no servlet class on sun-java6 ?

abd_bela · 10-19-2008, 05:14 AM

Hi,
I have installed sun-java6 on debian lenny.
I took a program ( using servlet ) from a book, so I suppose it runs correctly, I tried it on my PC using sun-java6. Does it have another name?
Other programs, with (swing, applet ...), run correcly.
I searched servlet class in javax, I didn't find it
the error is at the import javax.servlet.*; import javax.servlet.http.*;

here is the example

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class CalculPerimeter extends HttpServlet {
public void doGet( HttpServletRequest req, HttpServletResponse rep)
throws IOException, ServletException {
rep.setContentType("text/html");
PrintWriter pw = rep.getWriter();
pw.println("<html>");
pw.println("<head>");
pw.println("<title> Just a servlet </title>");
pw.println("</head>");
pw.println("<body bgcolor='white'>");
if (req.getParameter("ray") == null) {
pw.print("<font size=+1> ");
pw.println(" need to know the value of the ray!</font>");
}
else {
int tmp=Integer.parseInt(req.getParameter("ray"));
Circle C = new Circle(0, 0, tmp);
double p = C.perimeter();
pw.println("The ray is "+tmp+"perimeter "+ p);
}
pw.println("</body>");
pw.println("</html>");
}
}

The Circle class is of couse defined.
Thanks for help

Mega Man X · 10-19-2008, 06:07 AM

Quote:

Originally Posted by abd_bela

Hi,
I have installed sun-java6 on debian lenny.
I took a program ( using servlet ) from a book, so I suppose it runs correctly, I tried it on my PC using sun-java6. Does it have another name?
Other programs, with (swing, applet ...), run correcly.
I searched servlet class in javax, I didn't find it
the error is at the import javax.servlet.*; import javax.servlet.http.*;

here is the example

Code:

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class CalculPerimeter extends HttpServlet {
    public void doGet( HttpServletRequest req, HttpServletResponse rep)
	        throws IOException, ServletException {
	 rep.setContentType("text/html");
	 PrintWriter pw = rep.getWriter();
	 pw.println("<html>");
	 pw.println("<head>");
	 pw.println("<title> Just a servlet </title>");
	 pw.println("</head>");
	 pw.println("<body bgcolor='white'>");
	 if (req.getParameter("ray") == null) {
		pw.print("<font size=+1> ");		
		pw.println(" need to know the value of the ray!</font>");
	 }
	 else {
		int tmp=Integer.parseInt(req.getParameter("ray"));
		Circle C = new Circle(0, 0, tmp);
		double p = C.perimeter();
		pw.println("The ray is "+tmp+"perimeter "+ p);
	 }
	 pw.println("</body>");
	 pw.println("</html>");
    }
}

The Circle class is of couse defined.
Thanks for help

You will need to add servlet.jar to your classpath. If you download apache-tomcat, you will have that jar within the "lib" folder of Tomcat.

Personally, I would recommend you to download "Eclipse IDE for Java EE Developers", so you don't have to worry about those things

. Netbeans actually even helps you to install Tomcat and/or Glassfish during installation. A big help indeed. I know recommending an IDE sounds overkill, but Servlets and JSP are a complex matter. It gets even more tough when you put in some frameworks like Hibernate or Struts. You will need an IDE, so you better off start with one, IMHO.

P.S: in the future, when posting code, please use the <code> tags as I just did. Makes it much easier on the eyes