JDK6、JDK7、JDK8三个版本的汇总地址：https://pan.baidu.com/s/1pKSYv8Z

安装

JDK6安装

JDK6下载地址

见网盘

安装完毕后确认版本

JavaForOSX2014-001.dmg contains Javafor Mac OS X (1.6.0_65-b14-462).It will be installed to * /System/Library/Java * and /System/Library/Frameworks while Oracle Java is located at /Library/Java

>cd /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home

>./bin/java -version

java version "1.6.0_65"

Java(TM) SE Runtime Environment (build 1.6.0_65-b14-466.1-11M4716)

Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-466.1, mixed mode)

JDK7安装

JDK7下载地址

安装完毕后确认版本

JDK7之后，安装目录比较规范化了，按着版本号在/Library/Java/JavaVirtualMachines/下自动建立子目录

/Library/Java/JavaVirtualMachines>ls -lrt

total 0

drwxr-xr-x 3 root wheel 102 11 2 15:22 jdk1.7.0_67.jdk

drwxr-xr-x 3 root wheel 102 11 3 14:58 jdk1.7.0_71.jdk

drwxr-xr-x 3 root wheel 102 4 9 13:44 jdk1.8.0_40.jdk5

JDK8安装

安装和下载同JDK7

每次安装完后，自动更新/usr/libexec/java_home

/Users/lcz>/usr/libexec/java_home

/Library/Java/JavaVirtualMachines/jdk1.8.0_40.jdk/Contents/Home

配置多JDK版本环境

修改profile文件

1.打开~/.bash_profile，没有的话创建

vim ~/.bash_profile

2.在文件中写入，保存、退出

export JAVA_6_HOME=/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home

export JAVA_7_HOME=/Library/Java/JavaVirtualMachines/jdk1.7.0_71.jdk/Contents/Home

export JAVA_8_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_40.jdk/Contents/Home

alias jdk6="export JAVA_HOME=$JAVA_6_HOME" #编辑一个命令jdk6，输入则转至jdk1.6

alias jdk7="export JAVA_HOME=$JAVA_7_HOME" #编辑一个命令jdk8，输入则转至jdk1.8

alias jdk8="export JAVA_HOME=$JAVA_8_HOME" #编辑一个命令jdk8，输入则转至jdk1.8

export JAVA_HOME=`/usr/libexec/java_home` #最后安装的版本，这样当自动更新时，始终指向最新版本

验证

/Users/lcz>. .bash_profile

/Users/lcz>java -version

java version "1.8.0_40"

Java(TM) SE Runtime Environment (build 1.8.0_40-b27)

Java HotSpot(TM) 64-Bit Server VM (build 25.40-b25, mixed mode)

/Users/lcz>jdk6

/Users/lcz>java -version

java version "1.6.0_65"

Java(TM) SE Runtime Environment (build 1.6.0_65-b14-466.1-11M4716)

Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-466.1, mixed mode)

/Users/lcz>jdk7

/Users/lcz>java -version

java version "1.7.0_71"

Java(TM) SE Runtime Environment (build 1.7.0_71-b14)

Java HotSpot(TM) 64-Bit Server VM (build 24.71-b01, mixed mode)

【补充jdk1.8命令安装】

Brew下载并安装JDK1.8

brew cask search java

brew caskinstall java

java -version