Installing JDK1.7 under CentOS

1, source Package preparation:

First download the JDK to the official website, i download jdk-7u55-linux-i586.tar.gz, download to the home directory

2. Unzip the source package

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

[Email protected] ~]# 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

[email protected] ~]# CP Jdk-7u45-linux-x64.tar.gz/usr/local/java

Then go to the Java directory, command line:

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

Unzip the Tarball, command line:

[Email protected] java]# tar xvf jdk-7u45-linux-x64.tar.gz

You can then delete the compressed package, command line:

[Email protected] java]# 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.

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

After opening, add at the end

Export java_home=/usr/local/java/jdk1.7. 0_55export jre_home=/usr/local/java/jdk1.7.0_55/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

[Email protected] ~]# 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

[Email protected] java]# java-"1.7.0_79"OpenJDK Runtime Environment (Rhel-2.5.5.4.el6-i386 u79-  24.79-b02, mixed mode, sharing)

Installing JDK1.7 under CentOS