yum -y install java-1.8.0-openjdk*
进入/usr/lib/jvm/目录下查看java-1.8.0-openjdk-1.8.0.275.b01-0.el7_9.x86_64
在配置文件中添加
vi /etc/profile
export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.275.b01-0.el7_9.x86_64
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar.:$JAVA_HOME/lib/dt.jar.:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin
激活
source /etc/profile