Install and configure jython in Linux

1. Install jdk:

(The method here is used for ubuntu or debian, And the downloaded jdk is built into a deb package. I think it is to facilitate package management. Otherwise, I do not know which files to delete when I delete them, very troublesome .)

1. Obtain JDK

You can choose to download from Java official: URL: http://java.sun.com or from another website. My version is: jdk-1_5_0-linux-i586.bin

2. Build a Packaging Environment
　
Debian provides the SDK's DEB package build tool: java-package, while Ubuntu is based on Debian, so

# Apt-get install-u java-package fakeroot

Update before apt-get.

3. Create. Deb Software Package

This step must be run as a normal user. If it is run as Root, it is not allowed. The following message is displayed:

You are real root -- unfortunately, some Java distributions have
Install scripts that directly manipulate/etc, and may cause some
Inconsistencies on your system. Instead, you shoshould become
Non-root user and run:
FAK eroot make-jpkg jdk-1_5_0-linux-i586.bin
Which will allow no damage to be done to your system files and
Still permit the Java distribution to successfully extract.
Aborting.

Run as a common user:

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

Next, make some necessary choices. After a few minutes, the prompt that the software package is successfully created appears. You will find something similar in the current directory:
　
Software Package for sun-j2sdk1.5_1.5.0 + update00_i386.deb

4. Installation

Switch back to root and execute the following command:

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

5. Configure the environment

In ~ /. Add the following content to the 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

Create a simple java program (Hello. java)

Public class Hello
{
Public Hello ()
{
}
Public static void main (String [] args)
{
System. out. println ("Hello World! ";
}
}

Then

$ Javac Hello. java

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

$ Java Hello
Hello World!
OK. The test is successful!

7. Chinese font installation in Chinese culture:

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

Copy the Chinese font (for example, simsun. ttf to this directory.

8. Install the plug-in

For the Java environment installed in this method, the location of the browser plug-in file should be:

/Usr/lib/j2sdk1.5-sun/jre/plugin/i386/ns7/libjavaplugin_oji.so
　
Taking firefox1.5.0.1 as an example:

# Cd/usr/lib/mozilla-firefox/plugins
# Ln-s
/Usr/lib/j2sdk1.5-sun/jre/plugin/i386/ns7/libjavaplugin_oji.so

Uninstall JDK:

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

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

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

Ii. Install jython:

1. http://www.jython.org/project/installation.htmldownload the jythoninstallation file, run the command to install Java-jar jython_installer-2.2rc2.jar ", jython is installed successfully. For example, install it in the/home/justin/java/jython2.2 directory.

2. add the jython package to classpath, that is, change the classpath above to: CLASSPATH =. :/usr/lib/j2sdk1.5-sun/lib/tools. jar:/usr/lib/j2sdk1.5-sun/lib/dt. jar:/home/justin/java/jython2.2/jython. jar

Then you can add the python Library to the java file, for example:

Import org. python. util. PythonInterpreter;
Import org. python. core .*;
Public class SimpleEmbedded {
Public static void main (String [] args)
Throws PyException
{
PythonInterpreter interp =
New PythonInterpreter ();
System. out. println ("Hello, brave new world ");
Interp.exe c ("import sys ");
Interp.exe c ("print sys ");
Interp. set ("a", new PyInteger (42 ));
Interp.exe c ("print ");
Interp.exe c ("x = 2 + 2 ");
PyObject x = interp. get ("x ");
System. out. println ("x:" + x );
System. out. println ("Goodbye, cruel world ");

}
}

3. Add the selected/home/justin/java/jython2.2/jython installation PATH to the PATH environment variable. Now you only need to enter "jython" to run the interactive PATH:

$ Jython
Jython 2.1 on java1.4.0 _ 01 (JIT: null)
Type "copyright", "credits" or "license" for more information.

>>># Access the standard Java library through Jython

>>> From java. util import Random
>>> Rng = Random ()
>>> I = rng. nextBoolean ()
>>> Print I

The jython interpreter is convenient for quick checks and prompts, but you do not have to do all the work here-Jython allows you to write code in the source file and then run the code

From java. util import Random
Rng = Random ()
# This is a comment in Jython
Print "Flipping a coin ...... "
If rng. nextBoolean ():
Print "Came up heads"
Else:
Print "Came up tails"

Run the file in jython.

Source: it