java – 分页类

pager.java

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;
}@Override
public String toString() {
return "Pager [currentPage=" + currentPage + ", pageSize=" + pageSize + ", pageTotal=" + pageTotal
+ ", recordTotal=" + recordTotal + ", previousPage=" + previousPage + ", nextPage=" + nextPage
+ ", firstPage=" + firstPage + ", lastPage=" + lastPage + ", url=" + url + "]";
}}

test

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());
}
}

result

1,0
1,1
1,2
1,3
2,4
3,5
4,6
5,6
6,6