How to install and configure Java environment variables in CentOS 7?

Installation environment:

Centos7 64-bit

Jdk1.8 64-bit

Xshell free version win10*64-bit

1. Come in first, you need to check whether your openjdk is uninstalled (or determine whether it exists, because generally centos will pre-install openjdk):

Enter rpm -qa | in xshell or rpm -qa | grep jdk grep java

rpm -qa | grep java

Second, if there is a corresponding openjdk and a response list is displayed, then you need to uninstall it.

Enter rpm-e-nodepstzdata-file name in xshell (this file name is the file name in the openjdk file list you view), and then delete it.

Third, create a java resource library

1. First, return to the root directory and enter cd/.

2. Then enter mkdir java.

3. Then enter the java directory you just created and enter cd java.

4. Enter the download address of java and download.

The operations of steps 1-4 are as follows.

cd/

#mkdirjava/

cdjava

wget-no-Check-certificate-no-cookies-header ' cookie : oraclelicense=accept-securebackup -cookie ' http://download . Oracle.com/OTN-pub/java/JDK/8u 171-b11/512 CD 62 EC 5174 c 3487 AC 17 c 61 aa 89 E8/JDK-8u 171-Linux-x64. tar . gz5 . Check the currently downloaded file name and then decompress the downloaded Java file.

Limit Switch

Tar-zxvfjdk-8u171-linux-x64.tar.gz IV. After completing the above steps, configure the environment variables.

vi /etc/profile

At the end of the file, add the following code

export Java _ HOME=/Java/JDK 1 . 8 . 0 _ 171

export CLaSS=. $ JAVA _ HOME/JRE/lib/rt . jar : $ JAVA _ HOME/lib/dt . jar : $ JAVA _ HOME/lib/tools . jar

Export path=$ Java _ home/bin : $ path//, then save and exit. After saving, the following source /etc/profile must be executed to reset the file for it to take effect.

5. Execute the java version to check whether the configuration is successful (the following means the configuration is successful).

jave droge ' 1 . 8 . 0 _ 144 '

Java(TM)Seruntimeenvironment(build 1 . 8 . 0 _ 144-b01)

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