action service dao大家怎么理解
今天看见一段代码：
service层几乎跟dao一样的方法，为什么非要套一层，为了分层而分层？

@Service("articleService")public class ArticleService {@Autowiredprivate ArticleDao articleDao;public Article findByid(String id) {return (Article) articleDao.findById(id);}public Article findOne(Map<String, String> params) {return this.articleDao.findOne(params);}public Article save(Article bean) {return (Article) articleDao.save(bean);}public Pagination<Article> getPageArticle(int pageNo, int pageSize) {return articleDao.getPageArticle(pageNo, pageSize);}/** * 暂时只是固定去修改,会有下一篇博客,写高级修改... */public void update(String id, Map<String, String> params) {this.articleDao.updateEntity(id, params);}}