解决前后端跨域报错：has been blocked by CORS policy: No ‘Access-Control-Allow-Origin‘

一、报错信息

has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

来自一个IP端口的页面（前端项目），要访问另一个IP端口的资源（springboot请求接口），会产生跨域访问。

二、解决方法：增加配置类CorsConfig

@Configurationpublic class CorsConfig implements WebMvcConfigurer {@Overridepublic void addCorsMappings(CorsRegistry registry){registry.addMapping("/**").allowedOriginPatterns("*").allowedHeaders(CorsConfiguration.ALL).allowedMethods(CorsConfiguration.ALL).allowCredentials(true).maxAge(3600);}}