背景：

最近在学习jsp，使用到了分页功能，从网上，查了半天，也没找到合适的。于是就自己写了这个分页标签。

此标签不会生成样式代码，只是生成一系列的<a>标签，方便了显示样式的自定义。本人是jsp初学者，只是分享一下经验，各位大神不要喷我。

 <a href="postlist.do?pn=1">首页</a> 

 <a href="postlist.do?pn=1">1</a> 

 <a href="postlist.do?pn=2">2</a> 

 <a href="postlist.do?pn=3">3</a> 

 <a href="postlist.do?pn=4">4</a> 

 <a href="postlist.do?pn=5">5</a> 

 <a href="postlist.do?pn=6">6</a> 

 <a href="postlist.do?pn=7">7</a> 

 <a href="postlist.do?pn=8">8</a> 

 <a href="postlist.do?pn=9">9</a> 

 <span>10</span>                  <!--当前页-->

 <a href="postlist.do?pn=11">...</a> 

 <a href="postlist.do?pn=14">尾页</a>

效果图

一、实现lhp2012.tld标签描述文件

其存放路径为：WEB-INF\tlds\lhp2012.tld

<?xml version="1.0" encoding="UTF-8"?>  
    <!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"  
"http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
<taglib>
    <tlib-version>1.0</tlib-version>    <jsp-version>1.2</jsp-version>
    <short-name>lhp2012</short-name>
    <tag>
        <name>pagination</name>        
        <tag-class>com.lhp2012.util.Pagination</tag-class>      
         <body-content>empty</body-content>
        <attribute>
            <name>pageTotal</name>
            <required>true</required>
            <rtexprvalue>true</rtexprvalue>
        </attribute>

        <attribute>
            <name>pageNow</name>
            <required>true</required>
            <rtexprvalue>true</rtexprvalue>
        </attribute>

        <attribute>
            <name>pageUrl</name>
            <required>true</required>
            <rtexprvalue>true</rtexprvalue>
        </attribute>
        
        <attribute>
            <name>withFirstLast</name>
            <required>true</required>
            <rtexprvalue>true</rtexprvalue>
        </attribute>

    </tag>
</taglib>

二、实现java类com.lhp2012.util.Pagination

package com.coolpeng.framework.mvc.jsptag;

import java.io.IOException;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;

public class TmsPagination extends TagSupport {

    /**
     * Author lhp2012
     */
    private static final int linkSize = 10;
    private int pageTotal;
    private int pageNow;
    private String pageUrl;
    private boolean withFirstLast;// 是否输出“首页”“尾页”标记

    public void setWithFirstLast(boolean withFirstLast) {
        this.withFirstLast = withFirstLast;
    }

    public void setPageTotal(int pageTotal) {
        this.pageTotal = pageTotal;
    }

    public void setPageNow(int pageNow) {
        this.pageNow = pageNow;
    }

    public void setPageUrl(String pageUrl) {
        this.pageUrl = pageUrl;
    }

    private String generateOneLink(int i) {
        StringBuffer s = new StringBuffer();

        if (i == this.pageNow) {
            s.append(" <span>");
            s.append(i);
            s.append("</span> ");
        } else {
            s.append(" <a href=\"");
            s.append(pageUrl);
            s.append(i);
            s.append("\">");
            s.append(i);
            s.append("</a> ");
        }

        return s.toString();
    }

    private void generateLinks(int begin, int end) throws JspTagException {
        try {
            JspWriter out = pageContext.getOut();
            for (int i = begin; i <= end; i++) {
                out.print(this.generateOneLink(i));
            }

        } catch (IOException ex2) {
            throw new JspTagException("错误");
        }
    }

    private void generateSpecialLink(int i, String text) {
        StringBuffer s = new StringBuffer();
        s.append(" <a href=\"");
        s.append(pageUrl);
        s.append(i);
        s.append("\">");
        s.append(text);
        s.append("</a> ");
        JspWriter out = pageContext.getOut();
        try {
            out.print(s.toString());
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    private int pageNowGroup() {// 从1开始的
        return ((this.pageNow - 1) / linkSize) + 1;
    }

    private int groupSize() {// 从1开始
        return ((this.pageTotal - 1) / linkSize) + 1;
    }

    private boolean isNowFirstGroup() {
        return this.pageNowGroup() == 1;
    }

    private boolean isNowLastGroup() {
        return this.pageNowGroup() == this.groupSize();
    }

