前言

为了复用，记载一些以前写过的工具类、方法

page类

    import java.util.List;

    /**

     * Created by ozc on 2017/3/1.

     */

    public class Page {

        //保存着分页的数据

        private List<Customer> list;

        //总记录数

        private long totalRecord;

        //每页显示记录数，这里我规定每页显示3条

        private int linesize = 3;

        //总页数

        private int totalPageCount;

        //当前显示的页数

        private int currentPageCount;

        //开始取的记录位置

        private int startIndex;

        //记录JSP页面开始的页数和结束的页数

        private int startPage;

        private int endPage;

        private String url;

        public Page() {

        }

        public Page(int currentPageCount, long totalRecord) {

            //将传递进来的currentPageCount初始化

            this.currentPageCount = currentPageCount;

            //总页数

            totalPageCount = (int) (totalRecord % linesize == 0 ? totalRecord / linesize : totalRecord / linesize + 1);

            this.totalRecord = totalRecord;

            //开始取数据的位置

            startIndex = (currentPageCount - 1) * linesize;

            //如果当前页小于10，那么开始页为1，结束页为10就行了

            if (this.currentPageCount <= 10) {

                this.startPage = 1;

                this.endPage = 10;

            } else {

                this.startPage = this.currentPageCount - 4;

                this.endPage = this.currentPageCount + 5;

                //加减后页数越界的情况

                if (startPage < 1) {

                    this.startPage = 1;

                    this.endPage = 10;

                }

                if (endPage > totalPageCount) {

                    this.startPage = this.currentPageCount - 9;

                    this.endPage = this.totalPageCount;

                }

            }

        }

        public String getUrl() {

            return url;

        }

        public void setUrl(String url) {

            this.url = url;

        }

        public int getStartIndex() {

            return startIndex;

        }

        public void setCurrentPageCount(int currentPageCount) {

            this.currentPageCount = currentPageCount;

        }

        public void setStartIndex(int startIndex) {

            this.startIndex = startIndex;

        }

        public int getStartPage() {

            return startPage;

        }

        public void setStartPage(int startPage) {

            this.startPage = startPage;

        }

        public int getEndPage() {

            return endPage;

        }

        public void setEndPage(int endPage) {

            this.endPage = endPage;

        }

        public int getTotalPageCount() {

            return totalPageCount;

        }

        public void setTotalPageCount(int totalPageCount) {

            this.totalPageCount = totalPageCount;

        }

        public List<Customer> getList() {

            return list;

        }

        public void setList(List<Customer> list) {

            this.list = list;

        }

        public long getTotalRecord() {

            return totalRecord;

        }

        public void setTotalRecord(long totalRecord) {

            this.totalRecord = totalRecord;

        }

        public int getLinesize() {

            return linesize;

        }

        public void setLinesize(int linesize) {

            this.linesize = linesize;

        }

        public long getCurrentPageCount() {

            return currentPageCount;

        }

        public void setCurrentPageCount(long currentPageCount) {

            this.currentPageCount = (int) currentPageCount;

        }

    }

显示页面JSP

<%--

  Created by IntelliJ IDEA.

  User: ozc

  Date: 2017/3/1

  Time: 21:17

  To change this template use File | Settings | File Templates.

--%>

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<%--显示当前页数--%>

当前页数是：[${page.currentPageCount}]&nbsp;&nbsp;&nbsp;

<%--如果当前的页码大于1，才显示上一步--%>

<c:if test="${page.currentPageCount>1}">

    <%--把传递过去的页码-1就行了--%>

    <a href="${page.url}?currentPageCount=${page.currentPageCount-1}">

        上一步

    </a>

</c:if>

<%--提供页数的界面--%>

<c:forEach var="pageNum" begin="${page.startPage}" end="${page.endPage}">

    <a href="${page.url}?currentPageCount=${pageNum}">

        [${pageNum}]&nbsp;

    </a>

</c:forEach>

<%--如果当前的页码小于总页数，才显示下一步--%>

<c:if test="${page.currentPageCount<page.totalPageCount}">

    <%--把传递过去的页码-1就行了--%>

    <a href="${page.url}?currentPageCount=${page.currentPageCount+1}">

        下一步

    </a>&nbsp;&nbsp;

</c:if>

<input type="text" id="currentPageCount">

<input type="button" value="跳转" onclick="goPage()">

总页数是：${page.totalPageCount}&nbsp;&nbsp;

总记录数是：${page.totalRecord}

<script type="text/javascript">

    /*既然写上了JavaScript代码了，就顺便验证输入框输入的数据是否合法吧*/

    function goPage() {

        /*获取输入框控件*/

        var input = document.getElementById("currentPageCount");

        /*获取输入框的数据*/

        var value = input.value;

        if(value==null || value==""){

            alert("请输入页码");

            return false;

        }

        if(!value.match("\\d+")){

            alert("请输入数字");

            return false;

        }

        if(value<1 || value>${page.totalPageCount}){

            alert("请输入合法数据");

            return false ;

        }

        window.location.href="${page.url}?currentPageCount="+value;

    }

</script>