自定义分页标签

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JSP页面：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%-- 引入标签库 --%>
<%@ taglib uri="http://blog.csdn.net/qjyong/tags/pager" prefix="q"%>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>自定义分页标签使用示例</title>
<style type="text/css">
body {
margin-top: 20px;
text-align: left;
font-family: 宋体, Arial, Verdana;
font-size: 13px;
line-height: 150%;
min-width:800px;
word-break:break-all;
}
/* 分页标签样式 */
.pagination {
padding: 5px;
float: right;
}
.pagination a, .pagination a:link, .pagination a:visited {
padding: 2px 5px 2px 5px;
margin: 2px;
border: 1px solid #aaaadd;
text-decoration: none;
color: #006699;
}
.pagination a:hover, .pagination a:active {
border: 1px solid #ff0000;
color: #000;
text-decoration: none;
}
.pagination span.current {
padding: 2px 5px 2px 5px;
margin: 2px;
border: 1px solid #ff0000;
font-weight: bold;
background-color: #ff0000;
color: #FFF;
}
.pagination span.disabled {
padding: 2px 5px 2px 5px;
margin: 2px;
border: 1px solid #eee;
color: #ddd;
}
</style>
</head>

<body>
<div style="margin: 0px auto; width:700px">
<div id="title">
<h3>自定义数据分页标签的使用示例</h3><hr/>
</div>
<div id="data">
<table border="1" width="600px" align="center">
<% //获取分页后的数据进行显示
List<String> datas = (List<String>)request.getAttribute("datas");
for(String str : datas){
out.println("<tr><td>" + str + "</td></tr>");
} %>
</table>
</div>
<%-- 分页标签的使用
<q:pager pageNo='<%= ((Integer)request.getAttribute("pageNo")).intValue()%>'
pageSize='<%= ((Integer)request.getAttribute("pageSize")).intValue()%>'
recordCount='<%= ((Integer)request.getAttribute("recordCount")).intValue()%>'
url="TestPagerTagServlet" />
--%>
<%-- 使用EL表达式简化分页标签的使用--%>
<q:pager pageNo="${pageNo}"
pageSize="${pageSize}"
recordCount="${recordCount}"
url="TestPagerTagServlet" />

</div>
</body>
</html>

JAVA类：

1、

package com.qiujy.web.Servlet;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* 测试分页标签使用的Servlet
* @author qiujy
*/
public class TestPagerTagServlet extends HttpServlet {

private static final long serialVersionUID = -3305996070755176492L;

private List<String> datas;
public static final int PAGER_PAGESIZE = 10;

public void init() throws ServletException {
datas = new ArrayList<String>();
for(int i = 1; i <= 123; i++){
datas.add("字符串" + i);
}
}

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doPost(request, response);
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");

int recordCount = this.datas.size(); //获取总记录数

//获取当前页号
int pageNo = 1;
String pageNoStr = request.getParameter("pageNo");
if(null != pageNoStr && !pageNoStr.equals("")){
pageNo = Integer.parseInt(pageNoStr);
}

//获取分页数据
int start = (pageNo - 1) * PAGER_PAGESIZE;
int end = start + PAGER_PAGESIZE;
if(end > this.datas.size()){
end = this.datas.size();
}
List<String> results = this.datas.subList(start, end);

//把分页数据和分页标签所需要的参数存放到request中
request.setAttribute("datas", results);
request.setAttribute("pageNo", pageNo);
request.setAttribute("pageSize", PAGER_PAGESIZE);
request.setAttribute("recordCount", recordCount);

//转发请求到JSP页面
request.getRequestDispatcher("/pager.jsp").forward(request, response);
}
}

2、

/**
* ClassName: PagerTag.java
* created on 2009-03-20
* Copyrights 2009 qjyong All rights reserved.
* EMail: qjyong@gmail.com
*/
package com.qiujy.web.tags;

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("\r\n<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("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:void(null)\"")
.append(" onclick=\"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:void(null)\"")
.append(" onclick=\"turnOverPage(1)\">1</a>\r\n");
sb.append("<a href=\"javascript:void(null)\"")
.append(" onclick=\"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:void(null)\"")
.append(" onclick=\"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:void(null)\"")
.append(" onclick=\"turnOverPage(")
.append(pageCount - 1)
.append(")\">")
.append(pageCount - 1)
.append("</a>\r\n");
}
if(end < pageCount){
sb.append("<a href=\"javascript:void(null)\"")
.append(" onclick=\"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:void(null)\"")
.append(" onclick=\"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(" var qForm=document.qPagerForm;\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(" qForm.pageNo.value=no;\r\n");
sb.append(" qForm.action=\"").append(url).append("\";\r\n");
sb.append(" qForm.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;
}
}

3、

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* 测试分页标签使用的Servlet
* @author qiujy
*/
public class TestPagerTagServlet extends HttpServlet {

private static final long serialVersionUID = -3305996070755176492L;

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doPost(request, response);
}

//获取当前页号
int pageNo = 1;
String pageNoStr = request.getParameter("pageNo");
if(null != pageNoStr && !pageNoStr.equals("")){
pageNo = Integer.parseInt(pageNoStr);
}

4、

import java.io.IOException;
import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;

TLD：<?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>q</short-name>
<uri>http://blog.csdn.net/qjyong/tags/pager</uri>


<tag>

<name>pager</name>

<tag-class>com.qiujy.web.tags.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>