Java获得客户端真实IP
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;}

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，取X-Forwarded-For中第一个非unknown的有效IP字符串。如： X-Forwarded-For：192.168.1.101， 192.168.1.120， 192.168.1.130， 192.168.1.140 用户真实IP为： 192.168.1.101