简单实现jsp分页

Shun

数据分页，在开发中必不可少，由于数据量太大，不得不进行处理。但是对于分页，又有很多种方式，比如使用sql语句的limit，或者使用jquery的插件。但是底层的逻辑，都是需要的。
在这里贴出bean对象的代码，以及一个辅助类。我做的这个项目是一个个人博客，算是个人网站吧。
(只贴部分底层逻辑代码)
Page.java

package cn.edu.ldu.util;
public class Page {
  private int everyPage;   //每页显示的数量
  private int totalPage;   //总页数
  private int totalCount;   //总数量
  private int currentPage;  //当前页
  private int beginIndex;   //起始页
  private boolean hasPrepage;   //是否有上一页
  private boolean hasNextPage;  //是否有下一页
  public Page() {
  }
  public Page(int everyPage, int totalPage, int totalCount, int currentPage,int beginIndex, boolean hasPrepage, boolean hasNextPage)
  {
  this.everyPage = everyPage;
  this.totalPage = totalPage;
  this.totalCount = totalCount;
  this.currentPage = currentPage;
  this.beginIndex = beginIndex;
  this.hasPrepage = hasPrepage;
  this.hasNextPage = hasNextPage;
  }
  public int getEveryPage() {
  return everyPage;
  }
  public void setEveryPage(int everyPage) {
  this.everyPage = everyPage;
  }
  public int getTotalPage() {
  return totalPage;
  }
  public void setTotalPage(int totalPage) {
  this.totalPage = totalPage;
  }
  public int getTotalCount() {
  return totalCount;
  }
  public void setTotalCount(int totalCount) {
  this.totalCount = totalCount;
  }
  public int getCurrentPage() {
  return currentPage;
  }
  public void setCurrentPage(int currentPage) {
  this.currentPage = currentPage;
  }
  public int getBeginIndex() {
  return beginIndex;
  }
  public void setBeginIndex(int beginIndex) {
  this.beginIndex = beginIndex;
  }
  public boolean isHasPrepage() {
  return hasPrepage;
  }
  public void setHasPrepage(boolean hasPrepage) {
  this.hasPrepage = hasPrepage;
  }
  public boolean isHasNextPage() {
  return hasNextPage;
  }
  public void setHasNextPage(boolean hasNextPage) {
  this.hasNextPage = hasNextPage;
  }
}

PageUtil.java

package cn.edu.ldu.util;
public class PageUtil {
  //创建分页信息对象
  public static Page createPage(int everyPage,int totalCount,int currentPage) {
  everyPage = getEveryPage(everyPage);
  currentPage = getCurrentPage(currentPage);
  int totalPage = getTotalPage(everyPage, totalCount);
  int beginIndex = getBeginIndex(everyPage, currentPage);
  boolean hasPrePage = getHasPrePage(currentPage);
  boolean hasNextPage = getHasNextPage(totalPage, currentPage);
  return new Page(everyPage, totalPage,totalCount, currentPage,
    beginIndex, hasPrePage, hasNextPage);
  }
  //获得每页显示记录数
  public static int getEveryPage(int everyPage) {
  return everyPage == 0 ? 10 : everyPage;
  }
  //获得当前页
  public static int getCurrentPage(int currentPage) {
  return currentPage == 0 ? 10 : currentPage;
  }
  //获得总页数
  public static int getTotalPage(int everyPage,int totalCount) {
  int totalPage=0;
  //要判断每页是否满页，否则页数+1
  if(totalCount!=0 && totalCount%everyPage==0) {
    totalPage=totalCount/everyPage;
  }
  else {
    totalPage=totalCount/everyPage+1;
  }
  return totalPage;
  }
  //获得起始位置
  public static int getBeginIndex(int everyPage,int currentPage) {
  return everyPage*(currentPage-1);
  }
  //判断是否有上一页
  public static boolean getHasPrePage(int currentPage) {
  return currentPage== 1 ? false : true;
  }
  //判断是否有下一页
  public static boolean getHasNextPage(int totalPage, int currentPage) {
  return (currentPage == totalPage) || (totalPage == 0) ? false : true;
  }
}

每次我只需要去调用即可。

//传入每页显示的页数，总记录数，当前页
Page page=PageUtil.createPage(5, diaryDao.findAllCount(), currentPage);

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持CodeAE代码之家。