# 安装jdk
mkdir /opt/java
cd /opt/java
# 去Java官网下载jdk
tar zxvf jdk-8u51-linux-x64.tar.gz
# 设置环境变量
echo "export JAVA_HOME=/opt/java/jdk1.8.0_51" >> /etc/profile
echo "export JRE_HOME=$JAVA_HOME/jre" >> /etc/profile
echo "export CLASSPATH=:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib" >> /etc/profile
echo "export PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin" >> /etc/profile
source /etc/profile
java -version
