java获取nginx反向代理后浏览器的真实ip

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若用nginx做反向代理后，直接用String ip = request.getRemoteAddr();

获取的将是nginx服务器所在ip地址，不能获取浏览器真实ip地址！

第一步：在nginx中添加如下配置：

    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header REMOTE-HOST $remote_addr;

    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

如下图所示：

第二步：获取真实ip地址

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();
}

这样，获取到的就是用户所在公网的ip地址了。