解决前后端分离情况下vue集成axios时的跨域问题

1、单个springboot新增下面这个类即可
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class CorsConfig implements WebMvcConfigurer {

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedOrigins("*")
                .allowedHeaders(CorsConfiguration.ALL)
                .allowedMethods(CorsConfiguration.ALL)
                .allowCredentials(true)
                .maxAge(3600); // 1小时内不需要再预检（发OPTIONS请求）
    }

}

2、springcloud微服务，有gateway管理时在gatewayapplication下新增下面新增

/**
 * 配置跨域
 * @return
 */
@Bean
public CorsWebFilter corsFilter() {
   CorsConfiguration config = new CorsConfiguration();

   config.setAllowCredentials(Boolean.TRUE);
   config.addAllowedMethod("*");
   config.addAllowedOrigin("*");
   config.addAllowedHeader("*");
   config.setMaxAge(3600L);

   UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource(new PathPatternParser());
   source.registerCorsConfiguration("/**", config);

   return new CorsWebFilter(source);
}