jsp自定义分页标签

1、web工程的整体结构

2、Eclipse中tld文件的构建方法
3、编码

package mytags;import java.io.IOException;import javax.servlet.jsp.JspException;import javax.servlet.jsp.tagext.TagSupport;public class PagerTag extends TagSupport {/** *  */private static final long serialVersionUID = -3066943125964706748L;private String url; //表单提交地址private int recordCount;//记录总数private int pageNo;//当前页码private int pageSize;//页面容量//标签体的主体方法@Overridepublic int doStartTag() throws JspException {// TODO Auto-generated method stub//总页数int pageCount=(recordCount+pageSize-1)/pageSize;if(pageNo>pageCount){pageNo=pageCount;}if(pageNo<0){pageNo=1;}//提交到标签体的表单及脚本内容StringBuffer sb=new StringBuffer();sb.append("<div class=\"pagination\">");//当action=“”时，表示不刷新页面，只更新表单内容sb.append("<form action=\"\" method=\"post\" name=\"qPagerForm\">\r\n");//传递当前页码的隐式参数sb.append("<input type=\"hidden\" name=\"pageNo\" value=").append(pageNo).append(">");//是否显示“上一页”链接if(pageNo>1){sb.append("<a href=\"javascript:void(null)\" onclick=\"turnOverPage("+ (pageNo-1) + ")\">");sb.append("pre");sb.append("</a>");}//是否显示当前页前面的"..."，以及其它前面的显示逻辑int start=1;if(pageNo>4){start=pageNo-1;sb.append("<a href=\"javascript:void(null)\" onclick=\"turnOverPage(1)\">");sb.append("1");sb.append("</a>");sb.append("<a href=\"javascript:void(null)\" onclick=\"turnOverPage(2)\">");sb.append("2");sb.append("</a>");sb.append("…");}int end=pageNo+1;if(end>pageCount){end=pageCount;}for(int i=start;i<=end;i++){if(i==pageNo){sb.append("<span class=\"current\">")  .append(pageNo)  .append("</span>");}else{sb.append("<a href=\"javascript:void(null)\" onclick=\"turnOverPage(").append(i).append(")\">").append(i).append("</a>");}}//当前页面后面的显示逻辑if(end<pageCount-2){sb.append("…");}if(end<pageCount-1){sb.append("<a href=\"javascript:void(null)\" onclick=\"turnOverPage(").append(pageCount-1).append(")\">").append(pageCount-1).append("</a>");}if(end<pageCount){sb.append("<a href=\"javascript:void(null)\" onclick=\"turnOverPage(").append(pageCount).append(")\">").append(pageCount).append("</a>");//显示”下一页“链接2sb.append("<a href=\"javascript:void(null)\" onclick=\"turnOverPage(").append(pageNo+1).append(")\">").append("next").append("</a>");}sb.append("</form></div>");//翻页脚本函数，主要作用：//（1）向TestPagerServlet提交跳转页码，更新条目内容的显示//（2）更新翻页标签的显示//脚本函数是隐式的，不会显示sb.append("<script language=\"javascript\">\r\n");sb.append("function turnOverPage(no){\r\n");//脚本与表单属于同一文档，下面是获取表单的方法sb.append("var qForm=document.qPagerForm;\r\n");sb.append("if(no>").append(pageCount).append("){no=").append(pageCount).append(";}\r\n");sb.append("if(no<1){no=1;}\r\n");sb.append("qForm.pageNo.value=no;\r\n").append("qForm.action=\"").append(url).append("\";");sb.append("qForm.submit();").append("\r\n}");sb.append("</script>");try {pageContext.getOut().println(sb.toString());} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}return SKIP_BODY;}public void setRecordCount(int num){recordCount=num;}public void setPageNo(int num){pageNo=num;}public void setPageSize(int num){pageSize=num;}public void setUrl(String str){url=str;}}

