java fxml怎样与REST API交互 - 问答

要在JavaFX中使用FXML与REST API进行交互，您可以遵循以下步骤：

添加依赖项确保在项目的pom.xml文件中添加JavaFX和REST API客户端（如Apache HttpClient）的依赖项。

<dependencies>
    <dependency>
        <groupId>org.openjfx</groupId>
        <artifactId>javafx-controls</artifactId>
        <version>17.0.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpclient</artifactId>
        <version>4.5.13</version>
    </dependency>
</dependencies>

创建FXML界面创建一个FXML文件（例如：MyScene.fxml），并在其中添加所需的UI组件（如按钮、文本框等）。
编写控制器类创建一个JavaFX控制器类（例如：MyController.java），并实现以下功能：

加载FXML文件
发送HTTP请求到REST API
处理API响应并更新UI

import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

public class MyController {

    @FXML
    private TextField apiUrlField;

    @FXML
    private Button fetchButton;

    @FXML
    private Label resultLabel;

    private CloseableHttpClient httpClient = HttpClients.createDefault();

    @FXML
    public void initialize() {
        fetchButton.setOnAction(event -> fetchData());
    }

    private void fetchData() {
        String apiUrl = apiUrlField.getText();
        if (apiUrl == null || apiUrl.isEmpty()) {
            resultLabel.setText("Please enter a valid API URL.");
            return;
        }

        HttpGet request = new HttpGet(apiUrl);
        try {
            HttpResponse response = httpClient.execute(request);
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode == 200) {
                HttpEntity entity = response.getEntity();
                String result = EntityUtils.toString(entity);
                resultLabel.setText(result);
            } else {
                resultLabel.setText("Error: " + statusCode);
            }
        } catch (Exception e) {
            resultLabel.setText("Error: " + e.getMessage());
        } finally {
            try {
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

绑定控制器与FXML 在主应用程序类（例如：MainApp.java）中，将控制器与FXML文件关联。

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class MainApp extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception {
        Parent root = FXMLLoader.load(getClass().getResource("MyScene.fxml"));
        primaryStage.setTitle("JavaFX REST API Example");
        primaryStage.setScene(new Scene(root));
        primaryStage.show();
    }

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

现在，当用户在FXML界面中输入API URL并点击“Fetch”按钮时，控制器将发送HTTP请求到REST API，并将响应结果显示在界面上。

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