如何在Primefaces Gmap上标记用户的当前位置? [英] how to mark user's current location on Primefaces Gmap?

问题描述

在Gmap中，我们可以通过传递自定义的纬度和经度来标记所需的位置. 有什么方法可以添加标记来映射用户的当前位置? 有没有一种方法可以获取用户的纬度和经度? 有人做过吗? 请分享您的想法?

In Gmap we can mark, desired location by passing custom latitude and longitude. Is there any way to add marker to map for user's CURRENT LOCATION.? Is there a way to get user's latitude and longitude? Has any one done it before? Please share your idea?

推荐答案

您需要确定用户的IP地址，然后将其提供给某些IP地理位置工具/API，以获取经度/纬度的地理位置.最后，将此信息用于您的Google Map.

You need to figure the user's IP address and then feed it to some IP geo location tool/API in order to get the geo location in latitude/longitude. Finally use this information for your Google Map.

JSF可以为您做的就是为您提供用户的IP地址，如下所示:

All JSF can do for you is giving you the user's IP address as follows:

ExternalContext externalContext = FacesContext.getCurrentInstance().getExternalContext();
HttpServletRequest request = (HttpServletRequest) externalContext.getRequest();
String ip = request.getRemoteAddr();
// ...

如果您还要考虑代理，请检查X-Forwarded-For标头:

If you'd like to take proxies into account as well, then check X-Forwarded-For header:

ExternalContext externalContext = FacesContext.getCurrentInstance().getExternalContext();
HttpServletRequest request = (HttpServletRequest) externalContext.getRequest();
String ip = request.getRemoteAddr();
String forwardedFor = request.getHeader("X-Forwarded-For");

if (forwardedFor != null) {
    ip = forwardedFor.split("\\s*,\\s*", 2)[0];
}

// ...

您又需要使用哪个IP地理位置工具/API，您必须自己回答一个问题.只需向Google提供关键字" ip地理位置"即可.

Which IP geo location tool/API you in turn have to use is a question which you've to answer yourself. Just feed the keywords "ip geo location" to Google to get started.

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