pager.java

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package com.zjxy.hibernate.pagerHelp;

public class Pager {
  private int totalRows; //总行数
  private int pageSize = 5; //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

  public Pager() {
  }

  public Pager(int _totalRows) {
    totalRows = _totalRows;
    totalPages=totalRows/pageSize;
    int mod=totalRows%pageSize;
    if(mod>0){
      totalPages++;
    }
    currentPage = 1;
    startRow = 0;
  }

  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;
  }

  public void first() {
    currentPage = 1;
    startRow = 0;
  }

  public void previous() {
    if (currentPage == 1) {
      return;
    }
    currentPage--;
    startRow = (currentPage - 1) * pageSize;
  }

  public void next() {
    if (currentPage < totalPages) {
      currentPage++;
    }
    startRow = (currentPage - 1) * pageSize;
  }

  public void last() {
    currentPage = totalPages;
    startRow = (currentPage - 1) * pageSize;
  }

  public void refresh(int _currentPage) {
    currentPage = _currentPage;
    if (currentPage > totalPages) {
      last();
    }
  }

}