java获取客户端IP

public String getRemortIP(HttpServletRequest request) { 
  if (request.getHeader("x-forwarded-for") == null) { 
   return request.getRemoteAddr(); 
  } 
  return request.getHeader("x-forwarded-for"); 
 } 

原文：http://developer.51cto.com/art/201111/305181.htm