I.
BodyTag ¶õ
´Ü¼øű×(Simple Tag)´Â ¸öü¸¦
Çѹø¸¸ ó¸®ÇÏÁö¸¸, BodyTag ´Â ¸öü¸¦ ¿©·¯ ¹ø ó¸®ÇÒ ¼ö ÀÖ´Ù.
|
inteface javax.servlet.jsp.tagext.BodyTag |
|
+EVAL_BODY_TAG:int |
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+doInitBody:void
|
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interface javax.servlet.tagext.Tag |
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+EVAL_BODY_INCLUDE :int +EVAL_PAGE:int +SKIP_BODY:int +SKIP_PAGE:int |
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+release():void +getParent():javax.servlet.jsp.tagext.Tag +getParent(:javax.servlet.jsp.tagext.Tag):void +doEndTag():int +doStartTag():int +getPageContext(:javax.servlet.jsp.PageContext):void |
BodyTag ÀÎÅÍÆäÀ̽º´Â
Tag ÀÎÅÍÆäÀ̽º¸¦ »ó¼ÓÇÏ¿© ¸¸µé¾îÁö¸ç ¸î°¡ÁöÀÇ ¸Þ¼µå¸¦ Á¦°øÇÑ´Ù.
BodyContent Ŭ·¡½º´Â
¸öü¸¦ ¿©·¯ ¹ø ó¸®ÇÒ ¼ö ÀÖµµ·Ï ÇÑ´Ù.
1. SKIP_BODY ¸¦ ¸®ÅÏÇÒ¶§±îÁö ¼øȯ
setPageContext(javax.servlet.jsp.PageContext):void
2. setParent(javax.servlet.jsp.tagext.Tag):void
3. //setAttribute()
4. doStartTag():int
5. setBodyContent(javax.servlet.jsp.tagext.BodyContent):void
6. doInitBody():void
7. doAfterBody():int
8. doEndTag():int
9. release():void
ÄÁÅ×À̾ ÀÇÇؼ BodyTag ´Â BodyContent
Ŭ·¡½º¸¦ °®´Âµ¥ BodyContent´Â ´ÙÀ½°ú
°°´Ù.
Javax.servlet.tagext.BodyContent
|
|
-enclosingWriter:javax.servlet.jsp.JspWriter |
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+BodyContent(:javax.servlet.jsp.JspWriter) +getString():java.lang.String +getReader():java.io.Reader +writeOut(:java.io.Writer):void +getEnclosingWriter():javax.servlet.jsp.JspWriter +clearBody():void |
BodyContent Ŭ·¡½º´Â
JspWriter Ŭ·¡½º¸¦ »ó¼Ó¹Þ´Âµ¥ ÀÌ´Â ¸öü¸¦ ³ªÁß¿¡(?)ó¸®ÇÒ ¼ö ÀÖµµ·Ï ÇÒ ¼ö ÀÖµµ·ÏÇÑ´Ù.
BodyContent Ŭ·¡½ºÀÇ
content ´Â getReader() ¸Þ¼µå°¡ ¸®ÅÏÇÏ´Â Reader ¸¦ ÅëÇØ ÀÐÀ» ¼ö ÀÖ´Ù.
content´Â ¶ÇÇÑ getString()¸Þ¼µå¸¦
È£ÃâÇϹǷνá StringÀ¸·Î ÀÐÀ» ¼ö ÀÖ´Ù.
BodyContent ÀÇ content
´Â clearBody()¸Þ¼µå·Î ºñ¿ï ¼ö ÀÖ´Ù.
BodyContent ÀÇ content¸¦
¾²±âÀ§Çؼ´Â writer (getEnclosingWriter() ¸Þ¼µå¿¡ ÀÇÇÏ¿© ¸®ÅϵǴ JspWriteró·³)
·Î writOut()¸Þ¼µå¸¦ È£ÃâÇÒ ¼ö
ÀÖ´Ù.
II.
BodyTagÀÇ
ÀÛ¼º
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tag.LoopTag |
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-parent:Tag -bodyContent:BodyContent -pageContext:PageContext -iterations:int=0 |
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+LoopTag() +setPageContext(PageContext:PageContext):void +setParent(parent:javax.servlet.jsp.tagext.Tag):void +setIterations(iterations:int):void +doStartTag():int +setBodyContent(bodyContent:BodyContent):void +doInitBody():void +doAfterBody():int +doEndTag():int +release():void +getParent():javax.servlet.jsp.tagext.Tag |
<LoopTag.java>
package tag;
import
javax.servlet.jsp.*;
import
javax.servlet.jsp.tagext.*;
public class
LoopTag implements BodyTag{
private Tag
parent;
private
BodyContent bodyContent;
private
PageContext pageContext;
private int
iterations = 0;
public
LoopTag(){super();}
public void
setPageContext(PageContext pageContext){
this.pageContext
= pageContext;
}
public void
setParent(final javax.servlet.jsp.tagext.Tag parent){
this.parent
= parent;
}
public
void setIterations(int iteratons){
this.iterations
= iterations;
}
public
int doStartTag() throws JspTagException{
if(iterations
> 0){
return
EVAL_BODY_TAG;
}else{
return
SKIP_BODY;
}
}
public
void setBodycontent(BodyContent bodyContent){
this.bodyContent
= bodyContent;
}
public
void doInitBody() throws JspTagException{}
public
int doAfterBody() throws JspTagException{
if(iterations
> 1){
iterations--;
return
EVAL_BODY_TAG;
}else{
return
SKIP_BOY;
}
}
public
int doEndTag() throws JspTagException{
try{
if(bodyContent
!= null){
bodyContent.writeOut(bodyContent.getEnclosingWriter());
}
}catch(java.io.IOException
e){
throw
new JspTagException(¡°IO Error : ¡° + e.getMessage());
}
return
EVAL_PAGE;
}
public
void relese();
public
javax.servlet.jsp.tagext.Tag getParent(){
return
parent;
}
}
III.
Tag
Library ¼³¸íÀÚ µî·Ï
<mytag.tld>
<tag>
<name>loop</name>
<tagclass> tag.LoopTag</tagclass>
<bodycontent>JSP</bodycontent>
<info>A BodyTag for looping</info>
<attribute>
<name>iterations</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
IV.
JSPÆÄÀÏ ÀÛ¼º
<loop.jsp>
<%@ page contentType=¡±text/html;charset=EUC-KR¡± %>
<%@ taglib uri=¡±taglibExample¡± prefix=¡±mt¡±>
<HTML>
<HEAD>
<TITLE>Loop
Test</TITLE>
</HEAD>
<BODY BGCOLOR=¡±#FFFFFF¡±>
<HR>
<mt:loop
iterations=¡±5¡±>
Hello<BR>
<mt:loop/>
<HR>
</BODY>
</HTML>