如何获取spring mvc中的拦截器的bean

举个例子Test2Interceptor要获取TestInterceptor来操作

<mvc:interceptors>
	<mvc:interceptor>
		<mvc:mapping path="/**"/>
		<bean class="com.xxx.TestInterceptor">	
		</bean>
	</mvc:interceptor>
        <mvc:interceptor>
		<mvc:mapping path="/**"/>
		<bean class="com.xxx.Test2Interceptor">		
		</bean>
	</mvc:interceptor>
</mvc:interceptors>

public class TestInterceptor implements HandlerInterceptor {

}

public class Test2Interceptor implements HandlerInterceptor,ApplicationContextAware {
        private ApplicationContext applicationContext;
        public boolean preHandle(HttpServletRequest request,
			HttpServletResponse response, Object object) throws Exception {
Map<String,MappedInterceptor> map = applicationContext.getBeansOfType(MappedInterceptor.class);
		for(MappedInterceptor m : map.values()) {
			if(m.getInterceptor() instanceof TestInterceptor) {
				System.out.println(m.getInterceptor());
			}
		}
        }
       public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
		this.applicationContext = applicationContext;
		
	}
}

得出原来spring mvc把<mvc:interceptors>配置的bean放到MappedInterceptor实例中
咱们看下MappedInterceptor源码

public final class MappedInterceptor {

	private final String[] includePatterns;

	private final String[] excludePatterns;

	private final HandlerInterceptor interceptor;
//省略
}

这里得出MappedInterceptor 持有HandlerInterceptor实例对象，HandlerInterceptor也就是我们刚刚写的拦截器的要实践的接口。
这样我们就明白了，大功告成。