自定义分页标签最新修改版

标签处理类：/*** ClassName: PagerTag.java* created on Oct 21, 2008* Copyrights 2008 qjyong All rights reserved.* EMail: qjyong@*/package com.qiujy.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;/*** 自定义分页标签* 使用方式<my:pager pageSize="10"* pageNo="1"* recordCount="100"* url="index.jsp" />** @author qiujy**/public class PagerTag extends TagSupport { private int pageSize = 10; // 每页要显示的记录数private int pageNo = 1; // 页号private int recordCount; // 总记录数private String url; // 目的地URLpublic void setPageSize(int pageSize) {this.pageSize = pageSize;}public void setPageNo(int pageNo) {this.pageNo = pageNo;}public void setRecordCount(int recordCount) {this.recordCount = recordCount;}public void setUrl(String url) {this.url = url;}// 主要的逻辑@Overridepublic int doStartTag() throws JspException {if(recordCount == 0){return super.doStartTag();}// 总页数int pageCount = (recordCount + pageSize - 1) / pageSize;// 页号越界处理if (pageNo > pageCount) {pageNo = pageCount;}if (pageNo < 1) {pageNo = 1;}StringBuilder sb = new StringBuilder();sb.append("<form name='pageController' id='pageController' action='' method='post'>\r\n") .append("<input type='hidden' id='pageNo' name='pageNo' value='" + pageNo + "' />\r\n");//------------------------------------ 获取所有請求中的参数HttpServletRequest request = (HttpServletRequest) pageContext.getRequest();Enumeration<String> enumeration = request.getParameterNames();String name = null;String value = null;//把请求中的所有参数当作隐藏表单域在页面中写出)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);}}sb.append("<input type='hidden' name='").append(name).append("' value='").append(value).append("'/>\r\n");}//----------------------------------------------------sb.append(" 总共有" + pageCount + "页,").append("当前是第" + pageNo + "页\r\n");if (pageNo == 1) {sb.append("首页");sb.append(" ");sb.append("上一页\r\n");} else {sb.append("<a href='#' onclick='turnOverPage(1)'>首页</a>\r\n"); sb.append(" ");sb.append("<a href='#' onclick='turnOverPage(").append((pageNo - 1)).append(")'>上一页</a>\r\n");}sb.append(" ");if (pageNo == pageCount) {sb.append("下一页");sb.append(" ");sb.append("尾页\r\n");} else {sb.append("<a href='#' onclick='turnOverPage(").append((pageNo + 1)).append(")'>下一页</a>\r\n");sb.append(" ");sb.append("<a href='#' onclick='turnOverPage(").append(pageCount) .append(")'>尾页</a>\r\n");}sb.append(" 跳到<select onChange='turnOverPage(this.value)'>\r\n"); for (int i = 1; i <= pageCount; i++) {if (i == pageNo) {sb.append(" <option value='").append("' selected='selected'>第").append(i).append("页</option>\r\n");} else {sb.append(" <option value='").append(i).append("'>第").append(i).append("页</option>\r\n");}}sb.append("</select>\r\n");sb.append(" \r\n");sb.append("</form>\r\n");// 生成提交表单的JSsb.append("<script language='javascript'>\r\n");sb.append(" //翻页函数\t\n");sb.append(" function turnOverPage(no){\r\n");sb.append(" var form = document.pageController;\r\n");sb.append(" //页号越界处理\r\n");sb.append(" if(no").append(">").append(pageCount).append(") {\r\n");sb.append(" no=").append(pageCount).append(";\r\n");sb.append(" }\r\n");sb.append(" if(no").append("< 1){\r\n");sb.append(" no=1;\r\n");sb.append(" }\r\n");sb.append(" form.").append("pageNo").append(".value=no;\r\n");sb.append(" form.action='").append(url).append("';\r\n");sb.append(" form.submit();\r\n");sb.append(" }\r\n");sb.append("</script>\r\n");try {pageContext.getOut().println(sb.toString());} catch (IOException e) {e.printStackTrace();}return super.doStartTag();}}二、标签库描述文件：<?xml version="1.0" encoding="UTF-8"?><taglib version="2.0" xmlns="/xml/ns/j2ee"xmlns:xsi="/2001/XMLSchema-instance"xsi:schemaLocation="/xml/ns/j2ee web-jsptaglibrary_2_0.xsd"><tlib-version>2.0</tlib-version><short-name>my</short-name><uri>/qjyong</uri><tag><description>通用分页标签</description><name>pager</name><tag-class>com.qiujy.tags.PagerTag</tag-class><body-content>empty</body-content><attribute><name>pageNo</name><required>true</required><rtexprvalue>true</rtexprvalue></attribute><attribute><name>recordCount</name><required>true</required><rtexprvalue>true</rtexprvalue></attribute><attribute><name>pageSize</name><required>true</required><rtexprvalue>true</rtexprvalue></attribute><attribute><name>url</name><required>true</required><rtexprvalue>true</rtexprvalue></attribute></tag></taglib>三、把标签处理类和tld打成pager.jar包。