CentOS7安装JDK1.8

①cd /opt/java
②tar -zxf jdk-8u301-linux-x64.tar.gz
③解压后配置环境变量(普通用户)
vim .bash_profile

export JAVA_HOME=/opt/java/jdk1.8.0_181
export PATH= J A V A H O M E / b i n : JAVA_HOME/bin: JAVAH​OME/bin:PATH
export CLASSPATH=.: J A V A H O M E / l i b / d t . j a r : JAVA_HOME/lib/dt.jar: JAVAH​OME/lib/dt.jar:JAVA_HOME/lib
④验证：java -version
[majd@crm-yy-test ~]$ java -version
java version “1.8.0_301”
Java™ SE Runtime Environment (build 1.8.0_301-b09)
Java HotSpot™ 64-Bit Server VM (build 25.301-b09, mixed mode)

①yum搜索jdk安装包
yum search java | grep jdk
②下载jdk1.8
yum install java-1.8.0-openjdk
下载后的默认路径为/usr/lib/jvm
③配置环境变量(同上)
④验证

①下载rpm安装包
②安装rpm包
rpm -ivh jdk-8u181-linux-x64.rpm…
③配置环境变量
④验证