题外话，前端也可以调用已有的接口获取ip，例如调用搜狐接口 https://pv.sohu.com/cityjson?ie=utf-8
在spring框架中，获取IP接口，则需要获取 HttpServletRequest 对象，该对象中包含了客户端请求的相关信息。
java代码如下：
/**
* @Description: 获取客户端IP地址
*/
private String getIpAddr(HttpServletRequest request) {
String ip = request.getHeader("x-forwarded-for");
if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("Proxy-Client-IP");
}
if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("WL-Proxy-Client-IP");
}
if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getRemoteAddr();
if(ip.equals("127.0.0.1")){
//根据网卡取本机配置的IP
InetAddress inet=null;
try {
inet = InetAddress.getLocalHost();
} catch (Exception e) {
e.printStackTrace();
}
ip= inet.getHostAddress();
}
}
// 多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
if(ip != null && ip.length() > 15){
if(ip.indexOf(",")>0){
ip = ip.substring(0,ip.indexOf(","));
}
}
return ip;
}