java获取请求者IP地址

最新推荐文章于 2025-05-22 00:15:00 发布

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本文介绍了一种在Java中通过HttpServletRequest对象获取客户端真实IP地址的方法。该方法依次检查多种代理服务器头字段，如X-Forwarded-For、Proxy-Client-IP等，以确保即使在网络中有多个代理的情况下也能准确获得客户端的IP地址。

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public static String getIPAddress(HttpServletRequest request) {
String ip = null;

//X-Forwarded-For：Squid 服务代理
String ipAddresses = request.getHeader("X-Forwarded-For");

if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
//Proxy-Client-IP：apache 服务代理
ipAddresses = request.getHeader("Proxy-Client-IP");
}

if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
//WL-Proxy-Client-IP：weblogic 服务代理
ipAddresses = request.getHeader("WL-Proxy-Client-IP");
}

if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
//HTTP_CLIENT_IP：有些代理服务器
ipAddresses = request.getHeader("HTTP_CLIENT_IP");
}

if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
//X-Real-IP：nginx服务代理
ipAddresses = request.getHeader("X-Real-IP");
}

//有些网络通过多层代理，那么获取到的ip就会有多个，一般都是通过逗号（,）分割开来，并且第一个ip为客户端的真实IP
if (ipAddresses != null && ipAddresses.length() != 0) {
ip = ipAddresses.split(",")[0];
}

//还是不能获取到，最后再通过request.getRemoteAddr();获取
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
ip = request.getRemoteAddr();
}
return ip;
}