jspカスタムラベルインスタンス

ステップ3:
一、WEB-INFの下にtldsというフォルダを作成し、formatTimeのようなtldファイルを再構築する.tld、内容は:

 
  
 
  
br>"http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd"> 
  
 
  
1.0 
  
1.1 
  
ntuc 
  
 
  
formatTimeAsString 
  
com.ufinity.taglibTest.FormatTimeTag 
  
empty 
  
 
  
timestamp 
  
 
  
 
  
format 
  
 
  
 
  
showTH 
  
 
  
 
  
style 
  
 
  
 
  
 
  
 
 

二、classを建設し、内容は以下の通りである.

 
  
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、jspページのテストを作成する.

 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 “20090403132233” 
  
 
  
format:dd MMMM yyyy showTH:true style:Upper  ：
 
  
format:dd MMMM yyyy showTH:true style:Lower  ：
 
  
format:dd MMMM yyyy showTH:false style:Upper  ：
 
  
format:dd MMMM yyyy showTH:true style:""  ：
 
  
 
  
 
  
 
 

OKです.ここでtimestampは所定の値であり、${}タグで動的に取り出す場合はtldファイルの

 
  
 
  
timestamp 
  
 
  
 
 

次のように変更

 
  
 
  
timestamp 
  
true