Install JDK and configure environment variables on Linux

JDK download address:

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

Choose 64-bit or 32-bit download according to the version of Linux system , the official now provides rpm and tar.gz versions for download.

Installation:

[root@oracle cdrom]# rpm -ivh jdk-8u25-linux-x64.rpm

Configure jdk environment variables

Method 1: Set variables under Shell (this method Only valid for the current shell, if you open another shell, you need to reconfigure it)

export JAVA_HOME=/usr/java/jdk1.7.0_40/
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$ JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

(It is also OK if you only configure export PATH=/usr/java/jdk1.7.0_40/bin:$PATH)

Method 2: Modify the /etc/profile file (this method is once and for all, set once and is valid for all users)

Open the /etc/profile file with the vim editor and add the definition of environment variables at the end of the file

JAVA_HOME=/usr/java/jdk1 .8.0_25/

PATH=$JAVA_HOME/bin:$PATH

CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export JAVA_HOME
export PATH
export CLASSPATH

Save Exit and check the java version

[root@oracle cdrom]# java -version

java version "1.8.0_25"

Java(TM) SE Runtime Environment (build 1.8.0_25-b17)

Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)

means the installation is successful

Method 3: Modify the ~/.bashrc file (this method is only effective for the current user after modification, and all shells of this user will be affected) Valid)

Open the ~/.bashrc file with the vim editor

Add the definition of the jdk environment variable at the end of the file

set JAVA_HOME=/usr/java/jdk1.8.0_25/

export JAVA_HOME

set PATH=$ JAVA_HOME/bin:$PATH

export PATH

set CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

export CLASSPATH

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