spring自定义注解实现拦截器的实现方法

@LoginRequired 
@RequestMapping(value = "/comment") 
public void comment(HttpServletRequest req, HttpServletResponse res) { 
  // doSomething,,,,,,,, 
} 

import java.lang.annotation.ElementType; 
import java.lang.annotation.Retention; 
import java.lang.annotation.RetentionPolicy; 
import java.lang.annotation.Target; 
 
@Target(ElementType.METHOD) 
@Retention(RetentionPolicy.RUNTIME) 
public @interface LoginRequired { 
   
} 

  import javax.servlet.http.HttpServletRequest; 
  import org.aopalliance.intercept.MethodInterceptor; 
  import org.aopalliance.intercept.MethodInvocation; 
   
  public class LoginRequiredInterceptor1 implements MethodInterceptor { 
   
   
    @Override 
    public Object invoke(MethodInvocation mi) throws Throwable { 
         
      Object[] ars = mi.getArguments(); 
        
      for(Object o :ars){ 
        if(o instanceof HttpServletRequest){ 
          System.out.println("------------this is a HttpServletRequest Parameter------------ "); 
        } 
      } 
      // 判断该方法是否加了@LoginRequired 注解 
      if(mi.getMethod().isAnnotationPresent(LoginRequired.class)){ 
         System.out.println("----------this method is added @LoginRequired-------------------------"); 
      } 
      //执行被拦截的方法，切记，如果此方法不调用，则被拦截的方法不会被执行。 
      return mi.proceed(); 
    } 
  } 

  <bean id="springMethodInterceptor" class="com.qunar.wireless.ugc.interceptor.LoginRequiredInterceptor1" ></bean> 
  <aop:config> 
    <!--切入点--> 
     <aop:pointcut id="loginPoint" expression="execution(public * com.qunar.wireless.ugc.controllor.web.*.*(..)) "/>  
     <!--在该切入点使用自定义拦截器--> 
     <aop:advisor pointcut-ref="loginPoint" advice-ref="springMethodInterceptor"/> 
  </aop:config>