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。