javaweb获取客户端IP终极增强版

javaweb获取客户端ip的时候，少数时候会获取不到，具体状况也不是很清楚，大概是手机客户端有些安装了代理软件之类的，出现这种情况的时候，使用常见的获取ip方式就有些不够用了，下面收集了7个方式来获取客户端ip，通过服务器3天的验证，没有出现获取不到客户端ip的状况。

/**
	 * 获取客户端IP
	 * */
	public String getIpAddr() {
		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.getHeader("X-Real-IP");
		}
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getRemoteAddr();
		}
		
		return ip;
    }