分页的逻辑以及需要的参数

把分页查询的相关属性存到对象中：

1、属性：
①private List<student> list;//结果及数据类型
    private Integer totalCount;//结果总条数

    private Integer currentPage = 1;//当前页  用户传入
    private Integer pageSize = 5;//每页条数   用户传入

    private Integer beginPage= 1;//首页
    private Integer  prevPage;//上一页
    private Integer  nextPage;//下一页
    private Integer  totalPage;//末页 总页数

    public Page(Integer currentPage, Ingeter pageSize, list<Student> list,Ingeter totalCount){
      this.list = list;
      this.totalCount=totalCount;
      this.currentPage = currentPage;
      this.pageSize = pageSize;
     //计算出个数据
     this.totalPage=totalCount % pageSize==0? totalCount/pageSize: totalCount/pageSize+1
      this.prevPage =totalCount-1>=1? currentPage-1:1;
      this.nextPage = currentPage+1<=totalPage?currentPage+1: totalPage;


}