java - 如何获取自定义注释的@PathVariable值？

Question

我有一个 Controller :

@Authorised(id = "{personId}")
@RequestMapping(value = {"{personId}"}, method = GET)
public void test(@PathVariable PersonId personId) {
    System.out.println(personId); //gets personId
}

注释:

@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Authorised {
    String id() default "";
}

切入点:

@Pointcut("@annotation(Authorised)")
private void AuthorisedMethod() {}

必须获取 {personId} 值而不是字符串“{personId}”的方法:

@Before("AuthorisedMethod()")
public void checkIfIsCurrentlyAuthenticated(JoinPoint joinPoint) throws NoSuchMethodException {
    MethodSignature signature = (MethodSignature) joinPoint.getSignature();
    String methodName = signature.getMethod().getName();
    Class<?>[] parameterTypes = signature.getMethod().getParameterTypes();
    Parameter[] parameters = signature.getMethod().getParameters();
    Authorised annotations = joinPoint.getTarget().getClass().getMethod(methodName, parameterTypes).getAnnotation(Authorised.class);
    String id = annotations.id();
    System.out.println(id); // prints: "{personId}"
    // do the chekcing
    throw new UnauthenticatedUserException();
}

能否实现以及如何实现？

更新:但是如果方法参数参数编号与切入点 args() 不匹配怎么办？我的意思是，如果特定方法具有参数 @PathVariable PersonId personId 以及更多参数，但 pointcut 只需要知道 PersonId personId 会怎么样？

就像@statut说的，你必须这样写args():args(personId,..)

Answer 1

例如，您可以修改 @Before() 注释以具有 PersonId 值并将该值传递给方面

@Before("AuthorisedMethod() && args(personId)")
public void checkIfIsCurrentlyAuthenticated(JoinPoint joinPoint, PersonId personId) throws NoSuchMethodException {}

为了测试它，我有以下方面:

@Aspect
@Component
public class SomeAspect {

    @Pointcut("@annotation(Authorised)")
    private void AuthorisedMethod() {
    }

    @Before("AuthorisedMethod() && args(personId)")
    public void checkIfIsCurrentlyAuthenticated(JoinPoint joinPoint, PersonId personId) throws NoSuchMethodException {
        System.out.println("aspect " + personId.getId());
    }

}

配置类:

@Configuration
@ComponentScan(basePackages = {"test"})
@EnableAspectJAutoProxy(proxyTargetClass = true)
public class Config {
}

测试组件:

@Component
public class Test {

    @Authorised(id = "{personId}")
    public void test(PersonId personId) {
        System.out.println("component " + personId.getId()); //gets personId
    }
}

以及 testNG 的运行程序:

@ContextConfiguration(classes = Config.class)
public class TestRunner extends AbstractTestNGSpringContextTests {

    @Autowired
    test.Test test;

    @Test
    public void testName() {
        test.test(new PersonId("id"));
    }

}

当我运行它时，我会从方面打印“aspect id”，并从调用的方法打印“component id”。