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自定义标签实现分页（转载）

2016-04-26 16:44 253 查看

关于自定义分页标签的使用，我想大家都见过许多人写过，我今天也来凑个热闹写下我见到的自定义标签的使用步骤

既然是自定义标签那么肯定少不了类和tld文件这两大因素，因为这两个才能构成标签

首先奉献上最核心的自定义分页标签类的写法PagerTag.java,前提是要继承自TagSupport类

Java代码

<span style="font-size: medium;">package com.javacrazyer.web.tag;

import java.io.IOException;

import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.jsp.JspException;

import javax.servlet.jsp.tagext.TagSupport;

/**

* 分页标签处理类

*/

public class PagerTag extends TagSupport {

private static final long serialVersionUID = 5729832874890369508L;

private String url; //请求URI

private int pageSize = 10; //每页要显示的记录数

private int pageNo = 1; //当前页号

private int recordCount; //总记录数

@SuppressWarnings("unchecked")

public int doStartTag() throws JspException {

int pageCount = (recordCount + pageSize - 1) / pageSize; //计算总页数

//拼写要输出到页面的HTML文本

StringBuilder sb = new StringBuilder();

sb.append("<style type=\"text/css\">");

sb.append(".pagination {padding: 5px;float:right;font-size:12px;}");

sb.append(".pagination a, .pagination a:link, .pagination a:visited {padding:2px 5px;margin:2px;border:1px solid #aaaadd;text-decoration:none;color:#006699;}");

sb.append(".pagination a:hover, .pagination a:active {border: 1px solid #ff0000;color: #000;text-decoration: none;}");

sb.append(".pagination span.current {padding: 2px 5px;margin: 2px;border: 1px solid #ff0000;font-weight: bold;#ff0000;color: #FFF;}");

sb.append(".pagination span.disabled {padding: 2px 5px;margin: 2px;border: 1px solid #eee; color: #ddd;}");

sb.append("</style>\r\n");

sb.append("<div class=\"pagination\">\r\n");

if(recordCount == 0){

sb.append("<strong>没有可显示的项目</strong>\r\n");

}else{

//页号越界处理

if(pageNo > pageCount){ pageNo = pageCount; }

if(pageNo < 1){ pageNo = 1; }

sb.append("<form method=\"post\" action=\"").append(this.url)

.append("\" name=\"qPagerForm\">\r\n");

//获取请求中的所有参数

HttpServletRequest request = (HttpServletRequest) pageContext

.getRequest();

Enumeration<String> enumeration = request.getParameterNames();

String name = null; //参数名

String value = null; //参数值

//把请求中的所有参数当作隐藏表单域

while (enumeration.hasMoreElements()) {

name = enumeration.nextElement();

value = request.getParameter(name);

// 去除页号

if (name.equals("pageNo")) {

if (null != value && !"".equals(value)) {

pageNo = Integer.parseInt(value);

}

continue;

}

sb.append("<input type=\"hidden\" name=\"")

.append(name)

.append("\" value=\"")

.append(value)

.append("\"/>\r\n");

}

// 把当前页号设置成请求参数

sb.append("<input type=\"hidden\" name=\"").append("pageNo")

.append("\" value=\"").append(pageNo).append("\"/>\r\n");

// 输出统计数据

sb.append(" 共<strong>").append(recordCount)

.append("</strong>项")

.append(",<strong>")

.append(pageCount)

.append("</strong>页: \r\n");

//上一页处理

if (pageNo == 1) {

sb.append("<span class=\"disabled\">« 上一页")

.append("</span>\r\n");

} else {

sb.append("<a href=\"javascript:turnOverPage(")

.append((pageNo - 1))

.append(")\">« 上一页</a>\r\n");

}

//如果前面页数过多,显示"..."

int start = 1;

if(this.pageNo > 4){

start = this.pageNo - 1;

sb.append("<a href=\"javascript:turnOverPage(1)\">1</a>\r\n");

sb.append("<a href=\"javascript:turnOverPage(2)\">2</a>\r\n");

sb.append("…\r\n");

}

//显示当前页附近的页

int end = this.pageNo + 1;

if(end > pageCount){

end = pageCount;

