jsp / el과 jstl

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));