组合框的休眠验证器答案

【问题标题】：Hibernate validator for ComboBox组合框的休眠验证器
【发布时间】：2016-07-16 12:57:24
【问题描述】：

如何验证 jComboBox 以供用户选择默认项目以外的任何项目？

我需要检查用户是否没有选择任何项目。所以 jComboBox 的值将是“请选择一个安全问题”

在我的模型类中，

@NotEmpty(message="Please fill the username field!")
public String getUsername() {
    return this.username;
}

public void setUsername(String username) {
    this.username = username;
}

@NotEmpty(message="Please fill the password field!")
public String getPassword() {
    return this.password;
}

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

public String getSeqQue() {
    return this.seqQue;
}

public void setSeqQue(String seqQue) {
    this.seqQue = seqQue;
}

在 getSeqQue() 中添加什么休眠验证器注释来验证我的 jComboBox？

【问题讨论】：

标签： java hibernate validation hibernate-validator

【解决方案1】：

要使用自定义消息验证您的 JComboBox，您可以制作自定义约束验证器。

参见以下示例：

MyModel.java

public class MyModel {

    @ValidComboBox //this is the annotation which validates your combo box
    private String question;

    //getter and setter
}

ValidComboBox.java //注解

import java.lang.annotation.*;
import javax.validation.*;

@Target({ ElementType.METHOD, ElementType.FIELD, ElementType.ANNOTATION_TYPE })
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = ComboBoxValidator.class)
@Documented
public @interface ValidComboBox {
String value = "Please select a security question";

String message() default "Please select a security question.";

Class<?>[]groups() default {};

Class<? extends Payload>[]payload() default {};
}

ComboBoxValidator.java

import javax.validation.*;
public class ComboBoxValidator implements ConstraintValidator<ValidComboBox, String> {

private String value;

@Override
public void initialize(ValidComboBox arg0) {
    this.value = arg0.value;

}

@Override
public boolean isValid(String question, ConstraintValidatorContext arg1) {
    if(question.equalsIgnoreCase(value)){
        return false;
    }
    return true;
}
}

像这样将项目添加到您的 jComboBox：

JComboBox<String> jComboBox = new JComboBox<>();
jComboBox.addItem("Please select a scurity question");
jComboBox.addItem("Question 1");
jComboBox.addItem("Question 2");

当您执行验证操作时，您需要添加以下几行：

ValidatorFactory validatorFactory = Validation.buildDefaultValidatorFactory();
Validator validator = validatorFactory.getValidator();

String question = jComboBox.getSelectedItem().toString();
MyModel model = new MyModel();
model.setQuestion(model);

Set<ConstraintViolation<MyModel>> constraintViolations = validator.validate(model);

if (!constraintViolations.isEmpty()) {
        String error = "";
        for (ConstraintViolation<MyModel> constraintViolation : constraintViolations) {
                error += constraintViolation.getMessage();
                JOptionPane.showMessageDialog(null, error);
        }
}

如果您尝试在不选择问题的情况下发送请求，它将显示请选择安全问题消息。

【讨论】：