Install and configure JDK-7 in Linux CentOS 6.5

Install and configure JDK-7 in Linux CentOS 6.5

System Environment: CentOS-6.5
Installation Method: rpm Installation
Software: jdk-7-linux-i586.rpm
: Http://www.Oracle.com/technetwork/java/javase/downloads/index.html

Check the original system version
[Root @ localhost ~] # Java-version
Java version "1.7.0 _ 24"
OpenJDK Runtime Environment (build 1.7.0 _ 24-b18)
OpenJDK HotSpot (TM) Client VM (build 24.45-b08, mixed mode, sharing)

To further view the JDK information:
[Root @ localhost ~] # Rpm-qa | grep java
Tzdata-java-2012c-1.el6.noarch
Java-1.7.0-openjdk-1.7.0.45-1.45.1.11.1.el6.x86_64

Uninstall OpenJDK and perform the following operations:
[Root @ localhost ~] # Rpm-e -- nodeps tzdata-java-2012c-1.el6.noarch
[Root @ localhost ~] # Rpm-e -- nodeps java-1.7.0-openjdk-1.7.0.45-1.45.1.11.1.el6.x86_64

Install JDK
Upload new jdk-7-linux-i586.rpm software to/usr/local/to perform the following operations:
[Root @ localhost ckb] # rpm-ivh jdk-7-linux-i586.rpm
JDK is installed in/usr/java by default.

Verify Installation
Perform the following operations to check whether the information is normal:
[Root @ localhost bin] # java
[Root @ localhost bin] # javac
[Root @ localhost bin] # java-version
Java version "1.7.0 _ 45"
Java (TM) SE Runtime Environment (build 1.7.0 _ 45-b18)
Java HotSpot (TM) Client VM (build 24.45-b08, mixed mode, sharing)

Configure Environment Variables
After installing the jdk-7-linux-i586.rpm on my machine, I can still perform the javac and java-version operations without configuring environment variables, so I didn't configure JDK environment variables. However, for future discomfort, we should record how to configure it as follows:
Modify the system environment variable File
Vi +/etc/profile

Append the following content to the file:
JAVA_HOME =/usr/java/jdk1.7.0 _ 45
JRE_HOME =/usr/java/jdk1.7.0 _ 45/jre
PATH = $ PATH: $ JAVA_HOME/bin: $ JRE_HOME/bin
CLASSPATH =: $ JAVA_HOME/lib/dt. jar: $ JAVA_HOME/lib/tools. jar: $ JRE_HOME/lib
Export JAVA_HOME JRE_HOME PATH CLASSPATH

Make the modification take effect
[Root @ localhost ~] # Source/etc/profile // make the modification take effect immediately
[Root @ localhost ~] # Echo $ PATH // view the PATH value

View system environment status
[Root @ localhost ~] # Echo $ PATH
/Usr/lib/qt-3.3/bin:/usr/local/sbin:/usr/sbin: /usr/java/jdk1.7.0 _ 45/bin:
/Usr/java/jdk1.7.0 _ 45/jre/bin:/home/ckb/bin

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