}

for(int i = start; i <= end; i++){

if(pageNo == i){ //当前页号不需要超链接

sb.append("<span class=\"current\">")

.append(i)

.append("</span>\r\n");

}else{

sb.append("<a href=\"javascript:turnOverPage(")

.append(i)

.append(")\">")

.append(i)

.append("</a>\r\n");

}

}

//如果后面页数过多,显示"..."

if(end < pageCount - 2){

sb.append("…\r\n");

}

if(end < pageCount - 1){

sb.append("<a href=\"javascript:turnOverPage(")

.append(pageCount - 1)

.append(")\">")

.append(pageCount - 1)

.append("</a>\r\n");

}

if(end < pageCount){

sb.append("<a href=\"javascript:turnOverPage(")

.append(pageCount)

.append(")\">")

.append(pageCount)

.append("</a>\r\n");

}

//下一页处理

if (pageNo == pageCount) {

sb.append("<span class=\"disabled\">下一页 »")

.append("</span>\r\n");

} else {

sb.append("<a href=\"javascript:turnOverPage(")

.append((pageNo + 1))

.append(")\">下一页 »</a>\r\n");

}

sb.append("</form>\r\n");

// 生成提交表单的JS

sb.append("<script language=\"javascript\">\r\n");

sb.append(" function turnOverPage(no){\r\n");

sb.append(" if(no>").append(pageCount).append("){");

sb.append(" no=").append(pageCount).append(";}\r\n");

sb.append(" if(no<1){no=1;}\r\n");

sb.append(" document.qPagerForm.pageNo.value=no;\r\n");

sb.append(" document.qPagerForm.submit();\r\n");

sb.append(" }\r\n");

sb.append("</script>\r\n");

}

sb.append("</div>\r\n");

//把生成的HTML输出到响应中

try {

pageContext.getOut().println(sb.toString());

} catch (IOException e) {

throw new JspException(e);

}

return SKIP_BODY; //本标签主体为空,所以直接跳过主体

}

public void setUrl(String url) {

this.url = url;

}

public void setPageSize(int pageSize) {

this.pageSize = pageSize;

}

public void setPageNo(int pageNo) {

this.pageNo = pageNo;

}

public void setRecordCount(int recordCount) {

this.recordCount = recordCount;

}

}</span>

WEB-INF/pager.tld的写法

Xml代码

<span style="font-size: medium;"><?xml version="1.0" encoding="UTF-8"?>

<taglib version="2.0" xmlns="http://java.sun.com/xml/ns/j2ee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee web-jsptaglibrary_2_0.xsd">

<tlib-version>0.9</tlib-version>



<short-name>w</short-name>



<uri>http://javacrazyer.iteye.com/tags/pager</uri>



<tag>



<name>pager</name>



<tag-class>com.javacrazyer.web.tag.PagerTag</tag-class>



<body-content>empty</body-content>



<attribute>



<name>pageNo</name>



<required>true</required>



<rtexprvalue>true</rtexprvalue>



<type>int</type>

</attribute>



<attribute>

<name>recordCount</name>

<required>true</required>

<rtexprvalue>true</rtexprvalue>

<type>int</type>

</attribute>



<attribute>

<name>pageSize</name>

<required>true</required>

<rtexprvalue>true</rtexprvalue>

<type>int</type>

</attribute>



<attribute>

<name>url</name>

<required>true</required>

<rtexprvalue>true</rtexprvalue>

<type>java.lang.String</type>

</attribute>

</tag>

</taglib></span>

好了，就上面的两个基本要素就已经构成了完整的分页标签，下面就差在页面的使用方式了

一般的使用步骤为在JSP页面中：

先倒入标签库：<%@taglib uri="http://javacrazyer.iteye.com/tags/pager" prefix="w"%>

然后使用： <w:pager pageSize="${pageSize}" pageNo="${pageNo}" url="do.jsp" recordCount="${pm.recordCount}"/>

