yes why not.it's possible to write service(),doGet(),doPost()methods in single servlet.
     Incase of  service() method,doGet()Method if we have got request as a POST then the service()method will be executed.

yes why not.it's possible to write service(),doGet(),doPost()methods in single servlet.
     Incase of doGet()Method if we have got request as a POST then the service()method will be executed.

yes why not.it's possible to write service(),doGet(),doPost()methods in single servlet.but, 
      where as doGet()Method if we have got request as a POST it's not accepted & give Exceptions.

Yeah. You can write all the methods in a single servlet.

As for doGet/doPost, just define any one of them and call this function from the other one. 

For e.g

void doGet(HttpServletRequest rq, HttpServletResponse rs) throws ...
{
doPost(rq,rs);
}

void doPost(HttpServletRequest rq, HttpServletResponse rs) throws ...
{
//Get the work done here
}

Regards
Vishal

You should not override service() method.
If your request is POST, then you need only to override doPost() method.

service() method must is already implemented in the HTTP servlet. It contains the logic which dispatches the HTTP request to appropriate method - either doPost() or doGet() for HTTP POST resp. HTTP GET.

Good practice is to call doPost() method from the doGet() body or print that doGet() is not supported.

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Cheers,
Milan