SpringBoot 使用自定义注解和枚举类对接口入参校验

1. jar包导入

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>

2. 自定义注解

package com.example.server.annotation;

import com.example.server.valid.EnumValidator;
import jakarta.validation.Constraint;
import jakarta.validation.Payload;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Constraint(validatedBy = EnumValidator.class)
@Target({ElementType.FIELD, ElementType.PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
public @interface RegexValidation {

    Class<? extends Enum<?>> value();

    String message() default "Invalid input format";

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

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

}

3. 校验类

package com.example.server.valid;

import com.example.server.annotation.RegexValidation;
import jakarta.validation.ConstraintValidator;
import jakarta.validation.ConstraintValidatorContext;


public class EnumValidator implements ConstraintValidator<RegexValidation, String> {

    private Class<? extends Enum<?>> enumClass;

    @Override
    public void initialize(RegexValidation constraintAnnotation) {
        this.enumClass = constraintAnnotation.value();
    }

    @Override
    public boolean isValid(String value, ConstraintValidatorContext constraintValidatorContext) {
        if (value == null) {
            return true;
        }
        for (Enum<?> e : enumClass.getEnumConstants()) {
            if (e.name().equals(value)) {
                return true;
            }
        }
        return false;
    }

}

4. 定义枚举类

package com.example.server.enums;

public enum GenderRegex {

    MALE, FEMALE, OTHER;

}

5. 被校验的实体类

package com.example.server.entity;

import com.example.server.annotation.RegexValidation;
import com.example.server.enums.GenderRegex;
import lombok.Data;

@Data
public class User {

    private String name;

    private Integer age;

    @RegexValidation(value = GenderRegex.class, message = "输入的性别不符合要求，请重新输入")
    private String gender;

}

6. 全局异常拦截

package com.example.server.advice;

import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

@RestControllerAdvice
public class ControllerExceptionAdvice {
    /**
     * 参数错误异常
     */
    @ExceptionHandler(MethodArgumentNotValidException.class)
    public String methodArgumentNotValidExceptionHandler(MethodArgumentNotValidException e) {
        return e.getBindingResult().getAllErrors().get(0).getDefaultMessage();
    }

    @ExceptionHandler(Exception.class)
    public String exceptionHandler(Exception e) {
        return e.getMessage();
    }

}

7. controller

package com.example.server.controller;

import com.example.server.entity.User;
import jakarta.validation.Valid;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class ServerController {

    @PostMapping("/hello")
    public User hello(@RequestBody @Valid User user) {
        return user;
    }

}