Conditions: jdk installed, if not installed see here: Linux (Centos7 system) installed JDK, Tomcat, Mysql
Proceed as follows:
linux, the environment variable is modified files in / etc / profile in
vi / etc / profile
If no environment variables, please join in the final environment variable, the following is my path:
After entering the file, press 'i' key, enter the edit state;
JAVA_HOME=/usr/lib/jvm/java-1.8.0 PATH=$JAVA_HOME/bin:$PATH CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar export JAVA_HOME export PATH export CLASSPATH
// add the above code, directly or ESC ctrl + C, enter: wq (colon), Enter to save on the line
Then just load the environment variable configuration, the command is as follows:
source /etc/profile
JDK verify whether the installation is successful, the command line, enter
java -version
Enter, if printed out JDK version, OK!