具体使用示例，上面两个类保持不变

这个例子可以说非常好的纯servlet项目的例子，大家今后编程如果没有用到任何框架的话，我希望这个例子能给你带来点启示

前提是导入所有需要的jar包：包括common-dbcp.jar(数据源需要用到)，common-dbutils-1.2.jar(数据库CURD操作需要用到，可取代最原始的JDBC操作),junit.jar(测试用到)以及数据库驱动包

关于上面的common-dbutils非常有用，尤其是在非框架项目中，后面我提供下载

首先数据库，这个数据库脚本是我用navicat导出来的

Sql代码

<span style="font-size: medium;">/*

Navicat MySQL Data Transfer

Source Host : localhost:3306

Source Database : jstl

Target Host : localhost:3306

Target Database : jstl

Date: 2010-11-18 14:30:30

*/

SET FOREIGN_KEY_CHECKS=0;

-- ----------------------------

-- Table structure for news

-- ----------------------------

DROP TABLE IF EXISTS `news`;

CREATE TABLE `news` (

`detail` varchar(255) DEFAULT NULL,

`name` varchar(255) DEFAULT NULL,

`id` int(11) NOT NULL AUTO_INCREMENT,

PRIMARY KEY (`id`)

) ENGINE=InnoDB AUTO_INCREMENT=1253 DEFAULT CHARSET=utf8;

</span>

实体类News.java

Java代码

<span style="font-size: medium;">package com.javacrazyer.domain;

public class News {

private int id;

private String name;

private String detail;

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getDetail() {

return detail;

}

public void setDetail(String detail) {

this.detail = detail;

}

@Override

public String toString() {

return "News [detail=" + detail + ", id=" + id + ", name=" + name + "]";

}

}</span>

NewsDao.java

Java代码

<span style="font-size: medium;">package com.javacrazyer.dao;

import com.javacrazyer.common.PageModel;

import com.javacrazyer.domain.News;

public interface NewsDao {

PageModel<News> findByPager(int pageNo, int pageSize);

void createNews(News news);

void update(News news);

void delete(int id);

News findbyId(int id);

int findTotalSize();

}</span>

NewsImplDao.java

Java代码

<span style="font-size: medium;">package com.javacrazyer.daoimpl;

import java.sql.Connection;

import java.sql.SQLException;

import java.util.List;

import org.apache.commons.dbutils.DbUtils;

import org.apache.commons.dbutils.QueryRunner;

import org.apache.commons.dbutils.handlers.BeanHandler;

import org.apache.commons.dbutils.handlers.BeanListHandler;

import org.apache.commons.dbutils.handlers.ScalarHandler;

import com.javacrazyer.common.ConnectionFactory;

import com.javacrazyer.common.DAOException;

import com.javacrazyer.common.PageModel;

import com.javacrazyer.dao.NewsDao;

import com.javacrazyer.domain.News;

public class NewsDaoImpl implements NewsDao {

private QueryRunner qr = new QueryRunner();

public void createNews(News news) {

Connection conn = null;

String sql = "insert into news(name,detail) "

+ " values(?,?)";

Object[] param = { news.getName(),news.getDetail() };

try {

conn = ConnectionFactory.getConn();

qr.update(conn, sql, param);

} catch (SQLException e) {

e.printStackTrace();

throw new DAOException("新增新闻信息时出现异常", e);

} finally {

DbUtils.closeQuietly(conn);

}

}

public PageModel<News> findByPager(int pageNo, int pageSize) {

PageModel<News> pm=new PageModel<News>();

Connection conn=null;

String sql="select *from news limit ?,?";

Object[] param={(pageNo-1)*pageSize,pageSize};

List<News> cates=null;

int count;

try {

conn=ConnectionFactory.getConn();

cates=(List<News>)qr.query(conn, sql, new BeanListHandler(News.class), param);

pm.setDatas(cates);

pm.setRecordCount(findTotalSize());

} catch (SQLException e) {

e.printStackTrace();

throw new DAOException("分页查询出错",e);

}finally{

DbUtils.closeQuietly(conn);

}

return pm;

}

public void delete(int id) {

Connection conn = null;

String sql = "delete from news where id=?";

Object[] param = { id };

try {

conn = ConnectionFactory.getConn();

qr.update(conn, sql, param);

