【汇智学堂】java获取用户ip地址，处理0:0:0:0:0:0:0:1

/**
 * 获得用户远程地址
 */
public static String getRemoteAddr(HttpServletRequest request){
	/*String remoteAddr = request.getHeader("X-Real-IP");
    if (isNotBlank(remoteAddr)) {
    	remoteAddr = request.getHeader("X-Forwarded-For");
    }else if (isNotBlank(remoteAddr)) {
    	remoteAddr = request.getHeader("Proxy-Client-IP");
    }else if (isNotBlank(remoteAddr)) {
    	remoteAddr = request.getHeader("WL-Proxy-Client-IP");
    }
    return remoteAddr != null ? remoteAddr : request.getRemoteAddr();*/


	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;
}