- Turn JSON support on in your servlet's web.xml:
<init-param> <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name> <param-value>true</param-value> </init-param>
- This example also uses compression so add the gzip filters too.
- Annotate your POJO with JAXB. Make sure you have an empty constructor. I like to make the member variables private and force use of public getters. I also elect to ignore unknown properties.
@XmlRootElement(name = "foo") @XmlAccessorType(XmlAccessType.PUBLIC_METHOD) @JsonIgnoreProperties(ignoreUnknown = true) public class Foo { private String blah; Foo() {}
@XmlElement()
public String getBlah() { return blah; }
}
- Set up your web service. Since you're returning JSON, jQuery will be happy with basically no further consideration. Note I didn't define a setBlah() above but I hope you get the picture.
@GET @Path("/") @Produces({MediaType.APPLICATION_JSON}) public Foo getFoo() { Foo foo = new Foo(); foo.setBlah("Hello!"); return foo; }
- Connect your WebResource properly. Note the addition of the JacksonJsonProvider class. The gzip filter is not required but you should probably use it.
ClientConfig config = new DefaultClientConfig(); config.getClasses().add(JacksonJsonProvider.class); Client client = Client.create(config); client.addFilter(new GZIPContentEncodingFilter(true)); WebResource webResource = client.resource(hostname);
- Now request your POJO response (note the use of gzip here):
Foo foo = webResource.path("/") .header("Accept-Encoding", "gzip") .get(new GenericType<Foo>() {});
- You can also pass POJOs to the web service using POSTs. This snippet assumes you annotated class Bar is a similar manner to Foo and the "/bar" POST endpoint accepts a Bar object.
Bar bar = new Bar("stuff"); Foo foo = webResource.path("/bar").post(new GenericType<Foo>() {}, bar);
Edited on 2/10/13 to include compression in example.