} catch (SQLException e) {

e.printStackTrace();

throw new DAOException("删除新闻信息时出现异常", e);

} finally {

DbUtils.closeQuietly(conn);

}

}

public News findbyId(int id) {

News news=null;

Connection conn=null;

String sql="select * from news where id=?";

Object[] param={id};

try {

conn=ConnectionFactory.getConn();

news=(News)qr.query(conn,sql, new BeanHandler(News.class), param);

} catch (SQLException e) {

e.printStackTrace();

throw new DAOException("根据ID查询新闻信息时出现异常",e);

}finally{

DbUtils.closeQuietly(conn);

}

return news;

}

public void update(News news) {

Connection conn=null;

String sql="update news set name=?,detail=? where id=?";

Object[] param={news.getName(),news.getDetail(),news.getId()};

try {

conn=ConnectionFactory.getConn();

qr.update(conn, sql, param);

} catch (SQLException e) {

e.printStackTrace();

throw new DAOException("更新新闻信息出错",e);

}finally{

DbUtils.closeQuietly(conn);

}

}

public int findTotalSize() {

Connection conn=null;

String sql="select count(id) from news";

int count=0;

try {

conn=ConnectionFactory.getConn();

count=((Long)qr.query(conn,sql,new ScalarHandler())).intValue();

} catch (SQLException e) {

e.printStackTrace();

throw new DAOException("查询记录总数出错",e);

}finally{

DbUtils.closeQuietly(conn);

}

return count;

}

}</span>

PageModel.java

Java代码

<span style="font-size: medium;">package com.javacrazyer.common;

import java.util.List;

/**

* 分页组件(包含当前页结果数据列表和总记录数)

* 注意，它不是持久化实体类

*

*/

public class PageModel<T> {

private int recordCount;

private List<T> datas;

public int getRecordCount() {

return recordCount;

}

public void setRecordCount(int recordCount) {

this.recordCount = recordCount;

}

public List<T> getDatas() {

return datas;

}

public void setDatas(List<T> datas) {

this.datas = datas;

}

} </span>

数据库连接工具类

Java代码

<span style="font-size: medium;">package com.javacrazyer.common;

import java.io.IOException;

import java.sql.Connection;

import java.sql.SQLException;

import java.util.Properties;

import javax.sql.DataSource;

import org.apache.commons.dbcp.BasicDataSource;

/**

*

* 数据库连接工厂类

*

*/

public class ConnectionFactory {

private static DataSource dss=null;

static{

Properties pr=new Properties();

try {

pr.load(Thread.currentThread().getContextClassLoader().getResourceAsStream("config.properties"));

} catch (IOException e) {

e.printStackTrace();

}

BasicDataSource ds=new BasicDataSource();

ds.setDriverClassName(pr.getProperty("driver_name"));

ds.setUrl(pr.getProperty("url"));

ds.setUsername(pr.getProperty("username"));

ds.setPassword(pr.getProperty("password"));

dss=ds;

}

private ConnectionFactory(){}

public static Connection getConn() throws SQLException{

return dss.getConnection();

}

}</span>

上面代码用到的config.properties

Xml代码

<span style="font-size: medium;">#mysql

driver_name=com.mysql.jdbc.Driver

url=jdbc:mysql:///jstl

username=root

password=root</span>

DAO实例工具类，类似于Spring的BeanFactory

Java代码

<span style="font-size: medium;">package com.javacrazyer.common;

import java.io.IOException;

import java.util.Properties;

/**

*

*

* 自定义简单工厂

*/

public class DAOFactory {

public static Properties pr = new Properties();

static {

try {

pr.load(Thread.currentThread().getContextClassLoader()

.getResourceAsStream("daoname.properties"));

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

public static Object newInstance(String name){

Object obj=null;

String daoImplName = pr.getProperty(name);

if(null!=daoImplName){

try {

obj=Class.forName(daoImplName).newInstance();

} catch (InstantiationException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IllegalAccessException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (ClassNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}else{

throw new RuntimeException("指定名称的DAO类未找到");

}

return obj;

