原始代码

/**
  * <p>Description：跨域请求配置类</p>
  * @author：gusong
  * @date：2019/4/1 19:59
  */
@Configuration
public class CorsConfig {
          
   
    /**
     * <p>Description：配置允许跨域访问</p>
     * @return：org.springframework.web.cors.CorsConfiguration
     * @author：gusong
     * @date：2019/4/1 20:01
     */
    private CorsConfiguration buildConfig() {
          
   
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        corsConfiguration.setAllowCredentials(true);
        corsConfiguration.addAllowedOrigin("*");
        corsConfiguration.addAllowedHeader("*");
        corsConfiguration.addAllowedMethod("*");
        return corsConfiguration;
    }

    /**
     * <p>Description：跨域过滤器</p>
     * @return：CorsFilter
     * @author：gusong
     * @date：2019/4/1 20:02
     */
    @Bean
    public CorsFilter corsFilter() {
          
   
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", buildConfig());
        return new CorsFilter(source);
    }
}

新代码

@Configuration
public class CorsConfig {
          
   

    @Value("${spring.profiles.active}")
    private String HSAY_ENV;

    private final String[] env = new String[]{
          
   "dev","release"};

    private CorsConfiguration buildConfig() {
          
   

        CorsConfiguration corsConfiguration = new CorsConfiguration();

        //允许任何域名[多行]
        corsConfiguration.addAllowedOrigin("*");
        //允许任何头
        corsConfiguration.addAllowedHeader("*");
        //允许任何方法
        corsConfiguration.addAllowedMethod("*");
        // 3.允许ajax异步请求带cookie信息
        corsConfiguration.setAllowCredentials(true);

        return corsConfiguration;
    }

    @Bean
    public FilterRegistrationBean corsFilter(){
          
   
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        //注册
        if(Arrays.asList(env).contains(HSAY_ENV)) {
          
   
            source.registerCorsConfiguration("/**", buildConfig());
        }
        FilterRegistrationBean bean = new FilterRegistrationBean(new CorsFilter(source));
        // 这个顺序很重要，为避免麻烦请设置在最前
        bean.setOrder(0);
        return bean;
    }
}

对比

对比发现什么问题了么？没错就是corsFilter这个方法的返回值。以及对于bean的设置问题，因为是偶发的所以猜到肯定和加载顺序有关系。