KeyPress：如何检测用户在应用程序运行时是否按下键盘上的“向下”箭头键

Question

这是我迄今为止所拥有的......我正在使用它作为键绑定。我想在应用程序运行时按“向下”箭头键，然后使其自动按下“向下”箭头键3次，然后在代码中按“Enter”键完成。我知道这不是最好的解释，但很抱歉，如果你还是不明白，我会尽力解释一下。

以下是代码：

public class MyKeyListener extends KeyAdapter{ 
@Override
public void keyPressed(KeyEvent evt){  
}

KeyListener keyListener = new KeyListener() {
    @Override
  public void keyPressed(KeyEvent keyEvent) {
    int keyCode = keyEvent.getKeyCode();
        if(keyCode == 1005){
        System.out.println("So far, so good..");
        }

  }

    @Override
    public void keyTyped(KeyEvent e) {
        throw new UnsupportedOperationException("Not supported yet.");
    }

    @Override
    public void keyReleased(KeyEvent e) {
        throw new UnsupportedOperationException("Not supported yet.");
    }

};

我认为关键箭头是1005。 我到目前为止写了System.out.println（“到目前为止，很好......”）;当我按下向下箭头键时，看看应用程序是否检测到它，但它没有......

有什么想法吗？

Answer 1

我只是把它扔到那里因为我觉得它对你有用，这是一个虚拟的Java键盘，修改过我几年前在网上找到的一些资源，我不再记得链接到： / p>

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

public class Keyboard {


    public void main (String[] args) throws InterruptedException {
        while(true) {
        type("

");
        }
    }


    private static Robot robot;
    static Random rand = new Random();

    public Keyboard() throws AWTException {
        this.robot = new Robot();
    }
    public Keyboard(Robot robot) {
        this.robot = robot;
    }
    public void type(CharSequence characters) throws InterruptedException {
        int length = characters.length();
        for (int i = 0; i < length; i++) {
                char character = characters.charAt(i);
                type(character);                

        }

         robot.keyPress(KeyEvent.VK_ENTER);
         robot.keyRelease(KeyEvent.VK_ENTER);
    }

