hibernate_validator_10

约束条件组合--把多个约束组合成一个约束

上一节中我们自定义的@CheckCase是用来检查是否String为大写的注释,默认情况下当我们的String为null的时候也被认为正确的

CaseMode枚举

package test02;

public enum CaseMode {
    UPPER,
    LOWER;
}

User类

package test02;

public class User {
    @CheckCase(value=CaseMode.UPPER)
    private String name;
    
//    @CheckCase(CaseMode.UPPER)
//    private String email="email";
}

@CheckCase

package test02;

import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.*;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import javax.validation.Constraint;
import javax.validation.Payload;
@Target({METHOD, FIELD, ANNOTATION_TYPE })
@Retention(RUNTIME)
@Constraint(validatedBy = CheckCaseValidator.class)
@Documented
public @interface CheckCase {
    String message() default "{test02.CheckCase.message}";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};
    CaseMode value();

}

验证器

package test02;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

public class CheckCaseValidator implements ConstraintValidator<CheckCase, String> {
    private CaseMode caseMode;

    public void initialize(CheckCase constraintAnnotation) {
        this.caseMode = constraintAnnotation.value();
    }

    public boolean isValid(String object, ConstraintValidatorContext constraintContext) {
        if (object == null)
            return true;
        boolean isValid;
        if (caseMode == CaseMode.UPPER) {
            isValid = object.equals(object.toUpperCase());
        } else {
            isValid = object.equals(object.toLowerCase());
        }
//        if(!isValid) {
//            constraintContext.disableDefaultConstraintViolation();
//            constraintContext.buildConstraintViolationWithTemplate( "{com.mycompany.constraints.CheckCase.message}" ).addConstraintViolation();
//            }
        return isValid;
    }
}

运行结果:

@Test
    public void test01(){
        User u=new User();
        Set<ConstraintViolation<User>> validate = validator.validate(u);
        System.out.println(validate.size());
        //0
        System.out.println(validate);
        //[]
    }

所以这一节我们将该注释和@notNull的注释组合起来

一,创建一个约束条件组合 @UpperNotNull

package test03;
import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.*;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import javax.validation.Constraint;
import javax.validation.Payload;
import javax.validation.constraints.NotNull;

import test02.CheckCase;
import test02.CaseMode;

@NotNull
@CheckCase(CaseMode.UPPER)
@Target( { METHOD, FIELD, ANNOTATION_TYPE })
@Retention(RUNTIME)
@Constraint(validatedBy = {})
@Documented
public @interface UpperNotNull {
    String message() default "{com.mycompany.constraints.validlicenseplate}";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};

}

package test02;

import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.*;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import javax.validation.Constraint;
import javax.validation.Payload;
@Target({METHOD, FIELD, ANNOTATION_TYPE })
@Retention(RUNTIME)
@Constraint(validatedBy = CheckCaseValidator.class)
@Documented
public @interface CheckCase {
    String message() default "{test02.CheckCase.message}";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};
    CaseMode value();

}

属性文件中的内容

test02.CheckCase.message = must be false {value}
com.mycompany.constraints.validlicenseplate=must not be null and must be Upper writen 

二,创建Po测试类

package test03;

public class User {
    @UpperNotNull
    private String name;
    
//    @CheckCase(CaseMode.UPPER)
//    private String email="email";
}

 三,测试

package test03;

import java.util.Set;

import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
import org.junit.BeforeClass;
import org.junit.Test;
public class MyTest {

    private static Validator validator;

    /**
     * 获取一个验证器
     */
    @BeforeClass
    public static void setUp() {
        ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
        validator = factory.getValidator();
    }
    @Test
    public void test01(){
        User u=new User();
        Set<ConstraintViolation<User>> validate = validator.validate(u);
        System.out.println(validate.size());
        //1
        System.out.println(validate);
        //[ConstraintViolationImpl{interpolatedMessage='不能为null', propertyPath=name, rootBeanClass=class test03.User, messageTemplate='{javax.validation.constraints.NotNull.message}'}]
    }

}

当我们把Po类中的name改成:

package test03;

public class User {
    @UpperNotNull
    private String name="wangyang";
    
//    @CheckCase(CaseMode.UPPER)
//    private String email="email";
}

再测试:

@Test
    public void test01(){
        User u=new User();
        Set<ConstraintViolation<User>> validate = validator.validate(u);
        System.out.println(validate.size());
        //1
        System.out.println(validate);
        //[ConstraintViolationImpl{interpolatedMessage='must be false UPPER', propertyPath=name, rootBeanClass=class test03.User, messageTemplate='{test02.CheckCase.message}'}]
    }