获取IP

于 2013-01-18 16:17:00 发布 · 113 阅读

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本文介绍了一种通过Java代码从HttpServletRequest请求中获取客户端真实IP地址的方法。该方法依次尝试使用x-forwarded-for、Proxy-Client-IP、WL-Proxy-Client-IP等头部信息，并最终回退到使用request.getRemoteAddr()来确保获取到有效的IP地址。

public String getIpAddr(HttpServletRequest request) {
String ip = request.getHeader("x-forwarded-for");
if(ip == null || ip.length() == || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("Proxy-Client-IP");
}
if(ip == null || ip.length() == || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("WL-Proxy-Client-IP");
}
if(ip == null || ip.length() == || "unknown".equalsIgnoreCase(ip)) {
ip = request.getRemoteAddr();
}
return ip;
}