怎样去理解@ComponentScan注解

怎样去理解@ComponentScan注解

@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 MyInterceptor()).addPathPatterns(/**)
}

}

?
11111@WebFilter(filterName=myFilter,urlPatterns=/*)
public class MyFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println(**********************************过滤器初始化***********************************/n)
}

@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
System.out.println(***********************************执行过