    private int getGroupBeginNoByNow() {
        return linkSize * (pageNowGroup() - 1) + 1;
    }

    private int getGroupEndNoByNow() {
        if (this.isNowLastGroup())
            return this.pageTotal;
        else
            return this.getGroupBeginNoByNow() + 9;
    }

    private void generateNextGroupLink(int begin) throws IOException {
        generateSpecialLink(begin, "...");
    }

    private void generatePreGroupLink(int end) {
        this.generateSpecialLink(end, "...");
    }

    private void generateAllLinks() {
        try {
            int begin = this.getGroupBeginNoByNow();
            int end = this.getGroupEndNoByNow();
            if (this.pageTotal <= linkSize) {
                this.generateLinks(1, this.pageTotal);
            } else {
                if (isNowFirstGroup()) {
                    this.generateLinks(begin, end);
                    this.generateNextGroupLink(end + 1);
                } else if (isNowLastGroup()) {
                    this.generatePreGroupLink(begin - 1);
                    this.generateLinks(begin, end);
                } else {
                    this.generatePreGroupLink(begin - 1);
                    this.generateLinks(begin, end);
                    this.generateNextGroupLink(end + 1);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private void generateAllLinksWithFirstLast() {
        this.generateSpecialLink(1, "首页");
        this.generateAllLinks();
        this.generateSpecialLink(this.pageTotal, "尾页");
    }

    @Override
    public int doStartTag() throws JspException {
        return EVAL_BODY_INCLUDE;
    }

    @Override
    public int doEndTag() throws JspException {

        JspWriter out = pageContext.getOut();
        try {
            out.print("<div class='cp-pagination'>");

            if (this.withFirstLast){
                this.generateAllLinksWithFirstLast();
            }
            else {
                this.generateAllLinks();
            }

            out.print("</div>");
        } catch (IOException e) {
            e.printStackTrace();
        }
        return EVAL_PAGE;
    }
}

三、修改web.xml文件

在</web-app>之上添加如下内容

<jsp-config>
        <taglib>
            <taglib-uri>/tld/lhp2012</taglib-uri>
            <taglib-location>/WEB-INF/tlds/lhp2012.tld</taglib-location>
        </taglib>
    </jsp-config>

四、使用分页标签

一、在jsp页面上部加入

<%@ taglib uri="/tld/lhp2012" prefix="lhp" %>

二、在需要加入分页页码的地方，这样使用标签

    <lhp:pagination withFirstLast="true" pageTotal="${totalPage}" pageUrl="postlist.do?pn=" pageNow="${pn}" />

三、标签参数说明

withFirstLast：是否显示“首页”“尾页”

pageTotal：共计有多少页，是个数值

pageUrl：页面url前缀

pageNow：当前第几页

.cp-pagination{
    height: 40px;
    font-size: 13px;
}

.cp-pagination span,.cp-pagination a{
    color: #000;
    line-height: 30px;
    width: 30px;
    margin-right: 10px;
    display: block;
    float: left;
    border: 1px solid #DDDDDD;
    text-align: center;
}

.cp-pagination span{
    background-color: #187dd7;
    color: #ffffff;
}
.cp-pagination a{
    color: #187dd7;
}

附：后台struts2 Action 示例代码

public class PostList extends ActionSupport{
    private PostDAO postDAO;
    private List<Post> postList;
    private int totalPage;
    private int pageSize;
    private int pn;
    private User loginUser;
    
     
    public String execute() throws Exception {
        if(pn<=0)pn=1;
        this.pageSize=15;//每页显示10个帖子
        this.totalPage=postDAO.getPageCount(pageSize);
        this.postList=postDAO.postListPage(pn, pageSize);
        this.loginUser=(User)this.session.getAttribute(Constants.USER_KEY);
        return SUCCESS;
    }
         

