没有对比，就没有伤害。论对比性比较的必要性。
场景：当新增一个对象时，但是某些值是必输项，这时需要验证参数不能为空，否则保存不成功
案例：
1.验证WithdrawalIouManagementFee的calcType，borrowMainTakeCharge，guaranteeMainTakeCharge为必输项
public void checkIouManagementFeeField(WithdrawalIouManagementFee managementFees) throws LambdaServiceException {
String[][] sourceArr = {{"calcType","管理费计算方式编码"},{"borrowMainTakeCharge","管理费借款主体承担"},{"guaranteeMainTakeCharge","管理费担保主体承担"}};
checkFeild(managementFees,sourceArr,WithdrawalIouManagementFee.class);
}2. 利用java反射，得到getter()方法，取得对应的值，再判断是否null，并返回对应的提示
private void checkFeild(Object obj,String [][] sourceArr,Class cls) throws LambdaServiceException{
String desc = null;
try{
for (int i = 0; i < sourceArr.length; i++) {
String fields[] = sourceArr[i];
String key = fields[0];
//key --> getKey
if(key!=null && key.length()>0){
String getter = "get" + key.substring(0,1).toUpperCase() + key.substring(1,key.length());
Method method = cls.getMethod(getter, null);
Object value = method.invoke(obj, null);
if(value == null || value.toString().trim().equals("")){ //value is null , throw
desc = fields[1];//备注
throw new LambdaServiceException();
}
}
}
}catch (LambdaServiceException e){
throw new LambdaServiceException(desc + "不能为空！");
}catch (Exception e){
log.debug("信息校验异常>>>>>>>>>>>>",e);
}
}
