用拦截器吧


新建一个类，实现`HandlerInterceptor`接口：

```java
public class FooHandlerInterceptor implements HandlerInterceptor {
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
// TODO
return true;
}

public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
// TODO
}

public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
// TODO
}
}
```

新建一个配置类，实现`WebMvcConfigurer`接口，重写`addInterceptors`方法，将拦截器注册到 Spring MVC 容器中：

```
@Configuration
public class FooConfiguration implements WebMvcConfigurer {
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new FooHandlerInterceptor()).addPathPatterns("/**");
}
}
```