java中利用List的subList方法实现对List分页（简单易学）

2024-03-09 21:29:05 398
以下是介绍利用List的subList方法实现对List分页，废话不多说了，直接看代码把
/***//**
*List分页
*实现：利用List的获取子List方法，实现对List的分页
*@author显武
*@date2010-1-816:27:31
*
*/

importjava.util.ArrayList;
importjava.util.List;

publicclassPageModel{
privateintpage=1;//当前页

publicinttotalPages=0;//总页数

privateintpageRecorders;//每页5条数据

privateinttotalRows=0;//总数据数

privateintpageStartRow=0;//每页的起始数

privateintpageEndRow=0;//每页显示数据的终止数

privatebooleanhasNextPage=false;//是否有下一页

privatebooleanhasPreviousPage=false;//是否有前一页

privateListlist;

//privateIteratorit;

publicPageModel(Listlist,intpageRecorders){
init(list,pageRecorders);//通过对象集，记录总数划分
}

/***//**
*初始化list，并告之该list每页的记录数
*@paramlist
*@parampageRecorders
*/
publicvoidinit(Listlist,intpageRecorders){
this.pageRecorders=pageRecorders;
this.list=list;
totalRows=list.size();
//it=list.iterator();
hasPreviousPage=false;
if((totalRows%pageRecorders)==0){
totalPages=totalRows/pageRecorders;
}else{
totalPages=totalRows/pageRecorders+1;
}

if(page>=totalPages){
hasNextPage=false;
}else{
hasNextPage=true;
}

if(totalRows<pageRecorders){
this.pageStartRow=0;
this.pageEndRow=totalRows;
}else{
this.pageStartRow=0;
this.pageEndRow=pageRecorders;
}
}


//判断要不要分页
publicbooleanisNext(){
returnlist.size()>5;
}

publicvoidsetHasPreviousPage(booleanhasPreviousPage){
this.hasPreviousPage=hasPreviousPage;
}

publicStringtoString(inttemp){
Stringstr=Integer.toString(temp);
returnstr;
}

publicvoiddescription(){

Stringdescription="共有数据数:"+this.getTotalRows()+

"共有页数:"+this.getTotalPages()+

"当前页数为:"+this.getPage()+

"是否有前一页:"+this.isHasPreviousPage()+

"是否有下一页:"+this.isHasNextPage()+

"开始行数:"+this.getPageStartRow()+

"终止行数:"+this.getPageEndRow();

System.out.println(description);
}

publicListgetNextPage(){
page=page+1;

disposePage();

System.out.println("用户凋用的是第"+page+"页");
this.description();
returngetObjects(page);
}

/***//**
*处理分页
*/
privatevoiddisposePage(){

if(page==0){
page=1;
}

if((page-1)>0){
hasPreviousPage=true;
}else{
hasPreviousPage=false;
}

if(page>=totalPages){
hasNextPage=false;
}else{
hasNextPage=true;
}
}

publicListgetPreviousPage(){

page=page-1;

if((page-1)>0){
hasPreviousPage=true;
}else{
hasPreviousPage=false;
}
if(page>=totalPages){
hasNextPage=false;
}else{
hasNextPage=true;
}
this.description();
returngetObjects(page);
}

/***//**
*获取第几页的内容
*
*@parampage
*@return
*/
publicListgetObjects(intpage){
if(page==0)
this.setPage(1);
else
this.setPage(page);
this.disposePage();
if(page*pageRecorders<totalRows){//判断是否为最后一页
pageEndRow=page*pageRecorders;
pageStartRow=pageEndRow-pageRecorders;
}else{
pageEndRow=totalRows;
pageStartRow=pageRecorders*(totalPages-1);
}

Listobjects=null;
if(!list.isEmpty()){
objects=list.subList(pageStartRow,pageEndRow);
}
//this.description();
returnobjects;
}

publicListgetFistPage(){
if(this.isNext()){
returnlist.subList(0,pageRecorders);
}else{
returnlist;
}
}

publicbooleanisHasNextPage(){
returnhasNextPage;
}


publicvoidsetHasNextPage(booleanhasNextPage){
this.hasNextPage=hasNextPage;
}


publicListgetList(){
returnlist;
}


publicvoidsetList(Listlist){
this.list=list;
}


publicintgetPage(){
returnpage;
}


publicvoidsetPage(intpage){
this.page=page;
}


publicintgetPageEndRow(){
returnpageEndRow;
}


publicvoidsetPageEndRow(intpageEndRow){
this.pageEndRow=pageEndRow;
}


publicintgetPageRecorders(){
returnpageRecorders;
}


publicvoidsetPageRecorders(intpageRecorders){
this.pageRecorders=pageRecorders;
}


publicintgetPageStartRow(){
returnpageStartRow;
}


publicvoidsetPageStartRow(intpageStartRow){
this.pageStartRow=pageStartRow;
}


publicintgetTotalPages(){
returntotalPages;
}


publicvoidsetTotalPages(inttotalPages){
this.totalPages=totalPages;
}


publicintgetTotalRows(){
returntotalRows;
}


publicvoidsetTotalRows(inttotalRows){
this.totalRows=totalRows;
}


publicbooleanisHasPreviousPage(){
returnhasPreviousPage;
}

}

//测试类：
packagecom.Gavin.tools.util;

importjava.util.ArrayList;
importjava.util.List;

publicclassTestPagerModel{
publicstaticvoidmain(Stringargs[]){
List<String>list=newArrayList<String>();
list.add("a");
list.add("b");
list.add("c");
list.add("d");
list.add("e");
list.add("f");
list.add("g");
list.add("h");
list.add("h");
list.add("i");
list.add("j");
list.add("k");
list.add("l");
list.add("m");
PageModelpm=newPageModel(list,5);

Listsublist=pm.getObjects(3);
for(inti=0;i<sublist.size();i++){
System.out.println(sublist.get(i));
}
System.out.println(sublist.get(0));
}

}
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java中利用List的subList方法实现对List分页（简单易学）

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