import java.io.IOException;import java.util.ArrayList;import java.util.List;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * Servlet implementation class TestPagerTagServlet */@WebServlet("/TestPagerTagServlet")public class TestPagerTagServlet extends HttpServlet {private static final long serialVersionUID = 1L;    private static final int PAGE_SIZE=10;    private List<String> datas;    /**     * @see HttpServlet#HttpServlet()     */    public TestPagerTagServlet() {        super();        // TODO Auto-generated constructor stub    }/** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubdoPost(request, response);}/** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubint pageSize= PAGE_SIZE;request.setAttribute("pageSize", pageSize);int recordCount=datas.size();//获取当前页码String no=request.getParameter("pageNo");int pageNo=1;if(!"".equals(no) && no!=null){pageNo=Integer.parseInt(no);}request.setAttribute("recordCount",recordCount);request.setAttribute("pageNo", pageNo);int s=(pageNo-1)*pageSize;int e=s+pageSize;if(e>recordCount){e=recordCount;}List<String> subdatas=datas.subList(s, e);request.setAttribute("subdatas", subdatas);request.getRequestDispatcher("pager.jsp").forward(request, response);}@Overridepublic void init() throws ServletException {// TODO Auto-generated method stub//super.init();//生成测试用的数据datas  = new ArrayList<String>();for(int i=1;i<105;i++){String str;str="String"+i;datas.add(str);}}}

pager.tdl

<pre name="code" class="html"><?xml version="1.0" encoding="UTF-8"?><taglib>  <tlib-version>0.0</tlib-version>  <jsp-version>0.0</jsp-version>  <short-name>q</short-name>  <!--统一资源定位符，唯一即可-->  <uri>http://www.csdn.net/cjc/tags/pagertag</uri>    <!-- 自定义标签的描述信息 --><tag><!-- 标签名 --><name>pager</name><!-- 对应的标签处理类全限定名 --><tag-class>mytags.PagerTag</tag-class><!-- 标签主体的类型 --><body-content>empty</body-content><!-- 当前页号属性的描述信息 --><attribute><!-- 属性名 --><name>pageNo</name><!-- 该属性是否为必要的 --><required>true</required><!-- 属性值是否可以在JSP运行时期动态产生 --><rtexprvalue>true</rtexprvalue><!-- 属性的数据类型 --><type>int</type></attribute><!-- 总记录数属性的描述信息 --><attribute><name>recordCount</name><required>true</required><rtexprvalue>true</rtexprvalue><type>int</type></attribute><!-- 总页数属性的描述信息 --><attribute><name>pageSize</name><required>true</required><rtexprvalue>true</rtexprvalue><type>int</type></attribute><!-- 分页标签要跳转的URI属性的描述信息 --><attribute><name>url</name><required>true</required><rtexprvalue>true</rtexprvalue><type>java.lang.String</type></attribute></tag></taglib>

pager.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"    pageEncoding="ISO-8859-1" import ="java.util.*"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><%@ taglib uri="http://www.csdn.net/cjc/tags/pagertag" prefix="q" %><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>My Define Pager</title><style type="text/css">.pagination{padding:5px; float:right;}.pagination a, .pagination a:link, .pagination a:visted{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;}</style></head><body><table cellspacing="1" cellpadding="5" border="1" width="500" align="center"><% out.println("<hr/>");List<String> datas = (List<String>)request.getAttribute("subdatas");for(int i=0;i<datas.size();i++){out.println("<tr><td>");out.println(datas.get(i));out.println("</td></tr>");}%></table><!--EL表达式 --><q:pager pageNo="${pageNo}" pageSize="${pageSize}" recordCount="${recordCount}" url="TestPagerTagServlet" /></body></html>

index.html

<!DOCTYPE html><html><head><meta charset="UTF-8"><title>Insert title here</title></head><body><a href="TestPagerTagServlet">Test it now</a></body></html>

4、结果