避免使用InetAddress - 以网络字节顺序获取原始IP地址 [英] Avoid using InetAddress - Getting a raw IP address in network byte order

问题描述

我试图在Google App Engine上使用MaxMind GeoLite国家/地区数据库。但是，我很难让Java API工作，因为它依赖于App Engine上无法使用的InetAddress类。

I am trying to use the MaxMind GeoLite Country database on the Google App Engine. However, I am having difficulty getting the Java API to work as it relies on the InetAddress class which is not available to use on the App Engine.

然而，我不是确定是否有一个简单的解决方法，因为它看起来只使用InetAddress类来确定给定主机名的IP。在我的情况下，主机名始终是IP。

However, I am not sure if there is a simple workaround as it appears it only uses the InetAddress class to determine the IP of a given hostname. In my case, the hostname is always an IP anyway.

我需要的是将表示为String的IP地址转换为网络字节顺序的字节数组（InetAddress类的addr.getAddress（）方法提供）。

What I need is a way to convert an IP address represented as a String into a byte array of network byte order (which the addr.getAddress() method of the InetAddress class provides).

这是当前API使用的代码，我需要找到一种删除所有引用到InetAddress，同时确保它仍然有效！

This is the code the current API uses, I need to find a way of removing all references to InetAddress whilst ensuring it still works!

感谢您的宝贵时间。

/**
 * Returns the country the IP address is in.
 *
 * @param ipAddress String version of an IP address, i.e. "127.0.0.1"
 * @return the country the IP address is from.
 */
public Country getCountry(String ipAddress) {
    InetAddress addr;
    try {
        addr = InetAddress.getByName(ipAddress);
    } catch (UnknownHostException e) {
        return UNKNOWN_COUNTRY;
    }
    return getCountry(bytesToLong(addr.getAddress()));
}

推荐答案

// note: this is ipv4 specific, and i haven't tried to compile it.
long ipAsLong = 0;
for (String byteString : ipAddress.split("\\."))
{
    ipAsLong = (ipAsLong << 8) | Integer.parseInt(byteString);
}

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