Centos7.4安装JAVA

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1.检查本机是否安装过java

rpm -qa | grep java

2.检查本机是否安装过java

rpm -e --nodeps 系统自带jdk名

3.创建java目录

mkdir -p /usr/local/java

4.解压JDK

tar -zxvf /usr/local/jdk-8u162-linux-x64.tar.gz -C /usr/local/java

5.添加到 /etc/profile中

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

6.更新配置环境

source /etc/profile