package cs320.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet(urlPatterns = "/RequestCounter", loadOnStartup = 1)
public class RequestCounter extends HttpServlet {
private static final long serialVersionUID = 1L;
public RequestCounter()
{
super();
}
public void init( ServletConfig config ) throws ServletException
{
// When you override init(), don't forget to call the super class
// init() first.
super.init( config );
// Note that Java automatically converts between int and Integer
// (i.e. the "Autoboxing and Unboxing" feature since JDK 1.5.
int counter = 0;
getServletContext().setAttribute( "counter", counter );
}
protected void doGet( HttpServletRequest request,
HttpServletResponse response ) throws ServletException, IOException
{
ServletContext servletContext = getServletContext();
// get the counter
Integer counter = (Integer) servletContext.getAttribute( "counter" );
// increment the counter
++counter;
// save it back the application scope
servletContext.setAttribute( "counter", counter );
// display the message "the counter is incremented"
PrintWriter out = response.getWriter();
response.setContentType( "text/html" );
out.println( "<html><head><title>Request Counter</title></head><body>" );
out.println( "<p>The counter is incremented.</p>" );
out.println( "</body></html>" );
}
}