自定义注解校验参数

一、导包

     <dependency>
         <groupId>org.hibernate.validatorgroupId>
         <artifactId>hibernate-validatorartifactId>
     dependency>

二、自定义验证注解

package com.zhk.study.validation;

import org.springframework.messaging.handler.annotation.Payload;

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

import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

@Documented
@Retention(RUNTIME)
@Target({FIELD, METHOD, PARAMETER, TYPE})
@Constraint(validatedBy = UserValidation.NotConflictUserValidator.class)
public @interface NotConflictUser {
    String message() default "用户名称、邮箱、手机号码与现存用户产生重复";

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

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

package com.zhk.study.validation;

import org.springframework.messaging.handler.annotation.Payload;

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

import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

@Documented
@Retention(RUNTIME)
@Target({FIELD, METHOD, PARAMETER, TYPE})
@Constraint(validatedBy = UserValidation.UniqueUserValidator.class)
public @interface UniqueUser {

    String message() default "用户名、手机号码、邮箱不允许与现存用户重复";

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

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

三、自定义验证

package com.zhk.study.validation;

import com.zhk.study.excel.entity.User;
import com.zhk.study.merge.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import java.lang.annotation.Annotation;
import java.util.function.Predicate;

@Slf4j
@Component
public class UserValidation<T extends Annotation> implements ConstraintValidator<T, User> {

    //predicate为true的时候不报错，当false报错
    protected Predicate<User> predicate = c -> true;

    //这个不需要@Component注解加入spring中
    @Autowired
    private UserService userService;

    @Override
    public boolean isValid(User user, ConstraintValidatorContext constraintValidatorContext) {
        return predicate.test(user);
    }

    /**
     * 校验用户是否唯一
     * 即判断数据库是否存在当前新用户的信息，如用户名，手机，邮箱
     */
    public static class UniqueUserValidator extends UserValidation<UniqueUser>{
        @Override
        public void initialize(UniqueUser uniqueUser) {
            predicate = c -> true;
        }
    }

    /**
     * 校验是否与其他用户冲突
     * 将用户名、邮件、电话改成与现有完全不重复的，或者只与自己重复的，就不算冲突
     */
    public static class NotConflictUserValidator extends UserValidation<NotConflictUser>{
        @Override
        public void initialize(NotConflictUser notConflictUser) {
            predicate = c -> {
                return false;
            };
        }
    }

}

三、测试

package com.zhk.study.validation;

import com.zhk.study.excel.entity.User;
import lombok.SneakyThrows;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.validation.Valid;

@RestController
@Validated
public class TestController {



    @RequestMapping("/as")
    public User createUser(@UniqueUser @Valid User user){
        return user;
    }

    @SneakyThrows
    @RequestMapping("/ad")
    public User updateUser(@NotConflictUser @Valid User user){
        return user;
    }
}