Linux安装JDK

1.检查JDk是否已安装

[root@localhost local]# java -version

2.解压jdk-8u171-linux-x64.tar.gz包

[root@localhost local]# tar -zxvf jdk-8u171-linux-x64.tar.gz 
[root@localhost local]# mv jdk-8u171-linux-x64 /usr/local/jdk8

3.设置环境变量

[root@localhost local]# vim /etc/profile

在最前面添加：

export JAVA_HOME=/usr/local/jdk8
export JRE_HOME=${JAVA_HOME}/jre  
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib  
export  PATH=${JAVA_HOME}/bin:$PATH

4.执行profile文件

[root@localhost local]# source /etc/profile

5.检查新安装的jdk

[root@localhost local]# java -version

java version "1.8.0_171"
Java(TM) SE Runtime Environment (build 1.8.0_171-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.171-b11, mixed mode)