＃解压jdk7

tar -zxvf jdk-7u79-linux-x64.tar.gz

＃解压jdk8

tar -zxvf jdk-8u131-linux-x64.tar.gz

＃修改jdk文件夹名称

mv jdk1..0_79 jdk7

＃修改jdk8文件夹名称

mv jdk1..0_131 jdk8

mkdir jvm

mv jdk7 jvm/

mv jdk8 jvm/

＃在jvm目录下执行

vim jdk_toggle.sh

＃声明jdk7和jdk路径变量

JAVA_7_HOME=/usr/local/jvm/jdk7

JAVA_8_HOME=/usr/local/jvm/jdk8

＃执行脚本传入的值进行判断。默认是jdk8

case $ in

    jdk7)

        export JAVA_HOME=$JAVA_7_HOME

        ;;

    jdk8)

        export JAVA_HOME=$JAVA_8_HOME

        ;;

    *)

        export JAVA_HOME=$JAVA_8_HOME

        ;;

esac

export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH

export CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib

＃在jvm目录下

#切换到jdk7

source jdk_toggle.sh jdk7

＃切换到jdk8

source jdk_toggle.sh jdk8