Three ways to install JDK under CentOS#

Due to the different Linux development vendors, the operating details of the Linux version of different development vendors are different. Today, let's talk about the installation of JDK under CentOS:

Method 1: Manually decompress the JDK compressed package, and then set the environment variable##

Create a java directory under the /usr/ directory

[ root@localhost ~]# mkdir/usr/java
[ root@localhost ~]# cd /usr/java

Download jdk, then unzip

[ root@localhost java]# curl -O http://download.Oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.tar.gz
[ root@localhost java]# tar -zxvf jdk-7u79-linux-x64.tar.gz

Set environment variables

[ root@localhost java]# vi /etc/profile

Add the following content to the profile:

set java environment

JAVA_HOME=/usr/java/jdk1.7.0_79
JRE_HOME=/usr/java/jdk1.7.0_79/jre
CLASS_PATH=.:JAVA_HOME/lib/dt.jar:JAVA_HOME/lib/tools.jar:JRE_HOME/lib PATH=PATH:JAVA_HOME/bin:JRE_HOME/bin
export JAVA_HOME JRE_HOME CLASS_PATH PATH

Let the changes take effect:

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

Verify the validity of the JDK

[ root@localhost java]# java -version
java version "1.7.0_79"
Java(TM) SE Runtime Environment (build 1.7.0_79-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)

Method 2: Install JDK with yum

Check which jdk versions are in the yum library (only openjdk is found for the time being)

[ root@localhost ~]# yum search java|grep jdk
ldapjdk-javadoc.x86_64 : Javadoc for ldapjdk
java-1.6.0-openjdk.x86_64 : OpenJDK Runtime Environment
java-1.6.0-openjdk-demo.x86_64 : OpenJDK Demos
java-1.6.0-openjdk-devel.x86_64 : OpenJDK Development Environment
java-1.6.0-openjdk-javadoc.x86_64 : OpenJDK API Documentation
java-1.6.0-openjdk-src.x86_64 : OpenJDK Source Bundle
java-1.7.0-openjdk.x86_64 : OpenJDK Runtime Environment
java-1.7.0-openjdk-demo.x86_64 : OpenJDK Demos
java-1.7.0-openjdk-devel.x86_64 : OpenJDK Development Environment
java-1.7.0-openjdk-javadoc.noarch : OpenJDK API Documentation
java-1.7.0-openjdk-src.x86_64 : OpenJDK Source Bundle
java-1.8.0-openjdk.x86_64 : OpenJDK Runtime Environment
java-1.8.0-openjdk-demo.x86_64 : OpenJDK Demos
java-1.8.0-openjdk-devel.x86_64 : OpenJDK Development Environment
java-1.8.0-openjdk-headless.x86_64 : OpenJDK Runtime Environment
java-1.8.0-openjdk-javadoc.noarch : OpenJDK API Documentation
java-1.8.0-openjdk-src.x86_64 : OpenJDK Source Bundle
ldapjdk.x86_64 : The Mozilla LDAP Java SDK

Select the version and install it

//Select version 1.7 to install
[ root@localhost ~]# yum install java-1.7.0-openjdk
//After installation, the default installation directory is: /usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75.x86_64

Set environment variables

[ root@localhost ~]# vi /etc/profile

Add the following content in the profile file

set java environment

JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75.x86_64
JRE_HOME=JAVA_HOME/jre CLASS_PATH=.:JAVA_HOME/lib/dt.jar:JAVA_HOME/lib/tools.jar:JRE_HOME/lib
PATH=PATH:JAVA_HOME/bin:$JRE_HOME/bin
export JAVA_HOME JRE_HOME CLASS_PATH PATH

Let the changes take effect

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

Verification (same method as above)

Method 3: Install JDK with rpm

Download the rpm installation file

[ root@localhost ~]$ curl -O http://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.rpm

Install using rpm command

[ root@localhost ~]# rpm -ivh jdk-7u79-linux-x64.rpm

Set environment variables

[ root@localhost java]# vi /etc/profile

Add the following content to the opened profile file

set java environment

Let the changes take effect

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

Verification (same method as above)

Note: Similar to yum installation, you can run java commands without setting environment variables. The rpm installation method will install jdk to /usr/java/jdk1.7.0_79 by default, and then link to /usr/bin through a three-layer link, the specific link is as follows:

