【Vaadin flow 实战】第5讲-使用常用UI组件绘制页面元素

vaadin flow官方提供的UI组件文档地址是

https://vaadin.com/docs/latest/components

这里，我简单实战了官方提供的一些免费的UI组件，使用案例如下：

Accordion 手风琴

Accordion 手风琴效果组件

Accordion 手风琴-测试案例代码

@Slf4j
@PageTitle("HelpViewPage")
@Route(value = "helpView",layout = MainLayout.class)
@Menu(order = 5, icon = LineAwesomeIconUrl.FILE)
public class HelpView extends VerticalLayout{public HelpView() {Span s1 = new Span("手风琴");Accordion accordion = displayAccordion();add(s1,accordion);}private Accordion displayAccordion(){Accordion accordion = new Accordion();Span name = new Span("Sophia Williams");Span email = new Span("sophia.williams@company.com");Span phone = new Span("(501) 555-9128");VerticalLayout accordionItemLayout = new VerticalLayout(name,email, phone);accordionItemLayout.setSpacing(false);accordionItemLayout.setPadding(false);accordion.add("Personal information", accordionItemLayout);Span name2 = new Span("4027 Amber Lake Canyon");Span email2 = new Span("72333-5884 Cozy Nook");Span phone2 = new Span("Arkansas");VerticalLayout accordionItemLayout2 = new VerticalLayout(name2, email2, phone2);accordionItemLayout2.setSpacing(false);accordionItemLayout2.setPadding(false);accordion.add("Billing Address", accordionItemLayout2);return accordion;}
}

Avatar 头像

Avatar 头像

Avatar 头像-测试案例代码

@Slf4j
@PageTitle("HelpViewPage")
@Route(value = "helpView",layout = MainLayout.class)
@Menu(order = 5, icon = LineAwesomeIconUrl.FILE)
public class HelpView extends VerticalLayout{public HelpView() {Span s2 = new Span("Avatar 头像");Avatar avatarBasic = new Avatar();Avatar avatarName = new Avatar("TEST");AvatarGroup avatarGroup = new AvatarGroup();for (Country country : getCountries()) {String name = country.getName();AvatarGroup.AvatarGroupItem avatar = new AvatarGroup.AvatarGroupItem(name);avatarGroup.add(avatar);}Avatar userAvatar = new Avatar();userAvatar.setImage("https://images.unsplash.com/photo-1519681393784-d120267933ba?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=750&q=80");add(s2,avatarBasic, avatarName,avatarGroup,userAvatar);}}

Badge 徽章

Badge 徽章-测试案例代码

@Slf4j
@PageTitle("HelpViewPage")
@Route(value = "helpView",layout = MainLayout.class)
@Menu(order = 5, icon = LineAwesomeIconUrl.FILE)
public class HelpView extends VerticalLayout{public HelpView() {Span s3 = new Span("Badge 徽章");Span pending = new Span("Pending");pending.getElement().getThemeList().add("badge");Span confirmed = new Span("Confirmed");confirmed.getElement().getThemeList().add("badge success");Span denied = new Span("Denied");denied.getElement().getThemeList().add("badge error");Span onHold = new Span("On hold");onHold.getElement().getThemeList().add("badge contrast");HorizontalLayout hLayout = new HorizontalLayout(pending, confirmed, denied, onHold);// Icon before textSpan pending1 = new Span(createIcon(VaadinIcon.CLOCK),new Span("Pending"));pending1.getElement().getThemeList().add("badge");
// Icon after textSpan pending2 = new Span(new Span("Pending"),createIcon(VaadinIcon.CLOCK));pending2.getElement().getThemeList().add("badge");HorizontalLayout h2Layout = new HorizontalLayout(pending1, pending2);add(s3,hLayout,h2Layout);}}

