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刘铮 — Tue, 25 Sep 2007 06:37:00 GMT

自定义标�{�中控制逻辑的重要参敎ͼ�
在doStartTag()和doAfterBody()中用的到

SKIP_PAGE ---表示以下的逻辑处理都不�q�行�?br /> SKIP_BODY ---表示不运行body中的逻辑处理�?br /> EVAL_PAGE ---表示�l�箋�q�行java中的逻辑处理
EVAL_BODY_INCLUDE ---表示��标�{�中的body内容输出出来�?br /> EVAL_BODY_BUFFERED ---表示创徏了个新的buffer即BodyContent �q�由他来开始处理body

刘铮 2007-09-25 14:37 发表评论

jsp中怎样调用tld

刘铮 — Tue, 25 Sep 2007 02:12:00 GMT

jsp��面通过抬头�?/p> <%@ taglib uri="/XXXX" prefix="st"%>
的uri 扑ֈ��?br /> uri是指向tld的，有两�U�方法指向tld
一�U�是直接指向tld文�g所在的位置�Q�与tld中的uri的属�?lt;uri>XXXX一�?br /> 另一�U�是间接指向tld文�g位置�Q�也��是指向一�?XXX�Q�然后在web的配�|�文件中扑ֈ�对应�?br />
/XXX
tld的地址

�q�个时候在tld中就不需要进�?lt;uri>的配�|�了

刘铮 2007-09-25 10:12 发表评论

刘铮 — Tue, 25 Sep 2007 01:27:00 GMT

1 The JSP runtime reads a taglib directive at
the top of the JSP, indicating that this page
uses tags and where to find the TLD file for
the tag library or libraries it uses.
2 The JSP runtime next locates the TLD and
reads all the information about the library
from it.
3 The TLD’s information is placed in instances of the helper classes.
4 The runtime returns to reading the JSP. When it encounters a tag, it needs
to validate its usage, meaning: (1) checking if it is indeed a tag defined in
the TLD and (2) whether or not it is used properly (i.e., the tag has valid
attributes and proper body type). The TLD also informs it of the tag handler
class that implements this tag, in order for it to use that class in the
servlet being produced.
5 To validate the tag against the TLD, the runtime can make calls to the inmemory
helper objects, instead of referring to the TLD.

TLD的信息加载在TagLibraryInfo�Q�TagInfo�Q�TagAttributeInfo之中

刘铮 2007-09-25 09:27 发表评论

刘铮 — Mon, 24 Sep 2007 09:32:00 GMT

有body�Q?lt;bodycontent>JSP �q�里必须为JSP�Q�表明这个标�{�中有内�?�?body是指�?lt;text>dd,dd便�ؓbody
没有body�Q?lt;bodycontent>empty

刘铮 2007-09-24 17:32 发表评论

刘铮 — Mon, 24 Sep 2007 07:21:00 GMT

基本标签必须要满��三个文�?br /> 1。java文�g extends 有关Tag�c?br /> 2。tld文�g 让JSP runtime 知道怎么用标�{?br /> 3。web中部�|�标�{?br /> 例子�Q?br /> package book.simpletasks;
import java.io.IOException;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.tagext.TagSupport;
public class HelloWorldTag
extends TagSupport {
public int doStartTag()
throws JspException
{
try {
pageContext.getOut().print("Hello JSP tag World"); d
} catch(IOException ioe) { e
throw new JspTagException("Error:
IOException while writing to the user");
}
return SKIP_BODY;
}
}

PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.1//EN"
"http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd">

1.0
1.1
simp
http://www.manning.com/jsptagsbook/simple-taglib --------------�q�里可以不要

A simple sample tag library

hello
book.simpletasks.HelloWorldTag
empty

Say hello.

PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
"http://java.sun.com/j2ee/dtds/web-app_2.2.dtd">

http://www.manning.com/jsptagsbook/simple-taglib

/WEB-INF/simpletags.tld

使用时在jsp中加�?br /> <%@ taglib
uri="http://www.manning.com/jsptagsbook/simple-taglib"
prefix="jspx" %>

注意�U�色的部分要一一对应
保证在jsp��面装蝲的时候找得到tld文�g

刘铮 2007-09-24 15:21 发表评论