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分三步： 一、在WEB-INF 下建一个名为tlds的文件夹，再建一个tld文件，如 formatTime.tld，内容为： 复制代码 代码如下: <?xml version="1.0" encoding="ISO-8859-1" ?> <!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.1//EN" "http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd"> <taglib> <tlibversion>1.0</tlibversion> <jspversion>1.1</jspversion> <shortname>ntuc</shortname> <tag> <name>formatTimeAsString</name> <tagclass>com.ufinity.taglibTest.FormatTimeTag</tagclass> <bodycontent>empty</bodycontent> <attribute> <name>timestamp</name> </attribute> <attribute> <name>format</name> </attribute> <attribute> <name>showTH</name> </attribute> <attribute> <name>style</name> </attribute> </tag> </taglib> 二、建一个class，内容为： 复制代码 代码如下: package com.ufinity.taglibTest; import java.io.IOException; import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import java.util.Locale; import javax.servlet.jsp.tagext.TagSupport; /** * Description of the class * * @author Wangqy * @version 1.0 * @since 2009-8-25 */ public class FormatTimeTag extends TagSupport { /** * serialVersionUID long */ private static final long serialVersionUID = 8757501937718830491L; private String timestamp; private String format; private String showTH; private String style; public int doEndTag() { try { String info = this.convertDateTime(timestamp, format, Boolean.parseBoolean(showTH), style); pageContext.getOut().println(info); } catch (IOException e) { } return EVAL_PAGE; } private String convertDateTime(String dateTime, String formater, boolean showTH, String caseStyle) { String timePosted = null; SimpleDateFormat dateFm = null; DateFormat format = new SimpleDateFormat("yyyyMMddHHmmss"); Date formatTime = null; try { formatTime = format.parse(dateTime); } catch (ParseException e) { return null; } Calendar calendar = Calendar.getInstance(); calendar.setTime(formatTime); if (showTH) { int day = calendar.get(Calendar.DAY_OF_MONTH); String daySuffix = "th"; if ((day % 10) == 1) { daySuffix = ((day / 10) == 1) ? "th" : "st"; } else if ((day % 10) == 2) { daySuffix = (day == 12) ? "th" : "nd"; } else if ((day % 10) == 3) { daySuffix = (day == 13) ? "th" : "rd"; } formater = formater.substring(0, formater.indexOf(" ")) + "'" + daySuffix + "'" + formater.substring(formater.indexOf(" ")); dateFm = new SimpleDateFormat(formater, Locale.ENGLISH); } else { dateFm = new SimpleDateFormat(formater, Locale.ENGLISH); } timePosted = dateFm.format(formatTime); if (caseStyle.equals("Upper")) { timePosted = timePosted.toUpperCase(); } else if (caseStyle.equals("Lower")) { timePosted = timePosted.toLowerCase(); } return timePosted; } public void setFormat(String format) { this.format = format; } public void setShowTH(String showTH) { this.showTH = showTH; } public void setStyle(String style) { this.style = style; } public void setTimestamp(String timestamp) { this.timestamp = timestamp; } } 三、建个jsp页面测试下： 复制代码 代码如下: <%@ page language="java" pageEncoding="utf-8"%> <%@ taglib uri="WEB-INF/tlds/formatTime.tld" prefix="tf" %> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>自定义标签示例</title> </head> <body> <p> 转换“20090403132233” </p> format:dd MMMM yyyy showTH:true style:Upper 转换后为：<tf:formatTimeAsString timestamp="20090403132233" format="dd MMMM yyyy" showTH="true" style="Upper"/><br/> format:dd MMMM yyyy showTH:true style:Lower 转换后为：<tf:formatTimeAsString timestamp="20090403132233" format="dd MMMM yyyy" showTH="true" style="Lower"/><br/> format:dd MMMM yyyy showTH:false style:Upper 转换后为：<tf:formatTimeAsString timestamp="20090403132233" format="dd MMMM yyyy" showTH="false" style="Upper"/><br/> format:dd MMMM yyyy showTH:true style:"" 转换后为：<tf:formatTimeAsString timestamp="20090403132233" format="dd MMMM yyyy" showTH="true" style=""/><br/> </body> </html> ok了。这里timestamp是一个给定值，如果是通过${}标签动态取的话，需要将tld文件的 复制代码 代码如下: <attribute> <name>timestamp</name> </attribute> 修改为 复制代码 代码如下: <attribute> <name>timestamp</name> <rtexprvalue>true</rtexprvalue> </attribute> |
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