Button 按钮

Button 按钮-测试案例代码

@Slf4j
@PageTitle("HelpViewPage")
@Route(value = "helpView",layout = MainLayout.class)
@Menu(order = 5, icon = LineAwesomeIconUrl.FILE)
public class HelpView extends VerticalLayout{public HelpView() {Span s4 = new Span("Button");Button primaryButton = new Button("Primary");primaryButton.addThemeVariants(ButtonVariant.LUMO_PRIMARY);Button secondaryButton = new Button("Secondary");Button tertiaryButton = new Button("Tertiary");tertiaryButton.addThemeVariants(ButtonVariant.LUMO_TERTIARY);HorizontalLayout h3Layout = new HorizontalLayout(primaryButton, secondaryButton,tertiaryButton);Button primaryButton2 = new Button("Primary");primaryButton2.addThemeVariants(ButtonVariant.LUMO_PRIMARY, ButtonVariant.LUMO_ERROR);Button secondaryButton2 = new Button("Secondary");secondaryButton2.addThemeVariants(ButtonVariant.LUMO_ERROR);Button tertiaryButton2 = new Button("Tertiary");tertiaryButton2.addThemeVariants(ButtonVariant.LUMO_TERTIARY, ButtonVariant.LUMO_ERROR);HorizontalLayout h4Layout = new HorizontalLayout(primaryButton2, secondaryButton2,tertiaryButton2);Button primaryButton3 = new Button("Primary");primaryButton3.addThemeVariants(ButtonVariant.LUMO_PRIMARY,ButtonVariant.LUMO_WARNING);Button secondaryButton3 = new Button("Secondary");secondaryButton3.addThemeVariants(ButtonVariant.LUMO_WARNING);Button tertiaryButton3 = new Button("Tertiary");tertiaryButton3.addThemeVariants(ButtonVariant.LUMO_TERTIARY,ButtonVariant.LUMO_WARNING);HorizontalLayout h5Layout = new HorizontalLayout(primaryButton3, secondaryButton3,tertiaryButton3);Button largeButton = new Button("Large");largeButton.addThemeVariants(ButtonVariant.LUMO_LARGE);Button normalButton = new Button("Normal");Button smallButton = new Button("Small");smallButton.addThemeVariants(ButtonVariant.LUMO_SMALL);HorizontalLayout h6Layout = new HorizontalLayout(largeButton, normalButton,smallButton);add(s4,h3Layout,h4Layout,h5Layout,h6Layout);}}

CheckboxGroup 多选框

CheckboxGroup 多选框-测试案例代码

@Slf4j
@PageTitle("HelpViewPage")
@Route(value = "helpView",layout = MainLayout.class)
@Menu(order = 5, icon = LineAwesomeIconUrl.FILE)
public class HelpView extends VerticalLayout{public HelpView() {Span s5 = new Span("CheckboxGroup-demo");CheckboxGroup<String> checkboxGroup = new CheckboxGroup<>();checkboxGroup.setLabel("Export data");checkboxGroup.setItems("Order ID", "Product name", "Customer","Status");checkboxGroup.select("Order ID", "Customer");checkboxGroup.addThemeVariants(CheckboxGroupVariant.LUMO_VERTICAL);// 添加值改变事件监听器checkboxGroup.addValueChangeListener(event -> {// 处理选择的值Set<String> selectedValues = event.getValue();// 这里可以添加逻辑，比如更新 UI 或处理数据log.info("选中的checkbox:{}",selectedValues.toString());});add(s5,checkboxGroup);}}

ComboBox 组合框(下拉框)

ComboBox 组合框-测试案例代码

@Slf4j
@PageTitle("HelpViewPage")
@Route(value = "helpView",layout = MainLayout.class)
@Menu(order = 5, icon = LineAwesomeIconUrl.FILE)
public class HelpView extends VerticalLayout{public HelpView() {Span s6 = new Span("ComboBox");ComboBox<Country> countryComboBox = new ComboBox<>("Select Country");countryComboBox.setItems(getCountries()); // 设置 ComboBox 的项countryComboBox.setItemLabelGenerator(Country::getName); // 用于前端显示的标签// 监听选项变化countryComboBox.addValueChangeListener(event -> {Country selectedCountry = event.getValue();if (selectedCountry != null) {Long selectedId = selectedCountry.getId(); // 获取 ID// 在这里可以处理 ID，如存储到数据库等log.info("Selected country id: {}", selectedId);Notification.show("选中了"+selectedCountry.getName());}});add(s6,countryComboBox);}}

