1下载安装java
jdk6:https://support.apple.com/kb/DL1572?locale=zh_CNapache
2配置环境变量tomcat
open .bash_profilebash
export PATH=$PATH:/usr/local/apache-tomcat-7.0.79/bin
export JAVA_6_HOME=/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
export JAVA_7_HOME=/Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk/Contents/Home
export JAVA_8_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Homeapp
#设置默认的jdk版本spa
export JAVA_HOME=$JAVA_8_HOME orm
#设置alias 用于切换get
alias jdk8='export JAVA_HOME=$JAVA_8_HOME'
alias jdk7='export JAVA_HOME=$JAVA_7_HOME'
alias jdk6='export JAVA_HOME=$JAVA_6_HOME'io保存退出变量
source .bash_profile
3 切换jdk
输入 jdk6,再输入java -version 查看当前版本便可实现动态切换,jdk7,jdk8一样。