原地址：https://blog.csdn.net/github_36301064/article/details/68066741

Web项目中得到访问者的真实ip

描述：最近要实现个功能是要记录管理员登录的真实ip，但在项目中如果直接使用request.getRemoteAddr()获得ip的话，获得的可能不是真实ip，是因为使用代理的一些原因，所以我们要自己找个方法，具体方法如下：

public class Utils {  
      
    /** 
     * 获取ip 
     * @param request 
     * @return 
     */  
    public static String getIp(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.getHeader("HTTP_CLIENT_IP");  
        }  
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");  
        }  
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
            ip = request.getRemoteAddr();  
        }  
        return ip;  
    }  
      
}