JDK offline installation, yum online installation and environment variable configuration under CentOS, taking JDK1.8 version as an example.
1. yum online installation
1. First search for resources in the yum library
yum search java | grep java-1.8
2. Execute the installation command
yum -y install java-1.8.0-openjdk
After the installation is complete, the default installation path is:
cd /usr/lib/jvm/
2. Configure environment variables
1. Edit the system configuration file
vim /etc/profile
2. Add at the end of the profile, JAVA_HOME below is the JDK folder
JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk
PATH=$JAVA_HOME/bin:$PATH
CLASSPATH=$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/jre/lib/ext
export PATH JAVA_HOME CLASSPATH
3. Install jdk offline
1. Download jdk-1.8.65
link: https://pan.baidu.com/s/1jeHae9blAjQsxlk2sGJEpA
extraction code: leov
2.Create a folder
mkdir /usr/rdc/java
cd /usr/rdc/java
And upload the downloaded installation file to this directory.
3. Unzip the installation package
tar -zxvf jdk-8u65-linux-x64.tar.gz
4. Configure environment variables.
See the previous article for details: 2. Configure environment variables.
The idea is that JAVA_HOME should be changed to: /usr/rdc/java/java1.8.65