Configuration of Java environment variables under Ubuntu

Configuration of Java environment variables under Ubuntu

Reprinted on April 20, 2017 13:41:13

• Label:
• ubuntu /
• java environment variable

 

Reprinted from and modified from: https://jingyan.baidu.com/article/c33e3f48a3365dea15cbb5c9.html l

1. Download JDK on Oracle's official website: I downloaded jdk-8u131-linux-i586.tar.gz

2. Create the Java folder

usr/lib/jvm　 Jdk folder after decompression will be placed in this directory

Use the command in the terminal:　 sudo mkdir /usr/lib/jvm 

3. decompress

First copy the downloaded tar.gz file to home/, then decompress home/jdk-8u131-linux-i586.tar.gz to usr/lib/jvm

Use the command:　sudo tar -C /usr/lib/jvm -xzf xx.tar.gz

You can see if the decompression process is ok

4. Check if there is java optional on this machine

Use the command: sudo update-alternatives --list java

Normal display　No java optional

5. Configure environment variables

Use the command:　sudo gedit ~/.bashrc

Add at the end of the opened file:

 

export JAVA_HOME=/usr/lib/jvm/jdk1.8.0_131 (path to the unzipped jdk folder)   

export JRE_HOME=${JAVA_HOME}/jre  

export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib  

export PATH=${JAVA_HOME}/bin:$PATH

 

Except for the first variable that needs to be modified, all others can be copied.

6. make the configuration take effect

Use the command:　source    ~/.bashrc

7. Verify that the environment variables are configured successfully

rsion

There is jdk version information, indicating that the configuration is successful!