springmvc拦截器和拦截器执行顺序

springmvc拦截器和拦截器执行顺序

HandlerInterceptor和HandlerInterceptorAdapter
HandlerInterceptor接口，子类实现后要实现接口中所有方法。
HandlerInterceptorAdapter抽象类，子类继承后重写需要使用到的方法即可。

自定义拦截器执行顺序

自定义拦截器FirstInterceptor：

public class FirstInterceptor implements HandlerInterceptor {    @Override    public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)            throws Exception {        System.out.println("FirstInterceptor.afterCompletion()");    }    @Override    public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)            throws Exception {        System.out.println("FirstInterceptor.postHandle()");    }    @Override    public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2) throws Exception {        System.out.println("FirstInterceptor.preHandle()");        return true;    }}

自定义拦截器SecondInterceptor

public class SecondInterceptor implements HandlerInterceptor {    @Override    public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)            throws Exception {        System.out.println("SecondInterceptor.afterCompletion()");    }    @Override    public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)            throws Exception {        System.out.println("SecondInterceptor.postHandle()");    }    @Override    public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2) throws Exception {        System.out.println("SecondInterceptor.preHandle()");        return true;    }}

springmvc配置文件的配置如下：

    <mvc:interceptors>        <bean class="com.springmvc.intercepter.FirstInterceptor" />        <bean class="com.springmvc.intercepter.SecondInterceptor" />    </mvc:interceptors>

执行顺序：

FirstInterceptor.preHandle()SecondInterceptor.preHandle()SecondInterceptor.postHandle()FirstInterceptor.postHandle()SecondInterceptor.afterCompletion()FirstInterceptor.afterCompletion()

自定义拦截器抛出异常的执行处理

1. FirstInterceptor方法preHandle抛异常

FirstInterceptor.preHandle()七月 06, 2017 9:48:33 上午 org.apache.catalina.core.StandardWrapperValve invoke严重: Servlet.service() for servlet [springDispatcherServlet] in context with path [/springmvc] threw exception [Request processing failed; nested exception is java.lang.Exception] with root causejava.lang.Exception

以上，
FirstInterceptor.preHandle()执行抛异常
->SecondInterceptor.preHandle()不执行
->SecondInterceptor.postHandle()不执行
->FirstInterceptor.postHandle()不执行
->SecondInterceptor.afterCompletion()不执行
->FirstInterceptor.afterCompletion()不执行

1. SecondInterceptor方法preHandle抛异常

FirstInterceptor.preHandle()SecondInterceptor.preHandle()FirstInterceptor.afterCompletion()七月 06, 2017 9:51:45 上午 org.apache.catalina.core.StandardWrapperValve invoke严重: Servlet.service() for servlet [springDispatcherServlet] in context with path [/springmvc] threw exception [Request processing failed; nested exception is java.lang.Exception] with root causejava.lang.Exception

以上，
FirstInterceptor.preHandle()执行
->SecondInterceptor.preHandle()执行抛异常
->SecondInterceptor.postHandle()不执行
->FirstInterceptor.postHandle()不执行
->SecondInterceptor.afterCompletion()不执行
->FirstInterceptor.afterCompletion()执行

1. FirstInterceptor方法postHandle抛异常

FirstInterceptor.preHandle()SecondInterceptor.preHandle()SecondInterceptor.postHandle()FirstInterceptor.postHandle()SecondInterceptor.afterCompletion()FirstInterceptor.afterCompletion()七月 06, 2017 10:05:56 上午 org.apache.catalina.core.StandardWrapperValve invoke严重: Servlet.service() for servlet [springDispatcherServlet] in context with path [/springmvc] threw exception [Request processing failed; nested exception is java.lang.Exception] with root causejava.lang.Exception

FirstInterceptor.preHandle()执行
->SecondInterceptor.preHandle()执行
->SecondInterceptor.postHandle()执行
->FirstInterceptor.postHandle()执行抛异常
->SecondInterceptor.afterCompletion()执行
->FirstInterceptor.afterCompletion()执行

1. SecondInterceptor方法postHandle抛异常

FirstInterceptor.preHandle()SecondInterceptor.preHandle()SecondInterceptor.postHandle()SecondInterceptor.afterCompletion()FirstInterceptor.afterCompletion()七月 06, 2017 10:00:10 上午 org.apache.catalina.core.StandardWrapperValve invoke严重: Servlet.service() for servlet [springDispatcherServlet] in context with path [/springmvc] threw exception [Request processing failed; nested exception is java.lang.Exception] with root causejava.lang.Exception

FirstInterceptor.preHandle()执行
->SecondInterceptor.preHandle()执行
->SecondInterceptor.postHandle()执行抛异常
->FirstInterceptor.postHandle()不执行
->SecondInterceptor.afterCompletion()执行
->FirstInterceptor.afterCompletion()执行