package test;
import java.util.List;
public class Pager<T> 
{
private List<T> list; //對(duì)象記錄結(jié)果集
private int total = 0; // 總記錄數(shù)
private int limit = 20; // 每頁(yè)顯示記錄數(shù)
private int pages = 1; // 總頁(yè)數(shù)
private int pageNumber = 1; // 當(dāng)前頁(yè)
private boolean isFirstPage=false; //是否為第一頁(yè)
private boolean isLastPage=false; //是否為最后一頁(yè)
private boolean hasPreviousPage=false; //是否有前一頁(yè)
private boolean hasNextPage=false; //是否有下一頁(yè)
private int navigatePages=8; //導(dǎo)航頁(yè)碼數(shù)
private int[] navigatePageNumbers; //所有導(dǎo)航頁(yè)號(hào)
public Pager(int total, int pageNumber) {
init(total, pageNumber, limit);
}
public Pager(int total, int pageNumber, int limit) {
init(total, pageNumber, limit);
}
private void init(int total, int pageNumber, int limit){
//設(shè)置基本參數(shù)
this.total=total;
this.limit=limit;
this.pages=(this.total-1)/this.limit+1;
//根據(jù)輸入可能錯(cuò)誤的當(dāng)前號(hào)碼進(jìn)行自動(dòng)糾正
if(pageNumber<1){
this.pageNumber=1;
}else if(pageNumber>this.pages){
this.pageNumber=this.pages;
}else{
this.pageNumber=pageNumber;
}
//基本參數(shù)設(shè)定之后進(jìn)行導(dǎo)航頁(yè)面的計(jì)算
calcNavigatePageNumbers();
//以及頁(yè)面邊界的判定
judgePageBoudary();
}
/** *//**
* 計(jì)算導(dǎo)航頁(yè)
*/
private void calcNavigatePageNumbers(){
//當(dāng)總頁(yè)數(shù)小于或等于導(dǎo)航頁(yè)碼數(shù)時(shí)
if(pages<=navigatePages){
navigatePageNumbers=new int[pages];
for(int i=0;i<pages;i++){
navigatePageNumbers[i]=i+1;
}
}else{ //當(dāng)總頁(yè)數(shù)大于導(dǎo)航頁(yè)碼數(shù)時(shí)
navigatePageNumbers=new int[navigatePages];
int startNum=pageNumber-navigatePages/2;
int endNum=pageNumber+navigatePages/2;
if(startNum<1){
startNum=1;
//(最前navigatePages頁(yè)
for(int i=0;i<navigatePages;i++){
navigatePageNumbers[i]=startNum++;
}
}else if(endNum>pages){
endNum=pages;
//最后navigatePages頁(yè)
for(int i=navigatePages-1;i>=0;i--){
navigatePageNumbers[i]=endNum--;
}
}else{
//所有中間頁(yè)
for(int i=0;i<navigatePages;i++){
navigatePageNumbers[i]=startNum++;
}
}
}
}
/** *//**
* 判定頁(yè)面邊界
*/
private void judgePageBoudary(){
isFirstPage = pageNumber == 1;
isLastPage = pageNumber == pages && pageNumber!=1;
hasPreviousPage = pageNumber > 1;
hasNextPage = pageNumber < pages;
}
public void setList(List<T> list) {
this.list = list;
}
/** *//**
* 得到當(dāng)前頁(yè)的內(nèi)容
* @return {List}
*/
public List<T> getList() {
return list;
}
/** *//**
* 得到記錄總數(shù)
* @return {int}
*/
public int getTotal() {
return total;
}
/** *//**
* 得到每頁(yè)顯示多少條記錄
* @return {int}
*/
public int getLimit() {
return limit;
}
/** *//**
* 得到頁(yè)面總數(shù)
* @return {int}
*/
public int getPages() {
return pages;
}
/** *//**
* 得到當(dāng)前頁(yè)號(hào)
* @return {int}
*/
public int getPageNumber() {
return pageNumber;
}
/** *//**
* 得到所有導(dǎo)航頁(yè)號(hào)
* @return {int[]}
*/
public int[] getNavigatePageNumbers() {
return navigatePageNumbers;
}
public boolean isFirstPage() {
return isFirstPage;
}
public boolean isLastPage() {
return isLastPage;
}
public boolean hasPreviousPage() {
return hasPreviousPage;
}
public boolean hasNextPage() {
return hasNextPage;
}
public String toString(){
StringBuffer sb=new StringBuffer();
sb.append("[")
.append("total=").append(total)
.append(",pages=").append(pages)
.append(",pageNumber=").append(pageNumber)
.append(",limit=").append(limit)
.append(",isFirstPage=").append(isFirstPage)
.append(",isLastPage=").append(isLastPage)
.append(",hasPreviousPage=").append(hasPreviousPage)
.append(",hasNextPage=").append(hasNextPage)
.append(",navigatePageNumbers=");
int len=navigatePageNumbers.length;
if(len>0)sb.append(navigatePageNumbers[0]);
for(int i=1;i<len;i++){
sb.append(' ');
sb.append(navigatePageNumbers[i]);
}
sb.append(",list.size="+list.size());
sb.append("]");
return sb.toString();
}
}
比較實(shí)用，轉(zhuǎn)載
posted on 2011-02-24 17:32
soken 閱讀(217)
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