java获取客户端真实IP地址详解编程语言

像移动网关一样，iisforward这个ISAPI过滤器也会对request对象进行再包装，附加一些WLS要用的头信息。这种情况下，直接用request.getRemoteAddr()是无法取到真正的客户IP的。

实际的iisforward附加头如下：

综上，正确作法如下：

private String getIpAddr() {
String ipAddress = null;
//ipAddress = this.getRequest().getRemoteAddr();
ipAddress = this.getRequest().getHeader(“x-forwarded-for”);
if(ipAddress == null || ipAddress.length() == 0 || “unknown”.equalsIgnoreCase(ipAddress)) {
ipAddress = this.getRequest().getHeader(“Proxy-Client-IP”);
}
if(ipAddress == null || ipAddress.length() == 0 || “unknown”.equalsIgnoreCase(ipAddress)) {
ipAddress = this.getRequest().getHeader(“WL-Proxy-Client-IP”);
}
if(ipAddress == null || ipAddress.length() == 0 || “unknown”.equalsIgnoreCase(ipAddress)) {
ipAddress = this.getRequest().getRemoteAddr();
if(ipAddress.equals(“127.0.0.1”)){
//根据网卡取本机配置的IP
InetAddress inet=null;
try {
inet = InetAddress.getLocalHost();
} catch (UnknownHostException e) {
e.printStackTrace();
}
ipAddress= inet.getHostAddress();
}
}
//对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照’,’分割
if(ipAddress!=null && ipAddress.length()>15){ //”***.***.***.***”.length() = 15
if(ipAddress.indexOf(“,”)>0){
ipAddress = ipAddress.substring(0,ipAddress.indexOf(“,”));
}
}
return ipAddress;
}

原创文章，作者：Maggie-Hunter，如若转载，请注明出处：https://blog.ytso.com/industrynews/13567.html