模拟的Java按住关键 [英] Simulate a key held down in Java

问题描述

我期待模拟拿着键盘按键下来的时间在Java中短期内的操作。我希望下面的code按住A键5秒，但它只是presses一次（产生一个A，在记事本进行测试时）。任何想法，如果我需要使用别的东西，或者如果我只是用awt.Robot类错在这里？

 机器人机器人= NULL;
机器人=新机器人（）;
robot.key preSS（KeyEvent.VK_A）;
视频下载（5000）;
robot.keyRelease（KeyEvent.VK_A）;
 

解决方案

Thread.sleep（）方法从执行停止当前线程（即按住键的线程）。

如果你想让它按住键为给定时间内，也许你应该在并行线程中运行它。

下面是一个建议，将让周围的Thread.sleep（）方法的问题（使用命令模式，所以你可以创建其他的命令和随意交换他们进出）：

 公共类主要{公共静态无效的主要（字串[] args）抛出InterruptedException的{
    最后RobotCommand pressAKeyCommand =新的pressAKeyCommand（）;
    线程t =新主题（新的Runnable（）{        公共无效的run（）{
            pressAKeyCommand.execute（）;
        }
    }）;
    t.start（）;
    视频下载（5000）;
    pressAKeyCommand.stop（）;  }
}类pressAKeyCommand实现RobotCommand {私人挥发性布尔isContinue = TRUE;公共无效的execute（）{
    尝试{
        机器人机器人=新的机器人（）;
        而（isContinue）{
            robot.key preSS（KeyEvent.VK_A）;
        }
        robot.keyRelease（KeyEvent.VK_A）;
    }赶上（前的AWTException）{
        //使用异常的东西
    }
}  公共无效停止（）{
     isContinue = FALSE;
  }
}接口RobotCommand {  无效的execute（）;  空隙停止（）;
}
 

I'm looking to simulate the action of holding a keyboard key down for a short period of time in Java. I would expect the following code to hold down the A key for 5 seconds, but it only presses it once (produces a single 'a', when testing in Notepad). Any idea if I need to use something else, or if I'm just using the awt.Robot class wrong here?

Robot robot = null; 
robot = new Robot();
robot.keyPress(KeyEvent.VK_A);
Thread.sleep(5000);
robot.keyRelease(KeyEvent.VK_A);

解决方案

Thread.sleep() stops the current thread (the thread that is holding down the key) from executing.

If you want it to hold the key down for a given amount of time, maybe you should run it in a parallel Thread.

Here is a suggestion that will get around the Thread.sleep() issue (uses the command pattern so you can create other commands and swap them in and out at will):

public class Main {

public static void main(String[] args) throws InterruptedException {
    final RobotCommand pressAKeyCommand = new PressAKeyCommand();
    Thread t = new Thread(new Runnable() {

        public void run() {
            pressAKeyCommand.execute();
        }
    });
    t.start();
    Thread.sleep(5000);
    pressAKeyCommand.stop();

  }
}

class PressAKeyCommand implements RobotCommand {

private volatile boolean isContinue = true;

public void execute() {
    try {
        Robot robot = new Robot();
        while (isContinue) {
            robot.keyPress(KeyEvent.VK_A);
        }
        robot.keyRelease(KeyEvent.VK_A);
    } catch (AWTException ex) {
        // Do something with Exception
    }
}

  public void stop() {
     isContinue = false;
  }
}

interface RobotCommand {

  void execute();

  void stop();
}

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