ConfirmDialog 对话框

ConfirmDialog 对话框-测试案例代码

@Slf4j
@PageTitle("HelpViewPage")
@Route(value = "helpView",layout = MainLayout.class)
@Menu(order = 5, icon = LineAwesomeIconUrl.FILE)
public class HelpView extends VerticalLayout{public HelpView() {Span s7 = new Span("ConfirmDialog");//demo1 删除确认Button deleteButton = new Button("删除项");// 添加按钮点击事件deleteButton.addClickListener(event -> {// 创建确认对话框ConfirmDialog dialog = new ConfirmDialog();dialog.setHeader("确认");dialog.setText("您确定要删除该项吗？");// 设置确认按钮的事件dialog.setCancelable(true);dialog.setConfirmText("确认");dialog.setConfirmButtonTheme("error primary");dialog.setCancelText("取消");dialog.addConfirmListener(confirmEvent -> {// 处理确认事件log.info("确认删除");Notification.show("项已删除!");});dialog.addCancelListener(cancelEvent -> {// 处理取消事件log.info("操作已取消");Notification.show("操作已取消!");});// 显示对话框dialog.open();});//demo2 使用建议Button recommendButton = new Button("提示");recommendButton.addClickListener(event -> {ConfirmDialog dialog = new ConfirmDialog();dialog.setHeader("导出失败");dialog.setText(new Html("<p>导出报告Q4时出错。请重试，如果问题仍然存在，请联系 <a href=\"mailto:support@company.com\">support@company.com</a></p>"));dialog.setConfirmText("我知道了");dialog.addConfirmListener(confirmEvent -> {// 处理确认事件log.info("我知道了");Notification.show("我知道了!");});// 显示对话框dialog.open();});//demo3 拒绝按钮Button rejectButton = new Button("拒绝保存");rejectButton.addClickListener(event -> {ConfirmDialog dialog = new ConfirmDialog();dialog.setHeader("未保存的更改");dialog.setText("您想在导航离开之前放弃或保存更改吗");dialog.setCancelable(true);dialog.setCancelText("取消");dialog.addCancelListener(cancelEvent -> {// 处理取消事件log.info("操作已取消");Notification.show("操作已取消!");});dialog.setRejectable(true);dialog.setRejectText("丢弃变更");dialog.setConfirmText("保存变更");// 显示对话框dialog.open();});add(s7,deleteButton,recommendButton,rejectButton);}}

DatePicker 日期选择

DatePicker 日期选择-测试案例代码

@Slf4j
@PageTitle("HelpViewPage")
@Route(value = "helpView",layout = MainLayout.class)
@Menu(order = 5, icon = LineAwesomeIconUrl.FILE)
public class HelpView extends VerticalLayout{public HelpView() {Span s8 = new Span("DatePicker");DatePicker datePicker = new DatePicker("选择日期");datePicker.setLabel("选择一个日期");// 设置日期格式datePicker.setI18n(new DatePicker.DatePickerI18n().setCancel("取消").setToday("今天").setMonthNames(List.of("一月", "二月", "三月", "四月", "五月", "六月","七月", "八月", "九月", "十月", "十一月", "十二月")));// 添加监听器以捕获日期选择事件datePicker.addValueChangeListener(event -> {// 获取选择的日期LocalDate date = event.getValue();log.info("选择的日期:{}",date.toString());});add(s8,datePicker);}}

DateTimePicker 日期时间选择

DateTimePicker 日期时间选择-测试案例代码

@Slf4j
@PageTitle("HelpViewPage")
@Route(value = "helpView",layout = MainLayout.class)
@Menu(order = 5, icon = LineAwesomeIconUrl.FILE)
public class HelpView extends VerticalLayout{public HelpView() {Span s9 = new Span("DateTimePicker");DateTimePicker dateTimePicker = new DateTimePicker("选择日期和时间");// 可以设置默认值dateTimePicker.setValue(LocalDateTime.now());// 你可以为选择事件添加监听器dateTimePicker.addValueChangeListener(event -> {LocalDateTime selectedDateTime = event.getValue();System.out.println("选择的日期时间: " + selectedDateTime);});add(s9,dateTimePicker);}}

