Installing JDK1.7 under CentOS

1. installation Package Preparation:

First download the jdk,http://www.oracle.com/technetwork/java/javase/downloads/website jdk7-downloads-1880260.html, I download jdk-7u45-linux-x64.tar.gz, download to home directory

2. Unzip the source package

Create a new Java folder from the terminal in the/usr/local directory, command line:

sudo mkdir/usr/local/java

Then copy the download to the archive into the Java folder, the command line:

Enter the directory where the JDK source package resides

CP Jdk-7u45-linux-x64.tar.gz/usr/local/java

Then go to the Java directory, command line:

Cd/usr/local/java

Unzip the Tarball, command line:

sudo tar xvf jdk-7u45-linux-x64.tar.gz

You can then delete the compressed package, command line:

sudo 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.

sudo 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.

and then save

Source/etc/profile

Make profile effective

4, check whether the installation is successful

In the terminal

Java-version

See if the installation is successful

Success shows the following

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 JDK1.7 under CentOS