问题描述
我仅在工作中使用Mac，我需要将JAVA_HOME设置为JDK的正确路径.我下载了JDK，进行了安装，但现在在任何地方都找不到它.我在互联网上寻找解决方案，但是没有文件夹Libraries/Java.
Im using Mac only at work and I need to set JAVA_HOME to proper path of JDK. I downloaded JDK, installed it and now I can't find it anywhere. I was looking at the internet for the solution, but there is no folder Libraries/Java.
推荐答案
位置已从Java 6(由Apple提供)更改为Java 7及更高版本(由Oracle提供).找出此问题的最佳 generic 方法是运行
The location has changed from Java 6 (provided by Apple) to Java 7 and onwards (provided by Oracle). The best generic way to find this out is to run
/usr/libexec/java_home
这是一种本机支持的方法，可以找到默认Java安装的路径以及所有现有的替代安装路径.
This is the natively supported way to find out both the path to the default Java installation as well as all alternative ones present.
如果签出帮助文本(java_home -h)，将会看到可以使用此命令在OS X(java_home --exec ...)上可靠地启动Java程序，并能够显式指定所需的Java.版本和体系结构，甚至在缺少时要求用户安装它.
If you check out its help text (java_home -h), you'll see that you can use this command to reliably start a Java program on OS X (java_home --exec ...), with the ability to explicitly specify the desired Java version and architecture, or even request the user to install it if missing.
一种更加行人的方法，但是它将帮助您专门跟踪命令java解析到的Java安装，如下所示:
A more pedestrian approach, but one which will help you trace specifically which Java installation the command java resolves into, goes like this:
-
运行
run
which java
如果您得到类似/usr/bin/java之类的东西，它是指向实际位置的符号链接，请运行
if that gives you something like /usr/bin/java, which is a symbolic link to the real location, run
ls -l `which java`
在我的系统上，此输出
/usr/bin/java -> /Library/Java/JavaVirtualMachines/jdk1.7.0_25.jdk/Contents/Home/bin/java
从那里您可以读取Java主目录；
and therefrom you can read the Java home directory;
如果usr/bin/java指向另一个符号链接，则以递归方式应用相同的方法
if usr/bin/java points to another symbolic link, recursively apply the same approach with
ls -l <whatever the /usr/bin/java symlink points to>
一个重要的变化是，如果您先安装Apple的Java，然后再安装Oracle的，则将获得设置.在这种情况下，上面的步骤2将为您提供
An important variation is the setup you get if you start by installing Apple's Java and later install Oracle's. In that case Step 2 above will give you
/usr/bin/java -> /System/Library/Frameworks/JavaVM.framework/Commands/java
和那个特定的java二进制文件是一个存根，它将通过查询JAVA_HOME环境变量来解析实际的java命令以进行调用，如果未设置或未指向Java主目录，它将回退到调用java_home.调试设置时，请记住这一点，这一点很重要.
and that particular java binary is a stub which will resolve the actual java command to call by consulting the JAVA_HOME environment variable and, if it's not set or doesn't point to a Java home directory, will fall back to calling java_home. It is important to have this in mind when debugging your setup.
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