开发自定义注解实现——如果传参里面包含有 “猪头” 就跳出！

一、实体类——TbUserDO

package com.example.test05.demo.model;

import cn.afterturn.easypoi.excel.annotation.Excel;
import com.baomidou.mybatisplus.annotation.TableName;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import java.io.Serializable;
import java.util.Date;

import com.example.test05.demo.config.DbcConstraint;
import com.fasterxml.jackson.annotation.JsonFormat;
import lombok.Data;
import lombok.EqualsAndHashCode;
import org.springframework.format.annotation.DateTimeFormat;

import javax.validation.Valid;
import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotBlank;


/**
 * <p>
 * 
 * </p>
 *
 * @author DBC
 * @since 2021-11-05
 */
@Data
@EqualsAndHashCode(callSuper = false)
@TableName("tb_user")
public class TbUserDO implements Serializable {

    private static final long serialVersionUID = 1L;

    @TableId(value = "id", type = IdType.AUTO)
    private Integer id;

    @NotBlank(message = "姓名不能为空！")
    @Excel(name = "姓名")
    @DbcConstraint(message = "名字里面不能有猪头！")
    private String name;


    @Min(value = 1, message = "年龄不能小于1！")
    @Max(value = 120, message = "年龄不能大于120！")
    @Excel(name = "年龄")
    private String age;

    @JsonFormat(timezone = "GMT+8",pattern = "yyyy-MM-dd")
    @DateTimeFormat(pattern = "yyyy-MM-dd")
    @Excel(name = "时间")
    private Date time;

}

二、配置自定义注解

package com.example.test05.demo.config;

import javax.validation.Constraint;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import javax.validation.Payload;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * @author DBC
 * @date 2022/7/11 16:35
 * @network dbc655.top
 */
@Target({ElementType.METHOD, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = DbcConstraint.DbcConstraintValidator.class)
public @interface DbcConstraint {
    String message() default "参数错误";

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

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

    class DbcConstraintValidator implements ConstraintValidator<DbcConstraint, Object> {
        @Override
        public void initialize(DbcConstraint myConstraint) {
            //初始化的时候
            System.out.println("正在初始化");
        }

        @Override
        public boolean isValid(Object o, ConstraintValidatorContext constraintValidatorContext) {
            //这里写判断逻辑
            String name = (String) o;

            return !name.contains("猪头");
        }
    }
}

三、直接调用即可

    @PostMapping("xinzeng")
    public JsonData xinzeng(@RequestBody @Validated TbUserDO userDO) {
        
        JsonData jsonData = tbUserService.xinzeng(userDO);
        return jsonData;
    }

四、结果返回

{
    "code": -1,
    "data": "2022-07-11 17:03:19",
    "msg": "名字里面不能有猪头！"
}