java 获取请求ip-优快云博客

本文链接：https://blog.youkuaiyun.com/iteye_3114/article/details/82443792

本文介绍了通过HttpServletRequest获取IP地址的多种方法，包括x-forwarded-for、Proxy-Client-IP和WL-Proxy-Client-IP等头部信息，以及直接获取远程地址的方法。重点在于解析这些信息，以确保在不同网络环境下正确获取客户端的真实IP。

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public class IpUtil {

public static String getIpAddrByRequest(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;

}

* @return 本机IP

* @throws SocketException

*/

public static String getRealIp() throws SocketException {

String localip = null;// 本地IP，如果没有配置外网IP则返回它

String netip = null;// 外网IP

41
Enumeration<NetworkInterface> netInterfaces =

NetworkInterface.getNetworkInterfaces();

InetAddress ip = null;

boolean finded = false;// 是否找到外网IP

while (netInterfaces.hasMoreElements() && !finded) {

NetworkInterface ni = netInterfaces.nextElement();

Enumeration<InetAddress> address = ni.getInetAddresses();

while (address.hasMoreElements()) {

ip = address.nextElement();

if (!ip.isSiteLocalAddress()

&& !ip.isLoopbackAddress()

&& ip.getHostAddress().indexOf(":") == -1) {// 外网IP

netip = ip.getHostAddress();

finded = true;

break;

} else if (ip.isSiteLocalAddress()

&& !ip.isLoopbackAddress()

&& ip.getHostAddress().indexOf(":") == -1) {// 内网IP

localip = ip.getHostAddress();

}

}

}

if (netip != null && !"".equals(netip)) {

return netip;

} else {

return localip;

}

}

}