直接yum安装jdk

yum install JAVA -1.8.0-openjdk-devel.x86_64

在/etc/profile添加如下配置

JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.275.b01-0.el7_9.x86_64

PATH=$PATH:$JAVA_HOME/bin

CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

export JAVA_HOME CLASSPATH PATH