Install and set JAVA home on MAC OS with commandline

最近需要在MAC上做一些测试，由于测试机没有安装Java,只能自己安装，由于不能通过图形化界面访问测试机，只能通过命令行的形式来安装JAVA。

1. Download the jre/jdk install package from Oracle website,use hdiutil to mount the dmg file
　　sh-3.2# hdiutil mount  jre-7u55-macosx-x64.dmg
Checksumming Protective Master Boot Record (MBR : 0)?
Protective Master Boot Record (MBR :: verified   CRC32 $A63E199D
Checksumming GPT Header (Primary GPT Header : 1)?
 GPT Header (Primary GPT Header : 1): verified   CRC32 $12939AC9
Checksumming GPT Partition Data (Primary GPT Table : 2)?
GPT Partition Data (Primary GPT Tabl: verified   CRC32 $7832AB48
Checksumming  (Apple_Free : 3)?
                    (Apple_Free : 3): verified   CRC32 $00000000
Checksumming disk image (Apple_HFS : 4)?
.................................................................................................................................................................................
          disk image (Apple_HFS : 4): verified   CRC32 $7C0741DD
Checksumming  (Apple_Free : 5)?
                    (Apple_Free : 5): verified   CRC32 $00000000
Checksumming GPT Partition Data (Backup GPT Table : 6)?
GPT Partition Data (Backup GPT Table: verified   CRC32 $7832AB48
Checksumming GPT Header (Backup GPT Header : 7)?
  GPT Header (Backup GPT Header : 7): verified   CRC32 $8D5EC567
verified   CRC32 $6A86DC11
/dev/disk2          	GUID_partition_scheme          	
/dev/disk2s1        	Apple_HFS                      	/Volumes/Java 7 Update 55

2. Install the jre package
sh-3.2# installer -pkg '/Volumes/Java 7 Update 55/Java 7 Update 55.pkg' -target /
installer: Package name is Java 7 Update 55
installer: Installing at base path /
installer: The install was successful.

3. Use the following command to check java home

/usr/libexec/java_home

4. Set java home if necessary

export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.7.0_60.jdk/Contents/Home 
export PATH=$JAVA_HOME/bin:$PATH