Here we will see to write the JSP. And look how this will be converted into Java by container.
Tools/Technology Used
- Eclipse Indigo
- Apache Tomcat 7
- JDK 1.5
We will first create a web application in Eclipse and write a welcome JSP for the same.
Welcome.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<% out.println("Hello"); %>
</body>
</html>
This is the JSP which we have created in web application inside WebContent folder. Once we run the web application in Apache Server. Container will generate the Java file for it and then compile it.
Generated Java File for Above JSP /Compiled JSP
Welcome_jsp.java will be the name of generated Java file.
/*
* Generated by the Jasper component of Apache Tomcat
* Version: Apache Tomcat/7.0.30
* Generated at: 2012-11-03 07:26:27 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;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
public final class Welcome_jsp extends org.apache.jasper.runtime.HttpJspBase
implements org.apache.jasper.runtime.JspSourceDependent {
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;
private javax.el.ExpressionFactory _el_expressionfactory;
private org.apache.tomcat.InstanceManager _jsp_instancemanager;
public java.util.Map<java.lang.String,java.lang.Long> getDependants() {
return _jspx_dependants;
}
public void _jspInit() {
_el_expressionfactory = _jspxFactory.getJspApplicationContext(getServletConfig().getServletContext()).getExpressionFactory();
_jsp_instancemanager = org.apache.jasper.runtime.InstanceManagerFactory.getInstanceManager(getServletConfig());
}
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 {
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=ISO-8859-1");
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("rn");
out.write("<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">rn");
out.write("<html>rn");
out.write("<head>rn");
out.write("<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">rn");
out.write("<title>Insert title here</title>rn");
out.write("</head>rn");
out.write("<body>rn");
out.write("t");
out.println("Hello");
out.write("rn");
out.write("</body>rn");
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 { 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);
}
}
}
Location of precompiled JSP in Tomcat
As we are using Tomcat with Eclipse compiled JSP location can be different according to configuration. To know the exact location of compiled JSP click the Apache server entry in Servers view, it will display the server configuration. In Server Location tab check for the radio button. Here you can set server path and deploy path. You can choose workspace metadata / Tomcat installation directory / Custom location.
To know the exact location of compiled JSP go to
$ServerPathworkCatalinalocalhost$webApplicationName…
ServerPath can be taken from server configuration detail screen. As shown above.
Location in WebLogic Application Server
\bea\user_projects\domains\<DOMAIN_NAME>\servers\