bookstore 新手练习使用，也可作为模板，jsp+servet,更好地复习巩固知识-bookstore novice exercise, can also be used as a template, jsp+ servet, better review and consolidate knowledge

说明 这一段在复习数据结构和算法,有一些零星笔记,在Others这个归类下-That review data structures and algorithms in this passage, there are a few scattered notes, in under the classification of Others