判断javabean是否非空，并给前台报出错误信息

迷南。 2022-04-23 06:34 110阅读 0赞

### 1、工具类 ###

package com.duodian.youhui.admin.utils;
    
    import com.duodian.youhui.admin.Exceptions.AppException;
    import com.duodian.youhui.entity.db.taobao.TaobaoWechat;
    
    import java.lang.reflect.Field;
    
    /** * 作者 ：HealerJean * 日期 ：2019/1/24 下午4:30. * 类描述：判断是否为空 或者是null 工具 */
    public class JudgeNullUtils { 
    
        public static boolean isNull(Object object,String ... fieldName){ 
            try { 
                for (int i = 0; i < fieldName.length; i++) { 
                    Field field = null;
    
                        field = object.getClass().getDeclaredField(fieldName[i]);
    
                    field.setAccessible(true);//暴力反射，获取获取数据
                    if(field.get(object)==null){ 
                        //返回flase或者直接抛出异常，根据我们的情况而定
                        throw  new AppException(fieldName[i]+"不能为空");
                    }
                }
                return true ;
            } catch (NoSuchFieldException e) { 
                e.printStackTrace();
            } catch (IllegalAccessException e) { 
                e.printStackTrace();
            }
            return false ;
        }
    
    }

### 2、catch捕获 ###

@ApiOperation(value = "添加淘宝营销总代理",
                notes = "添加淘宝营销总代理",
                consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE,
                produces = MediaType.APPLICATION_JSON_VALUE,
                response = ResponseBean.class
        )
        @ResponseBody
        @GetMapping("addEsWechat")
        public ResponseBean addEsWechat(TaobaoEsWechat taobaoWechat ){ 
            try { 
                JudgeNullUtils.isNull(taobaoWechat,"code","status");
                return ResponseBean.buildSuccess(taobaoEsWechatService.addTaobaoEsWechat(taobaoWechat));
            } catch (AppException e) { 
                ExceptionLogUtils.log(e, this.getClass());
                return ResponseBean.buildFailure(e.getCode(),e.getMessage());
            } catch (Exception e) { 
                ExceptionLogUtils.log(e, this.getClass());
                return ResponseBean.buildFailure(e.getMessage());
            }
        }

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