}

}</span>

上面代码用到的配置daoname.properties

Xml代码

<span style="font-size: medium;">newsdao=com.javacrazyer.daoimpl.NewsDaoImpl

coursedao=com.javacrazyer.web.tag.CourseDAOImpl

teacherdao=com.javacrazyer.web.tag.TeacherDAOImpl

catedao=com.javacrazyer.web.tag.CategoryDAOImpl

gradao=com.javacrazyer.web.tag.GraduateDAOImpl

accountdao=com.javacrazyer.web.tag.AccountDAOImpl</span>

平时开发中常用到的常量存放类

Java代码

<span style="font-size: medium;">package com.javacrazyer.common;

import java.util.LinkedHashMap;

import java.util.Map;

/**

* 系统常量类

*

* @author tjitcast.com

*/

public class Constant {

/** 状态：可用 */

public static final int STATUS_ACTIVE = 1;

/** 状态：不可用 */

public static final int STATUS_INACTIVE = 0;

/** 课程类型：全日制 */

public static final int COURSE_FULL_TIME = 1;

/** 课程类型：业务 */

public static final int COURSE_SPARE_TIME = 2;

/** 课程类型：免费 */

public static final int COURSE_FREE_TIME = 3;

/** 账号类型：超级管理员 */

public static final int ACCOUNT_SUPER = 100;

/** 账号类型：普通管理员 */

public static final int ACCOUNT_COMMON = 50;

/** 账号状态：激活 */

public static final int ACCOUNT_STATUS_ACTIVE = 1;

/** 账号状态：未激活 */

public static final int ACCOUNT_STATUS_INACTIVE = 0;

/** 账号状态：锁定 */

public static final int ACCOUNT_STATUS_LOCK = -1;

/** 每页要显示的记录数：10 */

public static final int PAGE_SIZE =10;

private static Map<Integer, String> statusMap = new LinkedHashMap<Integer, String>();

static {

// 对状态Map进行初始化

statusMap.put(Integer.valueOf(STATUS_ACTIVE), "可用");

statusMap.put(Integer.valueOf(STATUS_INACTIVE), "不可用");

}

public static Map<Integer, String> getStatusMap() {

return statusMap;

}

}</span>

开发中常用到的用来判断空值，类型转换，集合操作等等的自定义常用工具类

Java代码

<span style="font-size: medium;">/**

* ClassName: DataValidateUtil.java

* created on Jul 10, 2009

* Copyrights 2009 www.tjicast.com All rights reserved.

* site: http://www.tjitcast.com
* email: tjhr@csdn.net

* phone: 022-83726777,89721888

*/

package com.javacrazyer.common;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Collection;

import java.util.Date;

import java.util.Map;

/**

* 对一些常用数据进行操作的工具类

*

*/

public class DataOptUtil {

/** 日期长格式 */

public static final String DATE_PATTERN_LONG = "yyyy-MM-dd HH:mm:ss";

/** 日期格式 */

public static final String DATE_PATTERN = "yyyy-MM-dd";

public static boolean isNotNull(String str){

if(null != str && !"".equals(str)){

return true;

}else{

return false;

}

}

public static int parseInt(String str){

if(isNotNull(str)){

return Integer.parseInt(str);

}else{

throw new RuntimeException("字符串为空，不能转换成数字");

}

}

public static Date parseDate(String str, String pattern){

SimpleDateFormat sdf = new SimpleDateFormat(pattern);

Date date = null;

if(isNotNull(str)){

try {

date = sdf.parse(str);

} catch (ParseException e) {

e.printStackTrace();

}

}else{

throw new RuntimeException("字符串为空，不能转换成日期");

}

return date;

}

public static Date parseDate(String str){

return parseDate(str, DataOptUtil.DATE_PATTERN);

}

public static Date parseLongDate(String str){

return parseDate(str, DataOptUtil.DATE_PATTERN_LONG);

}

public static String date2String(Date date, String pattern){

SimpleDateFormat sdf = new SimpleDateFormat(pattern);

return sdf.format(date);

}

public static String Date2String(Date date){

return date2String(date, DataOptUtil.DATE_PATTERN);

