Learning JSP

Servlets and JSP

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Servlets

A simple "HelloWorld" servlet, that also prints the current date.

 

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

In order to run it, do the following:

  1. Place it in a file, HelloWorld.java
  2. Compile it.
  3. Place the resulting HelloWorld.class file in the "servlets" directory.
  4. Run it by pointing browser to: http://server.address/servlets/HelloWorld

 

JSP

The same page as above using JSP looks as shown below:

 

<HTML>
 <HEAD>
  <TITLE>Hello World</TITLE>
 </HEAD>
 <BODY>
  <H1>Hello World</H1>
  Today is: <%= new java.util.Date().toString() %>
 </BODY>
</HTML>

 

In order to run it, do the following:

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

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Created by Deepak Kumar (dkumar@acm.org)