How to install jdk in centos system

1. Source code package preparation:

First download jdk from the official website, http://www.oracle.com/technetwork /java/javase/downloads/jdk7-downloads-1880260.html, download jdk-7u45-linux-x64.tar.gz here, download to the main directory

2, decompress the source code package

Create a new java folder in the /usr/local directory through the terminal, command line:

sudo mkdir /usr/local/java

Then copy the downloaded compressed package to the java folder, command Line:

Enter the directory where the jdk source package is located

cp jdk-7u45-linux-x64.tar.gz /usr/local/java

(Recommended tutorial: centos usage tutorial)

Then enter the java directory, command Line:

cd /usr/local/java

Decompress the compressed package, command line:

sudo tar xvf jdk-7u45-linux-x64.tar.gz

Then you can delete the compressed package, command line:

sudo rm jdk-7u45-linux-x64.tar.gz

3. Set jdk environment variables

The global setting method is used here, which is to modify etc/profile, which is an environment variable shared by all users

sudo gedit /etc/profile

Open Then add

export JAVA_HOME=/usr/local/java/jdk1.7.0_45
export JRE_HOME=/usr/local/java/jdk1.7.0_45/jre
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin: $PATH

at the end. Please remember that during the above addition process, do not add spaces on both sides of the equal sign, otherwise "not a valid identifier" will appear, because when source /etc/profile Extra spaces will not be recognized and will be understood as part of the path.

Then save

source /etc/profile

Make the profile effective

4. Verify whether the installation is successful

In the terminal

java -version

Check if the installation is successful.

If successful, it will be displayed as follows:

java version "1.7.0_45"
Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)

Recommended related video tutorials: linux video tutorial

The above is the detailed content of How to install jdk in centos system. For more information, please follow other related articles on the PHP Chinese website!