Jersey REST扩展方法 [英] Jersey REST extending methods
问题描述
我想知道是否可以使用泽西宁静资源执行以下技巧:
I was wondering if it is possible to do the following trick with jersey restful resources:
我有一个示例泽西资源:
I have an example jersey resource:
@Path("/example")
public class ExampleRessource {
@GET
@Path("/test")
@CustomPermissions({"foo","bar"})
public Response doStuff() {
//implicit call to checkPermissions(new String[] {"foo","bar"})
}
private void checkPermissions(String[] permissions) {
//stuff happens here
}
}
我想要实现的是:在执行每个资源之前通过调用checkPermissions方法隐式检查注释中的权限而不实际在方法体内编写调用的方法。有点装饰这个资源里面的每种球衣方法。
What I want to achieve is: before executing each resource's method to implicitly check the rights from the annotation by calling the checkPermissions method without actually writing the call inside the method body. Kind of "decorating" each jersey method inside this resource.
有优雅的解决方案吗?例如,使用球衣提供者?
Is there an elegant solution? For example with jersey Provider?
Thx!
推荐答案
使用泽西岛2可以使用 ContainerRequestFilter
。
With Jersey 2 can use ContainerRequestFilter
.
@Provider
public class CheckPermissionsRequestFilter
implements ContainerRequestFilter {
@Override
public void filter(ContainerRequestContext crc) throws IOException {
}
}
我们可以通过 ResourceInfo
class
We can get the annotation on the called method through the ResourceInfo
class
@Context
private ResourceInfo info;
@Override
public void filter(ContainerRequestContext crc) throws IOException {
Method method = info.getResourceMethod();
CheckPermissions annotation = method.getAnnotation(CheckPermissions.class);
if (annotation != null) {
String[] permissions = annotation.value();
}
}
您可以使用此批注
@NameBinding
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface CheckPermissions {
String[] value();
}
并使用注释资源类或资源方法@CheckPermissions({...})
- 见更多信息,请访问过滤器和拦截器
- See more at Filters and Interceptors
上面的注释允许注释类也。为了完整起见,你还要检查课程。类似
The annotation above allows for annotating classes also. Just for completeness, you'll want to check the class also. Something like
Class resourceClass = info.getResourceClass();
CheckPermissions checkPermissions = resourceClass.getAnnotation(CheckPermissions.class);
if (checkPermissions != null) {
String[] persmission = checkPermissions.value();
}
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