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* 코드와 파일 구조를 통해 확인
- 자잘한 파일은 코드는 확인하지 않고 어떻게 컴파일 되는지에 대해서 확인하겠다.
1) @include 지시어
#includeex.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<h2>include 활용</h2>
<%String name= "zeroco";%>
<%@ include file="top.jsp" %>
포함하는 페이지 지시어 include 예제의 내용.
<%@ include file="bottom.jsp" %>
</body>
</html>
파일이 컴파일된 곳. E:\myHTML\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\work\Catalina\localhost\myWeb\org\apache\jsp\directive 에서 컴파일된 jsp 파일을 확인해보면 includeex.class로 만 컴파일 된 것을 볼 수 있다.
즉 include지시자를 통해 삽입된 페이지들은 모두 하나로 합쳐져서 컴파일 된 것이다.
/*
* Generated by the Jasper component of Apache Tomcat
* Version: Apache Tomcat/9.0.43
* Generated at: 2021-02-19 08:12:42 UTC
* Note: The last modified time of this file was set to
* the last modified time of the source file after
* generation to assist with modification tracking.
*/
package org.apache.jsp.directive;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import java.util.*;
public final class includeex_jsp extends org.apache.jasper.runtime.HttpJspBase
implements org.apache.jasper.runtime.JspSourceDependent,
org.apache.jasper.runtime.JspSourceImports {
private static final javax.servlet.jsp.JspFactory _jspxFactory =
javax.servlet.jsp.JspFactory.getDefaultFactory();
private static java.util.Map<java.lang.String,java.lang.Long> _jspx_dependants;
static {
_jspx_dependants = new java.util.HashMap<java.lang.String,java.lang.Long>(2);
_jspx_dependants.put("/directive/bottom.jsp", Long.valueOf(1613722332000L));
_jspx_dependants.put("/directive/top.jsp", Long.valueOf(1613634322000L));
}
private static final java.util.Set<java.lang.String> _jspx_imports_packages;
private static final java.util.Set<java.lang.String> _jspx_imports_classes;
static {
_jspx_imports_packages = new java.util.HashSet<>();
_jspx_imports_packages.add("javax.servlet");
_jspx_imports_packages.add("java.util");
_jspx_imports_packages.add("javax.servlet.http");
_jspx_imports_packages.add("javax.servlet.jsp");
_jspx_imports_classes = null;
}
private volatile javax.el.ExpressionFactory _el_expressionfactory;
private volatile org.apache.tomcat.InstanceManager _jsp_instancemanager;
public java.util.Map<java.lang.String,java.lang.Long> getDependants() {
return _jspx_dependants;
}
public java.util.Set<java.lang.String> getPackageImports() {
return _jspx_imports_packages;
}
public java.util.Set<java.lang.String> getClassImports() {
return _jspx_imports_classes;
}
public javax.el.ExpressionFactory _jsp_getExpressionFactory() {
if (_el_expressionfactory == null) {
synchronized (this) {
if (_el_expressionfactory == null) {
_el_expressionfactory = _jspxFactory.getJspApplicationContext(getServletConfig().getServletContext()).getExpressionFactory();
}
}
}
return _el_expressionfactory;
}
public org.apache.tomcat.InstanceManager _jsp_getInstanceManager() {
if (_jsp_instancemanager == null) {
synchronized (this) {
if (_jsp_instancemanager == null) {
_jsp_instancemanager = org.apache.jasper.runtime.InstanceManagerFactory.getInstanceManager(getServletConfig());
}
}
}
return _jsp_instancemanager;
}
public void _jspInit() {
}
public void _jspDestroy() {
}
public void _jspService(final javax.servlet.http.HttpServletRequest request, final javax.servlet.http.HttpServletResponse response)
throws java.io.IOException, javax.servlet.ServletException {
if (!javax.servlet.DispatcherType.ERROR.equals(request.getDispatcherType())) {
final java.lang.String _jspx_method = request.getMethod();
if ("OPTIONS".equals(_jspx_method)) {
response.setHeader("Allow","GET, HEAD, POST, OPTIONS");
return;
}
if (!"GET".equals(_jspx_method) && !"POST".equals(_jspx_method) && !"HEAD".equals(_jspx_method)) {
response.setHeader("Allow","GET, HEAD, POST, OPTIONS");
