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  CentOS7 install JDK
  Add Date : 2016-10-09      
  One, CentOS 7 unloading system comes openjdk

1, built-in query system jdk, use the following command:

rpm -qa | grep java
At this point the system will list the presence of jdk, if there is to be unloaded, there is no direct installation.

2, uninstall, use the following command:

rpm -e --nodeps jdk related names
After uninstalling can be installed jdk, related queries and unloading operations

Two, jdk installation

1, jdk download and upload to / usr / java directory

jdk7 download address: http: //www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html select the corresponding version of linux, download rpm files. Here is a selection jdk-7u79-linux-x64.rpm. And upload it to the Linux / urs / java directory (java directory does not exist it will be created).

2, extract the installation

Run the following command to decompress

rpm -ivh rpm file name

3, the configuration profile file

Run the following command

vi / etc / profile
Add the following to the end and keep the profile file

export JAVA_HOME = / usr / java / jdk1.7.0_79
export CLASSPATH =:. $ JAVA_HOME / jre / lib / rt.jar: $ JAVA_HOME / lib / dt.jar: $ JAVA_HOME / lib / tools.jar
export PATH = $ PATH: $ JAVA_HOME / bin
/usr/java/jdk1.7.0_79 refers to the path of jdk

After saving, run the following commands to validate the configuration

source / etc / profile
Check jdk is installed successfully, run the following command

java -version
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