1. Upload the JDK package
The JDK package can be downloaded from the official website: Java Downloads | Oracle
uploads the JDK package to the specified path on the server, such as: /home/tool
2. Unzip JDK
tar -zxvf jdk-8u251-linux-x64.tar.gz
# 修改文件名
mv jdk1.8.0_251 jdk
3. Configure JDK environment variables
edit global variables
vim /etc/profile
Paste the following in the last line of text:
#java environment
export JAVA_HOME=/home/tool/jdk
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin
Note: JAVA_HOME=/home/tool/jdk is configured according to the actual directory
Set environment variables to take effect
source /etc/profile
4. Check whether the installation is successful
java -version
If the version information is displayed normally, it is successful