JDK 1.7 installation and configuration under Linux CentOS 7

foreword

Briefly record the whole process of installing and configuring JDK 1.7 in CentOS 7~

download

The first is the download address of jdk 1.7 64bit & 32bit:

jdk-7u79-linux-x64.tar.gz (http://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.tar.gz)
jdk-7u79-linux-i586.tar.gz (http://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-i586.tar.gz)

Check and uninstall OpenJDK

The first step is to check whether the system comes with OpenJDK and related installation packages, and if so, uninstall it first.
Check command:

java -version
rpm -qa | grep java

If you find that there are installed OpenJDK and installation packages, then uninstall them one by one.
Uninstall command:

rpm -e –nodeps tzdata-java-2012c-1.el6.noarch
rpm -e –nodeps java-1.6.0-openjdk-1.6.0.0-1.45.1.11.1.el6.x86_64

Copying the above command directly to xshell will cause an error. Be sure to pay attention to the two horizontal bars before –nodeps and modify it yourself.

Unzip the installation

After uploading the installation file to the linux server, enter the directory to perform decompression and installation:

tar -zxvf jdk-7u75-linux-x64.tar.gz

After unzipping create a new java directory and move the jdk directory just unzipped to the directory we created:

mkdir /wocloud/java
mv ./jdk1.7.0_75 /wocloud/java/

Finally delete the installation files:

rm -rf jdk-7u75-linux-x64.gz

Configure environment variables

After the installation is complete, you need to configure the environment variables and edit the /etc/profile file:

vi /etc/profile

Add the following configuration at the end of the file:

export JAVA_HOME=/wocloud/java/jdk1.7.0_75 
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar 
export PATH=$PATH:$JAVA_HOME/bin

Screenshot below:
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After editing, remember to enter : wq to save and exit. The last step is to reload the /etc/profile file through the source command, so that the modified content is valid in the current shell window:

source /etc/profile

test

Enter java -version to view the jdk version information:
write picture description here

As shown in the figure above, the jdk version is displayed normally, and the installation has been successful so far.

Summarize

Briefly record the steps of installing jdk 1.7 on Linux CentOS 7, I hope it will help friends who encounter the same problem, The End.

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