IpUtils.java
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package com.jflyfox.util;
import java.util.regex.Pattern;
import javax.servlet.http.HttpServletRequest;
/**
* 获取真实IP
*
* 2016年1月14日 下午10:44:05 flyfox 330627517@qq.com
*/
public class IpUtils {
/**
* 尽量获取客户端真实ip
*
* @param request
* HttpServletRequest对象
* @return 客户端ip
*/
public static String getClientIP(HttpServletRequest request) {
if (request == null) {
return null;
}
String xff = request.getHeader("X-Forwarded-For");
String ip = getClientIPFromXFF(xff);
if (ip != null) {
return ip;
}
ip = request.getHeader("Proxy-Client-IP");
if (isValidIP(ip)) {
return ip;
}
ip = request.getHeader("WL-Proxy-Client-IP");
if (isValidIP(ip)) {
return ip;
}
ip = request.getRemoteAddr();
return ip;
}
private static String getClientIPFromXFF(String xff) {
if ((xff == null) || (xff.length() == 0)) {
return null;
}
String[] ss = xff.split(",");
for (String ip : ss) {
ip = ip.trim();
// 取第一个合法的IP并返回
if (isValidIP(ip)) {
return ip;
}
}
return null;
}
private static final Pattern ipPattern = Pattern.compile("([0-9]{1,3}\\.){3}[0-9]{1,3}");
private static boolean isValidIP(String ip) {
if ((ip == null) || (ip.length() == 0) || "unknown".equalsIgnoreCase(ip)) {
return false;
}
return ipPattern.matcher(ip).matches();
}
}