response.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED, "JSP들은 오직 GET, POST 또는 HEAD 메소드만을 허용합니다. Jasper는 OPTIONS 메소드 또한 허용합니다.");
return;
}
}
final javax.servlet.jsp.PageContext pageContext;
javax.servlet.http.HttpSession session = null;
final javax.servlet.ServletContext application;
final javax.servlet.ServletConfig config;
javax.servlet.jsp.JspWriter out = null;
final java.lang.Object page = this;
javax.servlet.jsp.JspWriter _jspx_out = null;
javax.servlet.jsp.PageContext _jspx_page_context = null;
try {
response.setContentType("text/html; charset=UTF-8");
pageContext = _jspxFactory.getPageContext(this, request, response,
null, true, 8192, true);
_jspx_page_context = pageContext;
application = pageContext.getServletContext();
config = pageContext.getServletConfig();
session = pageContext.getSession();
out = pageContext.getOut();
_jspx_out = out;
out.write("\r\n");
out.write("<!DOCTYPE html>\r\n");
out.write("<html>\r\n");
out.write("<head>\r\n");
out.write("<meta charset=\"UTF-8\">\r\n");
out.write("<title>Insert title here</title>\r\n");
out.write("</head>\r\n");
out.write("<body>\r\n");
out.write("\t<h2>include 활용한 예제</h2>\r\n");
out.write("\t");
String name= "zeroco";
out.write('\r');
out.write('\n');
out.write(' ');
out.write("\r\n");
out.write(" \r\n");
out.write(" ");
Date date = new Date();
out.write("\r\n");
out.write("<!DOCTYPE html>\r\n");
out.write("<html>\r\n");
out.write("<head>\r\n");
out.write("<meta charset=\"UTF-8\">\r\n");
out.write("<title>Insert title here</title>\r\n");
out.write("</head>\r\n");
out.write("<body>\r\n");
out.write("top.jsp 페이지의 내용입니다.<br><br>\r\n");
out.print(date.toString() );
out.write("<br><br>\r\n");
out.write("<hr color=\"red\">\r\n");
out.write("\r\n");
out.write("</body>\r\n");
out.write("</html>");
out.write("\r\n");
out.write("\t포함하는 페이지 지시어 include 예제의 내용.\r\n");
out.write("\t");
out.write("\r\n");
out.write("<!DOCTYPE html>\r\n");
out.write("<html>\r\n");
out.write("<head>\r\n");
out.write("<meta charset=\"UTF-8\">\r\n");
out.write("<title>Insert title here</title>\r\n");
out.write("</head>\r\n");
out.write("<body>\r\n");
out.write("\r\n");
out.write("<hr color=\"red\">\r\n");
out.write("작성자 <b>");
out.print( name);
out.write("</b> 입니다.\r\n");
out.write("</body>\r\n");
out.write("</html>");
out.write("\r\n");
out.write("</body>\r\n");
out.write("</html>");
} catch (java.lang.Throwable t) {
if (!(t instanceof javax.servlet.jsp.SkipPageException)){
out = _jspx_out;
if (out != null && out.getBufferSize() != 0)
try {
if (response.isCommitted()) {
out.flush();
} else {
out.clearBuffer();
}
} catch (java.io.IOException e) {}
if (_jspx_page_context != null) _jspx_page_context.handlePageException(t);
else throw new ServletException(t);
}
} finally {
_jspxFactory.releasePageContext(_jspx_page_context);
}
}
}
변환된 서블릿을 확인하더라도 서비스 메서드 내에서 합쳐진 것을 알 수 있다.
2) <jsp:include>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
String pageTitle = (String) request.getAttribute("PAGETITLE");
String contentPage = request.getParameter("CONTENTPAGE");
%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Include를 활용한 jsp 모듈화 예제 </title>
</head>
<body>
<table width="400" border="1" cellpadding="2" cellspacing="0">
<tr>
<td colspan="2">
<jsp:include page="/temp/module/top.jsp" flush="false"/>
</td>
</tr>
<tr>
<td width="100" valign="top">
<jsp:include page="/temp/module/left.jsp" flush="false"/>
</td>
<td width="100" valign="top">
<jsp:include page="<%= contentPage %>" flush="false"/>
</td>
</tr>
<tr>
<td colspan="2">
<jsp:include page="/temp/module/bottom.jsp" flush="false"/>
</td>
</tr>
</table>
</body>
</html>
include 액션태그로 포함된 파일들은 각각 따로 컴파일 되어 별도로 만들어져 있는 것을 확인할 수 있다.
참고
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