获取OracleJDK
以Java SE Development Kit 8u221为例，下载地址如下：
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| https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
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解压到目录
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| tar zxvf jdk-8u151-linux-x64.tar.gz -C /usr/jdk
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配置环境变量
编辑/etc/profile文件，在最后添加如下内容：
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| export JAVA_HOME=/usr/jdk/jdk1.8.0_151
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH
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验证结果
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| source /etc/profile
java -version
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java version “1.8.0_151”
Java(TM) SE Runtime Environment (build 1.8.0_151-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.151-b12, mixed mode)