Servlet Interface
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Servlet Interface
It is an interface to define a Servlet, the implementation class of this Servlet should override all methods of Servlet interface.
Servlet interface needs to be implemented for creating any Servlet (either directly or indirectly). It provides 3 life cycle methods that are used to initialize the Servlet, to service the requests, and to destroy the Servlet and 2 non-life cycle methods.
Methods of Servlet interface
| Method | Description |
|---|---|
| public void init(ServletConfig config) | initializes the Servlet. It is the life cycle method of Servlet and invoked by the web container only once. |
| public void service(ServletRequest request,ServletResponse response) | provides response for the incoming request. It is invoked at each request by the web container. |
| public void destroy() | is invoked only once and indicates that Servlet is being destroyed. |
| public ServletConfig getServletConfig() | returns the object of ServletConfig. |
| public String getServletInfo() | returns information about Servlet such as writer, copyright, version etc. |
Example of servlet by implementing Servlet interface
Syntax
public class myServlet implements server
{
....
}
public void destroy()
{
.....
}
public void init(ServletConfig se)
{
.....
}
public ServletConfig getServletConfig()
{
.....
}
public String getServiceInfo()
{
....
}
public void service(ServletRequest req, ServletResponse resp)throws IOException, ServletException
{
....
}
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