Shulou(Shulou.com)06/02 Report--

Editor to share with you how to install the Java environment in debian. I hope you will get something after reading this article. Let's discuss it together.

1. Get the JDK of sun

You can choose to download from the official Java: http://java.sun.com or other websites

JRE (J2RE)

Java Runtime Environment-if you don't plan to create your own Java application, just install it.

JDK (J2SDK)

Java Development Kit-Java's software open tool. If you need to create your own Java application, you need to choose JDK. Exe.

The latest version is:

JDK: jdk-1_5_0_06-linux-i586.bin

JRE: jre-1_5_0_06-linux-i586.bin

Note: JRE is already included in SDK. Below, take JDK as an example.

two。 Build a packaging environment

Fortunately, Debian provides us with SDK's DEB package building tool: java-package

# apt-get install-u java-package fakeroot

Note: update the package list before installation

3. Create a .deb package

Run as a normal user:

$fakeroot make-jpkg jdk-1_5_0_06-linux-i586.bin

In the process, there may be some warning messages and make some necessary choices. After a few minutes, you should be prompted that the package was created successfully. So congratulations, you'll find something like this in the current directory:

Sun-j2sdk1.5_1.5.0+update06_i386.deb

Software package of

4. Installation

You should switch to the root user to execute the following command:

# dpkg-I sun-j2sdk1.5_1.5.0+update06_i386.deb

Of course, you should specify the correct package name as appropriate. This is easy to do. Just check the current directory.

5. Configure the environment

Add something similar to the following in the / etc/profile (or ~ / .bashrc) script file

PATH=$PATH:/usr/lib/j2sdk1.5-sun/bin:/usr/lib/j2sdk1.5-sun/jre/bin

JAVA_HOME=/usr/lib/j2sdk1.5-sun

JRE_HOME=/usr/lib/j2sdk1.5-sun/jre

CLASSPATH=.:/usr/lib/j2sdk1.5-sun/lib/tools.jar:/usr/lib/j2sdk1.5-sun/lib/dt.jar

Export PATH

Export JRE_HOME

Export JAVA_HOME

Export CLASSPATH

6. test

Set the current default java interpreter update-alternatives-- config java

After execution, a picture similar to the following appears:

There are 4 alternatives which provide `java'.

Selection Alternative

1 / usr/bin/gij-wrapper-4.1

* + 2 / usr/lib/jvm/java-gcj/jre/bin/java

3 / usr/lib/jvm/java-1.5.0-sun/jre/bin/java

Press enter to keep the default

, or type selection number:3

Enter the number in front of the line that contains "sun". As shown above, enter 3, and then enter enter to confirm.

A simple test. All you have to do is execute the command:

$java-version

You should see some information about the java version similar to the following:

Java version "1.5.02.06"

Java (TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)

Java HotSpot (TM) Client VM (build 1.5.0_06-b05, mixed mode, sharing)

A slightly more troublesome test

Create a simple java program (Hello.java)

Public class Hello {

Public Hello () {

}

Public static void main (String [] args) {

System.out.println ("Hello World!")

}

}

And then

$javac Hello.java

Check that the current directory will become a file named Hello.class, and then run

$java Hello

Hello World!

OK, the test is successful!

7. Install the plug-in

For Java environments installed in this way, the browser plug-in file location should be located in:

$JAVA_HOME/jre/plugin/arch/ns7/libjavaplugin_oji.so

For example: / usr/lib/j2sdk1.5-sun/jre/plugin/i386/ns7/libjavaplugin_oji.so

Take firefox (> 1.0) as an example:

# cd / usr/lib/mozilla-firefox/plugins

# ln-s

/ usr/lib/j2sdk1.5-sun/jre/plugin/i386/ns7/libjavaplugin_oji.so

Or in the Debian way:

# update-alternatives-verbose-install

/ usr/lib/mozilla-firefox/plugins/libjavaplugin.so

Firefox-javaplugin.so

$JAVA_HOME/jre/plugin/i386/ns7-gcc29/libjavaplugin_oji.so 500

Then, restart the browser and browse the test web page: http://serios.net/content/applets/viewinfoawt.php

8. Unloading

Uninstall the package:

# apt-get remove-purge sun-j2sdk1.5

Uninstall the plug-in and delete the symbolic link directly:

# rm / usr/lib/mozilla-firefox/plugins/libjavaplugin_oji.so

If you installed the plug-in using the update-alternatives command, you can delete it by executing the following command:

# update-alternatives-remove firefox-javaplugin.so

$JAVA_HOME/jre/plugin/i386/ns7/libjavaplugin_oji.so

9. Chinese culture

Install Chinese fonts:

Create a fallback directory under the $JAVA_HOME/jre/lib/fonts/ directory.

Copy Chinese fonts (e.g. simsun.ttf) to this directory.

After reading this article, I believe you have a certain understanding of "how to install Java environment in debian". If you want to know more about it, you are welcome to follow the industry information channel. Thank you for reading!

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