TimePicker 时间选择

TimePicker 时间选择-测试案例代码

@Slf4j
@PageTitle("HelpViewPage")
@Route(value = "helpView",layout = MainLayout.class)
@Menu(order = 5, icon = LineAwesomeIconUrl.FILE)
public class HelpView extends VerticalLayout{public HelpView() {Span s010 = new Span("TimePicker");TimePicker timePicker = new TimePicker();timePicker.setLabel("Meeting time");timePicker.setStep(Duration.ofMinutes(30));timePicker.setValue(LocalTime.of(12, 30));add(s010,timePicker);}}

Dialog 弹窗

Dialog 弹窗-测试案例代码

@Slf4j
@PageTitle("HelpViewPage")
@Route(value = "helpView",layout = MainLayout.class)
@Menu(order = 5, icon = LineAwesomeIconUrl.FILE)
public class HelpView extends VerticalLayout{public HelpView() {Span s10 = new Span("Dialog");Button showDialogButton = new Button("new弹窗");showDialogButton.addClickListener(event -> {Dialog dialog = new Dialog();dialog.setWidth("368px");dialog.setHeaderTitle("New employee");TextField tf1 = new TextField("First Name");tf1.setWidth("276px");TextField tf2 = new TextField("Last Name");tf2.setWidth("276px");VerticalLayout layout = new VerticalLayout();layout.add(tf1,tf2);dialog.add(layout);Button saveButton = new Button("Save",e->{String value = tf1.getValue();if (StringUtils.isEmpty(value)) {Notification.show("First Name 不能为空!");}else {s10.setText(value);// 关闭对话框dialog.close();}});saveButton.addThemeVariants(ButtonVariant.LUMO_PRIMARY);Button cancelButton = new Button("Cancel", e -> dialog.close());dialog.getFooter().add(cancelButton);dialog.getFooter().add(saveButton);// 显示对话框dialog.open();});Button openDialogButton = new Button("view弹窗", event -> openDialog());add(s10,showDialogButton,openDialogButton);}private void openDialog() {Dialog dialog = new Dialog();dialog.setWidth("388px"); // 设置弹窗宽度// 创建输入框TextField nameField = new TextField("Name", "Enter your name");nameField.setWidth("300px");nameField.setValue("test");nameField.setReadOnly(true);TextField emailField = new TextField("Email", "Enter your email");emailField.setWidth("300px");emailField.setValue("efdxuwef@163.com");emailField.setReadOnly(true);TextField addressField = new TextField("Address", "Enter your address");addressField.setWidth("300px");addressField.setValue("4188 Crystal Orchard, Mousie, USA");addressField.setReadOnly(true);VerticalLayout layout = new VerticalLayout();layout.add(nameField);layout.add(emailField);layout.add(addressField);// 添加输入框到对话框dialog.add(layout);dialog.setHeaderTitle("User details");Button closeButton = new Button(new Icon("lumo", "cross"),(e) -> dialog.close());closeButton.addThemeVariants(ButtonVariant.LUMO_TERTIARY);dialog.getHeader().add(closeButton);dialog.open();}
}

Input 各种输入窗

Input 各种输入窗-测试案例代码，需要在自定义css文件里配置css ,然后在Java中声明使用的组件css

.password-strength-week{color: red;
}.password-strength-moderate{color: yellowgreen;
}.password-strength-strong{color: darkgreen;
}

