Install JDK and configure environment variables on Ubuntu 16.04
System version: Ubuntu 16.04
JDK version: jdk1.8.0_121
- Download the JDK file jdk-8u121-linux-x64.tar.gz from the official website
I have the latest version here, other versions are also available
- Create a directory as the JDK installation directory, my directory is /java
sudo mkdir /java
- Move the file to the /java directory
sudo mv jdk-8u121-linux-x64.tar.gz /java
- unzip files
tar -zxvf jdk-8u121-linux-x64.tar.gz
- Configure environment variables
sudo gedit /etc/environment
Add the following configuration at the end (the path after JAVA_HOME is the file location of jdk)
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:$JAVA_HOME/bin"export CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
export JAVA_HOME=/java/jdk1.8.0_121
Save and close after modification, and enter the following command to make the environment variable take effect immediately
source /etc/environment
- Enter java -version, the JDK version description is displayed. Congratulations, the environment variables are configured correctly
- But it's not over yet. According to articles written by other people, I found that it can't be used after every restart, so you need to configure environment variables for all users
sudo gedit /etc/profile
Add the following at the end of the file:
# set Java environment
export JAVA_HOME=/dengyang/jdk1.8.0_56
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH
- Similarly, you need to use commands to make environment variables take effect immediately
source /etc/profile
- Restart the computer, you can enter the system normally, and the java -version command is valid
Reprinted from: http://www.linuxidc.com/Linux/2017-02/140908.htm
Recommended Posts