springboot 跨域

参考：

https://blog.csdn.net/qq779446849/article/details/53102925

https://blog.csdn.net/wo541075754/article/details/50696841

springboot启动类中添加2个方法：

    private CorsConfiguration buildConfig() {
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        // 允许跨域访问的域名
        corsConfiguration.addAllowedOrigin("*");// 请求头
        corsConfiguration.addAllowedHeader("*");
        // 请求方法 HttpMethod.DELETE/POST/GET/PUT/DELETE/OPTIONS
        corsConfiguration.addAllowedMethod("*");
        // 预检请求的有效期，单位为秒。
        corsConfiguration.setMaxAge(3600L);

        return corsConfiguration;
    }  

    /**
     * 跨域过滤器
     * @return
     */
    @Bean
    public CorsFilter corsFilter() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", buildConfig()); // 4
        return new CorsFilter(source);
    }

跨域安全问题：https://www.cnblogs.com/cloudshare/p/7192646.html