@Slf4j
@PageTitle("HelpViewPage")
@Route(value = "helpView",layout = MainLayout.class)
@Menu(order = 5, icon = LineAwesomeIconUrl.FILE)
public class HelpView extends VerticalLayout{public HelpView() {Span s11 = new Span("各种输入窗");EmailField validEmailField = new EmailField();validEmailField.setLabel("Email address");validEmailField.getElement().setAttribute("name", "email");validEmailField.setValue("julia@email.com");validEmailField.setErrorMessage("Enter a valid email address");validEmailField.setPrefixComponent(VaadinIcon.ENVELOPE.create());validEmailField.setClearButtonVisible(true);NumberField dollarField = new NumberField();dollarField.setLabel("Balance");dollarField.setValue(200.0);Div dollarPrefix = new Div();dollarPrefix.setText("$");dollarField.setPrefixComponent(dollarPrefix);dollarField.setClearButtonVisible(true);IntegerField integerField = new IntegerField();integerField.setLabel("Quantity");integerField.setHelperText("Max 10 items");integerField.setRequiredIndicatorVisible(true);integerField.setMin(1);integerField.setMax(10);integerField.setValue(2);integerField.setStepButtonsVisible(true);integerField.setI18n(new IntegerField.IntegerFieldI18n().setRequiredErrorMessage("Field is required").setBadInputErrorMessage("Invalid number format").setMinErrorMessage("Quantity must be at least 1").setMaxErrorMessage("Maximum 10 items available"));BigDecimalField bigDecimalField = new BigDecimalField();bigDecimalField.setLabel("Result");bigDecimalField.setWidth("240px");bigDecimalField.setValue(new BigDecimal("948205817.472950487"));IntegerField xField = new IntegerField();xField.setLabel("X");xField.setValue(-1284);NumberField numberField = new NumberField();numberField.setLabel("Duration (hours)");numberField.setStep(0.5);numberField.setValue(12.5);numberField.setStepButtonsVisible(true);numberField.setI18n(new NumberField.NumberFieldI18n().setBadInputErrorMessage("Invalid number format").setStepErrorMessage("Duration must be a multiple of 0.5"));PasswordField passwordField1 = new PasswordField();passwordField1.setLabel("Password");passwordField1.setValue("Ex@mplePassw0rd");passwordField1.setClearButtonVisible(true);passwordField1.setPrefixComponent(VaadinIcon.LOCK.create());HorizontalLayout layout = new HorizontalLayout();
//        layout.setPadding(true);layout.add(validEmailField);layout.add(dollarField);layout.add(integerField);layout.add(bigDecimalField);layout.add(xField);layout.add(numberField);layout.add(passwordField1);PasswordField passwordField = new PasswordField();passwordField.setLabel("Password2");Icon checkIcon = VaadinIcon.CHECK.create();checkIcon.setVisible(false);checkIcon.getStyle().set("color", "var(--lumo-success-color)");passwordField.setSuffixComponent(checkIcon);Div passwordStrength = new Div();Span passwordStrengthText = new Span("week");passwordStrengthText.setClassName("password-strength-week");passwordStrength.add(new Text("Password strength: "),passwordStrengthText);passwordField.setHelperComponent(passwordStrength);passwordField.setClearButtonVisible(false);passwordField.setValueChangeMode(ValueChangeMode.EAGER); //设置实时监听passwordField.addValueChangeListener(event -> {String value = event.getValue();log.info("ValueChangeListener value: {}" , value);if (value.length() <= 3) {checkIcon.setVisible(false);passwordStrengthText.setText("week");passwordStrengthText.setClassName("password-strength-week"); //使用了外部自定义CSS}if (value.length() >3 && value.length() <= 6) {checkIcon.setVisible(false);passwordStrengthText.setText("moderate");passwordStrengthText.setClassName("password-strength-moderate"); //使用了外部自定义CSS}if (value.length() >6 && value.length() <= 9) {passwordStrengthText.setText("strong");passwordStrengthText.setClassName("password-strength-strong"); //使用了外部自定义CSScheckIcon.setVisible(true);}});TextField textField = new TextField();textField.setLabel("Street Address");textField.setValue("Ruukinkatu 2");textField.setClearButtonVisible(true);textField.setPrefixComponent(VaadinIcon.MAP_MARKER.create());TextField phoneField = new TextField("Phone number");phoneField.setRequiredIndicatorVisible(true);phoneField.setPattern("^[+]?[\\(]?[0-9]{3}[\\)]?[\\-]?[0-9]{3}[\\-]?[0-9]{4,6}$");phoneField.setAllowedCharPattern("[0-9()+-]");phoneField.setMinLength(5);phoneField.setMaxLength(18);phoneField.setHelperText("Format: +(123)456-7890");phoneField.setI18n(new TextField.TextFieldI18n().setRequiredErrorMessage("Field is required").setMinLengthErrorMessage("Minimum length is 5 characters").setMaxLengthErrorMessage("Maximum length is 18 characters").setPatternErrorMessage("Invalid phone number format"));TextArea textArea = new TextArea();textArea.setLabel("Comment");textArea.setMaxLength(150);textArea.setValueChangeMode(ValueChangeMode.EAGER);textArea.addValueChangeListener(e -> {e.getSource().setHelperText(e.getValue().length() + "/" + 150);});textArea.setValue("Great job. This is excellent!");TextField findField = new TextField();findField.setPlaceholder("Search");findField.setPrefixComponent(new Icon("lumo", "search"));findField.setTooltipText("Wrap in “quotes” for exact phrase");add(s11,layout,passwordField,textField,phoneField,textArea,findField);}}

