!!!JSP サーバーアドレスを取得
[JSP]

 String remoteHostUrl = request.getScheme() + ":" + request.getServerName();
 if (request.getRemotePort() != 80) {
     remoteHostUrl += (":" + String.valueOf(request.getServerPort()));
 }
 remoteHostUrl += ("/" + pageContext.getServletContext().getServletContextName());