java自定义分页标签

package com.yzr.utils;

import java.io.IOException;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.SimpleTagSupport;

/**
 * 分页标签
 * 
 * @author 伊昭荣
 * @Time 2013年6月2日 22:45:58
 */
public class PageTag extends SimpleTagSupport {
	/**
	 * 总记录数，默认为0
	 */
	private Integer count = 0;
	/**
	 * 总页数
	 */
	private Integer pageCount;
	/**
	 * 当前页,默认设置为1
	 */
	private Integer page = 1;
	/**
	 * 每页显示的条数，默认显示10条
	 */
	private Integer rows = 10;
	/**
	 * 页面链接
	 */
	private String url;
	/**
	 * 页面参数名称，默认为page
	 */
	private String params = "page";

	/**
	 * 显示给前台的东西
	 */
	@Override
	public void doTag() throws JspException, IOException {
		JspWriter out = getJspContext().getOut();
		StringBuffer pageList = new StringBuffer();
		pageCount = (pageCount == null || pageCount < 1) ? 0 : pageCount;
		/**
		 * 计算当前总页数
		 */
		pageCount = count % rows > 0 ? count / rows + 1 : count / rows;
		page = (page == null || page < 1 || page > pageCount) ? 1 : page;
		pageList.append("<div class=\"pagination\">");
		/**
		 * 当总页数大于1
		 */
		if (pageCount > 1) {
			pageList.append("<div class=\"pagination-pages\">");
			pageList.append("<div class=\"pagination-page\">");
			/**
			 * 显示上一页
			 */
			if (page > 1) {
				pageList.append("<a class=\"page-prev\" ");
				pageList.append("href=\"" + url + "?");
				pageList.append("" + params + "=" + (page - 1) + "\"");
				pageList.append("title=\"上一页\">");
				pageList.append("<span>上一页</span></a>");
			}
			/**
			 * 总页数小于10，全部显示
			 */
			if (pageCount <= 10) {
				for (int i = 1; i <= pageCount; i++) {
					/**
					 * 不是当前页
					 */
					if (i != page) {
						pageList.append("<a class=\"page\" title=\"第" + i + "页\"");
						pageList.append("href=\"" + url + "?");
						pageList.append("" + params + "=" + i + "\">" + i + "</a>");
					} else {
						/**
						 * 是当前页
						 */
						pageList.append("<span class=\"page-cur\">" + i + "</span>");
					}
				}
			} else {
				/**
				 * 总页数大于10，分情况显示
				 */
				int i = page - 3 <= 2 ? 1 : page - 3;
				int end = page + 3 > pageCount ? pageCount : page + 3;
				/**
				 * 当前页加上3页不到7页时显示7页
				 */
				end = end > 7 ? end : 7;
				i = end == pageCount ? pageCount - 7 : i;
				/**
				 * 显示第1、2页
				 */
				if (i > 2) {
					for (int j = 1; j < 3; j++) {
						pageList.append("<a class=\"page\" title=\"第" + j + "页\"");
						pageList.append("href=\"" + url + "?");
						pageList.append("" + params + "=" + j + "\">" + j + "</a>");
					}
					if (page - 3 > 3)
						pageList.append("<span class=\"page-split\">...</span>");
				}
				for (; i <= end; i++) {
					/**
					 * 不是当前页
					 */
					if (i != page) {
						pageList.append("<a class=\"page\" title=\"第" + i + "页\"");
						pageList.append("href=\"" + url + "?");
						pageList.append("" + params + "=" + i + "\">" + i + "</a>");
					} else {
						/**
						 * 是当前页
						 */
						pageList.append("<span class=\"page-cur\">" + i + "</span>");
					}
				}
				if (end < pageCount) {
					if (end + 1 < pageCount)
						pageList.append("<span class=\"page-split\">...</span>");
					pageList.append("<a class=\"page\" title=\"第" + pageCount + "页\"");
					pageList.append("href=\"" + url + "?");
					pageList.append("" + params + "=" + pageCount + "\">" + pageCount + "</a>");
				}
			}
			/**
			 * 当总页数大于1，当前页小于总页数时，下一页可点
			 */
			if (page < pageCount) {
				pageList.append("<a class=\"page-next\"");
				pageList.append("href=\"" + url + "?");
				pageList.append("" + params + "=" + (page + 1) + "\"");
				pageList.append("title=\"下一页\">");
				pageList.append("<span>下一页</span>");
				pageList.append("</a>");
			}
			pageList.append("</div>");

