Question

I am making a web service which is REST based.

First i wants to see url like as follows

 /{resource}
 /{resource}/<id>
 /{resource1}/<id>/{resource2}
 /{resource1}/<id>/{resource2}/<id>

How to make servlet urls as above..?
I prefer not to use any framework.

Answer 1

Servlet API doesn’t provide any special support for this kind of mapping.

If you want to do it without third-party libraries, you need to map your servlet to /{resource}, get rest of the path as request.getPathInfo() and implement further routing based on that value:

<servlet-mapping>
    ...
    <url-pattern>/resource</url-pattern>
</servlet-mapping>

.

public class ResourceServlet extends HttpServlet {
    public void doGet(HttpServletRequest request, HttpServletResponse response) {
        String path = request.getPathInfo();
        if (path == null) { // It's /resource
            ...
        } else if (path.matches("/\\d+")) { // It's /resources/<id> with integer id
            ...
        }
    }
}

However, it would be better not to reinvent the wheel and use one of JAX-RS implementations.