How to install jdk under centos

The specific method is as follows:

1. Uninstall the OpenJDK and related java files that come with the system

1. Type in the command window:

rpm -qa | grep java

2. Delete the original java file and type in the command window:

rpm -e --nodeps java-1.7.0-openjdk-1.7.0.111-2.6.7.8.el7.x86_64 
rpm -e --nodeps java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64 
rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64 
rpm -e --nodeps java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64

3. Check whether the deletion has been successful

java -version

(recommended tutorial: centos tutorial)

2. Download the latest stable JDK

1. The download address is

http:// www.oracle.com/technetwork/java/javase/archive-139210.html

2. After the download is complete, copy the JDK compressed package to /usr/local/src/ for backup

cp jdk-8u144-linux-x64.tar.gz /usr/local/src/

Note: Modify the permissions of the JDK compressed file before copying.

Type in the command line:

chmod 755 jdk-8u144-linux-x64.tar.gz

3. Unzip JDK

1. Type in the command window:

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

2. Delete the JDK compressed package

Type in the command line:

rm -f jdk-8u144-linux-x64.tar.gz

4. Configure JDK environment variables

1. Edit global variables

Type in the command line:

vi /etc/profile

2. Add the following text:

#java environment
export JAVA_HOME=/usr/java/jdk1.8.0_144
export CLASSPATH=.:${JAVA_HOME}/jre/lib/rt.jar:${JAVA_HOME}/lib/dt.jar:$ {JAVA_HOME}/lib/tools.jar
export PATH=$PATH:${JAVA_HOME}/bin

5. Let the environment variables just set take effect and check whether the installation is successful

1. Make the environment variables just set take effect.

Type:

source /etc/profile

2. Check whether the configuration is successful.

Type:

java -version

Recommended related video tutorials: linux video tutorial

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