Install jdk on centos and set Environment Variables

Install jdk on centos and set Environment Variables
JDK installation of CentOS

• Download JDK 1.8

• At this time (20170324) the latest version:jdk-8u72-linux-x64.tar.gz

• Official Website: http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

• OpenJDK is installed in CentOS by default. We recommend that you uninstall it first.

• Check the JDK command:Java-version

• Query the local JDK installation program;rpm -qa|grep java

  • The result is as follows:

  java-1.6.0-openjdk-1.6.0.38-1.13.10.0.el6_7.x86_64java-1.7.0-openjdk-1.7.0.95-2.6.4.0.el6_7.x86_64tzdata-java-2015g-2.el6.noarch

  • Unmount the preceding three files (--nodepsPurpose: Ignore the dependency check ):
  • sudo rpm -e --nodeps java-1.6.0-openjdk-1.6.0.38-1.13.10.0.el6_7.x86_64
  • sudo rpm -e --nodeps java-1.7.0-openjdk-1.7.0.95-2.6.4.0.el6_7.x86_64
  • sudo rpm -e --nodeps tzdata-java-2015g-2.el6.noarch
  • You can also uninstall it together:sudo rpm -e --nodeps java-1.6.0-openjdk-1.6.0.38-1.13.10.0.el6_7.x86_64 java-1.7.0-openjdk-1.7.0.95-2.6.4.0.el6_7.x86_64 tzdata-java-2015g-2.el6.noarch
  • For CentOS 7:sudo rpm -e --nodeps javapackages-tools-3.4.1-11.el7.noarch java-1.8.0-openjdk-1.8.0.121-0.b13.el7_3.x86_64 java-1.7.0-openjdk-headless-1.7.0.131-2.6.9.0.el7_3.x86_64 python-javapackages-3.4.1-11.el7.noarch java-1.7.0-openjdk-1.7.0.131-2.6.9.0.el7_3.x86_64 java-1.8.0-openjdk-headless-1.8.0.121-0.b13.el7_3.x86_64 tzdata-java-2017a-1.el7.noarch

• Install JDK 1.8

  • We installjdk-8u72-linux-x64.tar.gzExample
  • My personal habits/optCreate a directory under the DirectorysetupsUsed to store various software installation packages;/usrCreateprogramUsed to store various decompressed software packages. The following sections are based on this habit.
  • I personally have used the third-party source:EPEL、RepoForgeIf you appearyum install XXXXXIf the installation fails, it is likely that you have no relevant source. Please refer to my article on source settings.
  • Unzip the installation package:sudo tar -zxvf jdk-8u72-linux-x64.tar.gz
  • Move the package to the installation directory that I am used:mv jdk1.8.0_72/ /usr/program/
  • Configure environment variables:
    • Edit the configuration file:Sudo vim/etc/profile or sudo vim/etc/profile. d/java. sh (recommended for Management)
    • Add the following content to the tail of the file:

    # JDKJAVA_HOME=/usr/program/jdk1.8.0_72JRE_HOME=$JAVA_HOME/jrePATH=$PATH:$JAVA_HOME/binCLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jarexport JAVA_HOMEexport JRE_HOMEexport PATHexport CLASSPATH

    • Run the following command to refresh the Configuration ):Source/etc/profile or. java. sh
    • Check whether the latest JDK is used:java -version