@Path("resource_path"):
The @Path annotation defines the path to the base URL or resource_path. The base URL is based on the application's name, the servlet, and the URL pattern from the web.xml configuration file.
@PathParam:
The @PathParam annotation is used to inject values from the URL into a method parameter. In this way, one can inject, say, the ID of a resource into the method for getting the correct object.
@GET:
The @GET annotation indicates that the method will answer to an HTTP GET request.
@PUT:
The @PUT annotation indicates that the method will answer to an HTTP PUT request.
@POST:
The @POST annotation indicates that the method will answer to an HTTP POST request.
@DELETE:
The @DELETE annotation indicates that the method will answer to an HTTP DELETE request.
@Produces(MediaType.TEXT_PLAIN):
The @Produces annotation defines which MIME type is delivered by a method annotated with any HTTP annotated methods. In the given example, a text (text/plain) is produced. Other examples would be application/xml or application/json.
@Consumes(type):
The @Consumes annotation defines which MIME type is consumed by this method.