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纬度和经度来标记所需的位置.有什么方法可以为用户的当前位置添加标记到地图上.?有没有办法获取用户的经纬度?有没有人做过?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

您需要计算出用户的 IP 地址，然后将其提供给某些 IP 地理定位工具/API，以获取纬度/经度的地理位置.最后将此信息用于您的 Google 地图.

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 能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();
// ...

如果您还想考虑代理，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];
}

// ...

您又必须使用哪个 IP 地理定位工具/API 是一个您必须自己回答的问题.只需向 Google 输入关键字ip geo location"即可开始使用.

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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