【项目知识点】数据校验统一异常处理，分组检验

package com.shop.common.exception;


public enum BizCodeEnum {

    UNKNOW_EXCEPTION(10000,"系统未知异常"),
    VALID_EXCEPTION(10001,"参数校验异常");

    private int code;
    private String msg;

    BizCodeEnum(int code,String msg){
        this.code = code;
        this.msg = msg;
    }


    public int getCode() {
        return code;
    }

    public String getMsg() {
        return msg;
    }
}

package com.shop.gulimall.product.exception;

import com.shop.common.exception.BizCodeEnum;
import com.shop.common.utils.R;
import org.springframework.boot.context.properties.bind.BindResult;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

import java.util.HashMap;
import java.util.Map;



 // 集中处理所有异常
@RestControllerAdvice(basePackages = {"com.shop.gulimall.product.controller"})
public class GulimallExceptionControllerAdvice {


    @ExceptionHandler(value = MethodArgumentNotValidException.class)
    public R handleVaildException(MethodArgumentNotValidException e){

        BindingResult bindResult = e.getBindingResult();

        Map errorMap = new HashMap();

        bindResult.getFieldErrors().forEach(fieldError -> {
            errorMap.put(fieldError.getField(),fieldError.getDefaultMessage());
        });

        return R.error(BizCodeEnum.VALID_EXCEPTION.getCode(),BizCodeEnum.VALID_EXCEPTION.getMsg()).put("data",errorMap);
    }


    @ExceptionHandler(value = Throwable.class)
    public R handleException(Throwable throwable){

        return R.error(BizCodeEnum.UNKNOW_EXCEPTION.getCode(),BizCodeEnum.UNKNOW_EXCEPTION.getMsg());

    }
}

package com.shop.gulimall.product.entity;

import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;

import java.io.Serializable;
import java.util.Date;

import com.shop.common.valid.AddGroup;
import com.shop.common.valid.UpdateGroup;
import lombok.Data;
import org.hibernate.validator.constraints.URL;

import javax.validation.constraints.*;


@Data
@TableName("pms_brand")
public class BrandEntity implements Serializable {
	private static final long serialVersionUID = 1L;

	
	
	@NotNull(message = "修改Id不能为空")
	@TableId
	private Long brandId;
	
	@NotBlank(message = "品牌名不能为空")
	private String name;
	
	@NotEmpty
	@URL(message = "不是合法地址")
	private String logo;
	
	private String descript;
	
	private Integer showStatus;
	
	@NotEmpty
	@Pattern(regexp = "/^[a-zA-Z]$/",message = "检索必须是一个字母")
	private String firstLetter;
	
	@NotNull
	@Min(value = 0,message = "排序最小为0")
	private Integer sort;

}

在需要检验的参数前加上@Valid，如下：

   @RequestMapping("/save")

    public R save(@Valid  @RequestBody BrandEntity brand){

		brandService.save(brand);

        return R.ok();
    }

先定义两个空接口：

public interface UpdateGroup {
}

public interface AddGroup {
}

实体类字段加上注解，如果没有标注分组，则不生效：

@Data
@TableName("pms_brand")
public class BrandEntity implements Serializable {
	private static final long serialVersionUID = 1L;

	
	@Null(message = "新增不能指定Id",groups = {AddGroup.class})
	@NotNull(message = "修改Id不能为空",groups = {UpdateGroup.class})
	@TableId
	private Long brandId;
	
	@NotBlank(message = "品牌名不能为空",groups = {AddGroup.class,UpdateGroup.class})
	private String name;
	
	@NotEmpty
	@URL(message = "不是合法地址")
	private String logo;
	
	private String descript;
	
	private Integer showStatus;
	
	@NotEmpty
	@Pattern(regexp = "/^[a-zA-Z]$/",message = "检索必须是一个字母")
	private String firstLetter;
	
	@NotNull
	@Min(value = 0,message = "排序最小为0")
	private Integer sort;

}

controller加上注解@Validated ，如下：

 
    @RequestMapping("/save")

    public R save(@Validated({AddGroup.class}) @RequestBody BrandEntity brand){

		brandService.save(brand);

        return R.ok();
    }