分页工具

直接上代码：

package cn.asiatelecom.wlan.dao;

import java.util.List;

/**
* 用于分页的工具类
* @author 莫取网名
*/
public class Pager {

private List<T> list; //对象记录结果集private int total = 0; // 总记录数private int limit = 20; // 每页显示记录数private int pages = 1; // 总页数private int pageNumber = 1; // 当前页private boolean isFirstPage=false;        //是否为第一页private boolean isLastPage=false;         //是否为最后一页private boolean hasPreviousPage=false;   //是否有前一页private boolean hasNextPage=false;       //是否有下一页private int navigatePages=8; //导航页码数private int[] navigatePageNumbers;  //所有导航页号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){    //设置基本参数    this.total=total;    this.limit=limit;    this.pages=(this.total-1)/this.limit+1;    //根据输入可能错误的当前号码进行自动纠正    if(pageNumber<1){        this.pageNumber=1;    }else if(pageNumber>this.pages){        this.pageNumber=this.pages;    }else{        this.pageNumber=pageNumber;    }    //基本参数设定之后进行导航页面的计算    calcNavigatePageNumbers();    //以及页面边界的判定    judgePageBoudary();}/** * 计算导航页 */private void calcNavigatePageNumbers(){    //当总页数小于或等于导航页码数时    if(pages<=navigatePages){        navigatePageNumbers=new int[pages];        for(int i=0;i<pages;i++){            navigatePageNumbers[i]=i+1;        }    }else{ //当总页数大于导航页码数时        navigatePageNumbers=new int[navigatePages];        int startNum=pageNumber-navigatePages/2;        int endNum=pageNumber+navigatePages/2;        if(startNum<1){            startNum=1;            //(最前navPageCount页            for(int i=0;i<navigatePages;i++){                navigatePageNumbers[i]=startNum++;            }        }else if(endNum>pages){            endNum=pages;            //最后navPageCount页            for(int i=navigatePages-1;i>=0;i--){                navigatePageNumbers[i]=endNum--;            }        }else{            //所有中间页            for(int i=0;i<navigatePages;i++){                navigatePageNumbers[i]=startNum++;            }        }    }}/** * 判定页面边界 */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;}/** * 得到当前页的内容 * @return {List} */public List<T> getList() {    return list;}/** * 得到记录总数 * @return {int} */public int getTotal() {    return total;}/** * 得到每页显示多少条记录 * @return {int} */public int getLimit() {    return limit;}/** * 得到页面总数 * @return {int} */public int getPages() {    return pages;}/** * 得到当前页号 * @return {int} */public int getPageNumber() {    return pageNumber;}/** * 得到所有导航页号  * @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(){    String str=new String();    str= "[" +        "total="+total+        ",pages="+pages+        ",pageNumber="+pageNumber+        ",limit="+limit+        //",navigatePages="+navigatePages+        ",isFirstPage="+isFirstPage+        ",isLastPage="+isLastPage+        ",hasPreviousPage="+hasPreviousPage+        ",hasNextPage="+hasNextPage+        ",navigatePageNumbers=";    int len=navigatePageNumbers.length;    if(len>0)str+=(navigatePageNumbers[0]);    for(int i=1;i<len;i++){        str+=(" "+navigatePageNumbers[i]);    }    //sb+=",list="+list;    str+="]";    return str;}

}