Simple Counter in Servlet
In this example we are going to know how we can make a
program on counter which will keep track how many times the servlet has been
accessed.
To make this program firstly we have to make one class SimpleCounterInServlet.
The name of the class should follow the naming convention. Remember to
keep the name of the class in such a way that it becomes easy to understand what
the program is going to do just by seeing the class name. After making a class
define one variable counter which will keep record for how many times the
servlet has been accessed. Now use method either doGet() or doPost() to
write a logic of the program. Our program logic is simple. We have to just
increment the value of the counter by 1. To display the output use the method getWriter()
method of the response object which will in turn return the object of the
PrintWriter class. Now display the value of the counter.
The code of the program is given below:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class SimpleCounter extends HttpServlet{
int counter = 0;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
counter++;
pw.println("At present the value of the counter is " + counter);
}
}
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The output of the program is given below:
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