JDK环境变量设置

1. Windows

JAVA_HOME=C:\Program Files\Java\jdk1.8.0_191
CLASSPATH=.;%JAVA_HOME%\lib;%JAVA_HOME%\lib\tools.jar
PATH=%JAVA_HOME%\bin;%JAVA_HOME%\jre\bin;

1. Linux

vi /etc/profile.d/jdk.sh

export JAVA_HOME=/usr/local/java/jdk1.8.0_191
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

3. 使jdk.sh生效

source /etc/profile.d/jdk.sh