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Arun Gupta is a technology enthusiast, a passionate runner, and a community guy who works for Sun Microsystems.

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Monday December 01, 2008

TOTD #58: Jersey and GlassFish - how to process POST requests ?

Lets extend the Jersey endpoint (TOTD# 56) and client (TOTD# 57) such that it can accept a POST request and then invoke it.

Add a new method to "MyResource.java" from TOTD# 56 as:

    @POST
    @Consumes("application/json")
    @Produces("application/json")
    public Greeting postIt(Greeting greeting) {
        System.out.println("In POST: " + greeting.greeting);
        return greeting;
    }

The first line indicates that the Java method will process HTTP POST requests. The second and third line shows that the method consumes and produces JSON data format.

Add a new method to "AppTest.java" from TOTD# 57 as:

    public void testPost() {
        Greeting result = createResource().
                type("application/json").
                post(Greeting.class, new Greeting("yo!"));
        assertTrue(result.greeting.equals("yo!"));
    }

The main difference from the "testApp()" method is specifying the MIME type of the generated outbound request as "application/json".

Running the test as "mvn test" shows the following output:

Running org.glassfish.samples.AppTest
1 * Out-bound request
1 > GET http://localhost:8080/helloworld-webapp/webresources/myresource
1 >
1 < 200
1 < X-Powered-By: Servlet/2.5
1 < Transfer-Encoding: chunked
1 < Content-Type: text/plain
1 < Server: GlassFish/v3
1 < Date: Tue, 25 Nov 2008 20:19:34 GMT
1 <
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><greeting><greeting>Hi there!</greeting></greeting>
1 * In-bound response
1 * Out-bound request
1 > POST http://localhost:8080/helloworld-webapp/webresources/myresource
1 > Content-Type: application/json
1 >
{"greeting":"yo!"}
1 < 200
1 < X-Powered-By: Servlet/2.5
1 < Transfer-Encoding: chunked
1 < Content-Type: application/json
1 < Server: GlassFish/v3
1 < Date: Tue, 25 Nov 2008 20:19:34 GMT
1 <
{"greeting":"yo!"}
1 * In-bound response
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.191 sec

The output shows request/response messages when both the tests are run together. Here are some highlights:

"GET" and "POST" methods are clearly highlighted.
The two "Content-Type" headers with value "text/plain" and "application/json" are output from two tests. The output from POST method has two Content-Type headers, one for outbound request and another one for inbound response.
The body content of POST method is using JSON format.

Jersey and GlassFish provides a complete server-side and client-side API and framework for deploying and invoking RESTful Web service endpoints.

How are you using Jersey ?

Send all your questions to users@jersey.dev.java.net.

Please leave suggestions on other TOTD (Tip Of The Day) that you'd like to see. An archive of all the tips is available here.

Technorati: totd glassfish v3 embeddable jersey jsr311 rest json webservices

Posted by Arun Gupta in webservices | Comments[6]