Handling HTTP methods

As mentioned earlier, each HTTP request uses a request method, which in most cases is one of GET, POST, PUT, and DELETE. In RESTful architectures, those HTTP methods are usually used to perform actions based on the following convention:

• GET: Request retrieval of an existing resource
• POST: Request creation of a new resource
• PUT: Request the updating of an existing resource, or create a new one if it does not exist
• DELETE: Request deletion of an existing resource

In JAX-RS, a corresponding annotation for each HTTP method exists @GET, @POST, @PUT, and @DELETE. In the Handling JSON section, we will create a complete CRUD example for a RESTful service that performs creation, retrieval, updating, and deletion actions using those methods.

For now, let's try to use each of these methods in a simple example:

@Path("/hello") 
public class FirstRest { 
 
    @GET 
    public String testGet() { 
        return "You have issues a get request!"; 
    } 
 
    @POST 
    public String testPost...