public class hiveBinaryTranslate extends Application { public static void main(String[] args) { launch(args); } @Override public void start(Stage primaryStage) throws Exception { Task<BufferedImage> queryTask = new Task<BufferedImage>() { @Override protected BufferedImage call() throws Exception { String CONNECTION_URL = "jdbc:hive2://192.168.88.100:10000/default"; String USERNAME = "root"; String PASSWORD = "123456"; String JDBC_DRIVER = "org.apache.hive.jdbc.HiveDriver"; Class.forName(JDBC_DRIVER); Connection conn = DriverManager.getConnection(CONNECTION_URL, USERNAME, PASSWORD); Statement stmt = conn.createStatement(); String sql = "SELECT data FROM picture_01 WHERE dt = '2023-07-13'"; ResultSet rs = stmt.executeQuery(sql); rs.next(); InputStream inputStream = rs.getBinaryStream("data"); BufferedImage bufferedImage = ImageIO.read(inputStream); rs.close(); stmt.close(); conn.close(); inputStream.close(); return bufferedImage; } }; queryTask.setOnSucceeded(event -> { BufferedImage bufferedImage = queryTask.getValue(); Image image = SwingFXUtils.toFXImage(bufferedImage, null); ImageView imageView = new ImageView(image); Scene scene = new Scene(imageView.getParent()); primaryStage.setTitle("Image Viewer"); primaryStage.setScene(scene); primaryStage.show(); }); queryTask.setOnFailed(event -> { Throwable exception = queryTask.getException(); // 处理异常 exception.printStackTrace(); }); Thread queryThread = new Thread(queryTask); queryThread.start(); } }报错Exception in thread "JavaFX Application Thread" java.lang.NullPointerException at javafx.embed.swing.SwingFXUtils.toFXImage(SwingFXUtils.java:85) at hiveBinaryTranslate.lambda$start$0(hiveBinaryTranslate.java:49) 如何修改

根据报错信息，空指针异常发生在`SwingFXUtils.toFXImage`这一行，可能是因为`bufferedImage`为空。这可能是因为查询结果为空或者读取`inputStream`时发生了异常。

要解决这个问题，你可以在使用`rs.next()`之前先检查结果集中是否有数据，可以使用`rs.first()`方法来判断。同时，你也可以在`try-catch`块中处理可能的异常，以确保资源的正确关闭。

下面是修改后的代码示例：

public class hiveBinaryTranslate extends Application {
    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        Task<BufferedImage> queryTask = new Task<BufferedImage>() {
            @Override
            protected BufferedImage call() throws Exception {
                String CONNECTION_URL = "jdbc:hive2://192.168.88.100:10000/default";
                String USERNAME = "root";
                String PASSWORD = "123456";
                String JDBC_DRIVER = "org.apache.hive.jdbc.HiveDriver";

                Class.forName(JDBC_DRIVER);
                Connection conn = DriverManager.getConnection(CONNECTION_URL, USERNAME, PASSWORD);
                Statement stmt = conn.createStatement();
                String sql = "SELECT data FROM picture_01 WHERE dt = '2023-07-13'";
                ResultSet rs = stmt.executeQuery(sql);
                
                BufferedImage bufferedImage = null;
                
                if (rs.first()) { // 检查结果集中是否有数据
                    InputStream inputStream = rs.getBinaryStream("data");
                    bufferedImage = ImageIO.read(inputStream);
                    inputStream.close();
                }
                
                rs.close();
                stmt.close();
                conn.close();
                
                return bufferedImage;
            }
        };

        queryTask.setOnSucceeded(event -> {
            BufferedImage bufferedImage = queryTask.getValue();
            if (bufferedImage != null) {
                Image image = SwingFXUtils.toFXImage(bufferedImage, null);
                ImageView imageView = new ImageView(image);
                Scene scene = new Scene(imageView.getParent());
                primaryStage.setTitle("Image Viewer");
                primaryStage.setScene(scene);
                primaryStage.show();
            } else {
                // 处理结果为空的情况
            }
        });

        queryTask.setOnFailed(event -> {
            Throwable exception = queryTask.getException();
            // 处理异常
            exception.printStackTrace();
        });

        Thread queryThread = new Thread(queryTask);
        queryThread.start();
    }
}

请注意，如果结果集为空，你需要根据业务需求来处理结果为空的情况。