nginx配置报头X-Real-IP为用户的真实IP

/**
* nginx配置报头X-Real-IP为用户的真实IP
* @param request
* @return
*/
public String getIpAddr(HttpServletRequest request) {
String ip = request.getHeader("X-Real-IP");
if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
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();
}

String ips[] = ip.split(",");

for (int i=ips.length-1;i>=0;i--)
{
String tmpip = ips[i].trim();
if (! tmpip.equals("")) return tmpip;
}

return ip;
}