TabSheet 选项卡

TabSheet 选项卡-测试代码案例

@Slf4j
@PageTitle("HelpViewPage")
@Route(value = "helpView",layout = MainLayout.class)
@Menu(order = 5, icon = LineAwesomeIconUrl.FILE)
public class HelpView extends VerticalLayout{public HelpView() {TabSheet tabSheet = new TabSheet();tabSheet.add("Dashboard",new Div(new Text("This is the Dashboard tab content")));tabSheet.add("Payment",new Div(new Text("This is the Payment tab content")));tabSheet.add("Shipping",new Div(new Text("This is the Shipping tab content")));add(tabSheet);}
}

RadioButtonGroup 单选按钮组

RadioButtonGroup 单选按钮组-测试代码案例

@Slf4j
@PageTitle("HelpViewPage")
@Route(value = "helpView",layout = MainLayout.class)
@Menu(order = 5, icon = LineAwesomeIconUrl.FILE)
public class HelpView extends VerticalLayout{public HelpView() {RadioButtonGroup<String> radioGroup = new RadioButtonGroup<>();radioGroup.addThemeVariants(RadioGroupVariant.LUMO_VERTICAL);radioGroup.setLabel("Travel class");radioGroup.setItems("Economy", "Business", "First Class");radioGroup.addValueChangeListener(event -> {String value = event.getValue();log.info("RadioButtonGroup ValueChangeListener value: {}" , value);});add(radioGroup);
}
}

ProgressBar 进度条

ProgressBar 进度条-测试代码案例

@Slf4j
@PageTitle("HelpViewPage")
@Route(value = "helpView",layout = MainLayout.class)
@Menu(order = 5, icon = LineAwesomeIconUrl.FILE)
public class HelpView extends VerticalLayout{public HelpView() {
ProgressBar progressBar = new ProgressBar();progressBar.setValue(0.5);ProgressBar progressBar2 = new ProgressBar();progressBar2.setIndeterminate(true);// ContrastProgressBar progressBarContrast = new ProgressBar();progressBarContrast.addThemeVariants(ProgressBarVariant.LUMO_CONTRAST);progressBarContrast.setValue(0.5);// SuccessProgressBar progressBarSuccess = new ProgressBar();progressBarSuccess.addThemeVariants(ProgressBarVariant.LUMO_SUCCESS);progressBarSuccess.setValue(0.75);// ErrorProgressBar progressBarError = new ProgressBar();progressBarError.addThemeVariants(ProgressBarVariant.LUMO_ERROR);progressBarError.setValue(0.2);add(progressBar,progressBar2,progressBarContrast,progressBarSuccess,progressBarError);ProgressBar progressBarExport = new ProgressBar();progressBarExport.setIndeterminate(true);// Associates the labels with the bar programmatically, for screen
// readers:progressBarExport.getElement().setAttribute("aria-labelledby", "pblbl");progressBarExport.getElement().setAttribute("aria-describedby", "sublbl");NativeLabel progressBarLabel = new NativeLabel("Generating report...");progressBarLabel.setId("pblbl");progressBarLabel.addClassName(LumoUtility.TextColor.SECONDARY);Span progressBarSubLabel = new Span("Process can take upwards of 10 minutes");progressBarSubLabel.setId("sublbl");progressBarSubLabel.addClassNames(LumoUtility.TextColor.SECONDARY, LumoUtility.FontSize.XSMALL);add(progressBarLabel, progressBarExport, progressBarSubLabel);}}

