Angular + Springboot :如何让路由的angular应用程序从服务器端回退到index.html？

@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/{spring:\\w+}")
                .setViewName("forward:/");
        registry.addViewController("/**/{spring:\\w+}")
                .setViewName("forward:/");
        registry.addViewController("/{spring:\\w+}/**{spring:?!(\\.js|\\.css)$}")
                .setViewName("forward:/");
    }
}

import { NgModule } from '@angular/core';
import { HashLocationStrategy, LocationStrategy } from '@angular/common';

@NgModule({
  // ...
  providers: [{ provide: LocationStrategy, useClass: HashLocationStrategy }],
  // ...
})
export class AppModule { }