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);
