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官网下载jdk
https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html -
全局环境变量的配置文件：vi /etc/profile
export JAVA_HOME=/usr/local/jdk1.8 #这个路径要改，其余不需要改
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH
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加载环境变量：source /etc/profile
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验证： java -version
java version "1.8.0_191"
Java(TM) SE Runtime Environment (build 1.8.0_191-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.191-b12, mixed mode)
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