Install and configure JDK 8 in CentOS 7

Install and configure JDK 8 in CentOS 7

Installation instructions

System Environment: CentOS 7
Installation Method: rpm Installation
Software: jdk-8u25-linux-x64.rpm
: Http://www.Oracle.com/technetwork/java/javase/downloads/index.html

Recommendation: install Java JDK 8 in CentOS 7/6. 5/6. 4.

Check the original system version
[Root @ zck ~] # Java-version
Java version "1.7.0 _"
OpenJDK Runtime Environment (IcedTea6 1.11.1) (rhel-1.45.1.11.1.el6-x86_64)
OpenJDK 64-Bit Server VM (build between 0-b12, mixed mode)

To further view the JDK information:
[Root @ localhost ~] # Rpm-qa | grep java
Javapackages-tools-3.4.1-6.el7_0.noarch
Tzdata-java-2014i-1.el7.noarch
Java-1.7.0-openjdk-headless-1.7.0.71-2.5.3.1.el7_0.x86_64
Java-1.7.0-openjdk-1.7.0.71-2.5.3.1.el7_0.x86_64
Python-javapackages-3.4.1-6.el7_0.noarch

 

Uninstall OpenJDK and perform the following operations:
[Root @ localhost ~] # Rpm-e -- nodeps tzdata-java-2014i-1.el7.noarch
[Root @ localhost ~] # Rpm-e -- nodeps java-1.7.0-openjdk-headless-1.7.0.71-2.5.3.1.el7_0.x86_64
[Root @ localhost ~] # Rpm-e -- nodeps java-1.7.0-openjdk-1.7.0.71-2.5.3.1.el7_0.x86_64

 

Install JDK

Upload new jdk-8u25-linux-x64.rpm software to/usr/local/to perform the following operations:
[Root @ zck local] # rpm-ivh jdk-8u25-linux-x64.rpm

JDK is installed in/usr/java by default.

Verify Installation

Perform the following operations to check whether the information is normal:
[Root @ localhost ~] # Java
[Root @ localhost ~] # Javac
[Root @ localhost ~] # 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)

Configure Environment Variables

After installing the jdk-7-linux-x64.rpm on my machine, I can still perform the javac and java-version operations without configuring environment variables, so I didn't configure JDK environment variables. However, for future discomfort, we should record how to configure it as follows:
Modify the system environment variable File
Vi +/etc/profile

Append the following content to the file:
JAVA_HOME =/usr/java/jdk1.8.0 _ 25
JRE_HOME =/usr/java/jdk1.8.0 _ 25/jre
PATH = $ PATH: $ JAVA_HOME/bin: $ JRE_HOME/bin
CLASSPATH =.: $ JAVA_HOME/lib/dt. jar: $ JAVA_HOME/lib/tools. jar: $ JRE_HOME/lib
Export JAVA_HOME JRE_HOME PATH CLASSPATH

Make the modification take effect
[Root @ localhost ~] # Source/etc/profile // make the modification take effect immediately
[Root @ localhost ~] # Echo $ PATH // view the PATH value

View system environment status
[Root @ localhost ~] # Echo $ PATH
/Usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin: /usr/java/jdk1.8.0 _ 25/bin:/usr/java/jdk1.8.0 _ 25/jre/bin

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