HandlerInterceptor的使用

HandlerInterceptor顾名思义：handler拦截器。
在Controller被调用前使用
案例：

<bean id="handleMappingInterceptor" class="com.ainoties.core.mvc.interceptor.HandleMappingInterceptor"></bean>
<!-- HandlerMapping -->
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping ">
<property name="interceptors">
<list>
<ref bean="handleMappingInterceptor"/>
</list>
</property>
</bean>

BeanNameUrlHandleMapping同样支持，似乎与BeanNameUrlHandlerMapping共同使用，更有味道。
HandlerInterceptor应该实现接口：HandlerInterceptor
org.springframework.web.servlet.HandlerInterceptor

实现类

public class HandleMappingInterceptor extends HandlerInterceptorAdapter{
/**
* This implementation always returns {@code true}.
*/
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
System.out.println("preHandle---->execute");
return super.preHandle(request, response, handler);
}
/**
* This implementation is empty.
*/
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView)throws Exception {
System.out.println("postHandle--->execute");
}
/**
* This implementation is empty.
*/
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)throws Exception {
System.out.println("afterCompletion--->");
}
/**
* This implementation is empty.
*/
@Override
public void afterConcurrentHandlingStarted(HttpServletRequest request, HttpServletResponse response, Object handler)throws Exception {
System.out.println("afterConcurrentHandlingStarted--->");
}
}

执行顺序：

preHandle---->execute
HomeHandler.home-->execute!//Controller中的方法，也就是我们的控制层
postHandle--->execute
afterCompletion--->

HandlerInterceptor接口方法
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler);
方法说明：返回true,执行链继续执行，返回false，则不再执行。则后续的Interceptor、Controller等不再执行。

最后

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