			/**
			 * 显示总页数
			 */
			pageList.append("<div class=\"pagination-count\">");
			pageList.append("<span>共</span>");
			pageList.append("<span class=\"b\">" + pageCount != null ? pageCount : 0 + "</span>");
			pageList.append("<span>页</span>");
			pageList.append("</div>");

			/**
			 * 进行页面跳转
			 */
			int nextPage = page + 1 > pageCount ? pageCount : page + 1;
			pageList.append("<div class=\"pagination-form\"><span>向第</span>");
			pageList.append("<input type=\"text\" name=\"page\" value=\"" + nextPage + "\" class=\"page-num\">");
			pageList.append("<span>页</span><a href=\"javascript:getPage('" + url + "')\" class=\"btn\">跳转</a></div>");
		} else {
			pageList.append("<div class=\"pagination-noData\">没有相关数据</div>");
		}
		pageList.append("</div>");
		out.write(pageList.toString());
	}

	public Integer getCount() {
		return count;
	}

	public void setCount(Integer count) {
		this.count = count;
	}

	public Integer getPageCount() {
		return pageCount;
	}

	public void setPageCount(Integer pageCount) {
		this.pageCount = pageCount;
	}

	public Integer getPage() {
		return page;
	}

	public void setPage(Integer page) {
		this.page = page;
	}

	public Integer getRows() {
		return rows;
	}

	public void setRows(Integer rows) {
		this.rows = rows;
	}

	public String getUrl() {
		return url;
	}

	public void setUrl(String url) {
		this.url = url;
	}

	public String getParams() {
		return params;
	}

	public void setParams(String params) {
		this.params = params;
	}
}

 page.tld文件

<?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>1.0</tlib-version>
	<short-name>p</short-name>
	<uri>/WEB-INF/tlds/page</uri>
	<tag>
		<name>page</name>
		<tag-class>com.yzr.utils.PageTag</tag-class>
		<body-content>empty</body-content>
		<attribute>
			<name>url</name>
			<required>true</required>
			<rtexprvalue>true</rtexprvalue>
			<type>java.lang.String</type>
		</attribute>
		<attribute>
			<name>count</name>
			<required>false</required>
			<rtexprvalue>true</rtexprvalue>
			<type>int</type>
		</attribute>
		<attribute>
			<name>pageCount</name>
			<required>false</required>
			<rtexprvalue>true</rtexprvalue>
			<type>int</type>
		</attribute>
		<attribute>
			<name>page</name>
			<required>false</required>
			<rtexprvalue>true</rtexprvalue>
			<type>int</type>
		</attribute>
		<attribute>
			<name>rows</name>
			<required>false</required>
			<rtexprvalue>true</rtexprvalue>
			<type>int</type>
		</attribute>
		<attribute>
			<name>params</name>
			<rtexprvalue>false</rtexprvalue>
			<type>java.lang.String</type>
		</attribute>
	</tag>
</taglib>

 

package com.yzr.servlet;

import java.io.*;
import javax.servlet.*;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;

@WebServlet(name = "PagesServlet", urlPatterns = { "/PagesServlet.go" })
public class PagesServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String curr = request.getParameter("page");
		if (curr == null) {
			curr = "1";
		}
		request.setAttribute("page", curr);
		RequestDispatcher rd = request.getRequestDispatcher("page.jsp");
		rd.forward(request, response);
	}

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		processRequest(request, response);
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		processRequest(request, response);
	}

	public String getServletInfo() {
		return "Short description";
	}
}

 

page.jsp文件

<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@taglib prefix="p" uri="/WEB-INF/tlds/page.tld"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
<link rel="stylesheet" type="text/css" href="css/page.css">
<script type="text/javascript" src="js/jquery-1.8.2.min.js"></script>
<script type="text/javascript" src="js/page.js"></script>
</head>
<body>
	<h1>JSP Page</h1>
	<p:page url="PagesServlet.go" page="${page}" count="1001" />
	<p>&nbsp;</p>
</body>
</html>