RESTful Web Services First Application with Eclipse & Tomcat

Pubblicato il: 23 aprile 2019
sul canale di: JavaEE Tips

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JAX-RS: Java API for RESTful Web Services (JAX-RS) is a Java programming language API spec that provides support in creating web services according to the Representational State Transfer (REST) architectural pattern. JAX-RS uses annotations, introduced in Java SE 5, to simplify the development and deployment of web service clients and endpoints.

From version 1.1 on, JAX-RS is an official part of Java EE 6. A notable feature of being an official part of Java EE is that no configuration is necessary to start using JAX-RS. For non-Java EE 6 environments a small entry in the web.xml deployment descriptor is required.

Specification
JAX-RS provides some annotations to aid in mapping a resource class (a POJO) as a web resource. The annotations use the Java package javax.ws.rs. They include:

@Path specifies the relative path for a resource class or method.
@GET, @PUT, @POST, @DELETE and @HEAD specify the HTTP request type of a resource.
@Produces specifies the response Internet media types (used for content negotiation).
@Consumes specifies the accepted request Internet media types.
In addition, it provides further annotations to method parameters to pull information out of the request. All the @*Param annotations take a key of some form which is used to look up the value required.

@PathParam binds the method parameter to a path segment.
@QueryParam binds the method parameter to the value of an HTTP query parameter.
@MatrixParam binds the method parameter to the value of an HTTP matrix parameter.
@HeaderParam binds the method parameter to an HTTP header value.
@CookieParam binds the method parameter to a cookie value.
@FormParam binds the method parameter to a form value.
@DefaultValue specifies a default value for the above bindings when the key is not found.
@Context returns the entire context of the object (for example @Context HttpServletRequest request).

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