@Configuration

public class GlobalCorsConfig implements WebMvcConfigurer {

    //添加到容器中管理

	@Bean

    public CorsFilter corsFilter() {

        CorsConfiguration config = new CorsConfiguration();

          config.addAllowedOrigin("*");

          config.setAllowCredentials(true);

          config.addAllowedMethod("*");

          config.addAllowedHeader("*");

          config.addExposedHeader("*");

        UrlBasedCorsConfigurationSource configSource = new UrlBasedCorsConfigurationSource();

        configSource.registerCorsConfiguration("/**", config);

        return new CorsFilter(configSource);

    }

}

@Configuration

public class MyConfiguration extends WebMvcConfigurerAdapter  {

    @Override

    public void addCorsMappings(CorsRegistry registry) {

        registry.addMapping("/**")

                .allowCredentials(true)

                .allowedHeaders("*")

                .allowedOrigins("*")

                .allowedMethods("*");  

    }

}

@RequestMapping("/hello")

@CrossOrigin("http://127.0.0.1:8080")

public String hello( ){

　　return "Hello World springboot";

}