數(shù)據(jù)分頁(yè)，在開(kāi)發(fā)中必不可少，由于數(shù)據(jù)量太大，不得不進(jìn)行處理。但是對(duì)于分頁(yè)，又有很多種方式，比如使用sql語(yǔ)句的limit，或者使用jquery的插件。但是底層的邏輯，都是需要的。
在這里貼出bean對(duì)象的代碼，以及一個(gè)輔助類。我做的這個(gè)項(xiàng)目是一個(gè)個(gè)人博客，算是個(gè)人網(wǎng)站吧。
(只貼部分底層邏輯代碼)
Page.java
package cn.edu.ldu.util;
public class Page {
private int everyPage; //每頁(yè)顯示的數(shù)量
private int totalPage; //總頁(yè)數(shù)
private int totalCount; //總數(shù)量
private int currentPage; //當(dāng)前頁(yè)
private int beginIndex; //起始頁(yè)
private boolean hasPrepage; //是否有上一頁(yè)
private boolean hasNextPage; //是否有下一頁(yè)
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 {
//創(chuàng)建分頁(yè)信息對(duì)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);
}
//獲得每頁(yè)顯示記錄數(shù)
public static int getEveryPage(int everyPage) {
return everyPage == 0 ? 10 : everyPage;
}
//獲得當(dāng)前頁(yè)
public static int getCurrentPage(int currentPage) {
return currentPage == 0 ? 10 : currentPage;
}
//獲得總頁(yè)數(shù)
public static int getTotalPage(int everyPage,int totalCount) {
int totalPage=0;
//要判斷每頁(yè)是否滿頁(yè)，否則頁(yè)數(shù)+1
if(totalCount!=0 totalCount%everyPage==0) {
totalPage=totalCount/everyPage;
}
else {
totalPage=totalCount/everyPage+1;
}
return totalPage;
}
//獲得起始位置
public static int getBeginIndex(int everyPage,int currentPage) {
return everyPage*(currentPage-1);
}
//判斷是否有上一頁(yè)
public static boolean getHasPrePage(int currentPage) {
return currentPage== 1 ? false : true;
}
//判斷是否有下一頁(yè)
public static boolean getHasNextPage(int totalPage, int currentPage) {
return (currentPage == totalPage) || (totalPage == 0) ? false : true;
}
}
每次我只需要去調(diào)用即可。
//傳入每頁(yè)顯示的頁(yè)數(shù)，總記錄數(shù)，當(dāng)前頁(yè)
Page page=PageUtil.createPage(5, diaryDao.findAllCount(), currentPage);
以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。
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