blocks|key|424026|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|424027|InetAddress+old+=+InetAddress.getLocalHost();
while(true)+{
++++InetAddress+new+=+InetAddress.getLocalHost();
++++if(!old.toString().equals(new.toString()))+{
++++++++System.out.println("IP+has+changed+to:+"+%2B+new.toString());
++++++++System.out.println("IP+was:+"+%2B+old.toString());
++++++++old+=+new;
++++}
}|code-block|syntax|javascript|424028|您应该在独立线程中运行此循环，并将(True)更改为布尔字段，您可以从线程外部管理该字段。|424029|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Try this: 

<pre><code>InetAddress old = InetAddress.getLocalHost();
while(true) {
 InetAddress new = InetAddress.getLocalHost();
 if(!old.toString().equals(new.toString())) {
 System.out.println("IP has changed to: " + new.toString());
 System.out.println("IP was: " + old.toString());
 old = new;
 }
}
</code></pre>

You should run this loop within a seperate Thread and change while(true) into a boolean field which you can manage from outside the thread

blocks|key|4416696|text|Linux的特定方式:编写一个shell脚本来监视syslog最近的更改。提取IP地址，如果从syslog(/var/log/syslog)中有任何更改，或者u可以有条不紊地使用run+ifconfig并比较id，则IP地址中有任何漏洞。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4416697|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Linux specific way: Write a shell script to monitor syslog for recent changes. Extract IP address if there is any change from syslog(/var/log/syslog) or u can use run ifconfig perodically and compare id there is any chage in IP address.

blocks|key|2754620|text|您可以使用此工具生成Java程序获取的触发器：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2754621|http://sourceforge.net/projects/ipmonitor/|offset|length|2754622|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|16|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

You can use this tool to generate a trigger that get's picked up by your Java program:

<a href="http://sourceforge.net/projects/ipmonitor/" rel="nofollow">http://sourceforge.net/projects/ipmonitor/</a>

blocks|key|2754680|text|我认为你在没有投票的情况下不会这么做的。问题是，在一般情况下，机器可能有几个IP，这使事情变得复杂。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2754681|假设您对用于连接到某个已知位置(例如一些内部服务器或简单的"www.google.com")的IP感兴趣，那么打开该位置的套接字并调用socket.getLocalAddress()是最简单的方法。这将始终返回正确的IP地址。这个解决方案是跨平台的，易于实现，但是如果你真的不需要这种连接的话，就有点尴尬了。|offset|length|style|CODE|2754682|另一种方法是解析操作系统的路由表(在linux上运行route+-en+)。这不需要外部连接，但需要(有时是复杂的)解析。|2754683|第三种更简洁的获取当前IP地址的方法是here。但是，当程序运行在一个具有多个公共ip的机器上，或者一个具有多个私有地址而没有公共地址的机器上时，就会出现问题。使用这种方法，在这种情况下，您最终会猜测IP，而且您可能并不总是正确的。但是，如果您知道要监视哪个地址，或者知道接口名称，这是目前为止最好的解决方案。|2754684|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/9482369/3199595^0|0|1V|O|0|Q|9|0|J|4|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@$D|V|E|W|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|X|8|@$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|J|3|K|5|6|7|10|8|@]|9|@$D|11|E|12|1|13]]|A|$]]|$1|L|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]]]

I don't think you do it without polling. The problem is that in the general case, the machine might have several IPs, which complicates things.

Assuming you're interested in the IP used to connect to some known location (e.g. some internal server or just plainly "www.google.com"), the easiest way it to open a socket to that location and call <code>socket.getLocalAddress()</code>. That will always return the correct IP address. This solution is cross platform and easy to implement, but kinda awkward if you don't really need that connection.

Another approach is parsing the operating system's routing table (on linux run <code>route -en</code>. This doesn't require external connections, but does require (sometimes intricate) parsing. 

A third, cleaner, approach of getting the current IP address is outlined <a href="https://stackoverflow.com/a/9482369/3199595">here</a>. But it's problematic when the program runs on a machine with more than one public ip, or one which has multiple private addresses and no public ones. With this approach, you end up guessing the IP in such cases, and you might not always be right. But if you know which address you want to monitor, or know the interface name, this is by far the best solution.

Is there a way to receive notification in Java when IP address changes?

For example when the machine receives a new address from a dhcp server. I would like to avoid polling as the machine is already under heavy load. From what I found so far it seems impossible.

Something that works in pure java would be best but a linux specific way would be fine too.

Edit: I should have mentioned that the IP address is that of the local machine, not some remote server. Ie. I would like to receive notification when the IP address of the machine where the java program is running is changed.

Receive notification when IP address changes

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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有什么方法在IP地址改变时用Java接收通知吗？例如，当机器从dhcp服务器接收到新地址时。我想避免轮询，因为机器已经承受了很重的负荷。从我目前的发现来看，这似乎是不可能的。在纯java中工作的东西最好，但是linux特定的方式也可以。编辑:我应该提到IP地址是本地机器的地址，而不是远程服务器的地址。即。当正在运行ja...

问IP地址更改时接收通知
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