This article mainly introduces the installation of JDK 1.7 on Redhat Linux (Red Hat Enterprise Linux Server release 5.7 (Tikanga)) system. The installation of other Linux platforms is similar, and there may be slight differences.
Step 1: Download the JDK 1.7 installation package
JDK 1.7 download address: http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html
During the download process, you need to pay attention to two points:
1: Pay attention to the operating system version, and whether it is a 32-bit or 64-bit operating system. As shown below, Linux is divided into two types: x86 and x64.
| 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 |
2: Pay attention to whether the installation package is in rpm or tar.gz format. rpm is the redhat package, which is the standard installation package of Red Hat, and some Linux systems do not support it. It will be automatically configured during rpm installation. Generally, lib is installed to /urs/bin, and bin is installed to /usr/bin. If it is not installed to /urs/bin, a soft link will also be established in this directory.
Step 2: Upload the JKD 1.7 installation package
Under normal circumstances, you can use the FPT tool to upload and install the JDK installation package, because here I use a virtual machine for the experiment, this machine is Win 7 professional version 64-bit operating system, so you must ensure that you can access the files under Windows under Linux. Click "Options" - Shared Folders" under "Virtual Machine Settings", select "Always Enable", and then follow the wizard to set the folders you need to share. Then you can see the JKD file under /mnt/hgfs/ folder, copy the JKD installation package to the ~/tmp/ file.
[root@localhost ~]# cd /mnt/hgfs/
[root@localhost hgfs]# ls
JKD
[root@localhost hgfs]# cd JKD
[root@localhost JKD]# ls
jdk-7u25-linux-x64.rpm jdk-7u25-linux-x64.tar.gz
[root@localhost JKD]#
[root@localhost JKD]# cp jdk-7u25-linux-x64.rpm ~/tmp/
[root@localhost JKD]# cp jdk-7u25-linux-x64.tar.gz ~/tmp/
Step 3: Check whether other versions of JDK exist on the Linux system, and if so, uninstall the old version of JKD first.
[root@localhost /]# java -version
java version "1.4.2"
thou (GNU libgcj) version 4.1.2 20080704 (Red Hat 4.1.2-51)
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
View information about the built-in JDK
[root@getlnx06 ~]# rpm -qa | grep gcj
libgcj-4.1.2-51.el5
java-1.4.2-gcj-compat-1.4.2.0-40jpp.115
libgcj-4.1.2-51.el5
Information about uninstalling the built-in JDK
[root@localhost /]# rpm -e --nodeps java-1.4.2-gcj-compat-1.4.2.0-40jpp.115
Step 4: Unzip and install JDK
RPM package installation
[root@localhost tmp]# chmod +x jdk-7u25-linux-x64.rpm
[root@localhost tmp]# rpm -ivh jdk-7u25-linux-x64.rpm
Preparing... ########################################### [100%]
1:jdk ########################################### [100%]
Unpacking JAR files...
rt.jar...
jsse.jar...
charsets.jar...
tools.jar...
localedata.jar...
tar package installation
Create a new folder /usr/java/
[root@localhost usr]# mkdir java
[root@localhost usr]# cd ~/tmp
[root@localhost tmp]# tar xzvf jdk-7u25-linux-x64.tar.gz -C /usr/java/
Step 5: Configure Environment Variables
Add under etc/profile file
export JAVA_HOME=/usr/java/jdk1.7.0_25
export CLASSPATH=/usr/java/jdk1.7.0_25/lib
export PATH=$JAVA_HOME/bin:$PATH
If you don't want to restart the system, you can use the command source /etc/profile to make the configuration file take effect immediately. Otherwise, only restart the system to make the configuration parameters take effect.
[root@localhost ~]# source /etc/profile
Verify that environment variables are in effect
[root@localhost ~]# echo $JAVA_HOME
/usr/java/jdk1.7.0_25
[root@localhost ~]# 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
[root@localhost ~]# echo echo $CLASSPATH
/usr/java/jdk1.7.0_25/lib
[root@localhost ~]#
Step 6: Verify that the installation was successful and that the environment variables took effect
[root@localhost 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)
Step 7: Delete the JDK installation package in the tmp directory