Environment Variables for Java

1: To the Java official website http://www.java.com/zh_CN/download/manual.jsp Download, the corresponding Java version. Do not download the wrong, or later can not use, but also have to reinstall the installation. For 32-bit Linux, it is recommended to download the Linux RPM (self-extracting file) file size: 20.1 MB , the file name after download, similar to jdk-6u22-linux-i586.rpm.

Related installation process, can refer to:

Http://www.java.com/zh_CN/download/help/linux_x64rpm_install.xml

2: Open the terminal and go to the JDK download directory, such as Cd/home/yourname/downloads/jdk-6u22-linux-i586.bin

3: Move the file to the/usr/java directory: Mv/home/yourname/downloads/jdk-6u22-linux-i586.bin/usr/java

4: Enter into the/usr/java directory: Cd/usr/java

5: Add executable permissions to all users, adding permissions to files: chmod a+x jdk-6u22-linux-i586.bin

6: Install:./jdk-6u22-linux-i586.bin

7: A folder is automatically generated after installation: Jdk-1.6.0_22

8: Modify config Java environment variable: vi/etc/profile

• Add a few lines of code at the end of the file:

• #set Java Environment

Export java_home=/usr/java/jdk-1.6.0_22/
Export Jre_home=/usr/java/jdk-1.6.0_22/jre/
Export path= $JAVA _home/bin: $JRE _home/bin: $PATH
Export classpath=.: $JAVA _home/lib/: $JRE _home/lib: $CLASSPATH

9:

Save, exit, restart Linux, and then

Or

[[email protected] etc]# source/etc/profile← can take effect without restarting the machine

Log off the user and re-enter the system to check whether the configuration was successful with the following command: Java-version,java,javac

10:

View version:
Rpm-qa|grep JDK
Unloading:
RPM-E--nodeps Jdk-1.6.0_25-fcs

11:

Note:

To make the JDK available to all users, you can:

vi/etc/profile.d/java.sh

In the new java.sh, enter the following:

#set Java Environment

Java_home=/usr/java/jdk-1_5_0_02

Classpath=.:$java_home/lib/tools.jar

Path=$java_home/bin:$path

Export Java_home CLASSPATH PATH

Save exit and assign permissions to java.sh: chmod 755/etc/profile.d/java.sh

Law II:

1. Download:Jdk-1_5_0_06-linux-i586-rpm.bin
Address:http://java.sun.com/j2se/1.5.0/download.jsp
2. Add executable permissions to the file
[Email protected] java]# chmod +xJdk-1_5_0_06-linux-i586-rpm.bin
3. Executive Jdk-1_5_0_06-linux-i586-rpm.bin
[Email protected] java]#.Jdk-1_5_0_06-linux-i586-rpm.bin
Generate jdk-1_5_0_06-linux-i586-rpm after execution
4. Installing jdk-1_5_0_06-linux-i586-rpm
[Email protected] java]# RPM-IVHjdk-1_5_0_06-linux-i586-rpm
Here I have the JDK installed in the/usr/java directory
5. Configure Environment variables
There are three ways to configure environment variables (Modify the/etc/profile file, modify the. bashrc file in the user directory, and modify it directly under the shell)
All I'm saying here is that I'm using the Modify/etc/profile file
[Email protected] java]# Vi/etc/profile
After opening the file, press the I key to add after the file:

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Environment Variables for Java