MultiSelectComboBox 多选下拉框

MultiSelectComboBox 多选下拉框-测试代码案例

@Slf4j
@PageTitle("HelpViewPage")
@Route(value = "helpView",layout = MainLayout.class)
@Menu(order = 5, icon = LineAwesomeIconUrl.FILE)
public class HelpView extends VerticalLayout{public HelpView() {Span s16 = new Span("MultiSelectComboBox demo");MultiSelectComboBox<Country> comboBox = new MultiSelectComboBox<>("Countries");comboBox.setItems(getCountries());comboBox.setItemLabelGenerator(Country::getName);comboBox.addValueChangeListener(event -> {Set<Country> countrySet =  event.getValue();log.info("countrySet: {}", countrySet);});add(s16,comboBox);
}
}

MessageInput 消息输入框

MessageInput 消息输入框-测试代码案例

@Slf4j
@PageTitle("HelpViewPage")
@Route(value = "helpView",layout = MainLayout.class)
@Menu(order = 5, icon = LineAwesomeIconUrl.FILE)
public class HelpView extends VerticalLayout{public HelpView() {
MessageInput input = new MessageInput();input.addSubmitListener(submitEvent -> {Notification.show("Message received: " + submitEvent.getValue(),3000, Notification.Position.MIDDLE);});add(input);}}

Notification 通知

Notification 通知–测试代码案例

Span s18 = new Span("Notification demo");Button toast1 = new Button("toast1", event -> {// When creating a notification using the `show` static method,
// the duration is 5-sec by default.Notification.show("Financial report generated");});Button toast2 = new Button("toast2", event -> {Notification notification = Notification.show("Application submitted!");notification.addThemeVariants(NotificationVariant.LUMO_SUCCESS);});Button toast3 = new Button("toast3",evt -> {Notification notification = new Notification();notification.addThemeVariants(NotificationVariant.LUMO_WARNING);Div text = new Div(new Text("Your session will expire in 5 minutes due to inactivity."),new HtmlComponent("br"),new Text("Close this warning to continue working."));Button closeButton = new Button(new Icon("lumo", "cross"));closeButton.addThemeVariants(ButtonVariant.LUMO_TERTIARY_INLINE);closeButton.setAriaLabel("Close");closeButton.addClickListener(event -> {notification.close();});HorizontalLayout layoutH = new HorizontalLayout(text, closeButton);layoutH.setAlignItems(Alignment.CENTER);notification.add(layoutH);notification.open();});Button toast4 = new Button("toast4",evt -> {Notification notification = new Notification();notification.addThemeVariants(NotificationVariant.LUMO_ERROR);Div text = new Div(new Text("Failed to generate report"));Button closeButton = new Button(new Icon("lumo", "cross"));closeButton.addThemeVariants(ButtonVariant.LUMO_TERTIARY_INLINE);closeButton.setAriaLabel("Close");closeButton.addClickListener(event -> {notification.close();});HorizontalLayout layoutH = new HorizontalLayout(text, closeButton);layoutH.setAlignItems(Alignment.CENTER);notification.add(layoutH);notification.open();});add(s18,toast1,toast2,toast3,toast4);

MultiSelectListBox 列表框

MultiSelectListBox 列表框-测试代码案例

//列表框允许用户从可滚动的项目列表中选择一个或多个值Span s19 = new Span("MultiSelectListBox demo");MultiSelectListBox<Country> listBox = new MultiSelectListBox<>();listBox.setItems(getCountries());listBox.select(getCountries().get(0), getCountries().get(3));listBox.setHeight("200px");listBox.setClassName("lstbox"); //这里使用了自定义CSS文件中的CSS类名listBox.setTooltipText("this is a listbox");// 设置展示给用户的名称listBox.setItemLabelGenerator(Country::getName);// 添加一个值改变监听器listBox.addValueChangeListener(event -> {String selectedCountries = event.getValue().stream().map(Country::getName).reduce((a, b) -> a + ", " + b).orElse("No countries selected");Notification.show(selectedCountries);});add(s19,listBox);

