如何从request中获取域名

//获取是http 还是 https,如果有通过nginx就行转发，记得配置带上sceme信息
String scheme = request.getScheme();
System.out.println("scheme = " + scheme);
//获取域名 
String serverName = request.getServerName();
System.out.println("serverName = " + serverName);
//组装成基础url
String basePath = scheme + "://" + request.getServerName() + "/";
System.out.println("basePath = " + basePath);

效果 basePath = http://ssvass-uat.longfor.com/