CentOS7.3下JDK 1.8安装配置

1.
920d
检查已安装版本

java -version

rpm -qa | grep java

rpm -e --nodeps 需要删除的版本

或者sudo yum remove java

2.官网下载
http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
Linux x64
jdk-8u144-linux-x64.tar.gz

3.解压缩改名放到/usr/local

sudo mv jdk-8u144-linux-x64.tar.gz jdk

sudo cp -R jdk /usr/local

4.配置环境变量

sudo vi /etc/profile

在末尾添加

export JAVA_HOME=/usr/local/jdk

export JRE_HOME=/usr/local/jdk/jre

export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib:$CLASSPATH

export PATH=$JAVA_HOME/bin:$PATH

然后source /etc/profile

使配置生效

5.验证安装

java -version