Java Reference
In-Depth Information
Build and Run the Example Program
Perform the following steps:
1. Open a command prompt or shell terminal and change to the
ex06_1
directory of the
workbook example code.
2. Make sure your PATH is set up to include both the JDK and Maven, as described in
3. Perform the build and run the example by typing
maven install
.
Example ex06_2: Creating a Content Handler
For this example, we're going to create something entirely new. The
Chapter 6
example of a
content handler is a reimplementation of JAXB support. It is suitable for that chapter because
it illustrates both the writing of a
MessageBodyReader
and a
MessageBodyWriter
and
demonstrates how the
ContextResolver
is used. For
ex06_2
, though, we're going to keep
things simple.
In
ex06_2
, we're going to rewrite
ex06_1
to exchange Java objects between the client and
server instead of XML. Java objects, you ask? Isn't this REST? Well, there's no reason a
Java object can't be a valid representation of a resource! If you're exchanging Java objects,
you can still realize a lot of the advantages of REST and HTTP. You still can do content ne-
gotiation (described in
Chapter 9
)
and HTTP caching (described in
Chapter 11
)
.
The Content Handler Code
For our Java object content handler, we're going to write one class that is both a
Mes-
sageBodyReader
and a
MessageBodyWriter
:
src/main/java/com/restfully/shop/services/JavaMarshaller.java
@Provider
@Produces
(
"application/example-java"
)
@Consumes
(
"application/x-java-serialized-object"
)
public
public class
class
JavaMarshaller
JavaMarshaller
implements
implements
MessageBodyReader
,
MessageBodyWriter
{
The
JavaMarshaller
class is annotated with
@Provider
,
@Produces
, and
@Consumes
, as re-
quired by the specification. The media type used by the example to represent a Java object is