对应的自定义CSS配置

绘制自定义卡片

测试代码案例, 需要在自定义css文件里配置css ,然后在Java中声明使用的组件css

.card {transition: transform 0.2s;
}.card:hover {transform: scale(1.05);
}

 Div card = new Div();card.setClassName("card"); //使用的自定义csscard.getElement().getStyle().set("border", "1px solid #ccc");card.getElement().getStyle().set("border-radius", "5px");card.getElement().getStyle().set("padding", "16px");card.getElement().getStyle().set("width", "300px");card.getElement().getStyle().set("box-shadow", "0 4px 8px rgba(0,0,0,0.1)");// 添加标题H3 title = new H3("Card Title");card.add(title);// 添加图片
//        Image image = new Image("https://via.placeholder.com/300", "Placeholder image");Image image = new Image("https://images.unsplash.com/photo-1512273222628-4daea6e55abb?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=750&q=80", "Placeholder image");image.setWidth("300px");card.add(image);// 添加按钮Button button = new Button("Click me");card.add(button);add(card);

FormLayout 表单布局

测试代码案例

Span fSpan = new Span("FormLayout demo");TextField firstName = new TextField("First name");TextField lastName = new TextField("Last name");TextField username = new TextField("Username");PasswordField password = new PasswordField("Password");PasswordField confirmPassword = new PasswordField("Confirm password");FormLayout formLayout = new FormLayout();formLayout.add(firstName, lastName, username, password, confirmPassword);formLayout.setResponsiveSteps(// Use one column by defaultnew FormLayout.ResponsiveStep("0", 1),// Use two columns, if layout's width exceeds 500pxnew FormLayout.ResponsiveStep("500px", 2));
// Stretch the username field over 2 columnsformLayout.setColspan(username, 2);add(fSpan,formLayout);

Upload 文件上传组件

测试代码案例

Span sSpan = new Span("Upload demo");MultiFileMemoryBuffer buffer = new MultiFileMemoryBuffer();Upload upload = new Upload(buffer);//限制上传文件格式//  upload.setAcceptedFileTypes("application/pdf", ".pdf");//默认情况下，“上传”不限制可以上传的文件数量。但是，您可以设置文件计数限制upload.setMaxFiles(3);//设置最大字节数来限制文件大小。但默认情况下，没有限制// 10MBint maxFileSizeInBytes = 10 * 1024 * 1024;upload.setMaxFileSize(maxFileSizeInBytes);upload.addSucceededListener(event -> {String fileName = event.getFileName();log.info("fileName:{}", fileName);String mainName = FileNameUtil.mainName(fileName);log.info("file mainName:{}", mainName);String extName = FileNameUtil.extName(fileName);log.info("file extName:{}", extName);InputStream in = buffer.getInputStream(fileName);// Do something with the file data// processFile(inputStream, fileName);BufferedOutputStream out = FileUtil.getOutputStream("/Users/xxx/Documents/"+fileName);long copySize = IoUtil.copy(in, out, IoUtil.DEFAULT_BUFFER_SIZE);System.err.println(copySize);IoUtil.closeIfPosible(in);IoUtil.closeIfPosible(out);});upload.addFileRejectedListener(event -> {String errorMessage = event.getErrorMessage();Notification notification = Notification.show(errorMessage, 5000,Notification.Position.MIDDLE);notification.addThemeVariants(NotificationVariant.LUMO_ERROR);});add(sSpan,upload);

Image 图片展示组件

测试代码案例

//        Image imageTest = new Image("images/empty-plant.png", "My Alt Image");Image imageTest = new Image("https://images.unsplash.com/photo-1519681393784-d120267933ba?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=750&q=80", "My Alt Image");SvgIcon svgIcon = new SvgIcon();svgIcon.setSrc("icons/hellokitty_1.svg");SvgIcon svgIcon2 = new SvgIcon();svgIcon2.setSrc("icons/hellokitty.svg");SvgIcon svgIcon3 = new SvgIcon();svgIcon3.setSrc("icons/hello.svg");add(imageTest,svgIcon,svgIcon2,svgIcon3);