How to install JDK under CentOS

1, download JDK installation package: jdk-7u5-linux-i586.rpm (32bit)

· Download Address: http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1637583.html

· Put in/tmp directory

2. Install JDK with rpm (i.)

· [Root@c1091test ~]# cd/tmp//To/tmp directory

· [Root@c1091test tmp]# rpm-i jdk-7u5-linux-i586.rpm//install JDK

· Unpacking JAR files ...

· Rt.jar ...

· Jsse.jar ...

· Charsets.jar ...

· Tools.jar ...

· Localedata.jar ...

· Plugin.jar ...

· Javaws.jar ...

· Deploy.jar ...

· [Root@c1091test tmp]# Ls/usr/java//See if JDK is installed, you can see that it is already installed in the/usr/java directory

· Default JDK1.7.0_05 Latest

· [Root@c1091test tmp]# VI ~/.bash_profile//configure Java environment variables

3. Install JDK with RPM (II.)

· The ~/.bash_profile file is modified as follows:

· #. Bash_profile

· # get the aliases and functions

· If [f ~/.BASHRC]; Then

· . ~/.bashrc

· Fi

· # User specific environment and startup programs

· Java_home=/usr/java/jdk1.7.0_05

· Classpath=.: $JAVA _home/lib/tools.jar: $JAVA _home/lib/dt.jar

· Path= $PATH: $HOME/bin:java_home/bin: $JAVA _home/jre/bin:/sbin

· Export PATH java_home CLASSPATH

· Unset USERNAME

· Press ESC to enter: Wq save exit, if the input Java and javac can run correctly means the installation is successful. Let's do a test to see if the installation is successful

4. Test whether the JDK is installed successfully

· Navigate to/tmp directory first:

· Write a Helloworld.java file for testing

public class HelloWorld

{

public static void Main (String args[])

{

System.out.println ("helloworld!!");

}

}

[Root@localhost/]# VI Helloworld.java//write as above program

[Root@c1091test tmp]# Javac Helloworld.java

§[root@c1091test tmp]# Java HelloWorld

§helloworld!!

· If you can see the information above, the installation is successful