我应该如何在 macOS 上设置 JAVA_HOME 环境变量？
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How should I set the JAVA_HOME environment variable on macOS?
提问by Marco Dinatsoli
I know this question has been asked a lot before but i did read and i will show you what i got.
我知道这个问题以前被问过很多次，但我确实读过，我会告诉你我得到了什么。
I will list the commands that i did in my OS X Yosemite 10.10.1
我将列出我在OS X Yosemite 10.10.1中执行的命令
java -version
版本
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)
java -fullversion
java -fullversion
java full version "1.8.0_45-b14"
which java
哪个java
/usr/bin/java
Java home variable is not set because when I do this: echo $java_homeor echo $JAVA_HOMEor echo $Java_Homei got nothing on the terminal.
Java home 变量未设置，因为当我这样做时：echo $java_home或echo $JAVA_HOME或echo $Java_Home我在终端上什么也没有。
when doing this: ls -l which javai got this:
这样做时： ls -lwhich java我得到了这个：
8 lrwxr-xr-x 1 root wheel 74 Nov 12 2014 /usr/bin/java -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java
javac -version
javac -version
javac 1.8.0_45
/usr/libexec/java_home
/usr/libexec/java_home
/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home
The solution that I think is correct after reading on internet is
我在网上阅读后认为正确的解决方案是
echo "export JAVA_HOME=`/usr/libexec/java_home`" >> ~/.profile
but i am afraid to test it, that is why i am asking you, if that is correct or not and if not what should i do please?
但我害怕测试它，这就是为什么我问你，如果这是否正确，如果不正确，我该怎么办？
采纳答案by ntalbs
I'm not sure why you are afraid to test, you can safely test this:
我不确定你为什么害怕测试，你可以安全地测试这个：
In your terminal session, input the following:
在终端会话中，输入以下内容：
echo "export JAVA_HOME=`/usr/libexec/java_home`"
This will print the following line:
这将打印以下行：
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home
Copy the above and paste it into your terminal window, then press enter key. and execute java -versionto see it work correctly. If everything is okay, you can attach the code into your .profile:
复制上面的内容并将其粘贴到您的终端窗口中，然后按回车键。并执行java -version以查看它是否正常工作。如果一切正常，您可以将代码附加到您的.profile：
But adding this line directly is better idea because you don't have to update .profilewhen you upgrade JDK.
但是直接添加这一行是更好的主意，因为您.profile在升级JDK时不必更新。
export JAVA_HOME=`/usr/libexec/java_home`
Please refer to the man page for the java_hometool. In short, it provides the appropriate path for JAVA_HOME for a normal installation on macOS
请参阅java_home工具的手册页。简而言之，它提供了 JAVA_HOME 的适当路径，以便在 macOS 上正常安装
