告诉你jsp获取浏览者真实IP地址方法

于是可得出获得客户端真实IP地址的方法一： public String getRemortIP(HttpServletRequest request) { if (request.getHeader("x-forwarded-for") == null) { return request.getRemoteAddr(); } return request.getHeader("x-forwarded-for"); }

获得客户端真实IP地址的方法二： 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; } 可是，如果通过了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP值，究竟哪个才是真正的用户端的真实IP呢？ 答案是取X-Forwarded-For中第一个非unknown的有效IP字符串。如： X-Forwarded-For：192.168.1.110, 192.168.1.120, 192.168.1.130, 192.168.1.100 用户真实IP为： 192.168.1.110