          //省略getter、setter

｝

特别提醒：此标签仅仅是根据几个参数生成html页面的一系列<a>标签，后台业务逻辑没有在这个标签中涉及。

就这样吧，也不知道其他像我这样的初学者能不能看懂。

2015年10月16日22:00:42更新，代码

package com.coolpeng.framework.mvc.jsptag;

import java.io.IOException;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;

public class TmsPagination extends TagSupport {

    /**
     * Author lhp2012
     */
    private static final int linkSize = 10;
    private int pageTotal;
    private int pageNow;
    private String pageUrl;
    private boolean withFirstLast;// 是否输出“首页”“尾页”标记

    public TmsPagination(int pageTotal, int pageNow, String pageUrl, boolean withFirstLast) {
        this.pageTotal = pageTotal;
        this.pageNow = pageNow;
        this.pageUrl = pageUrl;
        this.withFirstLast = withFirstLast;
    }

    public TmsPagination() {
    }

    public void setWithFirstLast(boolean withFirstLast) {
        this.withFirstLast = withFirstLast;
    }

    public void setPageTotal(int pageTotal) {
        this.pageTotal = pageTotal;
    }

    public void setPageNow(int pageNow) {
        this.pageNow = pageNow;
    }
    public void setPageUrl(String pageUrl) {
        this.pageUrl = pageUrl;
    }

    private String generateOneLink(int i) {
        StringBuffer s = new StringBuffer();

        if (i == this.pageNow) {
            s.append(" <span>");
            s.append(i);
            s.append("</span> ");
        } else {
            s.append(" <a href=\"");
            s.append(pageUrl);
            s.append(i);
            s.append("\">");
            s.append(i);
            s.append("</a> ");
        }

        return s.toString();
    }

    private String generateLinks(int begin, int end) {
        StringBuffer sb = new StringBuffer();
        for (int i = begin; i <= end; i++) {
            sb.append(this.generateOneLink(i));
        }
        return sb.toString();
    }

    private String generateSpecialLink(int i, String text) {
        StringBuffer s = new StringBuffer();
        s.append(" <a href=\"");
        s.append(pageUrl);
        s.append(i);
        s.append("\">");
        s.append(text);
        s.append("</a> ");
        return s.toString();
    }

    private int pageNowGroup() {// 从1开始的
        return ((this.pageNow - 1) / linkSize) + 1;
    }

    private int groupSize() {// 从1开始
        return ((this.pageTotal - 1) / linkSize) + 1;
    }

    private boolean isNowFirstGroup() {
        return this.pageNowGroup() == 1;
    }

    private boolean isNowLastGroup() {
        return this.pageNowGroup() == this.groupSize();
    }

    private int getGroupBeginNoByNow() {
        return linkSize * (pageNowGroup() - 1) + 1;
    }

    private int getGroupEndNoByNow() {
        if (this.isNowLastGroup())
            return this.pageTotal;
        else
            return this.getGroupBeginNoByNow() + 9;
    }

    private String generateNextGroupLink(int begin) {
        return generateSpecialLink(begin, "...");
    }

    private String generatePreGroupLink(int end) {
        return this.generateSpecialLink(end, "...");
    }

    private String generateAllLinks() {
        StringBuffer sb = new StringBuffer();

        int begin = this.getGroupBeginNoByNow();
        int end = this.getGroupEndNoByNow();
        if (this.pageTotal <= linkSize) {
            sb.append(this.generateLinks(1, this.pageTotal));
        } else {
            if (isNowFirstGroup()) {
                sb.append(this.generateLinks(begin, end));
                sb.append(this.generateNextGroupLink(end + 1));
            } else if (isNowLastGroup()) {
                sb.append(this.generatePreGroupLink(begin - 1));
                sb.append(this.generateLinks(begin, end));
            } else {
                sb.append(this.generatePreGroupLink(begin - 1));
                sb.append(this.generateLinks(begin, end));
                sb.append(this.generateNextGroupLink(end + 1));
            }
        }

        return sb.toString();
    }


    public String toPaginationHtml() {
        StringBuffer sb = new StringBuffer();
        sb.append("<div class='cp-pagination'>");

        if (this.withFirstLast) {
            sb.append(this.generateSpecialLink(1, "首页"));
            sb.append(this.generateAllLinks());
            sb.append(this.generateSpecialLink(this.pageTotal, "尾页"));
        } else {
            sb.append(this.generateAllLinks());
        }

        sb.append("</div>");

        return sb.toString();
    }


    @Override
    public int doStartTag() throws JspException {
        return EVAL_BODY_INCLUDE;
    }

    @Override
    public int doEndTag() throws JspException {
        JspWriter out = pageContext.getOut();
        try {
            String html = toPaginationHtml();
            out.print(html);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return EVAL_PAGE;
    }
}

package com.coolpeng.framework.mvc.jsptag;

import com.coolpeng.framework.db.PageResult;

/**
 * Created by Administrator on 2015/10/16.
 */
public class TmsPaginationConvert {

