如何检查是否通过Cocoa安装了Java 7版本？
[英]How to check if Java 7 version is installed via Cocoa?
问题描述
I have an Cocoa Xcode application that I am writing and I need to check what Java versions are installed on the user's machine. 
我有一个我正在编写的Cocoa Xcode应用程序，我需要检查用户机器上安装的Java版本。 I know I can check /System/Library/Frameworks/JavaVM.framework/Versions/ and see what folders exist; 我知道我可以查看/System/Library/Frameworks/JavaVM.framework/Versions/并查看存在哪些文件夹; however, this does not work for Java 7. 但是，这对Java 7不起作用。
When I installed Java 7 on my Mac OS X 10.7.5, it was installed to /Library/Internet Plugins/JavaAppletPlugin.plugin . 当我在Mac OS X 10.7.5上安装Java 7时，它被安装到/Library/Internet Plugins/JavaAppletPlugin.plugin 。 But this doesn't let me know the version of Java that is installed. 但这并不让我知道安装的Java版本。 If a newer version of Java is installed, I'm assuming it will install to the same place. 如果安装了较新版本的Java，我假设它将安装到同一个地方。
If I need to test if Java 7+ JRE is installed on the user's machine, should I just check if the file /Library/Internet Plugins/JavaAppletPlugin.plugin exists? 如果我需要测试用户机器上是否安装了Java 7+ JRE，我应该检查文件/Library/Internet Plugins/JavaAppletPlugin.plugin存在？ Is there a better way to check? 有更好的检查方法吗？
1 个解决方案
解决方案1
2 已采纳 2013-06-06 01:23:56
Although you may have installed Java 7, you should have installed the Apple's Java Mac OS X 2012-006 update before. 虽然您可能已经安装了Java 7，但您之前应该已经安装了Apple的Java Mac OS X 2012-006更新。 Having done that (and then installed java 7 again), java -version should tell you java version "1.7.x..." 完成后（再安装java 7），java -version应该告诉你java版“1.7.x ......”
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