calling python from java,see logical error, why the URL string not return as result

[rspvsanjay]

import java.io.*;
class FirstClass
{
public static void main(String a[])
{
try{
String prg = "import sys\ndef main():\ndef get_text(str):"+"\n return str"+
"\ndef get_url_text(url):"+"\n return get_text(url)"
+"\ndef main():"+"\n get_url_text(sys.argv[1])"+"\nif __name__ == \"__main__\": main()";

BufferedWriter out = new BufferedWriter(new FileWriter("test234.py"));

out.write(prg);

out.close();

final String command = "python test234.py http://www.tutorialspoint.com/java/";

final Process sirDesc = Runtime.getRuntime().exec(command);

final java.io.InputStream inStreamBase = sirDesc.getInputStream();

final java.io.InputStreamReader inStreamISR = new java.io.InputStreamReader(inStreamBase);

final java.io.BufferedReader inStream = new java.io.BufferedReader(inStreamISR);

String inLine;

final StringBuilder result = new StringBuilder();

while (null != (inLine = inStream.readLine()))

result.append(inLine);

System.out.println("\n value is :\n "+result.toString());
}catch(Exception e){}
}
}



i want given URL to python program as results

[Oralloy]

I already discussed this in your previous thread: https://bytes.com/topic/java/answers...-result-string

Will you please tell us what you have done, and what errors you are seeing?

[Oralloy]

By the way, your use of the try/catch is suppressing output of all errors. The catch block does nothing, so any error information that was available is lost.

Please try removing the try/catch block and re-running your code - I expect that the messages will be valuable to you.

[rspvsanjay]

// thank sir my program is working perfectly there was logical //error of print statment not used in python program
// where do i put python file if i am using Eclipse IDE ??
import java.io.*;
class FirstClass
{
public static void main(String a[])throws Exception
{

//String prg = "import sys\ndef get_text(str):"+"\n return str"+
//"\ndef get_url_text(url):"+"\n return get_text(url)"
//+"\ndef main():"+"\n print get_url_text(sys.argv[1])"+"\nif __name__ == \"__main__\": main()";

//BufferedWriter out = new BufferedWriter(new FileWriter("test234.py"));

//out.write(prg);

//out.close();

final String command = "python sir_desc.py https://docs.oracle.com/javase/tutorial/";

final Process sirDesc = Runtime.getRuntime().exec(command);

final java.io.InputStream inStreamBase = sirDesc.getInputStream();

final java.io.InputStreamReader inStreamISR = new java.io.InputStreamReader(inStreamBase);

final java.io.BufferedReader inStream = new java.io.BufferedReader(inStreamISR);

String inLine;

final StringBuilder result = new StringBuilder();

while (null != (inLine = inStream.readLine()))

result.append(inLine);

System.out.println("\nvalue is :\n "+result.toString());
}
}

[rspvsanjay]

where do i put python file if I working with Eclipse IDE ?

[Oralloy]

You might want to create a Python project as part of your workspace.

Once this is done, you can use at least two easy methods to access the file:

1. Change the directory of execution (cd)
   System.setProperty("user.dir", "your-dir");
2. Include the full path in the process creation.
   final String command = "python /your-dir/test234.py http://www.tutorialspoint.com/java/";

Luck!