    /**
     * Author lhp2012
     */
    private static final int linkSize = 10;
    private int pageTotal;
    private int pageNow;
    private String pageUrl;
    private boolean withFirstLast = true;// 是否输出“首页”“尾页”标记

    public TmsPaginationConvert(int pageTotal, int pageNow, String pageUrl, boolean withFirstLast) {
        this.pageTotal = pageTotal;
        this.pageNow = pageNow;
        this.pageUrl = pageUrl;
        this.withFirstLast = withFirstLast;
    }

    public TmsPaginationConvert() {

    }
    

    public void setWithFirstLast(boolean withFirstLast) {
        this.withFirstLast = withFirstLast;
    }

    public void setPageTotal(int pageTotal) {
        this.pageTotal = pageTotal;
    }

    public void setPageNow(int pageNow) {
        this.pageNow = pageNow;
    }
    public void setPageUrl(String pageUrl) {
        this.pageUrl = pageUrl;
    }

    private String generateOneLink(int i) {
        StringBuffer s = new StringBuffer();

        if (i == this.pageNow) {
            s.append(" <span>");
            s.append(i);
            s.append("</span> ");
        } else {
            s.append(" <a href=\"");
            s.append(pageUrl);
            s.append(i);
            s.append("\">");
            s.append(i);
            s.append("</a> ");
        }

        return s.toString();
    }

    private String generateLinks(int begin, int end) {
        StringBuffer sb = new StringBuffer();
        for (int i = begin; i <= end; i++) {
            sb.append(this.generateOneLink(i));
        }
        return sb.toString();
    }

    private String generateSpecialLink(int i, String text) {
        StringBuffer s = new StringBuffer();
        s.append(" <a href=\"");
        s.append(pageUrl);
        s.append(i);
        s.append("\">");
        s.append(text);
        s.append("</a> ");
        return s.toString();
    }

    private int pageNowGroup() {// 从1开始的
        return ((this.pageNow - 1) / linkSize) + 1;
    }

    private int groupSize() {// 从1开始
        return ((this.pageTotal - 1) / linkSize) + 1;
    }

    private boolean isNowFirstGroup() {
        return this.pageNowGroup() == 1;
    }

    private boolean isNowLastGroup() {
        return this.pageNowGroup() == this.groupSize();
    }

    private int getGroupBeginNoByNow() {
        return linkSize * (pageNowGroup() - 1) + 1;
    }

    private int getGroupEndNoByNow() {
        if (this.isNowLastGroup())
            return this.pageTotal;
        else
            return this.getGroupBeginNoByNow() + 9;
    }

    private String generateNextGroupLink(int begin) {
        return generateSpecialLink(begin, "...");
    }

    private String generatePreGroupLink(int end) {
        return this.generateSpecialLink(end, "...");
    }

    private String generateAllLinks() {
        StringBuffer sb = new StringBuffer();

        int begin = this.getGroupBeginNoByNow();
        int end = this.getGroupEndNoByNow();
        if (this.pageTotal <= linkSize) {
            sb.append(this.generateLinks(1, this.pageTotal));
        } else {
            if (isNowFirstGroup()) {
                sb.append(this.generateLinks(begin, end));
                sb.append(this.generateNextGroupLink(end + 1));
            } else if (isNowLastGroup()) {
                sb.append(this.generatePreGroupLink(begin - 1));
                sb.append(this.generateLinks(begin, end));
            } else {
                sb.append(this.generatePreGroupLink(begin - 1));
                sb.append(this.generateLinks(begin, end));
                sb.append(this.generateNextGroupLink(end + 1));
            }
        }

        return sb.toString();
    }


    public String toPaginationHtml() {
        StringBuffer sb = new StringBuffer();
        sb.append("<div class='cp-pagination'>");

        if (this.withFirstLast) {
            sb.append(this.generateSpecialLink(1, "首页"));
            sb.append(this.generateAllLinks());
            sb.append(this.generateSpecialLink(this.pageTotal, "尾页"));
        } else {
            sb.append(this.generateAllLinks());
        }

        sb.append("</div>");

        return sb.toString();
    }

}

JavaScript 版本的分页

function isArray(obj) {
    return Object.prototype.toString.call(obj) === "[object Object]";
}


function isFunction(obj) {
    return Object.prototype.toString.call(obj) === "[object Function]";
}


