• 与Alert大部分功能类似
• 可以自定义弹出框内容，比较灵活
• 与DialogPane布局配合使用，自定义具体内容

参考DialogPane

常用属性

title

弹出框标题，标题太长会把超长部分截取，后面加上……

dialog.setTitle("标题");

initOwner

设置弹框的所有者，用于确定对话框的位置和模式

dialog.initOwner(stage);

dialogPane

获取 Alert 的内部 DialogPane，允许进一步定制对话框的布局和内容，其中最重要的是expandableContent

dialog.setDialogPane(dialogPane);

resultConverter

点击按钮返回结果组装

 dialog.setResultConverter(btnType -> {
     if (ButtonType.OK.equals(btnType)) {
            return null;
     }
     return null;
 });

实现方式

public static Parent demo1(Window owner) {
        FlowPane flowPane = new FlowPane();
        flowPane.setHgap(10);
        flowPane.setVgap(10);
        flowPane.setOrientation(Orientation.VERTICAL);
        Button button1 = new Button("demo1");
        button1.setOnMouseClicked((event) -> {
            if (MouseButton.PRIMARY.equals(event.getButton())) {
                createDialog(owner);
            }
        });
        flowPane.getChildren().add(button1);
        return flowPane;
    }

    public static void createDialog(Window owner) {
        DialogPane dialogPane = new DialogPane();
        dialogPane.setHeaderText("请输入用户密码：");
        dialogPane.setGraphic(new ImageView("icon.png"));

        GridPane grid = new GridPane();
        grid.setHgap(10);
        grid.setVgap(10);

        Label labelUname = new Label("用户名:");
        grid.add(labelUname, 0, 0);
        TextField txtUname = new TextField();
        txtUname.setPromptText("请输入用户名");
        grid.add(txtUname, 1, 0);

        Label labelPwd = new Label("密 码:");
        grid.add(labelPwd, 0, 1);
        PasswordField txtPwd = new PasswordField();
        txtPwd.setPromptText("请输入密码");
        grid.add(txtPwd, 1, 1);
        dialogPane.setContent(grid);

        // 设置按钮
        dialogPane.getButtonTypes().addAll(ButtonType.OK, ButtonType.CANCEL);

        TextArea textArea = new TextArea("展开显示详细内容");
        textArea.setEditable(true);
        textArea.setWrapText(true);
        textArea.setMaxWidth(Double.MAX_VALUE);
        textArea.setMaxHeight(Double.MAX_VALUE);
        dialogPane.setExpandableContent(textArea);
        dialogPane.setExpanded(false);

        Dialog<UserLoginDTO> dialog = new Dialog<UserLoginDTO>();
        dialog.setTitle("标题信息");
        dialog.setWidth(400);
        dialog.setHeight(300);
        dialog.initOwner(owner);
        dialog.setDialogPane(dialogPane);
        dialog.setResultConverter(btnType -> {
            if (ButtonType.OK.equals(btnType)) {
                String username = txtUname.getText();
                String password = txtPwd.getText();
                if (username.isEmpty() || password.isEmpty()) {
                    return null;
                } else {
                    UserLoginDTO userLoginDTO = new UserLoginDTO();
                    userLoginDTO.setUserName(username);
                    userLoginDTO.setPassword(password);
                    return userLoginDTO;
                }
            }
            return null;
        });
        Optional<UserLoginDTO> optional = dialog.showAndWait();
        optional.ifPresent((val) -> {
            System.out.println("uname->" + val.getUserName());
            System.out.println("pwd->" + val.getPassword());
        });
    }

    public static class UserLoginDTO {
        private String userName;
        private String password;

        public String getUserName() {
            return userName;
        }

        public void setUserName(String userName) {
            this.userName = userName;
        }

        public String getPassword() {
            return password;
        }

        public void setPassword(String password) {
            this.password = password;
        }
    }