在最新的jdk7中，使用java获取主机名失败 [英] Getting hostname with java fails in latest jdk7

问题描述

我一直在获取机器的主机名如下：

I've been getting hostname of the machine as follows:

InetAddress.getLocalHost().getHostName();

但是，当我输入最新的JDK（jdk1.7.0_04）时，上面的代码只返回LOCALHOST。我检查了/ etc / hosts（它的linux），它说：

However, when I put latest JDK (jdk1.7.0_04), the code above simply return LOCALHOST. I checked /etc/hosts (its linux) and it says there:

127.0.0.1    localhost    redbull

升级之前一直在返回REDBULL。所以我改变了这一点

It's been returning REDBULL until upgrade. So I changed that around putting

127.0.0.1    redbull    localhost

相反，它开始返回REDBULL没有问题。

instead and it started returning REDBULL without a problem.

有没有更好的方法使这项工作？

Is there a better way of making this work?

推荐答案

好吧，我想把它标记为重复，但我发现的唯一答案建议您使用 InetAddress.getLocalHost（）。的gethostname（）。坦率地说，在这种情况下，我认为应该返回localhost。我认为这些答案是正确的，因为实际上没有纯Java方法（至少没有一种可以移植到旧JRE中。）

Well, I thought about flagging this as a dup, but the only answers I find suggest that you use InetAddress.getLocalHost().getHostName(). Which, frankly, I think should return "localhost" in this case. And those answers, I suppose, are correct, in that there's really no pure Java way of doing this (at least none that are portable back to older JREs.)

我们使用JNI来实现这一目标。我们在Mac OS 10.4 +上调用 SCPreferencesGetHostName（），在旧Mac OS上调用 SCDynamicStoreCocalLocalHostName（）， Win32上的GetComputerName（）， gethostname（）其他地方。

We use JNI to accomplish this. We call SCPreferencesGetHostName() on Mac OS 10.4+, SCDynamicStoreCopyLocalHostName() on older Mac OS, GetComputerName() on Win32, gethostname() everywhere else.

你可以当然，只需在Unix机器上调用 / bin / hostname ，或者在Windows上查看环境变量 COMPUTERNAME 。这是一种判断调用，你是否觉得更好地调用JNI或 exec 另一个程序。

You could, of course, simply call /bin/hostname on Unix machines or look at the environment variable COMPUTERNAME on Windows. It's sort of a judgement call as to whether you feel better calling JNI or execing another program.

对于什么它值得，我们在Mac OS上不调用 gethostname（）的原因是因为Mac做了一个奇怪的动态主机名，其中 gethostname（）将返回主以太网设备的反向DNS。如果我将我的Mac直接插入我的电缆调制解调器，我会得到一个主机名 customer-10-42-21-42 或我的有线电视提供商决定设置的任何内容作为我在他们的DNS中的PTR记录。相反，转到首选项会得到一个由用户确定的稳定主机名。

For what it's worth, the reason we don't call gethostname() on Mac OS is because Mac does a weird dynamic hostname thing, where gethostname() will return the reverse DNS of your primary ethernet device. If I were to plug my Mac straight into my cable modem, I'd get a hostname of customer-10-42-21-42 or whatever my cable provider decided to set as my PTR record in their DNS. Instead, going to the preferences will get you a stable hostname that was determined by the user.

这篇关于在最新的jdk7中，使用java获取主机名失败的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！