跨域訪問時很多需求，所以springboot的跨域解決也是【必須的】

攔截器方式

//自定義攔截器
import org.springframework.web.servlet.HandlerInterceptor;

public class CorsInterceptor implements HandlerInterceptor{

    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws
 
 Exception{

    String origin = httpServletRequest.getHeader("Origin");
    httpServletResponse.setHeader("Access-Control-Allow-Origin", origin);
    httpServletResponse.setHeader("Access-Control-Allow-Methods", "*");
    httpServletResponse.setHeader("Access-Control-Allow-Headers","Origin,Content-Type,Accept,token,X-Requested-With"
 
);
    httpServletResponse.setHeader("Access-Control-Allow-Credentials", "true");

    return true;
    }
    //其他postHandle,afterCompletion空繼承
}

//配置類加入自定義攔截器
@Configuration
public class MvcConfig extends WebMvcConfigurationSupport{

    @Override
    public void addInterceptors(InterceptorRegistry registry){
        registry.addInterceptor(new
 
 CorsInterceptor()).addPathPatterns("/**");
    }

}