Installing JDK under Linux

Method One: Manually install the JDK installation package, configure the environment variables

1. Create a Java directory under the/usr/directory

[Email protected] ~]# mkdir/usr/~]# Cd/usr/java

2. Download and unzip the installation package

[[email protected] java]# Curl-o http://[[email protected] java]# TAR-ZXVF jdk-7u79-linux-x64.tar.gz

3. Setting Environment variables

[Email protected] java]# Vi/etc/profile

Enter VI edit mode, add the following code:

#Set  java environmentjava_home=/usr/java/jdk1. 7 . 0_79jre_home=/usr/java/jdk1. 7. 0_79/Jreclass_path=.: $JAVA _home/lib/dt.jar: $JAVA _home/lib/tools.jar: $JRE _home/LibPATH = $PATH: $JAVA _home/bin: $JRE _home/binexport java_home jre_home class_path PATH

Let the changes take effect:

[Email protected] java]# Source/etc/profile

4. Verification

[Email protected] java]# java-"1.7.0_79"1.7. 0_79-   - 24.79-b02, Mixed mode)

Method Two: Install the JDK with Yum (CentOS)

1. See which JDK versions are available in the Yum Library

[email protected] ~]# Yum search java|grep jdkldapjdk-javadoc.x86_64:javadoc forLdapjdkjava-1.6.0-Openjdk.x86_64:OpenJDK Runtime Environmentjava-1.6.0-openjdk-Demo.x86_64:OpenJDK Demosjava-1.6.0-openjdk-Devel.x86_64:OpenJDK Development Environmentjava-1.6.0-openjdk-Javadoc.x86_64:OpenJDK API Documentationjava-1.6.0-openjdk-Src.x86_64:OpenJDK Source Bundlejava-1.7.0-Openjdk.x86_64:OpenJDK Runtime Environmentjava-1.7.0-openjdk-Demo.x86_64:OpenJDK Demosjava-1.7.0-openjdk-Devel.x86_64:OpenJDK Development Environmentjava-1.7.0-openjdk-Javadoc.noarch:OpenJDK API Documentationjava-1.7.0-openjdk-Src.x86_64:OpenJDK Source Bundlejava-1.8.0-Openjdk.x86_64:OpenJDK Runtime Environmentjava-1.8.0-openjdk-Demo.x86_64:OpenJDK Demosjava-1.8.0-openjdk-Devel.x86_64:OpenJDK Development Environmentjava-1.8.0-openjdk-Headless.x86_64:OpenJDK Runtime Environmentjava-1.8.0-openjdk-Javadoc.noarch:OpenJDK API Documentationjava-1.8.0-openjdk-Src.x86_64:OpenJDK Source Bundleldapjdk.x86_64:The Mozilla LDAP Java SDK

2. Select version, install

[email protected] ~]# Yum install java-1.7. 0-openjdk

Note: The default installation directory is in:/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75.x86_64

3. Setting Environment Variables

[Email protected] ~]# Vi/etc/profile

Enter VI edit model, add:

#Set  java environmentjava_home=/usr/lib/jvm/java-1.7. 0-openjdk-1.7. 0.75 . X86_64jre_home= $JAVA _home/jreclass_path=.: $JAVA _home/lib/dt.jar: $JAVA _home/lib/tools.jar:$ jre_home/LibPATH= $PATH: $JAVA _home/bin: $JRE _home/binexport java_home jre_home class_path PATH

Let the changes take effect:

[Email protected] java]# Source/etc/profile

3. Verification, Ibid.

Method Three: Install the JDK with rpm

1. Download

[Email protected] ~]$ Curl-o http://download.oracle.com/otn-pub/java/jdk/7u79-b15/ jdk-7u79-linux-x64.rpm

2. Installing using the RPM command

[Email protected]  ~]# rpm-ivh jdk-7u79-linux-x64.rpmpreparing ...               ########################################### [%]  1: JDK                    ######## ###################################[]unpacking JAR files ...       Rt.jar ...       Jsse.jar ...       Charsets.jar ...       Tools.jar ...       Localedata.jar ... Jfxrt.jar ...

3. Setting Environment variables

[Email protected] java]# Vi/etc/profile

Go to VI Edit and add:

#Set  java environmentjava_home=/usr/java/jdk1. 7 . 0_79jre_home=/usr/java/jdk1. 7. 0_79/Jreclass_path=.: $JAVA _home/lib/dt.jar: $JAVA _home/lib/tools.jar: $JRE _home/LibPATH = $PATH: $JAVA _home/bin: $JRE _home/binexport java_home jre_home class_path PATH

Let the changes take effect:

[Email protected] java]# java-"1.7.0_79"1.7. 0_79-   - 24.79-b02, Mixed mode)

Method Four: Install JDK on Ubuntu using Apt-get

1. See which JDK versions are available in the APT library

[Email protected]:~# apt-cache Search java|grep jdkdefault-JDK-Standard Java or Java compatible development Kitdefault-jdk-doc-Standard Java or Java Compatible development Kit (documentation) GCJ-4.6-JDK-GCJ and Classpath Development tools forJava (TM) gcj-JDK-GCJ and Classpath Development tools forJava (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) documentationopenjdk-6-JDK-OpenJDK Development Kit (JDK) OpenJDK-6-jre-lib-OpenJDK Java Runtime (architecture Independent libraries) OpenJDK-6-source-OpenJDK Development Kit (JDK) source Filesopenjdk-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) documentationopenjdk-7-JDK-OpenJDK Development Kit (JDK) OpenJDK-7-source-OpenJDK Development Kit (JDK) source Filesuwsgi-plugin-jvm-openjdk-6-Java Plugin forUwsgi (OpenJDK6) Uwsgi-plugin-jwsgi-openjdk-6-Jwsgi Plugin forUwsgi (OpenJDK6) OpenJDK-6-JRE-OPENJDK Java Runtime,usingHotspot jitopenjdk-6-JRE-HEADLESS-OPENJDK Java Runtime,usingHotspot JIT (headless) openjdk-7-JRE-OPENJDK Java Runtime,usingHotspot jitopenjdk-7-JRE-HEADLESS-OPENJDK Java Runtime,usingHotspot JIT (headless) openjdk-7-JRE-LIB-OPENJDK Java Runtime (architecture Independent libraries)

2. Select a version to install

[Email protected]:~# apt-get install openjdk-7-jdk

3. Setting Environment variables

[Email protected]:~# vi/etc/profile

Add the following content:

#Set  java environmentjava_home=/usr/lib/jvm/java-1.7. 0-openjdk-amd64jre_home= $JAVA _home/jreclass_path=.: $JAVA _home/lib/dt.jar: $JAVA _home /lib/tools.jar: $JRE _home/LibPATH= $PATH: $JAVA _home/bin: $JRE _home/binexport java_homejre_home Class_ Path Path

Let the changes take effect:

[Email protected]:~# source/etc/profile

4. Verification

[Email protected]:~# java-"1.7.0_79"2.5. 5) (7u79-2.5.  5-0ubuntu0. 12.04. 1  24.79-b02, Mixed mode)

Installing JDK under Linux