Jsp tag file例子以及说明(20)

          throw (java.lang.IllegalStateException) t; 
      if( t instanceof javax.servlet.jsp.JspException ) 
          throw (javax.servlet.jsp.JspException) t; 
      throw new javax.servlet.jsp.JspException(t); 
    } finally { 
      jspContext.getELContext().putContext(javax.servlet.jsp.JspContext.class,super.getJspContext()); 
      ((org.apache.jasper.runtime.JspContextWrapper) jspContext).syncEndTagFile(); 
    } 
  } 

例子7 嵌套引入tag file
taglibDemoTest.jsp
[java] 
<%@ taglib prefix="easy" tagdir="/WEB-INF/tags" %> 
<easy:taglibDemo/>//引入tag 

tagliDemo.tag
[java] 
<%@ taglib prefix="simple" tagdir="/WEB-INF/tags" %> 
The server's date: <simple:firstTag>//继续嵌套引入tag\ 

firstTag.tag
[java]
<%@ tag import="java.util.Date" import="java.text.DateFormat"%> 
<% 
  DateFormat dateFormat = DateFormat.getDateInstance(DateFormat.LONG); 
  Date now = new Date(System.currentTimeMillis()); 
  out.println(dateFormat.format(now)); 
%> 

例子8 调用tag file的变量
varDemoTest.jsp
[java]
<%@ taglib prefix="tags" tagdir="/WEB-INF/tags" %> 
Today's date: 
<br/> 
<tags:varDemo> 
In long format: ${longDate} 
<br/> 
In short format: ${shortDate} 
</tags:varDemo> 

varDemo.tag
[java] 
<%@ tag import="java.util.Date" import="java.text.DateFormat"%> 
<%@ variable name-given="longDate" %> 
<%@ variable name-given="shortDate" %> 
<% 
  Date now = new Date(System.currentTimeMillis()); 
  DateFormat longFormat = DateFormat.getDateInstance(DateFormat.LONG); 
  DateFormat shortFormat = DateFormat.getDateInstance(DateFormat.SHORT); 
  jspContext.setAttribute("longDate", longFormat.format(now)); 
  jspContext.setAttribute("shortDate", shortFormat.format(now)); 
%> 
<jsp:doBody/>//说明要让jsp编译的java类回调，所以jsp编译的java类有Helper类封装JspFragment(即tag编译后的java类)