在MAC上查找和设置$JAVA_HOME
$ /usr/libexec/java_home -VMatching 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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