/**
 * demo1:
 *   {
 *      pageNumber:1,
 *      pageCount:10,
 *      linkRender:function(p){
 *          return "<a>"
 *      }
 *   }
 *
 *
 *   demo2:
 *   {
 *      pageNumber:1,
 *      recordCount:10,
 *      linkRender:"/blog/dsds?pn="
 *   }
 * @param config
 */
function toPagination(config) {

    var PRE_BUTTON = "pre";
    var PRE_GROUP_BUTTON = "preGroup";
    var NEXT_BUTTON = "next";
    var NEXT_GROUP_BUTTON = "nextGroup";
    var HOME_BUTTON = "home";

    var linkSize = config.linkSize || 10;
    var pageNumber = config.pageNumber || 1;// 当前是第几页
    var recordCount = config.recordCount || 0;
    var pageSize = config.pageSize || 20;
    var pageCount = config.pageCount || (function () {  //总共有多少页
            var pageCount = parseInt(config.recordCount / pageSize, 10);
            pageCount = (config.recordCount % pageSize === 0) ? pageCount : (pageCount + 1);
            return pageCount;
        })();
    var buttons = config.buttons || [HOME_BUTTON, PRE_BUTTON, NEXT_BUTTON, PRE_GROUP_BUTTON, NEXT_GROUP_BUTTON];
    var linkRender = function (number, text, isEnable) {
        if (isFunction(config.linkRender)) {
            return config.linkRender(number, text, isEnable);
        }
        var clazz = isEnable ? "" : "disabled";
        return "<a class='" + clazz + "' href='" + config.linkRender + number + "'>" + text + "</a>";
    };


    function hasButton(btnName) {
        var buttons = buttons;
        if (!isArray(buttons)) {
            return false;
        }
        return (buttons.indexOf(btnName) >= 0);
    }

    function pageNowGroup() {// 从1开始的
        return parseInt((pageNumber - 1) / linkSize) + 1;
    }

    function isNowFirstGroup() {
        return pageNowGroup() == 1;
    }

    function isNowLastGroup() {
        return pageNowGroup() == groupSize();
    }

    function groupSize() {// 从1开始
        return parseInt((pageCount - 1) / linkSize) + 1;
    }

    function getGroupBeginNoByNow() {
        return linkSize * (pageNowGroup() - 1) + 1;
    }

    function getGroupEndNoByNow() {
        if (isNowLastGroup()) {
            return pageCount;
        }
        else {
            return getGroupBeginNoByNow() + (linkSize - 1);
        }
    }

    function generateNextGroupLink(begin) {
        return linkRender(begin, "...", true);
    }

    function generatePreGroupLink(end) {
        return linkRender(end, "...", true);
    }

    function generateOneLink(i) {
        if (i == pageNumber) {
            return "<span>" + i + "</span>";
        } else {
            return linkRender(i, i, true);
        }
    }

    function generateLinks(begin, end) {
        var links = [];
        for (var i = begin; i <= end; i++) {
            links.push(generateOneLink(i));
        }
        return links.join("");
    }

    function generateAllLinks() {
        var links = [];

        var begin = getGroupBeginNoByNow();
        var end = getGroupEndNoByNow();
        if (pageCount <= linkSize) {
            links.push(generateLinks(1, pageCount));
        } else {
            if (isNowFirstGroup()) {
                links.push(generateLinks(begin, end));
                links.push(generateNextGroupLink(end + 1));
            } else if (isNowLastGroup()) {
                links.push(generatePreGroupLink(begin - 1));
                links.push(generateLinks(begin, end));
            } else {
                links.push(generatePreGroupLink(begin - 1));
                links.push(generateLinks(begin, end));
                links.push(generateNextGroupLink(end + 1));
            }
        }
        return links.join("");
    }


    function toPaginationHtml() {
        var htmlArray = [];
        htmlArray.push("<div class='cp-pagination'>");

        if (hasButton(HOME_BUTTON)) {
            htmlArray.push(linkRender(1, "首页", true));
            htmlArray.push(generateAllLinks());
            htmlArray.push(linkRender(pageCount, "尾页", true));
        } else {
            htmlArray.push(generateAllLinks());
        }

        htmlArray.push("</div>");
        return htmlArray.join("");
    }


    return toPaginationHtml();
}

//if(window){
//    window.toPagination = toPagination;
//}
//if(exports){
//    exports.toPagination = toPagination;
//}

exports.toPagination = toPagination;