JavaFx之在当前界面打开另一个界面

    /**
     * 添加数据
     * @param actionEvent
     */
    @FXML
    public void addData(ActionEvent actionEvent) {
        // 打开新的场景需要UI更新线程执行
        Platform.runLater(()->{
            Stage saveDiary = StageManager.getStage("saveDiary");
            // 每次创建场景前，判断该场景是否被创建过，创建过直接显示场景即可，无需多次创建，但是需要清除上次输入的数据
            if(Objects.isNull(saveDiary)) {
                try {
                    FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("/fxml/saveDiary.fxml"));
                    Parent pane = (Parent)fxmlLoader.load();
                    Scene scene = new Scene(pane);
                    Stage stage = new Stage();
                    stage.setScene(scene);
                    stage.setTitle("添加数据");
                    stage.initStyle(StageStyle.TRANSPARENT);
                    stage.show();
                    // 存放Scene
                    StageManager.put("saveDiary", stage);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } else {
                saveDiary.show();
            }
        });
    }

import java.util.Map;
import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;

/**
 * 场景管理器
 */
public class StageManager {

    /**
     * 场景集合
     */
    private static Map<String, Stage> stageMap = new ConcurrentHashMap<>();

    /**
     * 根据key存放Scene
     * @param key
     * @param stage
     */
    public static void put(String key, Stage stage) {
        if(StringUtils.isEmpty(key)) {
            throw new RuntimeException("key不为空!");
        }
        if(Objects.isNull(stage)) {
            throw new RuntimeException("scene不为空!");
        }
        stageMap.put(key, stage);
    }

    /**
     * 根据key获取Scene
     * @param key
     * @return
     */
    public static Stage getStage(String key) {
        if(StringUtils.isEmpty(key)) {
            throw new RuntimeException("key不为空!");
        }
        return stageMap.get(key);
    }

}

    /**
     * 关闭当前场景
     * @param actionEvent
     */
    @FXML
    public void cancel(ActionEvent actionEvent) {
        Stage stage = StageManager.getStage("saveDiary");
        logger.info("stage: {}",stage);
        if(!Objects.isNull(stage)) {
            stage.close();
            logger.info("关闭场景成功!");
        }
    }