Linux安装jdk

vim /etc/profile

#末尾加
#set java environment
export JAVA_HOME=/usr/java/jdk/jdk1.8.0_112
export JRE_HOME=/usr/java/jdk/jdk1.8.0_112/jre
export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$JAVA_HOME:$PATH

source /etc/profile