    public void type(char character) {
        switch (character) {
        case 'a': doType(KeyEvent.VK_A); break;
        case 'b': doType(KeyEvent.VK_B); break;
        case 'c': doType(KeyEvent.VK_C); break;
        case 'd': doType(KeyEvent.VK_D); break;
        case 'e': doType(KeyEvent.VK_E); break;
        case 'f': doType(KeyEvent.VK_F); break;
        case 'g': doType(KeyEvent.VK_G); break;
        case 'h': doType(KeyEvent.VK_H); break;
        case 'i': doType(KeyEvent.VK_I); break;
        case 'j': doType(KeyEvent.VK_J); break;
        case 'k': doType(KeyEvent.VK_K); break;
        case 'l': doType(KeyEvent.VK_L); break;
        case 'm': doType(KeyEvent.VK_M); break;
        case 'n': doType(KeyEvent.VK_N); break;
        case 'o': doType(KeyEvent.VK_O); break;
        case 'p': doType(KeyEvent.VK_P); break;
        case 'q': doType(KeyEvent.VK_Q); break;
        case 'r': doType(KeyEvent.VK_R); break;
        case 's': doType(KeyEvent.VK_S); break;
        case 't': doType(KeyEvent.VK_T); break;
        case 'u': doType(KeyEvent.VK_U); break;
        case 'v': doType(KeyEvent.VK_V); break;
        case 'w': doType(KeyEvent.VK_W); break;
        case 'x': doType(KeyEvent.VK_X); break;
        case 'y': doType(KeyEvent.VK_Y); break;
        case 'z': doType(KeyEvent.VK_Z); break;
        case 'A': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_A); break;
        case 'B': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_B); break;
        case 'C': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_C); break;
        case 'D': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_D); break;
        case 'E': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_E); break;
        case 'F': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_F); break;
        case 'G': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_G); break;
        case 'H': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_H); break;
        case 'I': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_I); break;
        case 'J': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_J); break;
        case 'K': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_K); break;
        case 'L': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_L); break;
        case 'M': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_M); break;
        case 'N': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_N); break;
        case 'O': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_O); break;
        case 'P': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_P); break;
        case 'Q': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_Q); break;
        case 'R': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_R); break;
        case 'S': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_S); break;
        case 'T': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_T); break;
        case 'U': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_U); break;
        case 'V': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_V); break;
        case 'W': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_W); break;
        case 'X': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_X); break;
        case 'Y': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_Y); break;
        case 'Z': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_Z); break;
        case '`': doType(KeyEvent.VK_BACK_QUOTE); break;
        case '0': doType(KeyEvent.VK_0); break;
        case '1': doType(KeyEvent.VK_1); break;
        case '2': doType(KeyEvent.VK_2); break;
        case '3': doType(KeyEvent.VK_3); break;
        case '4': doType(KeyEvent.VK_4); break;
        case '5': doType(KeyEvent.VK_5); break;
        case '6': doType(KeyEvent.VK_6); break;
        case '7': doType(KeyEvent.VK_7); break;
        case '8': doType(KeyEvent.VK_8); break;
        case '9': doType(KeyEvent.VK_9); break;
        case '-': doType(KeyEvent.VK_MINUS); break;
        case '=': doType(KeyEvent.VK_EQUALS); break;
        case '~': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_BACK_QUOTE); break;
        case '!': doType(KeyEvent.VK_EXCLAMATION_MARK); break;
        case '@': doType(KeyEvent.VK_AT); break;
        case '#': doType(KeyEvent.VK_NUMBER_SIGN); break;
        case '$': doType(KeyEvent.VK_DOLLAR); break;
        case '%': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_5); break;
        case '^': doType(KeyEvent.VK_CIRCUMFLEX); break;
        case '&': doType(KeyEvent.VK_AMPERSAND); break;
        case '*': doType(KeyEvent.VK_ASTERISK); break;
        case '(': doType(KeyEvent.VK_LEFT_PARENTHESIS); break;
        case ')': doType(KeyEvent.VK_RIGHT_PARENTHESIS); break;
        case '_': doType(KeyEvent.VK_UNDERSCORE); break;
        case '+': doType(KeyEvent.VK_PLUS); break;
        case '\t': doType(KeyEvent.VK_TAB); break;
        case '\n': doType(KeyEvent.VK_ENTER); break;
        case '[': doType(KeyEvent.VK_OPEN_BRACKET); break;
        case ']': doType(KeyEvent.VK_CLOSE_BRACKET); break;
        case '\\': doType(KeyEvent.VK_BACK_SLASH); break;
        case '{': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_OPEN_BRACKET); break;
        case '}': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_CLOSE_BRACKET); break;
        case '|': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_BACK_SLASH); break;
        case ';': doType(KeyEvent.VK_SEMICOLON); break;
        case ':': doType(KeyEvent.VK_COLON); break;
        case '\'': doType(KeyEvent.VK_QUOTE); break;
        case '"': doType(KeyEvent.VK_QUOTEDBL); break;
        case ',': doType(KeyEvent.VK_COMMA); break;
        case '<': doType(KeyEvent.VK_LESS); break;
        case '.': doType(KeyEvent.VK_PERIOD); break;
        case '>': doType(KeyEvent.VK_GREATER); break;
        case '/': doType(KeyEvent.VK_SLASH); break;
        case '?': doType(KeyEvent.VK_SHIFT, KeyEvent.VK_SLASH); break;
        case ' ': doType(KeyEvent.VK_SPACE); break;
        default:
                throw new IllegalArgumentException("Cannot type character " + character);
        }
    }

    private static void doType(int... keyCodes) {
        doType(keyCodes, 0, keyCodes.length);
    }

    private static void doType(int[] keyCodes, int offset, int length) {
        if (length == 0) {
                return;
        }

        robot.keyPress(keyCodes[offset]);
        doType(keyCodes, offset + 1, length - 1);
        robot.keyRelease(keyCodes[offset]);
    }

}

要根据您的需要进行修改，您可以：

for(int i = 0; i != 3; ++i) {
doType(KeyEvent.VK_DOWN);
}

doType（KeyEvent.VK_DOWN）;会按下一次，然后释放它。

您可能会在代码中的“到目前为止，那么好......”部分之后插入它。

希望我帮忙！

Answer 2

您可以改为使用键绑定。该教程是here，直接来自Sun Java教程。他们是一种更新（并且我认为更好）的方式来实现上述目标。

如果您开始使用密钥监听器，请转到this tutorial。它解释了如何做到这一点。

我从来没有按照你的方式创建一个监听器，所以不是100％确定出了什么问题，但我认为这是因为你正在创建一个类来监听关键事件，但是你需要在某个地方使用那个类否则，它不只是去。但不确定。

更新：如上所述，在使用您的密钥监听器的类中，您要添加它吗？ addKeyListener( new MyKeyListener() );

Answer 3

KeyEvent包含键代码常量（静态int），如VK_DOWN，.VK_A，VK_0等。 如果您使用的是eclipse之类的IDE，它会在您开始输入时显示一个列表。 或者您可以在KeyEvent field summary中查看完整列表。 这可以简化您未来程序中的这种编码。

public void keyPressed(KeyEvent e) {
if(e.getKeyCode() == e.VK_DOWN){
System.out.println("So far, so good..");
}
}

Answer 4

对于对全球事件处理感兴趣的人，我完全推荐我最初发布的答案： How to detect a key press in Java