获取ip地址的Utils

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调用的时候，返回字符串：String ipAddress = IPUtils.getIPAddress(request);

package com.ocean.utils;

import javax.servlet.http.HttpServletRequest;

public class IPUtils {

	public static String getIPAddress(HttpServletRequest request) {
	    String ip = null;

	    //X-Forwarded-For：Squid 服务代理
	    String ipAddresses = request.getHeader("X-Forwarded-For");

	    if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
	        //Proxy-Client-IP：apache 服务代理
	        ipAddresses = request.getHeader("Proxy-Client-IP");
	    }

	    if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
	        //WL-Proxy-Client-IP：weblogic 服务代理
	        ipAddresses = request.getHeader("WL-Proxy-Client-IP");
	    }

	    if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
	        //HTTP_CLIENT_IP：有些代理服务器
	        ipAddresses = request.getHeader("HTTP_CLIENT_IP");
	    }

	    if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
	        //X-Real-IP：nginx服务代理
	        ipAddresses = request.getHeader("X-Real-IP");
	    }

	    //有些网络通过多层代理，那么获取到的ip就会有多个，一般都是通过逗号（,）分割开来，并且第一个ip为客户端的真实IP
	    if (ipAddresses != null && ipAddresses.length() != 0) {
	        ip = ipAddresses.split(",")[0];
	    }

	    //还是不能获取到，最后再通过request.getRemoteAddr();获取
	    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
	        ip = request.getRemoteAddr();
	    }
	    return ip;
	}
}