}

public static String Date2LongString(Date date){

return date2String(date, DataOptUtil.DATE_PATTERN_LONG);

}

public static int getSize(Collection<?> coll){

int size = coll == null ? 0 : coll.size();

return size;

}

public static int getSize(Map<?,?> map){

int size = map == null ? 0 : map.size();

return size;

}

public static int getLength(Object[] obj){

int length = 0;

length = obj == null ? 0 : obj.length;

return length;

}

}</span>

还有一个自定义非受检异常类

Java代码

<span style="font-size: medium;">package com.javacrazyer.common;

/**

*

* 自定义的非受检异常

*

*/

public class DAOException extends RuntimeException {

private static final long serialVersionUID = 1047748781772098415L;

public DAOException() {

super();

}

public DAOException(String message, Throwable cause) {

super(message, cause);

}

public DAOException(String message) {

super(message);

}

public DAOException(Throwable cause) {

super(cause);

}

}

</span>

页面方面

index.html

Java代码

<span style="font-size: medium;"><html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />

<meta http-equiv="refresh" content="0; url=do.jsp" />

</head>

</html></span>

do.jsp

Java代码

<span style="font-size: medium;"><%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%@page import="com.javacrazyer.common.DAOFactory"%>

<%@page import="com.javacrazyer.dao.NewsDao"%>

<%@page import="com.javacrazyer.common.PageModel"%>

<%@page import="com.javacrazyer.common.DataOptUtil"%>

<%@page import="com.javacrazyer.common.Constant"%>

<%@page import="com.javacrazyer.domain.News"%>

<%

NewsDao dao=(NewsDao)DAOFactory.newInstance("newsdao");

int pageNo = 1;

String temp = request.getParameter("pageNo");

if (DataOptUtil.isNotNull(temp)) {

pageNo = Integer.parseInt(temp);

}

int categoryid = 1;

String temp1 = request.getParameter("category_id");

if (DataOptUtil.isNotNull(temp1)) {

categoryid = Integer.parseInt(temp1);

}

PageModel<News> pm=dao.findByPager(pageNo,Constant.PAGE_SIZE);

request.setAttribute("pm",pm);

request.setAttribute("pageNo", Integer.valueOf(pageNo));

request.setAttribute("pageSize", Constant.PAGE_SIZE);

request.getRequestDispatcher("/index.jsp").forward(request,response);

%></span>

index.jsp

Java代码

<span style="font-size: medium;"><%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%@taglib uri="http://javacrazyer.iteye.com/tags/pager" prefix="w"%>

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

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">

<meta http-equiv="cache-control" content="no-cache">

<meta http-equiv="expires" content="0">

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

<meta http-equiv="description" content="This is my page">



</head>

<body>

<h3>新闻列表</h3><hr/>

<table>

<tr><td>新闻编号</td><td>新闻标题</td><td>新闻内容</td></tr>

<c:forEach items="${pm.datas}" var="news">

<tr><td>${news.id}</td><td>${news.name }</td><td>${news.detail}</td></tr>

</c:forEach>

</table>

<w:pager pageSize="${pageSize}" pageNo="${pageNo}" url="do.jsp" recordCount="${pm.recordCount}"/>

</body>

</html></span>

实际运行出来的效果

虽然自定义标签使用成功了，但总不可能每次开发项目都写下这个类和加上TLD文件吧，比较简洁的方式就是将编译类编译好的class文件和tld一起打成jar包，以后直接导入到项目lib中就可以使用了

具体步骤：将整个目录com/javacrazyer/web/tag/PagerTag.class放到一个目录中去，同时将META-INF拷贝到与com目录相同的目录下，最后将WEB-INF下的pager.tld拷贝到MET-INF下

META-INF中的文件

最后将com文件夹与META-INF文件选中右键添加到压缩文件，选中ZIP压缩格式

改名为jar后缀后确定，这样在同一目录就会多出一个jar来了

以后只要在需要的地方导入该分页JAR包，并且在网页上

<%@taglib uri="http://javacrazyer.iteye.com/tags/pager" prefix="w"%>

<w:pager pageSize="${pageSize}" pageNo="${pageNo}" url="do.jsp"

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