复制类 BeanUtils.copyProperties 选择性赋值字段

废话不多说上代码…

List<TransFlow> oldList = Lists.newArrayList(); 
Trans trans = new  Trans();
Trans oldTrans = oldList.get(0);
BeanUtils.copyProperties(oldTrans ,trans , KeyConstants.STATE,KeyConstants.BATCH_NO,KeyConstants.DR_CR_FLAG);

将oldTrans 值复制到 trans 其中KeyConstants.STATE,KeyConstants.BATCH_NO,KeyConstants.DR_CR_FLAG属性值除外

除去非空字段方法

    public static String[] getNullPropertyNames (Object source) {
        final BeanWrapper src = new BeanWrapperImpl(source);
        PropertyDescriptor[] pds = src.getPropertyDescriptors();
        Set<String> emptyNames = new HashSet<String>();
        for(PropertyDescriptor pd : pds) {
            Object srcValue = src.getPropertyValue(pd.getName());
            if (srcValue == null) {
                emptyNames.add(pd.getName());
            }
        }

        String[] result = new String[emptyNames.size()];
        return emptyNames.toArray(result);
    }

调用

    BeanUtils.copyProperties(oldTrans ,trans,getNullPropertyNames(oldTrans ));

参考链接
https://www.jianshu.com/p/17c4fcf59418