卸载自带Java
rpm -qa | grep -i java |xargs -n1 rpm -e --nodeps
安装JDK的tar.gz包以后，解压，进入/etc/profile目录并且配置环境变量
export JAVA_HOME=/opt/jdk1.8.0_333 export PATH=$PATH:$JAVA_HOME/bin:$JAVA_HOME/jre/bin export CLASSPATH=$CLASSPATH:.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
