自定义Hibernate Validator约束

定义注解

实现一个只能输入指定状态的约束条件

import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.ANNOTATION_TYPE;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

@Target( { METHOD, FIELD, ANNOTATION_TYPE })
@Retention(RUNTIME)
@Constraint(validatedBy = StatusValidator.class)
@Documented
public @interface ValidStatus {
    String message() default "状态错误 ";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};
    /**
     * 有效的状态值集合，默认{1,2}
     */
    int[] value() default {1,2};
}

定义校验类

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import java.util.Arrays;
import java.util.List;

/**
 * 校验状态是否属于指定状态集
 (ConstraintValidator后指定的泛型对象类型为
 注解类和注解注释的字段类型<ValidStatus, Integer>)
 */
public class StatusValidator implements ConstraintValidator<ValidStatus, Integer> {
    private Integer[] validStatus;

    @Override
    public void initialize(ValidStatus validStatus) {
        int[] ints = validStatus.value();
        int n = ints.length;
        Integer[] integers = new Integer[n];
        for (int i = 0; i < n; i++) {
            integers[i] = ints[i];
        }
        this.validStatus = integers;
    }

    @Override
    public boolean isValid(Integer n, ConstraintValidatorContext constraintValidatorContext) {
        List<Integer> status = Arrays.asList(validStatus);
        if (status.contains(n)) {
            return true;
        }
        return false;
    }
}

程序中使用

public class QueryDTO {
@ValidStatus
@NotNull
private Integer type;
//...省略n行代码
}
@RestController
@RequestMapping(value = "xxx")
public class DemoController {
//...省略n行代码
@PostMapping(value = "/testUrl")
    public Response<ResultVO> getXXXList(@RequestBody @Valid QueryDTO dto){
    //...省略n行代码
    }

}

也可以这样用：

ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
        validator = factory.getValidator();
        Set<ConstraintViolation<QueryDTO>> constraintViolations =
            validator.validate(queryDTO);