javafx发送http请求

要使用JavaFX发送HTTP请求，可以使用HttpClient类。以下是一个示例代码：

import javafx.application.Application;
import javafx.concurrent.Task;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class HttpRequestExample extends Application {

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

    @Override
    public void start(Stage primaryStage) {
        Label responseLabel = new Label("Waiting for response...");

        Task<String> task = new Task<String>() {
            @Override
            protected String call() throws Exception {
                return sendHTTPRequest();
            }
        };

        task.setOnSucceeded(event -> {
            String response = task.getValue();
            responseLabel.setText(response);
        });

        new Thread(task).start();

        VBox root = new VBox(responseLabel);
        Scene scene = new Scene(root, 300, 200);

        primaryStage.setTitle("HTTP Request Example");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private String sendHTTPRequest() throws IOException {
        URL url = new URL("http://example.com");
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("GET");

        int responseCode = connection.getResponseCode();

        StringBuilder response = new StringBuilder();
        BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        String line;
        while ((line = reader.readLine()) != null) {
            response.append(line);
        }
        reader.close();

        return response.toString();
    }
}