Install JDK and environment configuration under Linux

Preface

Java Development Kit (JDK) is Sun's (acquired by Oracle) software development kit for Java developers. Since the introduction of Java, JDK has become the most widely used Java SDK (Software development kit) 

Official website  https://www.oracle.com/index.html

 

installation steps

1. Download the source code

   https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html 

   Link:  https://pan.baidu.com/s/1e0oNzoj1aYPB0Ucl0fG6Ew   Password: 8ifh   

   Download and upload to the server root directory /opt

2. Unzip the source code

tar -zxvf jdk-8u144-linux-x64.tar.gz 

3. Configure environment variables

vi /etc/profile

  Press i in English input state to enter insert mode, add the following configuration  

export JAVA_HOME=/opt/jdk1.8.0_144
export CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH

  Press esc to enter  : wq to  save and exit, compile /etc/profile to make the configuration effective

source /etc/profile

4. Verify that the installation is successful

java -version

  If a version number appears, it means success!