Three-step:
First, under the Web-inf to build a folder named TLDs, and then build a TLD file, such as FORMATTIME.TLD, the content is:
Copy Code code as follows:
<?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>
Second, the construction of a class, the content is:
Copy Code code as follows:
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;
}
}
Third, the establishment of a JSP page test:
Copy Code code as follows:
<%@ page language= "java" pageencoding= "Utf-8"%>
<%@ taglib uri= "Web-inf/tlds/formattime.tld" prefix= "TF"%>
<meta http-equiv= "Content-type" content= "text/html; charset=gb2312 "/>
<title> Custom Label Example </title>
<body>
<p>
Convert "20090403132233"
</p>
FORMAT:DD MMMM yyyy showth:true Style:upper converted to: <tf:formattimeasstring timestamp= "20090403132233" format= "DD MMMM yyyy "showth=" true "style=" Upper "/><br/>
FORMAT:DD MMMM yyyy showth:true Style:lower converted to: <tf:formattimeasstring timestamp= "20090403132233" format= "DD MMMM yyyy "showth=" true "style=" Lower "/><br/>
FORMAT:DD MMMM yyyy showth:false Style:upper converted to: <tf:formattimeasstring timestamp= "20090403132233" format= "DD MMMM yyyy "Showth=" false "style=" Upper "/><br/>
FORMAT:DD MMMM yyyy showth:true style: "" After conversion: <tf:formattimeasstring timestamp= "20090403132233" format= "dd MMMM yyyy "Showth=" true "style=" "/><br/>
</body>
OK, okay. Here timestamp is a given value and if it is dynamically fetched through the ${} tag, you need to add the TLD file's
Copy Code code as follows:
<attribute>
<name>timestamp</name>
</attribute>
Amended to
Copy Code code as follows:
<attribute>
<name>timestamp</name>
<rtexprvalue>true</rtexprvalue>
</attribute>
