Linux installation JDK

tar.gz

Http://www.cnblogs.com/memory4young/p/ubuntu-install-jdk.html

How to install JDK under Linux, take Ubuntu as an example.

First, download

First of all, of course it is to download.

Address: http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html

Select a different version as needed. The author chooses the jdk-7u45,

Second, decompression

Unzip the downloaded. tar.gz file.

Use the following command to extract:

Tar zxvf./jdk-7u45-linux-x64. tar.gz

For ease of administration, you can move the extracted files to another folder.

You can do it without doing it.

The author moved the file to the/opt/java/jdk/directory.

To facilitate the next set of environment variables, change the folder to a short name--jdk1.7

You can rename a folder by using the following command

MV Jdk1. 7.0_45/jdk1. 7/ 

Third, set environment variables

Edit the. bashrc file.

Enter the following command at the terminal:

VI ~/.BASHRC

At the end of the file, add the following lines of code:

Export JAVA_HOME=/OPT/JAVA/JDK/JDK1. 7Export classpath=${java_home}/libexport path=${java_home}/bin: $PATH  

In order for the changes to take effect immediately, execute the following command at the terminal:

SOURCE ~/.BASHRC

P.S. It is best to back up the backup command before modifying the. bashrc file:

CP. BASHRC. bash_original

Iv. Verification

With the above steps, the JDK is installed.

Enter the following command to verify the java-version ,

The bin file is downloaded

1. Cd/usr/lib
2. sudo mkdir java
3. CD Java
4. CP ~/jdkxxx.bin/usr/lib/java/
5. sudo chmod a+x jdkxxx.bin
6. sudo./jdkxxx.bin

Jdkxxx.bin is the file name of the download, ~/jdkxxx.bin is the path to save the downloaded file. The first time you execute sudo, you need to enter the root password and enter it.

In the end, you'll see a done. Indicates that the installation is complete.

2) Configure Environment variables: Open the/etc/profile file and add the following paragraph at the bottom of the file:

1. Export java_home=/usr/lib/java/jdk1.6.0_29
2. Export path= $JAVA _home/bin: $PATH
3. Export classpath=.: $JAVA _home/lib/dt.jar: $JAVA _home/lib/tools.jar: $CLASSPATH

Where/usr/lib/java/jdk1.6.0_29 is the installation root directory of the JDK. Command:

1. sudo gedit/etc/profile

Ctrl+s save Close, then:

1. sudo source/etc/profile

Make the environment variable configuration effective so that you do not have to restart. However, only valid at the current terminal, if you open a terminal again, you need to do it again.

Finally, enter the command to check if the configuration was successful:

1. Java-version

If the configuration succeeds, the version number of the JDK appears, as shown in:

Linux installation jdk RPM version step

1, first download the JDK from the Internet (jdk-7u1-linux-i586.rpm),: http://www.oracle.com/technetwork/java/javase/downloads/ jdk-7u1-download-513651.html, downloaded and placed in the/home directory, of course, the other place is OK.

2. Enter the installation directory
#cd/Home
#cp jdk-7u1-linux-i586.rpm/usr/local
#cd/usr/local
Add executable permissions to all users

#rpm-IVH jdk-7u1-linux-i586.rpm

Installation process:

3. Setting Environment variables

#vi/etc/profile

When open, add the following environment variable configuration code at the bottom of the document:

Export java_home=/usr/java/javajdk1.7.0_01
Export classpath=.: $JAVA _home/lib/dt.jar: $JAVA _home/lib/tools.jar
Export path= $JAVA _home/bin: $PATH

Note:export path= $JAVA _home/bin: $PATH, pay attention to putting $path to the last. To avoid problems with old and new versions.

4. Check if the JDK is installed successfully.
#java-version
If you see the JVM version and related information, the installation is successful!

-----------Split Line-----------------

When you have successfully installed the javajdk1.7.0_01 into the/usr/java, and configured the system environment variables
Execute # java-version When the javajdk1.7.0_01 is displayed because your Linux system has a default JDK;

1.# Cd/usr/bin

# ln-s-f/usr/java/javajdk1.7.0_01/jre/bin/java

# ln-s-f/usr/java/javajdk1.7.0_01/bin/javac

2, then uninstall javajdk1.7.0_01, re-install again. Uninstall method:

Check the JAVAJDK1.7.0_01 package name first

#rpm-qa | grep JDK

Then execute

#rpm-E Jdk-1.7.0_01-fcs

When you are finished uninstalling, reinstall jdk-7u1-linux-i586.rpm again.

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Linux installation JDK