在MAC上查找和设置$JAVA_HOME

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最近升级了MAC OS，装了JDK7 for mac，在这里下载JDK7 for mac，装完之后发现在默认的路径下找不到JDK7的HOME，如下所示：
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$ which java  /usr/bin/java  $ ls -l /usr/bin/java  lrwxr-xr-x  1 root  wheel  74 Jan  4 20:24 /usr/bin/java -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java  $ ls -l /System/Library/Frameworks/JavaVM.framework/Versions  total 64  lrwxr-xr-x  1 root  wheel   10 Jan  4 20:24 1.4 -> CurrentJDK  lrwxr-xr-x  1 root  wheel   10 Jan  4 20:24 1.4.2 -> CurrentJDK  lrwxr-xr-x  1 root  wheel   10 Jan  4 20:24 1.5 -> CurrentJDK  lrwxr-xr-x  1 root  wheel   10 Jan  4 20:24 1.5.0 -> CurrentJDK  lrwxr-xr-x  1 root  wheel   10 Jan  4 20:24 1.6 -> CurrentJDK  lrwxr-xr-x  1 root  wheel   10 Jan  4 20:24 1.6.0 -> CurrentJDK  drwxr-xr-x  7 root  wheel  238 Jan  4 20:25 A  lrwxr-xr-x  1 root  wheel    1 Jan  4 20:24 Current -> A  lrwxr-xr-x  1 root  wheel   59 Jan  4 20:24 CurrentJDK -> /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents

可是查看java的版本确实是1.7，如下：
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$ java -version  java version "1.7.0_45"  Java(TM) SE Runtime Environment (build 1.7.0_45-b18)  Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)

google了一下，发现了这篇文章Important Java Directories on Mac OS X，可以使用工具命令“/usr/libexec/java_home”来定位JAVA_HOME，这下爽了：
Shell代码收藏代码

$ cat ~/.profile  JAVA_HOME=`/usr/libexec/java_home`  export JAVA_HOME  $ echo $JAVA_HOME  /Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home

另外可以使用-V选项列出所有版本的JAVA_HOME：
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$ /usr/libexec/java_home -V  Matching Java Virtual Machines (3):      1.7.0_45, x86_64:   "Java SE 7" /Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home      1.6.0_65-b14-462, x86_64:   "Java SE 6" /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home      1.6.0_65-b14-462, i386: "Java SE 6" /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home  /Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home

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