passing data between python -> java? [solved]

[tegdim]

Hello,
I'm writing an application that takes pen data and tries to recognize the character and therefore predict the word you are writing. A java file will be returning text to stdout that contains the possible characters that the user just wrote.

I would like to be able to use nltk_lite in python to find possible words based on the bigram and return these possibilities to the java GUI to allow the user to choose the correct word.

I plan on the java and python programs to be sending data and possible next words back and forth between each other. Someone told me about pipes(?) and I couldn't find a simple tutorial online.

All i want to do is pass simple strings between the 2 programs. If anyone could recommend a python module or other way to achieve this it would be really helpful,

Thank you for any help :)

ps: I'm using linux if that makes any difference

[bartonc]

You might find something at
aspn.activestate.com/ASPN/Cookbook/Python/

[bartonc]

I found recipes which use standard library modules that would work if your java GUI can be an XML-RPC server & client.

[kudos]

I supply you with the "calling python from java part". (Thats the one you need right?)

Here is the python code (i.e. the one that should be called from the program)

import sys
 
# take the first input argument
 
mystring = sys.argv[1]
 
# reverses the string, but you can do anything you like here..
#
 
print mystring[::-1]
 

It simply reverses a string and output it to stdout. Now we would like to have a java program that get that info.

import java.io.*;
 
class SomeJavaProgram{
 
public static void main(String a[]) throws IOException{
 
Process process = Runtime.getRuntime().exec("python SomePythonProgram.py hello");
BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
System.out.println(reader.readLine());
reader.close();
 
}
 
}
 

Save the python program as "SomePythonProgram.py" and the java program as "SomeJavaProgram.java". Compile the java program, and run it.

Its not really a "pretty way" to do it, but it works. I recall vaugly that there was something called Jython, that (I think) was a python interpreter written in java. Maybe you could use this to embedd python in your java programs? (I have never used Jython)

-kudos

Hello,
I'm writing an application that takes pen data and tries to recognize the character and therefore predict the word you are writing. A java file will be returning text to stdout that contains the possible characters that the user just wrote.

I would like to be able to use nltk_lite in python to find possible words based on the bigram and return these possibilities to the java GUI to allow the user to choose the correct word.

I plan on the java and python programs to be sending data and possible next words back and forth between each other. Someone told me about pipes(?) and I couldn't find a simple tutorial online.

All i want to do is pass simple strings between the 2 programs. If anyone could recommend a python module or other way to achieve this it would be really helpful,

Thank you for any help :)

ps: I'm using linux if that makes any difference

[tegdim]

Thanks kudos,
that's just what I was looking for :)
Thanks again for the fast responses,
tegdim

I supply you with the "calling python from java part". (Thats the one you need right?)

Here is the python code (i.e. the one that should be called from the program)

import sys
 
# take the first input argument
 
mystring = sys.argv[1]
 
# reverses the string, but you can do anything you like here..
#
 
print mystring[::-1]
 

It simply reverses a string and output it to stdout. Now we would like to have a java program that get that info.

import java.io.*;
 
class SomeJavaProgram{
 
public static void main(String a[]) throws IOException{
 
Process process = Runtime.getRuntime().exec("python SomePythonProgram.py hello");
BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
System.out.println(reader.readLine());
reader.close();
 
}
 
}
 

Save the python program as "SomePythonProgram.py" and the java program as "SomeJavaProgram.java". Compile the java program, and run it.

Its not really a "pretty way" to do it, but it works. I recall vaugly that there was something called Jython, that (I think) was a python interpreter written in java. Maybe you could use this to embedd python in your java programs? (I have never used Jython)

-kudos