安装JDK

1、下载JDK

JDK官网：https://www.oracle.com
JDK下载地址：https://www.oracle.com/java/technologies/downloads/archive/
JDK8下载地址：https://www.oracle.com/java/technologies/javase/javase8-archive-downloads.html

2、安装JDK

]# tar zvfx ./jdk-8u162-linux-x64.tar.gz -C /usr/local/

]# cd /usr/local/
]# ln -s jdk1.8.0_162 jdk

3、配置JDK的环境变量

//(1)向/etc/profile文件中添加如下配置
]# vim /etc/profile
export JAVA_HOME=/usr/local/jdk
export JRE_HOME=/usr/local/jdk/jre
export PATH=${JAVA_HOME}/bin:${JRE_HOME}/bin:${PATH}
export CLASSPATH=::${JAVA_HOME}/lib/dt.jar:${JAVA_HOME}/lib/tools.jar

//(2)使配置生效
]# source /etc/profile

4、验证JDK是否已经安装配置成功

//如果安装配置成功，则会正确显示出JDK的版本信息
]# java -version
java version "1.8.0_162"
Java(TM) SE Runtime Environment (build 1.8.0_162-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.162-b12, mixed mode)

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