centos7安装jdk8

mkdir /usr/local/java
#将jdk安装包上传到/usr/local/java目录下

tar -zxvf jdk-8u321-linux-x64.tar.gz -C /usr/local/java
vim /etc/profile
#添加内容
    JAVA_HOME=/usr/local/java/jdk1.8.0_321
    JRE_HOME=/usr/local/java/jdk1.8.0_321/jre
    CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
    PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
    export JAVA_HOME JRE_HOME CLASS_PATH PATH
    
 source /etc/profile
 java -version