Installing JDK under CentOS

1, source Package preparation:

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

2. Unzip the source package

Unpack the Tarball:

# tar XVF jdk-7u45-linux-x64.tar.gz

To delete a compressed package:

# RM jdk-7u45-linux-x64.tar.gz

3. Setting the JDK environment variable

The global setting method here is to modify Etc/profile, which is a common environment variable for all users.

# Gedit/etc/profile

After opening, add at the end:

Export Java_home=/usr/local/java/jdk1.7.0_45export Jre_home=/usr/local/java/jdk1.7.0_45/jreexport CLASSPATH=.:$ Java_home/lib/dt.jar: $JAVA _home/lib/tools.jar: $JRE _home/lib: $CLASSPATHexport path= $JAVA _home/bin: $PATH

Keep in mind that during the add-on process, do not add a space on either side of the equal sign, or "not a valid identifier", because the Source/etc/profile does not recognize the extra space and is understood to be part of the path.

To make the profile effective:

#/etc/profile

4, check whether the installation is successful

# java-version

Success is shown as follows:

Java version "1.7.0_45" Java (tm) SE Runtime Environment (build 1.7.0_45-b18) Java HotSpot (tm) 64-bit Server VM (Build 24.45- B08, Mixed mode)

Installing JDK under CentOS