如何通过java获取请求的ip

Question

用springboot开启服务，当有人访问接口的时候，记录下客户端的ip地址。
遇到的问题：一个局域网内的出口ip都是一个，那我怎么获取这个ip局域网内的每个设备的内网ip呢，比如我现在电脑和pad在连着一个wifi，访问我部署服务的地址(通过公网访问)，会发现接口中记录的两个设备的ip是一样的，我想把这种的时候记录设备的内网ip，不知道行不行。

Answer 1

无法得到内网IP的。

Answer 2

客户端真实IP地址的方法一：

public String getRemortIP(HttpServletRequest request) {
if (request.getHeader("x-forwarded-for") == null) {
return request.getRemoteAddr();
}
return request.getHeader("x-forwarded-for");
}
获得客户端真实IP地址的方法二：

public 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(); 
   } 
   return ip; 

}
以上方法还不行的话就采用如下方法：

/** 
 * 获取当前网络ip 
 * @param request 
 * @return 
 */  
public String getIpAddr(HttpServletRequest request){  
    String ipAddress = request.getHeader("x-forwarded-for");  
        if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {  
            ipAddress = request.getHeader("Proxy-Client-IP");  
        }  
        if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {  
            ipAddress = request.getHeader("WL-Proxy-Client-IP");  
        }  
        if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {  
            ipAddress = request.getRemoteAddr();  
            if(ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")){  
                //根据网卡取本机配置的IP  
                InetAddress inet=null;  
                try {  
                    inet = InetAddress.getLocalHost();  
                } catch (UnknownHostException e) {  
                    e.printStackTrace();  
                }  
                ipAddress= inet.getHostAddress();  
            }  
        }  
        //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割  
        if(ipAddress!=null && ipAddress.length()>15){ //"***.***.***.***".length() = 15  
            if(ipAddress.indexOf(",")>0){  
                ipAddress = ipAddress.substring(0,ipAddress.indexOf(","));  
            }  
        }  
        return ipAddress;   
}