has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.

前端顯示:

has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.

　　跨域問題,解決辦法:

　　　　　　在對應的Controller上加上@CrossOrigin注解,或者在springBoot里面寫一個配置類實現全局跨域:

@SpringBootConfiguration
public class MyWebConfigurer implements WebMvcConfigurer {

    @Override
    public void addCorsMappings(CorsRegistry corsRegistry){
        /**
         * 所有請求都允許跨域，使用這種配置就不需要
         * 在interceptor中配置header了
         */
        corsRegistry.addMapping("/**")
                .allowCredentials(true)
                .allowedOrigins("http://localhost:8080")
                .allowedMethods("POST", "GET", "PUT", "OPTIONS", "DELETE")
                .allowedHeaders("*")
                .maxAge(3600);
    }

}