系统版本
[root@localhost ~]# cat /etc/redhat-release CentOS Linux release 7.8.2003 (Core)1
直接yum安装1.8.0版本openjdk
yum install java-1.8.0-openjdk* -y
环境变量配置
#临时生效
export JAVA_HOME=/usr/lib/jvm/<span style="font-family: Arial;">jre-1.8.0-openjdk-1.8.0.121-0.b13.el7_3.x86_64</span>
#当前用户生效的配置
vim ~/.bashrc #在文件底部加入下面一句 export JAVA_HOME=/usr/lib/jvm/jre-1.8.0-openjdk-1.8.0.161-0.b14.el7_4.x86_6412
#如果使所有用户生效的配置
vim /etc/profile #set java environment export JAVA_HOME=/usr/lib/jvm/java export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/jre/lib/rt.jar export PATH=$PATH:$JAVA_HOME/bin123456
使配置文件生效
. /etc/profile
#查看变量
[root@localhost ~]# echo $JAVA_HOME /usr/lib/jvm/jre-1.8.0-openjdk-1.8.0.161-0.b14.el7_4.x86_64 [root@localhost ~]# echo $CLASSPATH .:/usr/lib/jvm/jre-1.8.0-openjdk-1.8.0.161-0.b14.el7_4.x86_64/lib/dt.jar:/usr/lib/jvm/jre-1.8.0-openjdk-1.8.0.161-0.b14.el7_4.x86_64/lib/tools.jar12345
