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import java.awt.AWTException;
import java.awt.Robot;
import java.awt.event.KeyEvent;
import java.io.IOException;

public class RobotSample {

	public static void main(String[] args) throws IOException {

		try {
			Robot robot = new Robot();
			Runtime runtime = Runtime.getRuntime();
			runtime.exec("C:\\Program Files (x86)\\Google\\Chrome\\Application\\chrome.exe");
			robot.delay(1000);
			//robot.keyPress(KeyEvent.VK_F6);
			//robot.keyPress(KeyEvent.VK_DELETE);
			robot.keyPress(KeyEvent.VK_T);
			robot.keyPress(KeyEvent.VK_W);
			robot.keyPress(KeyEvent.VK_I);
			robot.keyPress(KeyEvent.VK_T);
			robot.delay(70);
			robot.keyPress(KeyEvent.VK_T);
			robot.keyPress(KeyEvent.VK_E);
			robot.keyPress(KeyEvent.VK_R);
			robot.keyPress(KeyEvent.VK_DECIMAL);
			robot.keyPress(KeyEvent.VK_C);
			robot.keyPress(KeyEvent.VK_O);
			robot.keyPress(KeyEvent.VK_M);
			robot.keyPress(KeyEvent.VK_ENTER);
			robot.delay(200);
		} catch (AWTException e) {
			e.printStackTrace();
		}
	}
}

Java里有一个Robot类，主要用来产生各种native的鼠标和键盘事件。这个类在某些方面还是十分有用的，比如、利用Java的跨平台性，使用Robot类就可以模拟实际用户发出的键盘和鼠标事件来进行自动化测试。

原文：http://java.dzone.com/tips/write-your-own-custom