http://localhost:8080‘ has been blocked by CORS policy:

这个问题也是在开发中遇到的，我遇到的是静态页面请求后台报错。查询为跨域报错，记录一下。解决方法：

后台请求配置@CrossOrigin注解，同时创建config文件

@Configuration
public class GlobalCorsConfig{
    @Bean
    public CorsFilter corsFilter() {
        //1.添加CORS配置信息
        CorsConfiguration config = new CorsConfiguration();
        //放行哪些原始域
        config.addAllowedOrigin("*");
        //是否发送Cookie信息
        config.setAllowCredentials(true);
        //放行哪些原始域(请求方式)
        config.addAllowedMethod("OPTIONS");
        config.addAllowedMethod("HEAD");
        config.addAllowedMethod("GET");     //get
        config.addAllowedMethod("PUT");     //put
        config.addAllowedMethod("POST");    //post
        config.addAllowedMethod("DELETE");  //delete
        config.addAllowedMethod("PATCH");
        config.addAllowedHeader("*");

        //2.添加映射路径
        UrlBasedCorsConfigurationSource configSource = new UrlBasedCorsConfigurationSource();
        configSource.registerCorsConfiguration("/**", config);

        //3.返回新的CorsFilter.
        return new CorsFilter(configSource);
    }

}