I am having an issue trying to write to stdin from java.
here is my python code which would be receiving the stdin input
import sys
data = sys.stdin.readlines()
print data
I am trying to write out to stdout in java but it keeps on printing to console.
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(System.out));
out.write("i am writing to stdin");
out.flush();
However it keeps on printing in java console instead of the python shell.
So if you want to redirect a programs stdout to an other programs stdin you usually use a pipe when calling them from shell. Here's an example scenario with your code that does this:
Java side (file called App.java):
import java.io.*;
public class App{
public static void main(String[] args) throws Exception{
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(System.out));
out.write("i am writing to stdin");
out.flush();
}
}
Python side (file called App.py):
#!/usr/bin/env python
import sys
data = sys.stdin.readlines()
print data
Then on the shell:
First compile the java app:
javac App.java
Then call them with a pipe:
java App | ./App.py
This will result in the output:
['i am writing to stdin']
