CentOS7/Ubuntu Linux java jdk 环境变量配置

 [root@localhost sony]# tar -zxvf jdk-8u121-linux-x64.tar.gz
 [root@localhost sony]# cp -r jdk1..0_121 /usr/local/
 [root@localhost sony]# vi /etc/profile

 最底部添加

 JAVA_HOME=/usr/local/jdk1..0_121
 CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
 PATH=$JAVA_HOME/bin:$PATH
 export JAVA_HOME CLASS_PATH PATH

 [root@localhost sony]# source /etc/profile
 [root@localhost sony]# java -version
 java version "1.8.0_121"
 Java(TM) SE Runtime Environment (build 1.8.0_121-b13)
 Java HotSpot(TM) -Bit Server VM (build 25.121-b13, mixed mode)

ubuntu

sudo gedit /etc/profile

export JAVA_HOME=/home/test/jdk1..0_162
export CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH

source /etc/profile