springboot拦截器使用 2.x

浅浅的花香味﹌ 2022-03-12 10:24 191阅读 0赞

### 首先创建一个springboot项目，放文路径返回一下信息。 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyNDQ4MzQ5_size_16_color_FFFFFF_t_70][]

### 1.写一个拦截器MyInterceptor  ###

import org.springframework.context.annotation.Configuration;
    import org.springframework.web.servlet.HandlerInterceptor;
    import org.springframework.web.servlet.ModelAndView;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
     
    @Configuration
    public class MyInterceptor implements HandlerInterceptor {
    
    
        /*
         * 进入controller层之前拦截请求
         */
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
            String token = request.getHeader("token");
            if (token == null) {
                return true;
            } else {
                System.out.println(token);
                return false;
            }
    
        }
    
        /*
         * 处理请求完成后视图渲染之前的处理操作
         */
        @Override
        public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
    
        }
    
        /*
         * 视图渲染之后的操作
         */
        @Override
        public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
    
        }
    }

## 2.写个webmvc配置类MyWebMvcConfig  ##

import org.springframework.context.annotation.Configuration;
    import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
    import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
     
    @Configuration
    public class MyWebMvcConfig implements WebMvcConfigurer {
        @Override
        public void addInterceptors(InterceptorRegistry registry) {
            registry.addInterceptor(new MyInterceptor()).addPathPatterns("/**").excludePathPatterns("/login");
        }
    
        @Override
        public void addResourceHandlers(ResourceHandlerRegistry registry) {
    
        }
    }

### 测试,项目运行，已被拦截 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyNDQ4MzQ5_size_16_color_FFFFFF_t_70 1][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyNDQ4MzQ5_size_16_color_FFFFFF_t_70]: /images/20220312/bd991c104ee74db4aba7b76330f98732.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyNDQ4MzQ5_size_16_color_FFFFFF_t_70 1]: /images/20220312/869b01bc12a54b96ba08784f42f9df27.png