docs:programming:jsp:servlets_and_jsp [hartungdesign.net wiki]

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====== Servlets and JSP ======

===== Servlets =====
A simple "HelloWorld" servlet, that also prints the current date.
<code java> 
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;


public class HelloWorld extends HttpServlet {


   public void doGet(HttpServletRequest req, HttpServletResponse res)
			throws ServletException, IOException {


	res.setContentType("text/html");
	PrintWriter out = res.getWriter();


	out.println("<HTML>");
	out.println("<HEAD><TITLE>Hello World</TITLE></HEAD>");
	out.println("<BODY>");
	out.println("<H1>Hello World</H1>");
	out.println("Today is: " + (new java.util.Date().toString()) );
	out.println("</BODY></HTML>");
   } // doGet

} // HelloWorld
</code>

In order to run it, do the following:

  - Place it in a file, HelloWorld.java
  - Compile it.
  - Place the resulting HelloWorld.class file in the "servlets" directory.
  - Run it by pointing browser to: http://server.address/servlets/HelloWorld 
 
===== JSP =====
The same page as above using JSP looks as shown below:
<code>
<HTML>
 <HEAD>
  <TITLE>Hello World</TITLE>
 </HEAD>
 <BODY>
  <H1>Hello World</H1>
  Today is: <%= new java.util.Date().toString() %>
 </BODY>
</HTML>
</code> 

In order to run it, do the following:

  - Place it in a file, HelloWorld.jsp in the same directory as your .html files
  - Run it by pointing browser to: http://server.address/~youraccount/HelloWorld.jsp