CentOS 7 安裝Oracle JDK1.8

$ mkdir -p /opt/Java
$ cd /opt/Java
# 上傳JDK軟件包 jdk-8u221-linux-x64.tar.gz
$ tar -zxvf jdk-8u221-linux-x64.tar.gz
$ rm -rf jdk-8u221-linux-x64.tar.gz
$ vim /etc/profile.d/java.sh
export JAVA_HOME=/opt/Java/jdk1.8.0_221
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$JAVA_HOME/bin:$PATH
$ source /etc/profile.d/java.sh
$ java -version
java version "1.8.0_221"
Java(TM) SE Runtime Environment (build 1.8.0_221-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.221-b11, mixed mode)