springboot web跨域访问问题解决–addCorsMappings和CorsFilter

@Configuration
public class CorsConfig extends WebMvcConfigurerAdapter {
  @Override
  public void addCorsMappings(CorsRegistry registry) {
    registry.addMapping("/**")
        .allowedOrigins("*")
        .allowCredentials(true)
        .allowedMethods("GET", "POST", "DELETE", "PUT")
        .maxAge(3600);
  }
  private CorsConfiguration addcorsConfig() {
    CorsConfiguration corsConfiguration = new CorsConfiguration();
    List<String> list = new ArrayList<>();
    list.add("*");
    corsConfiguration.setAllowedOrigins(list);
    /*
    // 请求常用的三种配置，*代表允许所有，当时你也可以自定义属性（比如header只能带什么，只能是post方式等等）
    */
    corsConfiguration.addAllowedOrigin("*"); 
    corsConfiguration.addAllowedHeader("*"); 
    corsConfiguration.addAllowedMethod("*"); 
    return corsConfiguration;
  }
  @Bean
  public CorsFilter corsFilter() {
    UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
    source.registerCorsConfiguration("/**", addcorsConfig());
    return new CorsFilter(source);
  }
}