Java常用工具类集合（四）

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分页工具类 SharePager.java
[java] view plain copypackage com.util;      /**  * 分页工具类  *  */  public class SharePager {      private int totalRows; //总行数      private int pageSize = 20; //每页显示的行数        private int currentPage; //当前页号      private int totalPages; //总页数       private int startRow; //当前页在数据库中的起始行               /**      * 默认构造函数      */      public SharePager()       {                  }                /**默认每页10行      * @param totalRows       */        public SharePager(int totalRows)       {            this.totalRows = totalRows;              totalPages =(int) Math.ceil((double)totalRows / (double)pageSize);            startRow = 0;        }                        /**可自定义每页显示多少页      * @param totalRows       * @param pageSize       */        public SharePager(int totalRows, int pageSize)       {            this.totalRows = totalRows;            this.pageSize = pageSize;           if(this.pageSize<1)                             this.pageSize=1;          else if(pageSize>20)              this.pageSize=20;    //        if(this.pageSize>totalRows){  //          this.pageSize=(int)totalRows;  //        }                            totalPages =(int) Math.ceil((double)totalRows / (double)this.pageSize);             currentPage = 1;            startRow = 0;        }                /**      * 跳转到首页      */      public void first()       {            this.currentPage = 1;            this.startRow = 0;       }              /**      * 跳转到上一页      */      public void previous()       {            if (currentPage == 1)           {                return;            }            currentPage--;            startRow = (currentPage-1) * pageSize;       }              /**      * 跳转到下一页      */      public void next()       {            if (currentPage < totalPages)          {                currentPage++;            }            startRow = (currentPage-1) * pageSize;        }              /**      *  跳转到尾页      */      public void last()       {            this.currentPage = totalPages;            if(currentPage<1){              currentPage = 1;          }          this.startRow = (currentPage-1) * this.pageSize;          totalPages =(int) Math.ceil((double)totalRows / (double)this.pageSize);                   }              /**      * 跳转到指定页      * @param currentPage   指定的页      */      public void refresh(int currentPage)       {                      if(currentPage < 0)          {              first();          }          if (currentPage > totalPages)           {                last();            }else{              this.currentPage = currentPage;              this.startRow = (currentPage-1) * this.pageSize;            }         }                       public int getStartRow()      {            return startRow;        }              public int getTotalPages()      {            return totalPages;        }              public int getCurrentPage()      {            return currentPage;        }              public int getPageSize()       {            return pageSize;        }              public void setTotalRows(int totalRows)       {            this.totalRows = totalRows;        }              public void setStartRow(int startRow)      {            this.startRow = startRow;        }              public void setTotalPages(int totalPages)       {            this.totalPages = totalPages;        }              public void setCurrentPage(int currentPage)       {            this.currentPage = currentPage;        }             public void setPageSize(int pageSize)       {            this.pageSize = pageSize;        }              public int getTotalRows()       {            return totalRows;        }    }
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