commons-exec:我调用executor.execute(commandLine)时挂起; [英] commons-exec: hanging when I call executor.execute(commandLine);
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问题描述
我不知道为什么这挂了.我正在尝试捕获来自通过commons-exec运行的进程的输出,并且我继续挂起.我在下面提供了一个示例程序来演示此行为.
I have no idea why this is hanging. I'm trying to capture output from a process run through commons-exec, and I continue to hang. I've provided an example program to demonstrate this behavior below.
import java.io.DataInputStream;
import java.io.IOException;
import java.io.PipedInputStream;
import java.io.PipedOutputStream;
import org.apache.commons.exec.CommandLine;
import org.apache.commons.exec.DefaultExecutor;
import org.apache.commons.exec.ExecuteException;
import org.apache.commons.exec.PumpStreamHandler;
public class test {
public static void main(String[] args) {
String command = "java";
PipedOutputStream output = new PipedOutputStream();
PumpStreamHandler psh = new PumpStreamHandler(output);
CommandLine cl = CommandLine.parse(command);
DefaultExecutor exec = new DefaultExecutor();
DataInputStream is = null;
try {
is = new DataInputStream(new PipedInputStream(output));
exec.setStreamHandler(psh);
exec.execute(cl);
} catch (ExecuteException ex) {
} catch (IOException ex) {
}
System.out.println("huh?");
}
}
推荐答案
According to the javadoc, execute(CommandLine command)
is synchronous, execute(CommandLine command, ExecuteResultHandler handler)
on the other hand is asynchronous.
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