java获取IP地址

public String getIpAddrByRequest(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();
 }
 return ip;
}

 

原文地址：http://www.oschina.net/code/snippet_107039_5299