Installing JDK on Linux operating system

Step 1: Download the JDK 1.7 installation package

JDK 1.7:http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html

There are two points to note during the download process:

1: note the operating system version, and the 32-bit or 64-bit operating system. As shown below, Linux is divided x86, x64 two kinds,

product/file Description	file Size	download
linux x86	80.38 MB	jdk-7u25-linux-i586.rpm
linux x86	93.12 MB	jdk-7u25-linux-i586.tar.gz
linux x64	81.46 MB	jdk-7u25-linux-x64.rpm
Linux x64	91.85 MB	Jdk-7u25-linux-x64.tar.gz

Step 2: Check if there are other versions of the JDK on the Linux system, and if so, uninstall the old version of JKD first.

[Email protected]/]# Java-versionjava version "1.4.2" gij (GNU libgcj) version 4.1.2 20080704 (Red Hat 4.1.2-51) Copyrigh T (C) 2006 free software Foundation, inc.this are free software; See the source for copying conditions. There is nowarranty; Not even to merchantability or FITNESS for A particular PURPOSE.

View information about your own JDK

[Email protected] ~]# Rpm-qa | grep Gcj[jdk][java]libgcj-4.1.2-51.el5java-1.4.2-gcj-compat-1.4.2.0-40jpp.115libgcj-4.1.2-51.el5

Uninstalling the information of your own JDK

[Email protected]/]# rpm-e--nodeps java-1.4.2-gcj-compat-1.4.2.0-40jpp.115

Step 3: unzip the installation JDK

RPM Package Installation

[Email protected] java]# chmod +x jdk-7u25-linux-x64.rpm[[email protected] java]# RPM-IVH Jdk-7u25-linux-x64.rpmpreparing ########################################### [100%]1:jdk ###################### ##################### [100%]unpacking JAR Files...rt.jar...jsse.jar...charsets.jar...tools.jar...localedata.jar ...

Tar Package Installation

Step 4: Configure environment variables

Add under the Etc/profile file

Export Java_home=/usr/java/jdk1.7.0_25export classpath=/usr/java/jdk1.7.0_25/libexport PATH= $JAVA _home/bin: $PATH

If you do not want to re-system, you can use the command source/etc/profile to make the configuration file effective immediately. Otherwise, the system can only be restarted for the configuration parameters to take effect.

[Email protected]]# Source/etc/profile

Verify that the environment variable is in effect

[Email protected] ~]# echo $JAVA _home/usr/java/jdk1.7.0_25[[email protected] ~]# echo $PATH/usr/java/jdk1.7.0_25/bin :/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/x11r6/ Bin:/root/bin[[email protected] ~]# echo Echo $CLASSPATH/usr/java/jdk1.7.0_25/lib[[email protected] ~]#

Step 5: Verify that the installation is successful, and that the environment variables are in effect

[Email protected] tmp]# java-version

Java Version "1.7.0_25"

Java (TM) SE Runtime Environment (build 1.7.0_25-b15)

Java HotSpot (TM) 64-bit Server VM (build 23.25-b01, Mixed mode)

Installing JDK on Linux operating system