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;
 }

}

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;
 }

}

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