        label.setTranslateY(50);
        new Thread(() -> {
            try {
                // 创建IP：127.0.0.1，端口：10002的Socket监听
                DatagramSocket datagramSocket = new DatagramSocket(10002, InetAddress.getByName("127.0.0.1"));
                while (true) {
                    byte[] receivedData = new byte[1024];
                    DatagramPacket datagramPacket = new DatagramPacket(receivedData, receivedData.length);
                    datagramSocket.receive(datagramPacket);
                    // 未收到则后续不执行
                    Platform.runLater(() ->
                            label.setText(new String(datagramPacket.getData(), 0, datagramPacket.getLength()))
                    );
                }
            } catch (UnknownHostException e) {
                e.printStackTrace();
            } catch (SocketException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }).start();

        primaryStage.setTitle("ChatParticipant");
        Pane pane = new Pane(textField, button, label);
        primaryStage.setScene(new Scene(pane, 400, 200));
        primaryStage.setX(100);
        primaryStage.setY(100);
        primaryStage.show();

        primaryStage.addEventHandler(WindowEvent.WINDOW_CLOSE_REQUEST, event -> {
            Platform.exit();
            System.exit(0);
        });
    }
}

package ChatByUDP;

import javafx.application.Application;
import javafx.application.Platform;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;
import javafx.stage.WindowEvent;

import java.io.IOException;
import java.net.*;

public class AnotherChatParticipant extends Application {

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) {
        TextField textField = new TextField();

        Button button = new Button("发送");
        button.setTranslateX(140);
        button.setOnAction(event -> {
            String content = textField.getText();
            if(content == null || content.equals("")){
                Alert alert = new Alert(Alert.AlertType.WARNING, "请输入发送内容", ButtonType.OK);
                alert.show();
                return;
            }

            byte[] message = content.getBytes();
            try {
                DatagramSocket datagramSocket = new DatagramSocket();
                // 数据包发往IP：127.0.0.1，端口：10002
                DatagramPacket datagramPacket = new DatagramPacket(message, message.length, InetAddress.getByName("127.0.0.1"), 10002);
                datagramSocket.send(datagramPacket);
            } catch (UnknownHostException e) {
                e.printStackTrace();
            } catch (SocketException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        });

        Label label = new Label();
        label.setTranslateY(50);
        new Thread(() -> {
            try {
                // 创建IP：127.0.0.1，端口：10003的Socket监听
                DatagramSocket datagramSocket = new DatagramSocket(10003, InetAddress.getByName("127.0.0.1"));
                while (true) {
                    byte[] receivedData = new byte[1024];
                    DatagramPacket datagramPacket = new DatagramPacket(receivedData, receivedData.length);
                    datagramSocket.receive(datagramPacket);
                    // 未收到则后续不执行
                    Platform.runLater(() ->
                            label.setText(new String(datagramPacket.getData(), 0, datagramPacket.getLength()))
                    );
                }
            } catch (UnknownHostException e) {
                e.printStackTrace();
            } catch (SocketException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }).start();

        primaryStage.setTitle("AnotherChatParticipant");
        Pane pane = new Pane(textField, button, label);
        primaryStage.setScene(new Scene(pane, 400, 200));
        primaryStage.setX(500);
        primaryStage.setY(100);
        primaryStage.show();

        primaryStage.addEventHandler(WindowEvent.WINDOW_CLOSE_REQUEST, event -> {
            Platform.exit();
            System.exit(0);
        });
    }
}