您的JS必须打印/追加<img>
指向1x1透明GIF图像到文档。 JS收集的所有信息都可以作为图像URL上的查询字符串发送。谷歌分析确实similar thing。
基本上是:
<script src="http://yourdomain.com/track.js"></script>
有:
var requestURI = window.location;
var referrer = document.referrer;
var resolution = screen.width + 'x' + screen.height;
var colorDepth = screen.colorDepth;
// ...
var query = '?requestURI=' + encodeURIComponent(requestURI)
+ '&referrer=' + encodeURIComponent(referrer)
+ '&resolution=' + encodeURIComponent(resolution)
+ '&colorDepth=' + encodeURIComponent(colorDepth);
document.write('<img src="http://yourdomain.com/track.gif' + query + '" />');
然后,在yourdomain.com,你必须对图片网址servlet地图:
<servlet>
<servlet-name>trackServlet</servlet-name>
<servlet-class>com.example.TrackServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>trackServlet</servlet-name>
<url-pattern>/track.gif</url-pattern>
</servlet-mapping>
在doGet()
servlet的方法可以收集所有信息并最终返回一个真正的1x1 gif图像:
private static final byte[] GIF = {
71, 73, 70, 56, 57, 97, 1, 0, 1, 0, -16, 0, 0, 0, 0, 0, 0, 0, 0, 33, -7,
4, 1, 0, 0, 0, 0, 44, 0, 0, 0, 0, 1, 0, 1, 0, 0, 2, 2, 68, 1, 0, 59
};
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// Gather JS-collected parameters.
String requestURI = request.getParameter("requestURI");
String referrer = request.getParameter("referrer");
String resolution = request.getParameter("resolution");
String colorDepth = request.getParameter("colorDepth");
// ...
// Gather server-collected parameters.
String remoteAddr = request.getRemoteAddr();
String userAgent = request.getHeader("user-agent");
// ...
// Send 1x1 transparent gif (and disable browser caching on it!)
response.setHeader("Content-Type", "image/gif");
response.setHeader("Cache-Control", "no-cache,no-store,must-revalidate");
response.setHeader("Pragma", "no-cache");
response.setDateHeader("Expires", 0);
response.getOutputStream().write(GIF);
}
不错的解释!谢谢。关于如何在服务器端获取提供者名称的任何想法? – 2011-05-22 19:43:10
不客气。但是,你认为“提供者”究竟意味着什么?这个术语在当前的情况下非常不明确。 – BalusC 2011-05-22 19:46:31
我想跟踪用户的IP,地理位置和Internet服务提供商。 – 2011-05-23 06:37:19