niit源码--Developing java applications using servlet and jsp1

//GenericServlet
public class SettingCntx extends GenericServlet
{    
    ServletContext ctx;    //ServletContext 
    public void init(ServletConfig cfig){
    /*Obtain the ServletContext object*/    

    }
    public void service(ServletRequest request, ServletResponse repose)
        throws ServletException, IOexception {
        /*Set the context attribute*/
        ctx.setAttribute("URL","jdbc:odbc:EmployeesDB");
        /*Obtain the PrintWriter object*/
        PrintWrter pw=respone.getWriter();
        respone.setContentType("text/html");
        pw.println("<B>The JDBC URL has been set as a context attribute </b>");
    }
}

The RetrievingCntx servlet retrieves the url attribute and displays the value of the attribute.You can use the following code to create the servlet,RetrievingCntx to retrieve and display the url:

import javax.servlet.*;
import java.io.*;

public class RetrievingCntx extends GenericServlet
{
    ServletContext ctx;
    String  url;

    public void init(ServletConfig cifg){
        /*Obtain the ServletContext object*/
        ctx =cfig.getServletContext();
    }
    public void service (ServletRequest request,ServletResponse response)
        throws ServletException,IOException {
            url=(String)ctx.getAttribute("URL");
            PrinterWriter pw=response.getWriter();
            response.setContentType("text/html");
            pw.println("<B>The url value is </B> "+url+<BR>);
        }
}