java命令行在Mac上需要JDK吗? [英] java command line requires JDK on Mac?

问题描述

我已经从Oracle官方站点在MacOS X 10.10上安装了JRE 1.8.我安装的文件是jre-8u66-macosx-x64.dmg.令我惊讶的是，java命令说我需要JDK才能工作.

I've installed JRE 1.8 on MacOS X 10.10 from the official Oracle site. The file I've installed was jre-8u66-macosx-x64.dmg. To my surprise, the java command says I need JDK for it to work.

有没有一种方法可以在Mac上不使用JDK的情况下从命令行执行jar?如果没有，那有什么运行Java代码的选项(浏览器小程序除外)?

Is there a way to execute a jar from the command line on Mac without JDK? If not, what options for running Java code are there (other than browser applets)?

从命令行调用java -v时，我得到以下输出:

when invoking java -v from the command line, I get the following output:

不存在Java运行时，要求安装.

No Java runtime present, requesting install.

和一个警告窗口，其中显示:

and an alert window, which says:

要使用"java"命令行工具，您需要安装JDK.

To use the "java" command-line tool you need to install a JDK.

另一个数据点:/Library/Java/JavaVirtualMachines文件夹为空.相反，在/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home下有一些内容.它甚至在/bin/下有一个命令行java.用-version运行它可以得到:

One more data point: the folder /Library/Java/JavaVirtualMachines is empty. Instead, there's stuff under /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home. It even has a command-line java under /bin/. Running it with -version gives:

java version "1.8.0_66"
Java(TM) SE Runtime Environment (build 1.8.0_66-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.66-b17, mixed mode)

我想知道我是否可以以某种方式将其用于CLI.

I wonder if I can somehow leverage that one for CLI..

推荐答案

如果重新安装不能解决问题，则可以将$ JAVA_HOME设置为java的安装位置:

In the case a re-install does not fix the problem, you could set $JAVA_HOME to the location java is installed:

export JAVA_HOME=/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home

之后，java -v应该可以工作，但是您必须为每个新的终端窗口执行此操作，或者根据您使用的外壳将其添加到.bash_profile或其他文件中.

After that, java -v should work, but you'll have to do it for every new terminal window, or add it to .bash_profile or other file depending on the shell you use.

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