JavaFx：窗口切换和 ListView 以及 TableView 的值绑定，docker 面试题
import javafx.event.Event;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import javafx.scene.control.Alert.AlertType;
/**
@author hy
@createTime 2021-07-25 17:09:00
@description 主要的登录界面
*/
public class LoginController {
@FXML
TextField iotdbIp;
@FXML
TextField iotdbPort;
@FXML
TextField iotdbUsername;
@FXML
TextField iotdbPassword;
@FXML
Label loginMsg;
@FXML
public void login(Event event) {
// 检查登录参数是否填写完毕
boolean check = loginCheck();
if (check) {
IotDBProperties iotDBProperties = createIotDBProperties();
boolean checkCanConnectionTODB = checkCanConnectionTODB(iotDBProperties);
if (!checkCanConnectionTODB) {
MsgUtils.alert(AlertType.ERROR, "错误", "打开连接失败！");
loginMsg.setText("打开连接失败！");
loginMsg.setTextFill(Color.RED);
} else {
// 直接打开另外一个界面
try {
if (AppConstant.mainStage == null) {
openMainStage(new Stage());
}else {
openMainStage(AppConstant.mainStage);
}
} catch (IOException e) {
e.printStackTrace();
MsgUtils.alert(AlertType.ERROR, "错误", e.getMessage());
}
}
}
}
private void openMainStage(Stage mainStage) throws IOException {
Parent root = FXMLLoader.load(getClass().getResource("../resources/main.fxml"));
Scene scene = new Scene(root, 500, 450);
mainStage.setTitle("open other window");
mainStage.setScene(scene);
mainStage.setOnCloseRequest((event) -> {
AppConstant.loginStage.show();
mainStage.close();
});
// 保存上一次的状态
AppConstant.mainStage = mainStage;
AppConstant.loginStage.hide();
mainStage.show();
}
private boolean loginCheck() {
String ipString = iotdbIp.getText();
String portString = iotdbPort.getText();
String usernameString = iotdbUsername.getText();
String passwordString = iotdbPassword.getText();
if (StringUtils.isEmpty(ipString)) {
iotdbIp.setText(AppConstant.DEFAULT_IP);
}
if (StringUtils.isEmpty(portString)) {
iotdbPort.setText(String.valueOf(AppConstant.DEFAULT_PORT));
} else {
boolean intNum = NumberUtils.isIntNum(portString);
if (!intNum) {
MsgUtils.alert(AlertType.ERROR, "错误", "当前输入的端口=" + portString + "不是整数");
return false;
}
}
if (StringUtils.isEmpty(usernameString)) {
iotdbUsername.setText(AppConstant.DEFAULT_USERNAME);
}
if (StringUtils.isEmpty(passwordString)) {
iotdbPassword.setText(AppConstant.DEFAULT_PASSWORD);
}
return true;
}
private IotDBProperties createIo
tDBProperties() {
String ipString = iotdbIp.getText();
String portString = iotdbPort.getText();
String usernameString = iotdbUsername.getText();
String passwordString = iotdbPassword.getText();
IotDBProperties iotDBProperties = new IotDBProperties();
iotDBProperties.setIp(ipString);
iotDBProperties.setPort(portString);
iotDBProperties.setUsername(usernameString);
iotDBProperties.setPassword(passwordString);
return iotDBProperties;
}
private boolean checkCanConnectionTODB(IotDBProperties iotDBProperties) {
return true;
}
}
MainController
package com.hy.java.gui.javafx.iotdb.controller;
import java.net.URL;
import java.util.ResourceBundle;
import com.hy.java.gui.javafx.iotdb.pojo.MeasurementPointData;
import com.sun.javafx.scene.control.skin.LabeledText;
import javafx.collections.ObservableList;
import javafx.event.EventTarget;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.ListView;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
/**
@author hy
@createTime 2021-07-25 17:08:29
@description 主要查看 iotdb 数据的地方
*/
public class MainController implements Initializable {
@FXML
ListView<String> storageGroupList; // 左边显示存储组
@FXML
TableView<MeasurementPointData> mpInfo; // 右边存放 mpInfo 的信息
@Override
public void initialize(URL arg0, ResourceBundle arg1) {
// TODO Auto-generated method stub
// SimpleListProperty<String> storageGroupDatas=new
// SimpleListProperty<String>();
ObservableList<String> items = storageGroupList.getItems();
items.add("root.test.machine");
items.add("root.test.machine1");
// 开始获取当前的 table 中的数据，必须通过点击事件获取，例如点击左边的测点
storageGroupList.setOnMouseClicked((event) -> {
// System.out.println("listView==>event=" + event);
EventTarget target = event.getTarget();
System.out.println(target);
// 这里不能执行强制类型转换操作，由于字节码文件不支持(54,而当前为 52)
if (target == null) {
return;
}
if (target instanceof LabeledText) {
LabeledText clickLabeledText = (LabeledText) target;
