java 与js获取服务器域名

java：

//           192.168.1.103
            log.debug(request.getRemoteHost());  
//            192.168.1.103
            log.debug(request.getRemoteAddr());  
//            52721
            log.debug(request.getRemotePort());  
//            null
            log.debug(request.getRemoteUser());  
//            192.168.1.103:8080
            log.debug(request.getHeader("Host"));
//            192.168.1.103
            log.debug(request.getServerName());  //           192.168.1.103
            log.