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                [TOC] # 簡介 如果你想保持springboot的一些mvc的特性,又想自定義一些mvc配置,應該讓一個類實現WebMvcConfigurer,并且添加`@Configuration`注解,但是千萬不要加`@EnableWebMvc`注解. 如果想自定義HandlerMapping,HandleAdapter,ExceptionResolver等組件,可以創建一個WebMvcRegistrationsAdapter實例來提供以上組件 如果你想要完全自定義springMvc,不保留springboot提供的一切特征,你可以自己定義類并且添加`@Configuration`注解和`@EnableWebMvc`注解 Springboot 中的 Interceptor 攔截器也就是 mvc 中的攔截器,只是省去了 xml 配置部分。并沒有本質的不同,都是通過實現 HandlerInterceptor 中幾個方法實現。幾個方法的作用一一如下。 1. **preHandle** 進入 Habdler 方法之前執行,一般用于身份認證授權等。 2. **postHandle** 進入 Handler 方法之后返回 modelAndView 之前執行,一般用于塞入公共模型數據等。 3. **afterCompletion** 最后處理,一般用于日志收集,統一后續處理等。 # 攔截器 ~~~ @Slf4j public class MyInterceptor implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { log.info("preHandle method is running"); return true; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { log.info("postHandle method is running"); } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { log.info("afterCompletion method is running"); } } ~~~ # 注冊 ~~~ @Configuration public class MvcConfig implements WebMvcConfigurer { @Override public void addInterceptors(InterceptorRegistry registry) { //把自己的攔截器類注冊進去,然后寫上攔截路徑 registry.addInterceptor(new MyInterceptor()).addPathPatterns("/**"); } } ~~~
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