SpringBoot17 之Interceptor

实现自定义拦截器只须要3步： 

一、建立咱们本身的拦截器类并实现 HandlerInterceptor 接口。 

二、建立一个Java类继承WebMvcConfigurerAdapter，并重写 addInterceptors 方法。 

二、实例化咱们自定义的拦截器，而后将对像手动添加到拦截器链中（在addInterceptors方法中添加）

public class MyInterceptor1 implements HandlerInterceptor { 

    @Override

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

            throws Exception {

        System.out.println(">>>MyInterceptor1>>>>>>>在请求处理以前进行调用（Controller方法调用以前）"); 

        return true;// 只有返回true才会继续向下执行，返回false取消当前请求

    }

    @Override

    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,

            ModelAndView modelAndView) throws Exception {

        System.out.println(">>>MyInterceptor1>>>>>>>请求处理以后进行调用，可是在视图被渲染以前（Controller方法调用以后）");

    }

    @Override

    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)

            throws Exception {

        System.out.println(">>>MyInterceptor1>>>>>>>在整个请求结束以后被调用，也就是在DispatcherServlet 渲染了对应的视图以后执行（主要是用于进行资源清理工做）");

    }

 }

public class MyInterceptor2 implements HandlerInterceptor {

    @Override

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

            throws Exception {

        System.out.println(">>>MyInterceptor2>>>>>>>在请求处理以前进行调用（Controller方法调用以前）");

        return true;// 只有返回true才会继续向下执行，返回false取消当前请求

    }

 

    @Override

    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,

            ModelAndView modelAndView) throws Exception {

        System.out.println(">>>MyInterceptor2>>>>>>>请求处理以后进行调用，可是在视图被渲染以前（Controller方法调用以后）");

    } 

    @Override

    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)

            throws Exception {

        System.out.println(">>>MyInterceptor2>>>>>>>在整个请求结束以后被调用，也就是在DispatcherServlet 渲染了对应的视图以后执行（主要是用于进行资源清理工做）");

    }

}

@Configuration

public class MyWebAppConfigurer extends WebMvcConfigurerAdapter {

@Override

public void addInterceptors(InterceptorRegistry registry) {

// 多个拦截器组成一个拦截器链

// addPathPatterns 用于添加拦截规则

// excludePathPatterns 用户排除拦截

registry.addInterceptor(new MyInterceptor1()).addPathPatterns("/**");

registry.addInterceptor(new MyInterceptor2()).addPathPatterns("/**");

super.addInterceptors(registry);

}

}