String text = clickLabeledText.getText();
System.out.println("获取当前点击的目标存储组为：" + text);
// 下面这里可能从 iotdb 中获取实际的数据，并加载数据到 TableView
setMpDataFromDB(text);
}
});
ObservableList<TableColumn<MeasurementPointData, ?>> columns = mpInfo.getColumns();
columns.clear();
// 开始将列的值与当前的 javabean 的属性进行绑定
TableColumn<MeasurementPointData, Object> columne1 = new TableColumn<MeasurementPointData, Object>("测点名称");
TableColumn<MeasurementPointData, Object> columne2 = new TableColumn<MeasurementPointData, Object>("时间");
TableColumn<MeasurementPointData, Object> columne3 = new TableColumn<MeasurementPointData, Object>("值");
columne1.setCellValueFactory(new PropertyValueFactory<MeasurementPointData, Object>("mpName"));
columne2.setCellValueFactory(new PropertyValueFactory<MeasurementPointData, Object>("timestamp"));
columne3.setCellValueFactory(new PropertyValueFactory<MeasurementPointData, Object>("value"));
columns.add(columne1);
columns.add(columne2);
columns.add(columne3);
}
private void setMpDataFromDB(String storageGroupName) {
// 这里应该从 iotdb 数据库中加载数据
ObservableList<MeasurementPointData> items = mpInfo.getItems();
items.clear();
MeasurementPointData mpData = new MeasurementPointData();
mpData.setMpName("root.test.machine.value");
mpData.setTimestamp("1");
mpData.setValue("999");
items.add(mpData);
System.out.println(items);
}
}
2.程序常量类和 pojo 类和 properties 类
package com.hy.java.gui.javafx.iotdb;
import javafx.stage.Stage;
/**
@author hy
@createTime 2021-07-25 13:49:05
@description 定义系统运行中的常量部分
*/
public abstract class AppConstant {
public static final String DEFAULT_IP = "localhost";
public static final int DEFAULT_PORT = 6667;
public static final String DEFAULT_USERNAME = "root";
public static final String DEFAULT_PASSWORD = "root";
//public static final String LOGIN_RESOURCE_LOCATION="";
//public static final String MAIN_RESOURCE_LOCATION="../main";
public static Stage loginStage;
public static Stage mainStage;
}
package com.hy.java.gui.javafx.iotdb.pojo;
import javafx.beans.property.SimpleStringProperty;
public class MeasurementPointData {
private String mpName;
private String timestamp;
private String value;
// 省略 getset 之类的方法
}
package com.hy.java.gui.javafx.iotdb.properties;
public class IotDBProperties {
private String ip;
private String port;
private String username;
private String password;
// 省略 getset 之类的方法
}
3.各种工具类
package com.hy.java.gui.javafx.iotdb.utils;
import java.util.Optional;
import javafx.scene.control.Alert;
import javafx.scene.control.ButtonType;
import javafx.scene.control.Alert.AlertType;
public abstract class MsgUtils {
public static void alert(AlertType alertType, String title, String msg) {
Alert alert = new Alert(alertType, msg, ButtonType.YES, ButtonType.NO);
alert.setTitle(title);
alert.setHeaderText("");
Optional<ButtonType> showAndWait = alert.showAndWait();
if (showAndWait.get() == ButtonType.YES) {
alert.close();
}
}
}
package com.hy.java.gui.javafx.iotdb.utils;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public abstract class NumberUtils {
private static final String INT_STRING_REGEX = "^\d+$";
private static final Pattern INT_STRING_PATTERN = Pattern.compile(INT_STRING_REGEX);
public static boolean isIntNum(String text) {
Matcher matcher = INT_STRING_PATTERN.matcher(text);
return matcher.matches();
}
}
package com.hy.java.gui.javafx.iotdb.utils;
public abstract class StringUtils {
public static boolean isEmpty(String text) {
if (text == null || "".equals(text.trim())) {
return true;
}
return false;
}
}
实际入口类
package com.hy.java.gui.javafx.iotdb;
import javafx.application.Application;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class IotdbJavaFxApplication extends Application {
@Override
public void start(Stage stage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("resources/login.fxml"));
Scene scene = new Scene(root, 500, 450);
stage.setTitle("iotdb view login");
stage.setScene(scene);
stage.setOnShown(new EventHandler() {
@Override
public void handle(Event event) {
// TODO Auto-generated method stub
System.out.println("event=" + event);
}
});
AppConstant.loginStage = stage;
stage.show();
}
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