如何通过基于Java的Web服务在现有数据模型上轻松公开CRUD操作？

Question

I have an existing domain model annotated with JPA annotations that I would like to easily expose CRUD operations on via Web Services. I already have DAOs to perform CRUD operations on all of my entities in my domain.

Does anyone know of an way to do this that does not involve a tremendous amount of effort?

Answer 1

It depends on how my operations and services and what you call "a tremendous amount of effort." You're likely to be disappointed if doing anything more than pushing a button and having your wishes come true is too much.

But there are three parts to your problem:

1. Writing DAOs that expose the CRUD operations. I'd recommend an interface-based approach.
2. Exposing these as "contract-first" web services, either SOAP or REST.
3. Mapping HTTP requests and responses to your API.

I'd recommend Spring, because it'll help with DAOs, web services, and mapping. But I don't know if it'll be as effortless as you want it to be.

Answer 2

You can use Apache CXF in combination with Spring ROO to achieve this.

Please see this post for more details: http://forum.springsource.org/showpost.php?p=284028&postcount=4

Answer 3

Throw some annotations on that DAO, like @WebService and @WebMethod and use your JAX-WS implementation of choice. You can use JAX-WS Commons Spring for Spring integration.