Re: [exec]How could I use exec to execute a java program with keyboard input in it?

2011-09-28 Thread Siegfried Goeschl 

Hi,

if I understand that correctly you would like to get some keyboard input 
for your child process - I have never done that but I think the 
following snippet from DefaultExecutorTest might show you the way


Cheers,

Siegfried Goeschl

/**
 * The test script reads an argument from codestdincode and prints
 * the result to stdout. To make things slightly more interesting
 * we are using an asynchronous process.
 *
 * @throws Exception the test failed
 */
public void testStdInHandling() throws Exception {

ByteArrayInputStream bais = new 
ByteArrayInputStream(Foo.getBytes()); // newline not needed; causes 
problems for VMS

CommandLine cl = new CommandLine(this.stdinSript);
PumpStreamHandler pumpStreamHandler = new PumpStreamHandler( 
this.baos, System.err, bais);
DefaultExecuteResultHandler resultHandler = new 
DefaultExecuteResultHandler();

Executor executor = new DefaultExecutor();
executor.setStreamHandler(pumpStreamHandler);
executor.execute(cl, resultHandler);

resultHandler.waitFor(WAITFOR_TIMEOUT);
assertTrue(ResultHandler received a result, 
resultHandler.hasResult());


assertFalse(exec.isFailure(resultHandler.getExitValue()));
String result = baos.toString();
assertTrue(Result '+result+' should contain 'Hello Foo!', 
result.indexOf(Hello Foo!) = 0);

}


On 27.09.11 09:41, Yi Huang wrote:

For example:

import java.util.Scanner;

public class ToBeCalled {

public static void main(String[] args) {
Scanner keyboard = new Scanner(System.in);
int t = keyboard.nextInt();
System.out.println(t);
}
}

How could I use exec to let it run properly?
I have tried this:

// compile
cmdline = CommandLine.parse(javac);
executor = new DefaultExecutor();
cmdline.addArgument(ToBeCalled.java);
exitValue = executor.execute(cmdline);
System.out.println(compile:  + exitValue);

// run
cmdline = CommandLine.parse(java);
cmdline.addArgument(ToBeCalled);
cmdline.addArgument(abc);
cmdline.addArgument(def);
executor = new DefaultExecutor();
exitValue = executor.execute(cmdline);
System.out.println(run:  + exitValue);

It did compile, but crashed and said that there is no argument in nextInt()
How could I fix that?



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Re: [exec]How could I use exec to execute a java program with keyboard input in it?

2011-09-28 Thread Yi Huang 
Thank you very much!
That was exactly what I want.

在 2011年9月28日星期三，Siegfried Goeschl siegfried.goes...@it20one.at 写道：
 Hi,

 if I understand that correctly you would like to get some keyboard input
for your child process - I have never done that but I think the following
snippet from DefaultExecutorTest might show you the way

 Cheers,

 Siegfried Goeschl

/**
 * The test script reads an argument from codestdincode and prints
 * the result to stdout. To make things slightly more interesting
 * we are using an asynchronous process.
 *
 * @throws Exception the test failed
 */
public void testStdInHandling() throws Exception {

ByteArrayInputStream bais = new
ByteArrayInputStream(Foo.getBytes()); // newline not needed; causes
problems for VMS
CommandLine cl = new CommandLine(this.stdinSript);
PumpStreamHandler pumpStreamHandler = new PumpStreamHandler(
this.baos, System.err, bais);
DefaultExecuteResultHandler resultHandler = new
DefaultExecuteResultHandler();
Executor executor = new DefaultExecutor();
executor.setStreamHandler(pumpStreamHandler);
executor.execute(cl, resultHandler);

resultHandler.waitFor(WAITFOR_TIMEOUT);
assertTrue(ResultHandler received a result,
resultHandler.hasResult());

assertFalse(exec.isFailure(resultHandler.getExitValue()));
String result = baos.toString();
assertTrue(Result '+result+' should contain 'Hello Foo!',
result.indexOf(Hello Foo!) = 0);
}


 On 27.09.11 09:41, Yi Huang wrote:

 For example:

 import java.util.Scanner;

 public class ToBeCalled {

 public static void main(String[] args) {
 Scanner keyboard = new Scanner(System.in);
 int t = keyboard.nextInt();
 System.out.println(t);
 }
 }

 How could I use exec to let it run properly?
 I have tried this:

 // compile
 cmdline = CommandLine.parse(javac);
 executor = new DefaultExecutor();
 cmdline.addArgument(ToBeCalled.java);
 exitValue = executor.execute(cmdline);
 System.out.println(compile:  + exitValue);

 // run
 cmdline = CommandLine.parse(java);
 cmdline.addArgument(ToBeCalled);
 cmdline.addArgument(abc);
 cmdline.addArgument(def);
 executor = new DefaultExecutor();
 exitValue = executor.execute(cmdline);
 System.out.println(run:  + exitValue);

 It did compile, but crashed and said that there is no argument in
nextInt()
 How could I fix that?


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 To unsubscribe, e-mail: user-unsubscr...@commons.apache.org
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[exec]How could I use exec to execute a java program with keyboard input in it?

2011-09-27 Thread Yi Huang 
For example:

import java.util.Scanner;

public class ToBeCalled {

public static void main(String[] args) {
Scanner keyboard = new Scanner(System.in);
int t = keyboard.nextInt();
System.out.println(t);
}
}

How could I use exec to let it run properly?
I have tried this:

// compile
cmdline = CommandLine.parse(javac);
executor = new DefaultExecutor();
cmdline.addArgument(ToBeCalled.java);
exitValue = executor.execute(cmdline);
System.out.println(compile:  + exitValue);

// run
cmdline = CommandLine.parse(java);
cmdline.addArgument(ToBeCalled);
cmdline.addArgument(abc);
cmdline.addArgument(def);
executor = new DefaultExecutor();
exitValue = executor.execute(cmdline);
System.out.println(run:  + exitValue);

It did compile, but crashed and said that there is no argument in nextInt()
How could I fix that?