@SpringBootApplication
public?class?AjaxserverApplication?{

????public?static?void?main(String[]?args)?{
????????SpringApplication.run(AjaxserverApplication.class,?args);
????}

????@Bean
????public?FilterRegistrationBean?registerFilter()?{
????????FilterRegistrationBean?bean?=?new?FilterRegistrationBean();
????????bean.addUrlPatterns("/*");
????????bean.setFilter(new?CrosFilter());
????????return?bean;
????}

}

public?class?CrosFilter?implements?Filter?{
????@Override
????public?void?doFilter(ServletRequest?request,?ServletResponse?response,?FilterChain?chain)?throws?IOException,?ServletException?{
????????HttpServletResponse?res?=?(HttpServletResponse)?response;
????????res.addHeader("Access-Control-Allow-Origin",?"*");
????????res.addHeader("Access-Control-Allow-Methods",?"*");
????????chain.doFilter(request,?response);
????}
????@Override
????public?void?init(FilterConfig?filterConfig)?throws?ServletException?{}
????@Override
????public?void?destroy()?{}
}

但還是報錯，不知道問題出在哪里，打斷點也沒看出問題在哪里