package javaapplication3;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
/**
 *
 * @author chenshu
 */
public class CommandHelper {
    //default time out, in millseconds
    public static int DEFAULT_TIMEOUT;
    public static final int DEFAULT_INTERVAL = 1000;
    public static long START;
    public static CommandResult exec(String command) throws IOException, InterruptedException {
        Process process = Runtime.getRuntime().exec(command);
        CommandResult commandResult = wait(process);
        if (process != null) {
process.destroy();
        }
        return commandResult;
    }
    private static boolean isOverTime() {
        return System.currentTimeMillis() - START >= DEFAULT_TIMEOUT;
    }
    private static CommandResult wait(Process process) throws InterruptedException, IOException {
        BufferedReader errorStreamReader = null;
        BufferedReader inputStreamReader = null;
        try {
errorStreamReader = new BufferedReader(new InputStreamReader(process.getErrorStream()));
inputStreamReader = new BufferedReader(new InputStreamReader(process.getInputStream()));
//timeout control
START = System.currentTimeMillis();
boolean isFinished = false;
for (;;) {
if (isOverTime()) {
CommandResult result = new CommandResult();
result.setExitValue(CommandResult.EXIT_VALUE_TIMEOUT);
result.setOutput("Command process timeout");
return result;
}
if (isFinished) {
CommandResult result = new CommandResult();
result.setExitValue(process.waitFor());
//parse error info
if (errorStreamReader.ready()) {
StringBuilder buffer = new StringBuilder();
String line;
while ((line = errorStreamReader.readLine()) != null) {
buffer.append(line);
}
result.setError(buffer.toString());
}
//parse info
if (inputStreamReader.ready()) {
StringBuilder buffer = new StringBuilder();
String line;
while ((line = inputStreamReader.readLine()) != null) {
buffer.append(line);
}
result.setOutput(buffer.toString());
}
return result;
}
try {
isFinished = true;
process.exitValue();
} catch (IllegalThreadStateException e) {
// process hasn't finished yet
isFinished = false;
Thread.sleep(DEFAULT_INTERVAL);
}
}
        } finally {
if (errorStreamReader != null) {
try {
errorStreamReader.close();
} catch (IOException e) {
}
}
if (inputStreamReader != null) {
try {
inputStreamReader.close();
} catch (IOException e) {
}
}
        }
    }
}

public static void main(String[] args) {
        try {
int timeout = Integer.parseInt(args[0]);
CommandHelper.DEFAULT_TIMEOUT = timeout;
CommandResult result = CommandHelper.exec("mkdir testdir");
if (result != null) {
System.out.println("Output:" + result.getOutput());
System.out.println("Error:" + result.getError());
}
        } catch (IOException ex) {
System.out.println("IOException:" + ex.getLocalizedMessage());
        } catch (InterruptedException ex) {
System.out.println("InterruptedException:" + ex.getLocalizedMessage());
        }
    }