[ root@localhost ~]# cd /bin
[ root@localhost bin]# ll|grep java
lrwxrwxrwx. 1 root root 25 Mar 28 11:24 jar ->/usr/java/default/bin/jar
lrwxrwxrwx. 1 root root 26 Mar 28 11:24 java -> /usr/java/default/bin/java
lrwxrwxrwx. 1 root root 27 Mar 28 11:24 javac ->/usr/java/default/bin/javac
lrwxrwxrwx. 1 root root 29 Mar 28 11:24 javadoc ->/usr/java/default/bin/javadoc
lrwxrwxrwx. 1 root root 28 Mar 28 11:24 javaws ->/usr/java/default/bin/javaws
lrwxrwxrwx. 1 root root 30 Mar 28 11:24 jcontrol ->/usr/java/default/bin/jcontrol
[ root@localhost bin]# cd /usr/java/
[ root@localhost java]# ll
total 4
lrwxrwxrwx. 1 root root 16 Mar 28 11:24 default-> /usr/java/latest
drwxr-xr-x. 8 root root 4096 Mar 28 11:24 jdk1.7.0_79
lrwxrwxrwx. 1 root root 21 Mar 28 11:24 latest -> /usr/java/jdk1.7.0_79

Method 4: Use apt-get to install JDK on Ubuntu

Check which jdk versions are available in the apt library

root@linuxidc:~# apt-cache search java|grep jdk
default-jdk - Standard Java or Java compatible Development Kit
default-jdk-doc - Standard Java or Java compatible Development Kit (documentation)
gcj-4.6-jdk - gcj and classpath development tools for Java(TM)
gcj-jdk - gcj and classpath development tools for Java(TM)
openjdk-6-dbg - Java runtime based on OpenJDK (debugging symbols)
openjdk-6-demo - Java runtime based on OpenJDK (demos and examples)
openjdk-6-doc - OpenJDK Development Kit (JDK) documentation
openjdk-6-jdk - OpenJDK Development Kit (JDK)
openjdk-6-jre-lib - OpenJDK Java runtime (architecture independent libraries)
openjdk-6-source - OpenJDK Development Kit (JDK) source files
openjdk-7-dbg - Java runtime based on OpenJDK (debugging symbols)
openjdk-7-demo - Java runtime based on OpenJDK (demos and examples)
openjdk-7-doc - OpenJDK Development Kit (JDK) documentation
openjdk-7-jdk - OpenJDK Development Kit (JDK)
openjdk-7-source - OpenJDK Development Kit (JDK) source files
uwsgi-plugin-jvm-openjdk-6 - Java plugin for uWSGI (OpenJDK 6)
uwsgi-plugin-jwsgi-openjdk-6 - JWSGI plugin for uWSGI (OpenJDK 6)
openjdk-6-jre - OpenJDK Java runtime, using Hotspot JIT
openjdk-6-jre-headless - OpenJDK Java runtime, using Hotspot JIT (headless)
openjdk-7-jre - OpenJDK Java runtime, using Hotspot JIT
openjdk-7-jre-headless - OpenJDK Java runtime, using Hotspot JIT (headless)
openjdk-7-jre-lib - OpenJDK Java runtime (architecture independent libraries)

Select version to install

root@linuxidc:~# apt-get install openjdk-7-jdk

Set environment variables

root@linuxidc:~# vi /etc/profile

Add the following content to the opened profile file

set java environment

JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-amd64
JRE_HOME=JAVA_HOME/jre CLASS_PATH=.:JAVA_HOME/lib/dt.jar:JAVA_HOME/lib/tools.jar:JRE_HOME/lib
PATH=PATH:JAVA_HOME/bin:$JRE_HOME/bin
export JAVA_HOME JRE_HOME CLASS_PATH PATH

Let the changes take effect

root@linuxidc:~# source /etc/profile

Verification (same method as above)

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Install JDK1.8.0_25 and configure environment variables on Ubuntu 14.04 http://www.linuxidc.com/Linux/2015-01/112030.htm

Install Oracle JDK 1.8 on Ubuntu 14.04 LTS http://www.linuxidc.com/Linux/2014-11/109216.htm

CentOS6.3 install JDK and environment configuration http://www.linuxidc.com/Linux/2012-09/70780.htm

Install JDK8 on Ubuntu 14.04 http://www.linuxidc.com/Linux/2014-09/106218.htm

Install JDK graphic analysis under Ubuntu http://www.linuxidc.com/Linux/2014-09/107291.htm

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