Programming/jsp2014.04.13 00:05
el과 jstl을 쓰니 엄청나게 jsp.java 파일이 지저분해진다 -_-a
JSTL은 EL을 확장해서 만든 Jsp Standard Tag Library이다 보니
기본적으로 EL에서 사용하는 기능에 tag library 관련하여 더많은 내용을 초기화 하게 된다.

el 사용시
public final class elEx1_jsp extends org.apache.jasper.runtime.HttpJspBase
    implements org.apache.jasper.runtime.JspSourceDependent {

  private static final JspFactory _jspxFactory = JspFactory.getDefaultFactory();

  private static java.util.List _jspx_dependants;

  private javax.el.ExpressionFactory _el_expressionfactory;
  private org.apache.AnnotationProcessor _jsp_annotationprocessor;

  public Object getDependants() {
    return _jspx_dependants;
  }

  public void _jspInit() {
    _el_expressionfactory = _jspxFactory.getJspApplicationContext(getServletConfig().getServletContext()).getExpressionFactory();
    _jsp_annotationprocessor = (org.apache.AnnotationProcessor) getServletConfig().getServletContext().getAttribute(org.apache.AnnotationProcessor.class.getName());
  }

  public void _jspDestroy() {
  }

  public void _jspService(HttpServletRequest request, HttpServletResponse response)
        throws java.io.IOException, ServletException {

    PageContext pageContext = null;
    HttpSession session = null;
    ServletContext application = null;
    ServletConfig config = null;
    JspWriter out = null;
    Object page = this;
    JspWriter _jspx_out = null;
    PageContext _jspx_page_context = null; 
  }

EL 문법은 바로 처리되는게 아니라
Evaluate 되어서 String으로 변환되어 출력된다.
out.write((java.lang.String) org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate("${2 + 5}", java.lang.String.class, (PageContext)_jspx_page_context, null, false)); 


jstl 사용시
public final class use_005fforeach_005ftag_jsp extends org.apache.jasper.runtime.HttpJspBase
    implements org.apache.jasper.runtime.JspSourceDependent {

  private static final JspFactory _jspxFactory = JspFactory.getDefaultFactory();

  private static java.util.List _jspx_dependants;

  private org.apache.jasper.runtime.TagHandlerPool _005fjspx_005ftagPool_005fc_005fset_0026_005fvar_005fvalue_005fnobody;
  private org.apache.jasper.runtime.TagHandlerPool _005fjspx_005ftagPool_005fc_005fforEach_0026_005fvar_005fstep_005fend_005fbegin;
  private org.apache.jasper.runtime.TagHandlerPool _005fjspx_005ftagPool_005fc_005fforEach_0026_005fvar_005fend_005fbegin;
  private org.apache.jasper.runtime.TagHandlerPool _005fjspx_005ftagPool_005fc_005fforEach_0026_005fvarStatus_005fvar_005fitems_005fbegin;
  private org.apache.jasper.runtime.TagHandlerPool _005fjspx_005ftagPool_005fc_005fforEach_0026_005fvar_005fitems;

  private javax.el.ExpressionFactory _el_expressionfactory;
  private org.apache.AnnotationProcessor _jsp_annotationprocessor;

  public Object getDependants() {
    return _jspx_dependants;
  }

  public void _jspInit() {
    _005fjspx_005ftagPool_005fc_005fset_0026_005fvar_005fvalue_005fnobody = org.apache.jasper.runtime.TagHandlerPool.getTagHandlerPool(getServletConfig());
    _005fjspx_005ftagPool_005fc_005fforEach_0026_005fvar_005fstep_005fend_005fbegin = org.apache.jasper.runtime.TagHandlerPool.getTagHandlerPool(getServletConfig());
    _005fjspx_005ftagPool_005fc_005fforEach_0026_005fvar_005fend_005fbegin = org.apache.jasper.runtime.TagHandlerPool.getTagHandlerPool(getServletConfig());
    _005fjspx_005ftagPool_005fc_005fforEach_0026_005fvarStatus_005fvar_005fitems_005fbegin = org.apache.jasper.runtime.TagHandlerPool.getTagHandlerPool(getServletConfig());
    _005fjspx_005ftagPool_005fc_005fforEach_0026_005fvar_005fitems = org.apache.jasper.runtime.TagHandlerPool.getTagHandlerPool(getServletConfig());
    _el_expressionfactory = _jspxFactory.getJspApplicationContext(getServletConfig().getServletContext()).getExpressionFactory();
    _jsp_annotationprocessor = (org.apache.AnnotationProcessor) getServletConfig().getServletContext().getAttribute(org.apache.AnnotationProcessor.class.getName());
  }

  public void _jspDestroy() {
    _005fjspx_005ftagPool_005fc_005fset_0026_005fvar_005fvalue_005fnobody.release();
    _005fjspx_005ftagPool_005fc_005fforEach_0026_005fvar_005fstep_005fend_005fbegin.release();
    _005fjspx_005ftagPool_005fc_005fforEach_0026_005fvar_005fend_005fbegin.release();
    _005fjspx_005ftagPool_005fc_005fforEach_0026_005fvarStatus_005fvar_005fitems_005fbegin.release();
    _005fjspx_005ftagPool_005fc_005fforEach_0026_005fvar_005fitems.release();
  }

  public void _jspService(HttpServletRequest request, HttpServletResponse response)
        throws java.io.IOException, ServletException {

    PageContext pageContext = null;
    HttpSession session = null;
    ServletContext application = null;
    ServletConfig config = null;
    JspWriter out = null;
    Object page = this;
    JspWriter _jspx_out = null;
    PageContext _jspx_page_context = null;
  }
 

EL과는 인자가 하나 null 에서 변경된다.
out.write((java.lang.String) org.apache.jasper.runtime.PageContextImpl.proprietarEvaluate("${e:dateFormat(today) }", java.lang.String.class, (PageContext)_jspx_page_context, _jspx_fnmap_0, false)); 

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