Linux server-install jdk

Install jdk

Jdk is a necessary tool for running or developing java. A lot of software depends on jdk, so you must learn to install jdk.

1. Check the jdk status of the current system

[root@localhost wj] # rpm-qa | grep java

Tzdata-java-2013g-1.el6.noarch

Java-1.6.0-openjdk-1.6.0.0-1.66.1.13.0.el6.i686 / / you can see that jdk is installed on the current system, but the version is too old

Java-1.7.0-openjdk-1.7.0.45-2.4.3.3.el6.i686

2. Delete the system jdk package

[root@localhost wj] # yum remove-y java-1.6.0

[root@localhost wj] # yum remove-y java-1.7.0

[root@localhost wj] # rpm-qa | grep java / / check whether it has been deleted

Tzdata-java-2013g-1.el6.noarch

3. Go to the official website to download the latest jdk package, http://www.oracle.com/technetwork/java/javase/downloads/index.html, and pay attention to 64-bit or 32-bit when downloading

4. Copy the downloaded package to "/ usr/local/src/" and decompress it.

[root@localhost src] # cp / media/sf_data/jdk-10.0.2_linux-x64_bin.tar / usr/local/src/jdk.tar

[root@localhost src] # tar-xvf jdk.tar

5. Configure the jdk environment variable, open "/ etc/profile", and append the following at the end

[root@localhost src] # gedit / etc/profile

# java environment

Export JAVAHOME=/usr/local/src/jdk-10.0.2 / / this path is the path of jdk decompression.

Export CLASSPATH=.:$ {JAVAHOME} / jre/lib/rt.jar:$ {JAVAHOME} / lib/dt.jar:$ {JAVAHOME} / lib/tools.jar

Export PATH=$PATH:$ {JAVAHOME} / bin

6. Refresh profile

[root@localhost src] # source / etc/profile

7. Test jdk and enter the command "Java-version" in the terminal.

[root@localhost src] # java-version

Java version "1.8.0,181"

Java (TM) SE Runtime Environment (build 1.8.0_181-b13)

Java HotSpot (TM) Client VM (build 25.181-b13, mixed mode)

[root@localhost src] #