/**
	 * 按照页码取值(从current_page页开始，每页page_size条)
	 * @param key
	 * @param params
	 * @param current_page
	 * @param page_size
	 * @return
	 */
	public <T> Pagination getPaginationByPage(String key, Object params,int current_page,int page_size) {
		int count             =  (Integer) getSqlSession().selectOne(key+"_count", params);
		List<Object> list     =  getSqlSession().selectList(key, params,new RowBounds((current_page - 1) * page_size, page_size));
		Pagination pagination =  new Pagination();
		pagination.paging(current_page, page_size, count);
		pagination.setList(list);
		return pagination;  
	}