Steps to build Java environment under Linux server (centOS) (picture)

Under centOS, Alibaba Cloud and others have pre-set jdk, but it is not SUN's java JDK. Generally, you need to reinstall the jdk, and generally the Jdk installed by yourself is relatively easy to control the version and is stable. Sex is higher. So the following is me uninstalling the pre-installed jdk and selecting my own version to reprint.

The following is the specific installation step process for building a Java environment under Linux server (centOS): (recorded only for better sharing)

1. First, query the jdk version of java on the 172.16...163 server:

Then visit the oracle official website to download jdk, or you can directly visit the following website to download the historical version of JDK:
http://www.oracle.com/technetwork/java/javase/downloads/java-archive-downloads-javase7-521261.html#jdk-7u80-oth-JPR

2. Enter the command in the terminal: rpm -qa | grep java
Check whether centos has its own openJdk. If so, as shown below:

Under normal circumstances, we have to uninstall the OPENJDK that comes with Linux, and then install SUN’s JDK.
Next, delete these JDKs and use the following rpm -ev command to delete these packages:

# rpm -ev package name

3. After downloading, use winscp to move the jdk compressed package into the corresponding directory of the server, and use the tar command to decompress the jdk package:
# tar -zxvf jdk -7u10-linux-i586.tar.gz
At this point, the installation work is basically completed. The following is to set the environment variables
4, and then vi /etc/ profile, enter and set environment variables:
shift + g Navigate to the end of the file and add the code:
export JAVA_HOME=/home /software/jdk1.7.0_10 (modify according to your own full path)
export PATH=$PATH:$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
(Only the yellow part is modified)

5. Let the environment variables take effect, execute the configuration file to take effect immediately, and then enter:
source /etc/profile

6. Then execute the following command to verify whether the installation is successful:
java -version

Now install jdk Done successfully.

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