Access to XMLHttpRequest at ‘http://localhost:8080/admin’ from origin ‘http://localhost:8081’ has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.
request.js:34 errAxiosError: Network Error

解决方法1：

添加注解
@CrossOrigin

解决方法二：

cors配置文件

package com.example.configuration;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;

@Configuration
public class CorsConfig {
    @Bean
    public CorsFilter CorsFilter(){
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        corsConfiguration.addAllowedOrigin("*");
        corsConfiguration.addAllowedHeader("*");
        corsConfiguration.addAllowedMethod("*");
        UrlBasedCorsConfigurationSource source=new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**",corsConfiguration);
        return new CorsFilter(source);


    }
}