spring boot允许跨域（CORS）的配置

添加@Configuration配置类即可。

@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedOrigins("*")
                .allowedMethods("POST", "GET", "PUT", "OPTIONS", "DELETE")
                .maxAge()
                .allowCredentials(true);
    }
}