Springboot2.x 拦截器

一，单个拦截器，实现接口  HandlerInterceptor

@Component
public class MyInterceptor1 implements HandlerInterceptor {

    /**
     * 进入controller层之前拦截请求
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("============1111111111---preHandle============");
        return true;
    }

    /**
     * 处理请求完成后视图渲染之前的处理操作
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable ModelAndView modelAndView) throws Exception {
        System.out.println("============1111111111---postHandle ============");
    }
    /**
     * 视图渲染之后的操作
     * @param request
     * @param response
     * @param handler
     * @param ex
     * @throws Exception
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable Exception ex) throws Exception {
        System.out.println("============1111111111---afterCompletion============");
    }

}

　　新建类  InterceptorConfig 实现 WebMvcConfigurer

@Configuration
public class InterceptorConfig implements WebMvcConfigurer {

    @Resource
    private MyInterceptor1 myInterceptor1;
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //添加要拦截的url                                拦截的路径                                    放行的路径
        registry.addInterceptor(myInterceptor1).addPathPatterns("/admin/**").excludePathPatterns("/admin/login");
    }
}

　

二 ，多个拦截器

咱建个拦截器 2

@Component
public class MyInterceptor2 implements HandlerInterceptor {

    /**
     * 进入controller层之前拦截请求
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        System.out.println("============2222222---preHandle============");

        return true;
    }

    /**
     * 处理请求完成后视图渲染之前的处理操作
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable ModelAndView modelAndView) throws Exception {
        System.out.println("============2222222---postHandle ============");
    }

    /**
     * 视图渲染之后的操作
     * @param request
     * @param response
     * @param handler
     * @param ex
     * @throws Exception
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable Exception ex) throws Exception {
        System.out.println("============2222222---afterCompletion============");
    }

}

　　

然后在 InterceptorConfig 添加配置

@Configuration
public class InterceptorConfig implements WebMvcConfigurer {

    @Resource
    private MyInterceptor1 myInterceptor1;
    @Resource
    private MyInterceptor2 myInterceptor2;
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //添加要拦截的url               1                 拦截的路径                                    放行的路径
        registry.addInterceptor(myInterceptor1).addPathPatterns("/admin/**").excludePathPatterns("/admin/login");
        //添加要拦截的url                2
        registry.addInterceptor(myInterceptor2).addPathPatterns("/admin/**").excludePathPatterns("/admin/login");
    }
}

　　现在看看两个拦截器执行顺序

现在把 拦截器1和2的位置换下

@Configuration
public class InterceptorConfig implements WebMvcConfigurer {

    @Resource
    private MyInterceptor1 myInterceptor1;
    @Resource
    private MyInterceptor2 myInterceptor2;
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //添加要拦截的url                2
        registry.addInterceptor(myInterceptor2).addPathPatterns("/admin/**").excludePathPatterns("/admin/login");
        //添加要拦截的url               1                 拦截的路径                                    放行的路径
        registry.addInterceptor(myInterceptor1).addPathPatterns("/admin/**").excludePathPatterns("/admin/login");

    }
}

　　然后顺序就变了，日志如下

完了。