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how to redirect stdin to java Runtime.exec?


how to redirect stdin to java Runtime.exec?

By : pigtech
Date : November 19 2020, 07:01 PM
I wish this helpful for you Exec returns a Process object to you.
Process has getInputStream and getOutputStream methods.
code :


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Can Java Runtime.exec another java program that uses stdin?

Can Java Runtime.exec another java program that uses stdin?


By : Paktolus Solutions
Date : March 29 2020, 07:55 AM
seems to work fine Call the method Process.getOutputStream and feed your input to the returned output stream.
api docs:
code :
public abstract OutputStream getOutputStream()
Returns:
fork/exec: child exits when trying to redirect stdin/stdout

fork/exec: child exits when trying to redirect stdin/stdout


By : user3499923
Date : March 29 2020, 07:55 AM
wish of those help Probably the problem is in the call to execlp().
Although technically the list of arguments may be empty, it is standard practice to add always at least one argument, that will be argv[0] in main(), with the actual name used to invoke the program. Likely the python program uses this arg0 as argument to Py_SetProgramName() without checking for NULL.
code :
execlp("child_process", "child_process", (char*)NULL);
Java Runtime exec Redirect On Windows

Java Runtime exec Redirect On Windows


By : Sein
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I want to execute this command on windows, but It seems Java exec is not working with the redirect. How can I solve this problem?
code :
    String [] command = {"cmd" , "/C" ,cmd + " >" + finalPath};
    Process p = Runtime.getRuntime().exec(command);
C: Redirect stdin to external program via exec

C: Redirect stdin to external program via exec


By : user3505031
Date : March 29 2020, 07:55 AM
I hope this helps . You might want to modify the way you deliver the data, so that it will work for programs that are working in blocks, and expect EOF indicator.
The main should close the downstream, once it deliver the data. This will allow many programs that work in buffered mode to process the input, even when it's not completed lines. Also should checks for error/EOF on data coming from the child, and handle the output of large blocks.
code :
    ...
    close(upstream[1]);
    close(downstream[0]);

    // send second argument to pipe
    write(downstream[1], argv[1], strlen(argv[1]));
    close(downstream[1]) ;

    // read result from pipe
    char buffer[100];
    int nread ;
    // Lop until EOF or error.
    while ( (nread=read(upstream[0], buffer, sizeof(buffer)-1) > 0 ) {
        buffer[nread] = 0 ;       // NUL terminator.
        printf("OUTPUT: %s", buffer);
    } ;
    exit(0);

Jython naming conflict: java.lang.Runtime.exec and python's exec

Jython naming conflict: java.lang.Runtime.exec and python's exec


By : user4101242
Date : March 29 2020, 07:55 AM
should help you out I am translating some java code into Jython and there is a point where I need to call java.lang.Runtime. The code in Java reads:
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