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我们一般使用request.getRemoteAddr)，获取访问用户的ip地址。但是当使用代理后，使用该方法就获取不到真实ip了，而是获取一个相同的ip。

      这时我们可以在http头中获取：

public static String getRemoteAddrHttpServletRequest request) {String ip = request.getHeader"X-Forwarded-For");if ip == null || ip.length) == 0 || "unknown".equalsIgnoreCaseip)) {ip = request.getHeader"Proxy-Client-IP");}if ip == null || ip.length) == 0 || "unknown".equalsIgnoreCaseip)) {ip = request.getHeader"WL-Proxy-Client-IP");}if ip == null || ip.length) == 0 || "unknown".equalsIgnoreCaseip)) {ip = request.getHeader"HTTP_CLIENT_IP");}if ip == null || ip.length) == 0 || "unknown".equalsIgnoreCaseip)) {ip = request.getHeader"HTTP_X_FORWARDED_FOR");}if ip == null || ip.length) == 0 || "unknown".equalsIgnoreCaseip)) {ip = request.getRemoteAddr);}return ip;}

通过上面这个方法，可以获取到用户真实的ip。亲测有效，请大家批评指正