[Excellent] complete steps for installing JDK in Linux: Share with linuxjdk

[Excellent] complete steps for installing JDK in Linux: Share with linuxjdk
Environment preparation: Operating System: Centos6.9 java installation package: jdk-8u162-linux-x64.tar.gz

1. Check the jdk version in the system.

[root@localhost software]# java -version

Display:

openjdk version "1.8.0_102"OpenJDK Runtime Environment (build 1.8.0_102-b14)OpenJDK 64-Bit Server VM (build 25.102-b14, mixed mode)

2. Check the jdk installation package

[root@localhost software]# rpm -qa | grep java

Display:

java-1.7.0-openjdk-1.7.0.111-2.6.7.8.el7.x86_64python-javapackages-3.4.1-11.el7.noarchtzdata-java-2016g-2.el7.noarchjavapackages-tools-3.4.1-11.el7.noarchjava-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64

3. Uninstall openjdk

[root@localhost software]# rpm -e --nodeps tzdata-java-2016g-2.el7.noarch[root@localhost software]# rpm -e --nodeps java-1.7.0-openjdk-1.7.0.111-2.6.7.8.el7.x86_64[root@localhost software]# rpm -e --nodeps java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64[root@localhost software]# rpm -e --nodeps java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64[root@localhost software]# rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64

Or use

[root@localhost jvm]# yum remove *openjdk*

Enter rpm-qa | grep java again to check the uninstallation status:

[root@localhost software]# rpm -qa | grep javapython-javapackages-3.4.1-11.el7.noarchjavapackages-tools-3.4.1-11.el7.noarch

4. Install the new jdk

First, go to the jdk official website to download the desired jdk version. After the download is complete, put the jdk installation package to the folder specified by the Linux system and run the command to enter the folder:

[root@localhost software]# lltotal 252664-rw-r--r--. 1 root root  11830603 Jun  9 06:43 alibaba-rocketmq-3.2.6.tar.gz-rw-r--r--. 1 root root  43399561 Jun  9 06:42 apache-activemq-5.11.1-bin.tar.gz-rwxrw-rw-. 1 root root 185540433 Apr 21 09:06 jdk-8u131-linux-x64.tar.gz-rw-r--r--. 1 root root   1547695 Jun  9 06:44 redis-3.2.9.tar.gz-rw-r--r--. 1 root root  16402010 Jun  9 06:40 zookeeper-3.4.5.tar.gz

Unzip the jdk-8u131-linux-x64.tar.gz installation package

[root@localhost software]# mkdir -p /usr/lib/jvm[root@localhost software]# tar -zxvf jdk-8u131-linux-x64.tar.gz -C /usr/lib/jvm

5. Set Environment Variables

[root@localhost software]# vim /etc/profile

Add at the beginning:

export JAVA_HOME=/home/java/jdk1.8.0_162  export JRE_HOME=${JAVA_HOME}/jre  export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib  export  PATH=${JAVA_HOME}/bin:$PATH

6. Run the profile file.

[root@localhost software]# source /etc/profile

This allows the configuration to take effect immediately without restarting.

7. Check the newly installed jdk

[root@localhost software]# java -version

Display:

java version "1.8.0_131"Java(TM) SE Runtime Environment (build 1.8.0_131-b11)Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)

The entire installation process ends.