Webservice using Seam

Question

Hi

I am new to Seam and want to develop Webservice using Seam.I have an aggressive deadline Where i can find the details to develop the Webservice using Seam.Any good document, book, website etc.

Answer 1

As mentioned in the other question you could use JAX-WS. However if you'd rather use REST services (JAX-RS) then either:

• Read up on JAX-WS in the Seam Docs
• Check out Stéphane Épardaud's article here; or
• Have a look at Sun Jersey which is an implementation of JAX-RS.

EDIT: Norman Richards from the Seam team has just posted a blog article about Seam and JAX-RS. Looks fantastic and probably more what you are after than Jersey.

I had a look at Jersey last week and was amazed at how little code you need. Here's a little guide:

1. Download the Jersey Jars and the JAXB Jars (so you can output XML and/or JSON) and add them to your classpath
2. Add the Jersey servlet to your web.xml (in the example below with a url-pattern of service/*)
3. Annotate the Bean that holds your data with JAXB annotations
4. Create a Service class with the Jersey annotations.

Here's an example of a Service:

@Path("/users")
public class UsersService {
  @GET
  @Produces({MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML})
  public Users getUsers() {
    return UserQuery.getUsers();
  }
}

Where this is the Users class:

@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "users")
public class Users {
  @XmlElement(name="users")
  private List<User> users = new ArrayList<User>();

  public List<User> getUsers() {
    return this.users;
  }

  public void setUsers(List<User> users) {
    this.users = users;
  }
}

And this is the User class:

@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "user")
public class User implements Serializable {
  @XmlElement(name="id")
  private long userId;

  @XmlElement(name="firstName")
  private String firstName;

  @XmlElement(name="lastName")
  private String lastName;

  @XmlElement(name="email")
  private String email;

  public User() {}

  public User(long userId, String firstName, String lastName, String email) {
    this.userId = userId;
    this.firstName = firstName;
    this.lastName = lastName;
    this.email = email;
  }

  //And the getter/setters
}

Then you can access the service at http://yourhost/service/users It will produce XML or JSON depending on what your client has for it's HTTP Accepts header. Pretty cool huh?