JsonConfig cfg = new JsonConfig();
cfg.setPropertySetStrategy(new PropertySetStrategy() {
    @Override
    public void setProperty(Object bean,String key,Object value)
            throws JSONException {
        try {
            PropertyUtils.setNestedProperty(bean,key,value);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
});
cfg.setRootClass(TweetView.class);
TweetView tv = (TweetView) JSONObject.toBean(jo,cfg);

json转换成对像过滤掉无用的属性