Spring Boot中如何解决跨域问题?

跨域解决方法分享

跨域:
   在前端中可使用JSONP来解决
   
   在后端中使用
      (CORS,Cross-origin resource sharing)
       来解决跨域问题 

@Configuration
public class CorsConfig implements WebMvcConfigurer {
   @Override
   public void addCorsMappings(CorsRegistry registry) {
       registry.addMapping("/**")
              .allowedOrigins("*")
              .allowCredentials(true)
              .allowedMethods("GET", "POST", "PUT", "DELETE", "OPTIONS")
              .maxAge(3600);
   }
}

springboot解决跨域问题时
我们需将cors放入到filter中(因为filter先运行)

 
@Configuration
public class CorsConfig {

   @Bean
   public CorsFilter corsFilter() {
       CorsConfiguration corsConfiguration = new CorsConfiguration();
       corsConfiguration.addAllowedOrigin("*");
       corsConfiguration.addAllowedHeader("*");
       corsConfiguration.addAllowedMethod("*");
       corsConfiguration.setAllowCredentials(true);
       UrlBasedCorsConfigurationSource urlBasedCorsConfigurationSource = new UrlBasedCorsConfigurationSource();
       urlBasedCorsConfigurationSource.registerCorsConfiguration("/**", corsConfiguration);
       return new CorsFilter(urlBasedCorsConfigurationSource);
  }

}