java 是否可以定义一个与其实现分离的 jax-rs 服务接口（使用 eclipse 和 jersey）？
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Is it possible to define a jax-rs service interface separated from its implementation (with eclipse and jersey)?
提问by dierre
I don't know if the title is confusing, but let's say I have this interface:
我不知道标题是否令人困惑，但假设我有这个界面：
@Produces(MediaType.APPLICATION_JSON)
@Path("/user")
public interface UserService {
@GET
@Path("/{userId}")
public Response getUser(@PathParam("userId") Long userId);
}
Why when I try to implement a version Eclipse rewrites annotation for the overridden method but not for the class?
为什么当我尝试实现某个版本时，Eclipse 会为重写的方法而不是为类重写注释？
class UserServiceImpl implements UserService {
@Override
@GET
@Path("/{userId}")
public Response getUser(@PathParam("userId") Long userId) {
// TODO Auto-generated method stub
return null;
}
}
I was trying to create a standard definition for the restful web service and then having different implementations. Is something like this possible with standard jax-rs? Am I using wrong annotations by any chance?
我试图为 restful web 服务创建一个标准定义，然后有不同的实现。使用标准的 jax-rs 可以实现这样的事情吗？我是否有机会使用错误的注释？
回答by Carlo Pellegrini
You can use annotation inheritance only if you don't use anyjax-rsannotation on the implementing class: it is stated on section 3.6 of JSR-339.
只有在实现类上不使用任何jax-rs注解时，才能使用注解继承：在 JSR-339 的第 3.6 节中有说明。
You redefine @Pathand @Producesfor the method but not for the class.
您重新定义 @Path和@Produces为方法而不是为类。
So the Pathannotation in your code should be on the concrete class:
所以Path你的代码中的注解应该在具体的类上：
public interface UserService {
@GET
@Path("/{userId}")
@Produces(MediaType.APPLICATION_JSON)
public Response getUser(@PathParam("userId") Long userId);
}
@Path("/user")
class UserServiceImpl implements UserService {
@Override
@GET
@Path("/{userId}")
@Produces(MediaType.APPLICATION_JSON)
public Response getUser(@PathParam("userId") Long userId) {
// TODO Auto-generated method stub
return null;
}
}
BTW, the specification encourages us to replicate the annotations on the concrete classes:
顺便说一句，规范鼓励我们在具体类上复制注释：
For consistency with other Java EE specifications, it is recommended to always repeat annotations instead of relying on annotation inheritance.
为了与其他 Java EE 规范保持一致，建议始终重复注解，而不是依赖注解继承。
