There are three approaches to develop a servlet programe,those are listed bellow
approach -1
Take a java class that implementing javax.servlet.Servlet(Interface) and provide implementation to all five methods of that interface
approach -2
Take a java class extending from javax.servlet.GenericServlet(class) and provide implementation to public void service(-,-) method
approach -3
Take a java class extending from javax.servlet.http.HttpServlet(class) and override one of the two service(-,-) method and one of the seven doXXX(-,-) method
all web servers are designed based on the protocol http,so it is recomended to use approach3
approach -1
Take a java class that implementing javax.servlet.Servlet(Interface) and provide implementation to all five methods of that interface
approach -2
Take a java class extending from javax.servlet.GenericServlet(class) and provide implementation to public void service(-,-) method
approach -3
Take a java class extending from javax.servlet.http.HttpServlet(class) and override one of the two service(-,-) method and one of the seven doXXX(-,-) method
all web servers are designed based on the protocol http,so it is recomended to use approach3
