Spring MVC多个拦截器执行顺序

为了对比多个拦截器的执行顺序，先创建两个拦截器打比方

第一个拦截器:

public class MyInterceptor implements HandlerInterceptor {
    /**
     * 目标方法执行之前执行
     *
     * @return true不拦截，如果为false，那么后面一连串方法都不会执行(Controller。postHandle。afterCompletion。。等等)
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
            System.out.println("preHandle1.....");
            return true;
    }

    /**
     * 在目标执行之后 视图返回之前执行
     */
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle1.....");
    }

    /**
     * 在整个流程都执行完毕后执行,记录日志、异常等(用的不多)
     */
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion1.....");
    }
}

第二个拦截器:

public class MyInterceptor2 implements HandlerInterceptor {
    /**
     * 目标方法执行之前执行
     *
     * @return true不拦截，如果为false，那么后面一连串方法都不会执行(Controller。postHandle。afterCompletion。。等等)
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("preHandle2.....");
        return true;
    }

    /**
     * 在目标执行之后 视图返回之前执行
     */
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle2.....");
    }

    /**
     * 在整个流程都执行完毕后执行,记录日志、异常等(用的不多)
     */
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion2.....");
    }
}

Spring MVC配置文件中配置拦截器:先配置拦截器1，再配置拦截器2

启动Tomcat服务并访问相应资源，运行结果:

 调换SpringMVC配置文件拦截器的顺序:先配置拦截器2，再配置拦截器1

再次运行Tomcat服务执行结果:

preHandle2.....
preHandle1.....
postHandle1.....
postHandle2.....
afterCompletion1.....
afterCompletion2.....

多个拦截器执行preHandle的顺序与Spring MVC配置文件中的配置顺序有关,将配置文件还原到拦截器1~拦截器2

当第一个拦截器的preHandle方法返回true时，才会继续向下调用下一个拦截器的preHandle

修改一下代码，将第一个拦截器的preHandle方法改成false，试着运行程序，看看拦截器2的preHandle是否执行:

public class MyInterceptor implements HandlerInterceptor {
    /**
     * 目标方法执行之前执行
     *
     * @return true不拦截，如果为false，那么后面一连串方法都不会执行(Controller。postHandle。afterCompletion。。等等)
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
            System.out.println("preHandle1.....");
            return false;
    }

    /**
     * 在目标执行之后 视图返回之前执行
     */
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle1.....");
    }

    /**
     * 在整个流程都执行完毕后执行,记录日志、异常等(用的不多)
     */
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion1.....");
    }
}

执行结果:

只有preHandle1被执行 ，说明拦截器1的preHandle返回false拦截器2压根就不会执行，甚至拦截器1的postHandle和afterCompletion也不会执行