Centos8安装Oracle Jdk8

2020-02-27

怎样在centos系统里安装jdk，看这篇就够了~

卸载openjdk

判断是否安装了openjdk

1	rpm -qa \| grep openjdk

示例

[moxia@centos7 ~]$ rpm -qa | grep openjdk
java-1.8.0-openjdk-headless-1.8.0.242.b08-0.el7_7.x86_64
java-1.7.0-openjdk-headless-1.7.0.251-2.6.21.0.el7_7.x86_64
java-1.8.0-openjdk-1.8.0.242.b08-0.el7_7.x86_64
java-1.7.0-openjdk-1.7.0.251-2.6.21.0.el7_7.x86_64

如果安装了，卸载

yum -y remove java-1.8.0-openjdk-headless
yum -y remove java-1.7.0-openjdk-headless
yum -y remove java-1.8.0-openjdk
yum -y remove java-1.7.0-openjdk

安装oracle jdk

下载rpm或者tar.gz包

rpm或tar.gz包版本，任选其一安装，只是rpm版本不需要配置环境变量
链接：https://pan.baidu.com/s/1fLoBhVumXYoLnV37hnUZDg
提取码：xdfo

tar.gz包版本执行

1	sudo tar -zxvf jdk-8u241-linux-x64.tar.gz -C /usr/local/

rpm包版本执行

1	sudo rpm -ivh jdk-8u241-linux-x64.rpm

配置环境变量

编辑/etc/profile

1	vim /etc/profile

最下面加上配置

JAVA_HOME=/usr/local/jdk1.8.0_241
PATH=$JAVA_HOME/bin:$PATH
CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/lib/tools.jar
export PATH JAVA_HOME CLASSPATH

让配置立即生效

1	source /etc/profile

自动化脚本

把下面的代码保存成jdk.sh，与rpm包放在同一个目录，执行bash jdk.sh，可以自动配置环境变量。

#!/bin/bash
jdkpath=/usr/lib/java/
sudo mkdir $jdkpath
read -p "Please input the name of JDK file you downloaded: " jdkfile
sudo cp $jdkfile $jdkpath
cd $jdkpath
sudo tar xvf $jdkfile
sudo rm $jdkfile
dirname=`ls`
cd ~
echo "export JAVA_HOME=$jdkpath$dirname">>.bashrc
echo "export PATH=\$PATH:\$JAVA_HOME/bin:\$JAVA_HOME/jre/bin">>.bashrc
echo "export CLASSPATH=.:\$JAVA_HOME/lib:\$JAVA_HOME/jre/lib">>.bashrc
source ~/.bashrc

参考：
https://blog.csdn.net/zitong_ccnu/article/details/40041533
https://blog.csdn.net/java_faep/article/details/71252832
https://blog.csdn.net/guodongxiaren/article/details/36214453