request 获取 ip

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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.getRemoteAddr(); 
} 
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"); 
} 
// 如果是多级代理，那么取第一个ip为客户ip 
if (ip != null && ip.indexOf(",") != -1) { 
  ip = ip.substring(ip.lastIndexOf(",") + 1, ip.length()).trim(); 
} 
return ip; 
}