通過httprequest獲取用戶ip

轉的，留着吧。。

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;

import org.apache.log4j.Logger;


public final class NetworkUtil {
	private static Logger logger = Logger.getLogger(NetworkUtil.class);

	/**
	 * 獲取請求主機IP地址,如果通過代理進來，則透過防火牆獲取真實IP地址;
	* @Title: getIpAddress 
	* @Description: TODO 
	* @param @param request
	* @param @return
	* @param @throws IOException     
	* @return String     
	* @throws 
	* @author zhangjf
	 */
	public final static String getIpAddress(HttpServletRequest request) throws IOException {
		String ip = request.getHeader("X-Forwarded-For");
		if (logger.isInfoEnabled()) {
			logger.info("getIpAddress(HttpServletRequest) - X-Forwarded-For - String ip=" + ip);
		}

		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
				ip = request.getHeader("Proxy-Client-IP");
				if (logger.isInfoEnabled()) {
					logger.info("getIpAddress(HttpServletRequest) - Proxy-Client-IP - String ip=" + ip);
				}
			}
			if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
				ip = request.getHeader("WL-Proxy-Client-IP");
				if (logger.isInfoEnabled()) {
					logger.info("getIpAddress(HttpServletRequest) - WL-Proxy-Client-IP - String ip=" + ip);
				}
			}
			if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
				ip = request.getHeader("HTTP_CLIENT_IP");
				if (logger.isInfoEnabled()) {
					logger.info("getIpAddress(HttpServletRequest) - HTTP_CLIENT_IP - String ip=" + ip);
				}
			}
			if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
				ip = request.getHeader("HTTP_X_FORWARDED_FOR");
				if (logger.isInfoEnabled()) {
					logger.info("getIpAddress(HttpServletRequest) - HTTP_X_FORWARDED_FOR - String ip=" + ip);
				}
			}
			if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
				ip = request.getRemoteAddr();
				if (logger.isInfoEnabled()) {
					logger.info("getIpAddress(HttpServletRequest) - getRemoteAddr - String ip=" + ip);
				}
			}
		} else if (ip.length() > 15) {
			String[] ips = ip.split(",");
			for (int index = 0; index < ips.length; index++) {
				String strIp = (String) ips[index];
				if (!("unknown".equalsIgnoreCase(strIp))) {
					ip = strIp;
					break;
				}
			}
		}
		return ip;
	}
}