java wait 超时抛出,java native进程超时

At the moment I execute a native process using the following:

java.lang.Process process = Runtime.getRuntime().exec(command);

int returnCode = process.waitFor();

Suppose instead of waiting for the program to return I wish to terminate if a certain amount of time has elapsed. How do I do this?

解决方案

This is how the Plexus CommandlineUtils does it:

Process p;

p = cl.execute();

...

if ( timeoutInSeconds <= 0 )

{

returnValue = p.waitFor();

}

else

{

long now = System.currentTimeMillis();

long timeoutInMillis = 1000L * timeoutInSeconds;

long finish = now + timeoutInMillis;

while ( isAlive( p ) && ( System.currentTimeMillis() < finish ) )

{

Thread.sleep( 10 );

}

if ( isAlive( p ) )

{

throw new InterruptedException( "Process timeout out after " + timeoutInSeconds + " seconds" );

}

returnValue = p.exitValue();

}

public static boolean isAlive( Process p ) {

try

{

p.exitValue();

return false;

} catch (IllegalThreadStateException e) {

return true;

}

}