假如用代理服务器，request.getRemoteAddr(); 只能得到代理服务器地址 以下方法是得到正确所有ip的方法 在jsp声明这个函数 <%!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();         }         return ip;     }%> 嵌入jsp网页中，然后用<%String ip=getIpAddr(request);%>得到访问者ip ip就是访问者的ip，你保存到数据库或者缓存中，就由你自己了