//13年写的,今天(17)拷贝到博客园
package com.sicdt.sicsign.web.utils;
import java.io.Serializable;
import java.util.List;
/**
* @author shizhenwei
*
* @param <T>用于向前台返还List所用
*/
public class PageInfo<T> implements Serializable {
private static final long serialVersionUID = 1L;
//每页显示的记录数
private Integer pageSize;
//当前页码数
private Integer pageNum;
//总记录数
private Integer rowCount;
//总页码数
private Integer pageCount;
//查询的时候从多少记录开始
private Integer rowStart;
//每页显示多少页码
private Integer everyPageTabsCount;
//每页显示的开始页码数
private Integer everyPageStart;
//每页显示的结束页码数
private Integer everyPageEnd;
//是否有上一页
private boolean hasPrevious = false;
//首页
private Integer firstPageNum;
//上一页
private Integer priviousPageNum;
//是否有下一页
private boolean hasNext = false;
//下一页
private Integer nextPageNum;
//尾页
private Integer endPageNum;
//存放本次分页查询出来的数据
private List<T> list;
/**
* 通过构造器计算出其他属性的值
* @param pageSize
* @param pageNum
* @param rowCount
*/
public PageInfo(Integer pageNum,Integer pageSize,Integer rowCount,Integer everyPageTabsCount) {
//每页显示的记录数
this.pageSize = pageSize == null ? 10 : pageSize;
//当前页码数
this.pageNum = pageNum == null ? 1 : pageNum;
//总记录数
this.rowCount = rowCount == null ? 0 : rowCount;
//每页显示多少页码 默认10,可以set
this.everyPageTabsCount = everyPageTabsCount == null ? 10 : everyPageTabsCount;
//总页码数
this.pageCount = (int) Math.ceil(this.rowCount * 1.0 / this.pageSize);
//判断当前页码数是否大于总页码数
if (this.pageNum > this.pageCount && this.pageCount >= 1) {
this.pageNum = this.pageCount;
}
//查询的时候从多少记录开始
this.rowStart = (this.pageNum - 1) * this.pageSize;
//每页显示的开始页码数
this.everyPageStart = (this.pageNum - this.everyPageTabsCount / 2) > 0 ? (this.pageNum - this.everyPageTabsCount / 2) : 1;
/***** 无论从第几页开始都会以固定的页数进行显示,当总页数小于固定页数,将全部显示总页数****/
int cenNum = (int) Math.ceil((this.everyPageTabsCount / 2.0));
if(this.pageCount>=this.everyPageTabsCount && this.pageNum<=(this.everyPageTabsCount / 2)){
this.everyPageEnd = this.everyPageTabsCount;
}else if(this.pageCount<=this.everyPageTabsCount){
this.everyPageEnd = this.pageCount;
}else{
//每页显示的结束页码数
this.everyPageEnd = (this.pageNum + cenNum - 1) > this.pageCount ? this.pageCount : (this.pageNum + cenNum - 1);
}
if(this.pageCount>=this.everyPageTabsCount && this.pageNum>(this.pageCount-(cenNum - 1))){
this.everyPageStart=this.pageCount-(this.everyPageTabsCount-1);
}
//是否有上一页
if (this.pageNum > 1) {
this.hasPrevious = true;
this.firstPageNum = 1;
this.priviousPageNum = this.pageNum - 1;
}
//是否有下一页
if (this.pageNum < this.pageCount) {
this.hasNext = true;
this.nextPageNum = this.pageNum + 1;
this.endPageNum = this.pageCount;
}
}
public Integer getPageSize() {
return pageSize;
}
public Integer getPageNum() {
return pageNum;
}
public Integer getRowCount() {
return rowCount;
}
public Integer getPageCount() {
return pageCount;
}
public Integer getRowStart() {
return rowStart;
}
public Integer getEveryPageStart() {
return everyPageStart;
}
public Integer getEveryPageEnd() {
return everyPageEnd;
}
public boolean isHasPrevious() {
return hasPrevious;
}
public Integer getFirstPageNum() {
return firstPageNum;
}
public Integer getPriviousPageNum() {
return priviousPageNum;
}
public boolean isHasNext() {
return hasNext;
}
public Integer getNextPageNum() {
return nextPageNum;
}
public Integer getEndPageNum() {
return endPageNum;
}
public List<T> getList() {
return list;
}
public void setList(List<T> list) {
this.list = list;
}
public Integer getEveryPageTabsCount() {
return everyPageTabsCount;
}
public void setEveryPageTabsCount(Integer everyPageTabsCount) {
this.everyPageTabsCount = everyPageTabsCount;
}
}