JavaBean字段如何防止非空赋值

 if(string!=null){
    date.setBigValue(new BigDecimal(string));
  }

public class User {
 
//  private int age;
    private Integer age;
    private String name;
    private String gender;
    private BigDecimal bigDecimal;
    private Date date ;
    private Long longvalue;    
    private String dateStr ; //注意这里是String类型的日期 例如 2018-12-09 00:00:00
    get set……

public class UserNow {
    private String nameNow;
    private String genderNow;
    private Integer ageNow;
    private BigDecimal bigDecimalNow ;
    private Date dateNow ;
    private Long longvalueNow;
    private Date dateStrNow ; //注意这里是Date类型
get set……

package com.hlj.IgnoreNullBean;
import org.junit.platfORM.commons.util.StringUtils;
import java.lang.reflect.Field;
import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

public class JavaBeanUtil {
    
    public static  void setFieldValue(Object object,String originFieldName,Object newObject,String newFilldName,String ...dateFormat) {
        try {
            Field field = object.getClass().getDeclaredField(originFieldName);
            field.setAccessible(true);
            Field newfield = newObject.getClass().getDeclaredField(newFilldName);
            newfield.setAccessible(true);
            String newfieldType=newfield.getGenericType().toString();
            if (field.get(object) != null && StringUtils.isNotBlank(field.get(object).toString())) {
                String value = field.get(object).toString();
                System.out.println(value);
                switch (newfieldType){
                    case "class java.lang.Integer":
                        newfield.set(newObject, Integer.valueOf(value));
                        break;
                    case "class java.lang.Long":
                        newfield.set(newObject, Long.valueOf(value));
                        break;
                    case "class java.math.BigDecimal":
                        newfield.set(newObject, new BigDecimal(Double.valueOf(value)) );
                        break;
                    case "class java.util.Date":
                        Date  date = null;
                        if(dateFormat!=null&&dateFormat.length>0){
                            date = new SimpleDateFormat(dateFormat[0]).parse(value);
                            newfield.set(newObject, date);
                        }else {
                              date=new SimpleDateFormat("EEE MMM dd HH:mm:ss Z yyyy", Locale.UK).parse(value);
                        }
                        newfield.set(newObject, date);
                        break;
                    default:
                        break;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

package com.hlj.IgnoreNullBean;
import com.hlj.IgnoreNullBean.data.User;
import com.hlj.IgnoreNullBean.data.UserNow;
import java.math.BigDecimal;
import java.util.Date;

public class TestMain {
    public static void main(String[] args) {
        User user = new User();
        user.setAge(25);
        user.setBigDecimal(new BigDecimal(10.21));
        user.setDate(new Date());
        user.setLongvalue(100L);
        user.setDateStr("2018-12-09 00:00:00");
        UserNow userNow = new UserNow() ;
        JavaBeanUtil.setFieldValue(user,"age",userNow,"ageNow");
        System.out.println("ageNow:"+userNow.getAgeNow());
        JavaBeanUtil.setFieldValue(user,"bigDecimal",userNow,"bigDecimalNow");
        System.out.println("bigDecimalNow:"+userNow.getBigDecimalNow());
        JavaBeanUtil.setFieldValue(user,"date",userNow,"dateNow");
        System.out.println("dateNow:"+ userNow.getDateNow());
        JavaBeanUtil.setFieldValue(user,"longvalue",userNow,"longvalueNow");
        System.out.println("longvalueNow:"+userNow.getLongvalueNow());
        JavaBeanUtil.setFieldValue(user,"dateStr",userNow,"dateStrNow","yyyy-MM-dd HH:mm:ss");
        System.out.println("dateStrNow:"+userNow.getDateStrNow());
    }
ageNow:25
bigDecimalNow:10.21000000000000085265128291212022304534912109375
dateNow:Fri Dec 14 19:27:07 CST 2018
longvalueNow:100
dateStrNow:Sun Dec 09 00:00:00 CST 2018

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;

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 ;
    }
}

    @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());
        }
    }