package com.jspnews.util;import java.io.Serializable;
import java.util.List;/*** * <b> 分页通用类 </b>* * @author kangxu* @param <T>* */
public class Pager {/*** */private static final long serialVersionUID = 4542617637761955078L;/*** currentPage 当前页*/private int currentPage = 1;/*** pageSize 每页大小*/private int pageSize = 10;/*** pageTotal 总页数*/private int pageTotal;/*** recordTotal 总条数*/private int recordTotal = 0;/*** previousPage 前一页*/private int previousPage;/*** nextPage 下一页*/private int nextPage;/*** firstPage 第一页*/private int firstPage = 1;/*** lastPage 最后一页*/private int lastPage;/*** 拼接url*/private String url = "?p=";public String getUrl() {return url;}public void setUrl(String url) {this.url = url;}// 以下set方式是需要赋值的/*** 设置当前页 <br>* * @author kangxu* * @param currentPage*/public void setCurrentPage(int currentPage) {this.currentPage = currentPage;}/*** 设置每页大小,也可以不用赋值,默认大小为10条 <br>* * @author kangxu* * @param pageSize*/public void setPageSize(int pageSize) {this.pageSize = pageSize;}/*** 设置总条数,默认为0 <br>* * @author kangxu* * @param recordTotal*/public void setRecordTotal(int recordTotal) {this.recordTotal = recordTotal;otherAttr();}/*** 设置其他参数* * @author kangxu* */public void otherAttr() {// 总页数this.pageTotal = this.recordTotal % this.pageSize > 0 ? this.recordTotal / this.pageSize + 1: this.recordTotal / this.pageSize;// 第一页this.firstPage = 1;// 最后一页this.lastPage = this.pageTotal;// 前一页if (this.currentPage > 1) {this.previousPage = this.currentPage - 1;} else {this.previousPage = this.firstPage;}// 下一页if (this.currentPage < this.lastPage) {this.nextPage = this.currentPage + 1;} else {this.nextPage = this.lastPage;}}public int getCurrentPage() {return currentPage;}public int getPageSize() {return pageSize;}public int getPageTotal() {return pageTotal;}public int getRecordTotal() {return recordTotal;}public int getPreviousPage() {return previousPage;}public int getNextPage() {return nextPage;}public int getFirstPage() {return firstPage;}public int getLastPage() {return lastPage;}@Overridepublic String toString() {return "Pager [currentPage=" + currentPage + ", pageSize=" + pageSize + ", pageTotal=" + pageTotal+ ", recordTotal=" + recordTotal + ", previousPage=" + previousPage + ", nextPage=" + nextPage+ ", firstPage=" + firstPage + ", lastPage=" + lastPage + ", url=" + url + "]";}}

package com.jspnews.test;import com.jspnews.util.Pager;public class TestPager {public static void main(String[] args) {Pager pager = new Pager();pager.setCurrentPage(-1);pager.setPageSize(4);pager.setRecordTotal(21);System.out.println(pager.getPreviousPage() + "," + pager.getNextPage());pager.setCurrentPage(0);pager.setPageSize(4);pager.setRecordTotal(21);System.out.println(pager.getPreviousPage() + "," + pager.getNextPage());pager.setCurrentPage(1);pager.setPageSize(4);pager.setRecordTotal(15);System.out.println(pager.getPreviousPage() + "," + pager.getNextPage());pager.setCurrentPage(2);pager.setPageSize(4);pager.setRecordTotal(21);System.out.println(pager.getPreviousPage() + "," + pager.getNextPage());pager.setCurrentPage(3);pager.setPageSize(4);pager.setRecordTotal(21);System.out.println(pager.getPreviousPage() + "," + pager.getNextPage());pager.setCurrentPage(4);pager.setPageSize(4);pager.setRecordTotal(21);System.out.println(pager.getPreviousPage() + "," + pager.getNextPage());pager.setCurrentPage(5);pager.setPageSize(4);pager.setRecordTotal(21);System.out.println(pager.getPreviousPage() + "," + pager.getNextPage());pager.setCurrentPage(6);pager.setPageSize(4);pager.setRecordTotal(21);System.out.println(pager.getPreviousPage() + "," + pager.getNextPage());pager.setCurrentPage(7);pager.setPageSize(4);pager.setRecordTotal(21);System.out.println(pager.getPreviousPage() + "," + pager.getNextPage());}
}

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