Spring 4：拦截时无法获取参数注解？

Question

我有这个方法：

@Override
public ClientDomain addClient(@Valid ClientDomain client) throws ValidationException {
    Client clientEntity = this.transformer.transform(client);
    Client clientEntityResponse = this.dao.save(clientEntity);
    return this.transformer.revert(clientEntityResponse);
}

为了拦截它，我使用了 Spring 4 AOP。这就是我所拥有的：

import java.lang.annotation.Annotation;
import java.util.Set;

import javax.validation.ConstraintViolation;
import javax.validation.Validator;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
public class ValidationInterceptor
    implements MethodInterceptor {

    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {
        System.out.println("Validating " + invocation.getMethod().getName() + " method");

        Object[] asd = invocation.getArguments(); // Get object arguments
        invocation.proceed();
        return null;
    }

}

所以，我想获取参数注释，在这种情况下，我希望收到@Valid 注释，但我找不到执行此操作的方法。我已经试过了

    for (int i = 0; i < asd.length; i++) {
        System.out.println("Param: " + asd[i].toString());

        Annotation[][] annotations = invocation.getMethod().getParameterAnnotations();
        for (Annotation annotation : annotations[i]) {
            System.out.println("---" + annotation.getClass().getSimpleName());
        }
    }

但是我在 getParametersAnnotations() 上收到一个空注释对象

你知道我该怎么做吗？

Answer 1

我需要一次从 RequestMapping 注释中提取值。我使用过 HandlerInterceptorAdapter。如果 Valid 注释在花括号中不包含任何参数，我不确定你想通过获取它来实现什么，但也许你可以调整这段代码：

@Component
public class YourNameOfInterceptor extends HandlerInterceptorAdapter {

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

    if (handler instanceof HandlerMethod) {
        String[] requestMappingValues = ((HandlerMethod) handler).getMethodAnnotation(RequestMapping.class).value();
        for (String value : requestMappingValues) {
                //you can get values from for example @RequestMapping("/abc") here        
        }
    }

    return true;
}

}

Spring 4：拦截时无法获取参数注解？

Spring 4: cannot get arguments annotations at interception?

java

spring

interceptor

aspect

spring-4