premise
The installation of the current user is root
Download the installation package
Now oracle official website to download jdk need to log in before you can download, so download the installation package is too much trouble.
download link:
http://www.oracle.com/technetwork/java/javase/downloads/index.html
I downloaded this version
jdk-8u241-linux-x64.tar.gz
Clear default jdk
### to see if there is a default installation of the JDK
RPM -qa | grep the Java RPM -qa | grep the JDK RPM -qa | grep gcj ### if you use the batch uninstall command RPM -qa | grep the Java | xargs RPM -e - -nodeps
Create a java directory
mkdir -p /usr/java/ && cd /usr/java/
File Upload
### can use rz command, no command install, very easy to use file upload tool
yum install - the y-lrzsz
enter rz press Enter to bring up the file selection window.
Decompression
tar -zxvf jdk-8u241-linux-x64.tar.gz
Configuration environment variable
VI / etc / Profile
The following configuration is added to the end (Command mode: file Shift + G command to skip to the end of the file), then save and exit.
Java8 #
Export JAVA_HOME . = / Usr / the Java / jdk1 8 .0_241
Export the PATH = $ JAVA_HOME / bin: $ the PATH
It makes the configuration take effect
source /etc/profile
Verifying the Installation
java -version
Remove the installation package
### save resources
RM -rf / usr / the Java / the JDK-8u241-Linux-x64. Tar .gz
Other installation (RPM)
###创建目录
mkdir -p /home/software/ && cd /home/software/
###上传安装包
使用 rz 命令工具
###赋权
chmod 777 jdk-8u241-linux-x64.rpm
###安装（默认安装路径 /usr/java）
rpm -ivh jdk-8u241-linux-x64.rpm
###配置环境变量（请参考前面的设置）