获取客户端的请求ip地址

在与第三方进行合作的时候，不可避免的需要相互提供调用接口。

为了让自己的服务接口更加安全和稳定，我们需要对请求的ip进行过滤

那么获取真实的请求ip就成为了关键

废话不多说，直接上代码:

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.getHeader("X-Real-IP");
		}
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getRemoteAddr();
		}
		if (ip.indexOf(",") != -1) {
			ip = ip.substring(0, ip.indexOf(","));
		}
		return ip.trim();
	}