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Tip of the Day
Language: Java
Expertise: Advanced
Mar 29, 2005

Make Your Servlet Code Reusable

Oftentimes, you have a bit of logic or a block of code that's repeated in all your servlets. Or you may need to check or validate the doGet() or doPost() methods before you execute either.

An efficient way to do this is to implement your logic in the service() method:

  1. Write a common servlet:
    
    public class CommonServlet extends HttpServlet{
        // Common service that will be triggered for every request.  
        protected void service(HttpServletRequest request, HttpServletResponse response) throws
    ServletException, IOException {
        //
        // implement any common logic here. Eg. Check whether session has some values or not. Or check
    whether user type etc. You can even add authorization logic here.
    
    
    }    
    
    }
    
  2. Extend all your servlets from the common servlet:
    
    public class MyBusinessServlet extends CommonServlet{
    
     public void doPost(HttpServletRequest request, HttpServletResponse response) throws
    ServletException, IOException {
    // Your code.. 
          }
    
    
     public void doGet(HttpServletRequest request, HttpServletResponse response) throws
    ServletException, IOException {
    // Your code.. 
          }
    
    } 
    
Both doGet() or doPost() will now automatically call CommonServlet's service() method before the doXXX method is executed—as per Servlet specification.
M. Sarath Babu
 
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