1、自定义假分页-工具类

  1. @Slf4j
  2. public class PageInfoUtil<T> {
  3.     /** 总记录数 */
  4.     private Long total = 0L;
  5.     /** 结果集 */
  6.     private List<T> list;
  7.     /** 当前页的页码 */
  8.     private int pageNum;
  9.     /** 每页的数量 */
  10.     private int pageSize;
  11.     /** 当前页面第一个元素在数据库中的行号 */
  12.     private int startRow;
  13.     /** 当前页面最后一个元素在数据库中的行号 */
  14.     private int endRow;
  15.     /** 当前页的数量 */
  16.     private int size;
  17.     /** 总页数 */
  18.     private int pages;
  19.     /** 是否为第一页 */
  20.     private boolean isFirstPage;
  21.     /** 是否为最后一页 */
  22.     private boolean isLastPage;
  23.     /** 是否有前一页 */
  24.     private boolean hasPreviousPage;
  25.     /** 是否有后一页 */
  26.     private boolean hasNextPage;
  28.     public PageInfoUtil() {
  29.         this.isFirstPage = false;
  30.         this.isLastPage = false;
  31.         this.hasPreviousPage = false;
  32.         this.hasNextPage = false;
  33.     }
  35.     public PageInfoUtil(List<T> list) {
  36.         if (list instanceof Page) {
  37.             Page<T> page = (Page<T>)list;
  38.             this.pageNum = page.getPageNum();
  39.             this.pageSize = page.getPageSize();
  40.             this.pages = page.getPages();
  41.             this.list = page;
  42.             this.size = page.size();
  43.             this.total = page.getTotal();
  44.             if (this.size == 0) {
  45.                 this.startRow = 0;
  46.                 this.endRow = 0;
  47.             } else {
  48.                 this.startRow = page.getStartRow() + 1;
  49.                 this.endRow = this.startRow - 1 + this.size;
  50.             }
  51.         }else if (list instanceof Collection) {
  52.             this.pageNum = 1;
  53.             this.pageSize = list.size();
  54.             this.pages = 1;
  55.             this.list = list;
  56.             this.size = list.size();
  57.             this.total = (long)list.size();
  58.             this.startRow = 0;
  59.             this.endRow = list.size() > 0 ? list.size() - 1 : 0;
  60.         }
  61.     }
  63.     public Long getTotal() {
  64.         return total;
  65.     }
  67.     public void setTotal(Long total) {
  68.         this.total = total;
  69.     }
  71.     public List<T> getList() {
  72.         return list;
  73.     }
  75.     public void setList(List<T> list) {
  76.         this.list = list;
  77.     }
  78. }