java 获取通过n'gin'x代理客户端ip

可以使用HttpServletRequest的getRemoteAddr()方法获取客户端IP地址，但是如果使用了Nginx代理，需要在Nginx配置中添加以下内容：

proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

然后在Java代码中使用以下方法获取真实的客户端IP地址：

String ip = request.getHeader("X-Real-IP");
if (ip == null || ip.length() == || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("X-Forwarded-For");
}
if (ip == null || ip.length() == || "unknown".equalsIgnoreCase(ip)) {
ip = request.getRemoteAddr();
}