自定义异常处理

public enum BizCodeEnume {
    UNKNOW_EXCEPTION(10000,"系统未知异常"),
    VALID_EXCEPTION(10001,"参数格式校验失败");

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

    public int getCode(){
        return code;
    }

    public String getMsg() {
        return msg;
    }
}

package com.atguigu.gulimall.product.exception;

import com.atguigu.common.exception.BizCodeEnume;
import com.atguigu.common.utils.R;
import lombok.extern.slf4j.Slf4j;
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;

//@ControllerAdvice统一集中异常处理
@Slf4j
/*@ControllerAdvice(basePackages = "com.atguigu.gulimall.product.controller")*/
//处理com.atguigu.gulimall.product.controller包下抛出的异常
@RestControllerAdvice(basePackages = "com.atguigu.gulimall.product.controller")
public class GulimallExceptionControllerAdvice {

    //使用@ExceptionHandler注解感知controller包抛出的异常
    @ExceptionHandler(value = MethodArgumentNotValidException.class)
    public R handleVaildException( MethodArgumentNotValidException e){
        BindingResult bindingResult = e.getBindingResult();
        Map<String,String> errorMap = new HashMap<>();
　　//将错误信息遍历并且放入map中
        bindingResult.getFieldErrors().forEach((fieldError)->{
            errorMap.put(fieldError.getField(),fieldError.getDefaultMessage());
        });
        return R.error(BizCodeEnume.VALID_EXCEPTION.getCode(),BizCodeEnume.VALID_EXCEPTION.getMsg()).put("data",errorMap);
    }

    @ExceptionHandler(value = Throwable.class)
    public R handleException(){
       return R.error(BizCodeEnume.UNKNOW_EXCEPTION.getCode(),BizCodeEnume.UNKNOW_EXCEPTION.getMsg());
    }
}

package com.atguigu.gulimall.product.controller;

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

//import org.apache.shiro.authz.annotation.RequiresPermissions;
import com.atguigu.common.valid.AddGroup;
import com.atguigu.common.valid.UpadteGroup;
import com.atguigu.common.valid.UpadteStatusGroup;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.validation.BindingResult;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import com.atguigu.gulimall.product.entity.BrandEntity;
import com.atguigu.gulimall.product.service.BrandService;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.R;

import javax.validation.Valid;


/**
 * 品牌
 *
 * @author chenshun
 * @email linchenguang@gmail.com
 * @date 2020-05-19 20:39:16
 */
@RestController
@RequestMapping("product/brand")
public class BrandController {
    @Autowired
    private BrandService brandService;

    /**
     * 列表
     */
    @RequestMapping("/list")
    //@RequiresPermissions("product:brand:list")
    public R list(@RequestParam Map<String, Object> params){
        PageUtils page = brandService.queryPage(params);

        return R.ok().put("page", page);
    }


    /**
     * 信息
     */
    @RequestMapping("/info/{brandId}")
    //@RequiresPermissions("product:brand:info")
    public R info(@PathVariable("brandId") Long brandId){
        BrandEntity brand = brandService.getById(brandId);

        return R.ok().put("brand", brand);
    }

    /**
     * 保存
     */
    @RequestMapping("/save")
    //@RequiresPermissions("product:brand:save")
    public R save(@Validated(AddGroup.class) @RequestBody BrandEntity brand/*, BindingResult result*/){
/*        if (result.hasErrors()) {
            Map<String,String> map = new HashMap<>();
            //获取检验的错误结果
            result.getFieldErrors().forEach((item)->{
                String message = item.getDefaultMessage();
                //获取错误属性
                String field = item.getField();
                map.put(field,message);
            });
            return R.error(400, "提交数据不合法").put("data",map);*/
        brandService.save(brand);

        return R.ok();
    }

    /**
     * 修改
     */
    @RequestMapping("/update")
    //@RequiresPermissions("product:brand:update")
    public R update(@Validated(UpadteGroup.class) @RequestBody BrandEntity brand){
        brandService.updateById(brand);

        return R.ok();
    }
    /**
     * 修改状态
     */
    @RequestMapping("/update/status")
    //@RequiresPermissions("product:brand:update")
    public R updateStatus(@Validated(UpadteStatusGroup.class) @RequestBody BrandEntity brand){
        brandService.updateById(brand);

        return R.ok();
    }

    /**
     * 删除
     */
    @RequestMapping("/delete")
    //@RequiresPermissions("product:brand:delete")
    public R delete(@RequestBody Long[] brandIds){
        brandService.removeByIds(Arrays.asList(brandIds));

        return R.ok();
    }

}

package com.atguigu.gulimall.product.entity;

import com.atguigu.common.valid.AddGroup;
import com.atguigu.common.valid.ListValue;
import com.atguigu.common.valid.UpadteGroup;
import com.atguigu.common.valid.UpadteStatusGroup;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;

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

import lombok.Data;
import org.hibernate.validator.constraints.URL;

import javax.validation.constraints.*;

/**
 * 品牌
 * 
 * @author chenshun
 * @email linchenguang@gmail.com
 * @date 2020-05-19 20:39:16
 */
@Data
@TableName("pms_brand")
public class BrandEntity implements Serializable {
    private static final long serialVersionUID = 1L;

    /**
     * 品牌id
     */
    @NotNull(message = "修改必须指定品牌id",groups = {UpadteGroup.class})
    @Null(message = "新增必须指定品牌id",groups = {AddGroup.class})
    @TableId
    private Long brandId;
    /**
     * 品牌名
     */
    @NotBlank(message = "品牌名必须提交",groups = {AddGroup.class,UpadteGroup.class})
    private String name;
    /**
     * 品牌logo地址,新增时不能为空并且符合URL地址格式，而修改时可以为空但必须符合URL地址
     */
    @NotBlank(groups = {AddGroup.class})
    @URL(message = "必须上传正确图片",groups = {AddGroup.class,UpadteGroup.class})
    private String logo;
    /**
     * 介绍
     */
    private String descript;
    /**
     * 显示状态[0-不显示；1-显示]
     */
    @NotNull(groups = {AddGroup.class, UpadteStatusGroup.class})
    @ListValue(vals = {0,1},groups = {AddGroup.class, UpadteStatusGroup.class})
    private Integer showStatus;
    /**
     * 检索首字母
     */
    @NotEmpty(groups = {AddGroup.class})
    @Pattern(regexp = "^[a-zA-Z]$",message = "范围必须在a-z或A-Z之间",groups = {AddGroup.class,UpadteGroup.class})
    private String firstLetter;
    /**
     * 排序
     */
    @NotNull(groups = {AddGroup.class})
    @Min(value = 0,message = "排序必须大于等于0",groups = {AddGroup.class,UpadteGroup.class})
    private Integer sort;

}

//1、
public interface UpadteGroup {
}
//2、
public interface UpadteStatusGroup {
}
//3、
public interface AddGroup {
}