linux 安装 jdk

tar xzf  jdk-8u131-linux-x64.tar.gz

vi /etc/profile

export JAVA_HOME=/usr/local/java/jdk1.8.0_131
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin

#配置文件立即生效
source  /etc/profile