设置Java DNS缓存TTL [英] Setting Java DNS cache TTL

问题描述

我正在尝试更改Java 1.6中的DNS缓存超时。我看到 here 使用某些内容如下：

I'm attempting to change the DNS cache timeout in Java 1.6. I see discussion here of using something like the following:

java.security.Security.setProperty ("networkaddress.cache.ttl" , TTL_SECS);

但是我在Win 7 ....中尝试过这个简单的测试。

But I've tried this simple test in Win 7....

System.out.println("DEFAULT DNS TTL: "+sun.net.InetAddressCachePolicy.get());
java.security.Security.setProperty ("networkaddress.cache.ttl" , "123");    
System.out.println("DEFAULT DNS TTL: "+sun.net.InetAddressCachePolicy.get());

...，输出不变。似乎这可以在Java安装的安全属性中进行更改，但我预先将其保留在代码中。任何想法如何实现？

... and the output doesn't change. It seems this can be changed in the Java installation's security properties but I preffer to keep this in the code for neatness. Any ideas how to achieve that?

谢谢。

推荐答案

这些不是系统属性：在java.security文件中设置。对于非首选的相应系统属性，请参阅网络属性。

These are not system properties: they are set in the java.security file. For the corresponding system properties, which are non-preferred, see 'Sun implementation-specific properties' in Networking Properties.

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