package cn.ksource.core.util;
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import java.io.Serializable;
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import java.util.List;
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@SuppressWarnings("serial")
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public class PageBeanUtil<T> implements Serializable
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{
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private List<T> list; //要返回的某一页的记录列表
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private long allRow; //总记录数
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private int totalPage; //总页数
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private int currentPage; //当前页
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private int pageSize; //每页记录数
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private int stratPage; //滚动条开始页码
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private int endPage; //滚动条结束页码
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private final int pageList=10; //滚动条长度
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private boolean isFirstPage; //是否为第一页
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private boolean isLastPage; //是否为最后一页
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private boolean hasPreviousPage; //是否有前一页
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private boolean hasNextPage; //是否有下一页
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public List<T> getList() {
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return list;
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}
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public void setList(List<T> list) {
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this.list = list;
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}
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public long getAllRow() {
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return allRow;
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}
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public void setAllRow(long allRow) {
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this.allRow = allRow;
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}
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public int getTotalPage() {
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return totalPage;
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}
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public void setTotalPage(int totalPage) {
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this.totalPage = totalPage;
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}
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public int getCurrentPage() {
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return currentPage;
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}
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public void setCurrentPage(int currentPage) {
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this.currentPage = currentPage;
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}
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public int getPageSize() {
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return pageSize;
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}
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public void setPageSize(int pageSize) {
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this.pageSize = pageSize;
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}
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/**
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* 初始化分页信息
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*/
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public void init(){
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this.isFirstPage = isFirstPage();
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this.isLastPage = isLastPage();
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this.hasPreviousPage = isHasPreviousPage();
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this.hasNextPage = isHasNextPage();
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}
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/**
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* 以下判断页的信息,只需getter方法(is方法)即可
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* @return
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*/
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public boolean isFirstPage() {
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return currentPage == 1; // 如是当前页是第1页
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}
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public boolean isLastPage() {
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return currentPage == totalPage; //如果当前页是最后一页
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}
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public boolean isHasPreviousPage() {
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return currentPage != 1; //只要当前页不是第1页
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}
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public boolean isHasNextPage() {
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return currentPage != totalPage; //只要当前页不是最后1页
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}
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/**
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* 计算总页数,静态方法,供外部直接通过类名调用
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* @param pageSize 每页记录数
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* @param allRow 总记录数
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* @return 总页数
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*/
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public static int countTotalPage(final int pageSize,final long allRow){
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int totalPage = (int) (allRow % pageSize == 0 ? allRow/pageSize : allRow/pageSize+1);
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return totalPage;
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}
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/**
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* 计算当前页开始记录
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* @param pageSize 每页记录数
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* @param currentPage 当前第几页
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* @return 当前页开始记录号
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*/
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public static int countOffset(final int pageSize,final int currentPage){
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final int offset = pageSize*(currentPage-1);
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return offset;
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}
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/**
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* 计算当前页,若为0或者请求的URL中没有"?page=",则用1代替
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* @param page 传入的参数(可能为空,即0,则返回1)
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* @return 当前页
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*/
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public static int countCurrentPage(int page){
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final int curPage = (page==0?1:page);
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return curPage;
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}
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public int getStratPage() {
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if(this.currentPage>this.pageList/2){
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if((totalPage-currentPage)<5&&totalPage>10){
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return this.stratPage=totalPage-9;
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}
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return this.stratPage=this.currentPage-4;
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}
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else
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{
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return this.stratPage = 1;
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}
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}
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public int getEndPage() {
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if(this.totalPage<this.pageList){
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return this.endPage=this.totalPage;
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}
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else{
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if((totalPage-currentPage)<5){
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return this.endPage=totalPage;
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}
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return this.endPage = this.stratPage+9;
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}
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}
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}
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