springmvc 开涛 拦截器

拦截器有三个方法：preHandle, postHandle, afterCompletion

***-servlet.xml

<bean name="/test" class="cn.javass.chapter5.web.controller.TestController"/>

<bean id="handlerInterceptor1"

class="cn.javass.chapter5.web.interceptor.HandlerInterceptor1"/>

<bean id="handlerInterceptor2"

class="cn.javass.chapter5.web.interceptor.HandlerInterceptor2"/>

//是HandlerMapping接口的实现类

<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping">

    <property name="interceptors">

        <list>

           <ref bean="handlerInterceptor1"/>

          <ref bean="handlerInterceptor2"/>

        </list>

    </property>

</bean>

中断流程

@Override

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

    System.out.println("===========HandlerInterceptor1 preHandle");

　　 response.getWriter().print("break");//流程中断的话需要我们进行响应的处理

    return false;//返回false表示流程中断

}

性能监控，登陆检测 具体细节不太清楚。