springboot2.1.3 配置前后端跨域问题

很简单，创建一个配置类即可，如下：

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package com.app.gateway.common.config;   import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.config.annotation.CorsRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;   @Configuration public class WebMvcConfig implements WebMvcConfigurer {           public void addCorsMappings(CorsRegistry registry) {         registry.addMapping("/**")                     .allowedOrigins("*")                     .allowedHeaders("*")                     .allowedMethods("*")                     .maxAge(30 * 1000);     }       }