CentOS 安装JDK

一、下载和解压JDK

https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

二、设置环境变量

vi /etc/profile

在profile中添加如下内容：

#set java environment
JAVA_HOME=/home/java/jdk1.8.0_172
JRE_HOME=/home/java/jdk1.8.0_172/jre
CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
export JAVA_HOME JRE_HOME CLASS_PATH PATH

让配置文件生效：

source /etc/profile

三、验证

java -version

java version "1.8.0_172"
Java(TM) SE Runtime Environment (build 1.8.0_172-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.172-b11, mixed mode)