Question

如何更改生成的KeyEvent的字段？

键盘上的实际KeyEvent

java.awt.event.KeyEvent[KEY_PRESSED,
keyCode=65,
keyText=A,
keyChar='a',
keyLocation=KEY_LOCATION_STANDARD,
rawCode=65,
primaryLevelUnicode=97,
scancode=30,
extendedKeyCode=0x41] on panel0

Generated KeyEvent

java.awt.event.KeyEvent[KEY_PRESSED,
keyCode=65,
keyText=A,
keyChar='a',
keyLocation=KEY_LOCATION_STANDARD,
rawCode=0,
primaryLevelUnicode=0,
scancode=0,
extendedKeyCode=0x0] on panel0

new KeyEvent(component, KeyEvent.KEY_PRESSED, System.currentTimeMillis(), 0, 65, 'a')

差分

rawCode
primaryLevelUnicode
scancode
extendedKeyCode

有没有办法在KeyEvent对象上设置这些字段？

文档https://docs.oracle.com/javase/7/docs/api/java/awt/event/KeyEvent.html

Answer 1

查看KeyEvent课程中的来源，看来你无法设置：

//set from native code.
private transient long rawCode = 0;
private transient long primaryLevelUnicode = 0;
private transient long scancode = 0; // for MS Windows only
private transient long extendedKeyCode = 0;

它是私有的，并且是从本机代码设置的（所以Java中没有变化）。

Answer 2

您可以使用反射：

     KeyEvent m = new KeyEvent(component, type, System.currentTimeMillis(), 0, ext,(char)key, KEY_LOCATION_STANDARD);
     try
     {
        Field f = m.getClass().getDeclaredField("rawCode");
        f.setAccessible(true);
        f.setLong(m, key);
        f = m.getClass().getDeclaredField("primaryLevelUnicode");
        f.setAccessible(true);
        f.setLong(m, key);
        f = m.getClass().getDeclaredField("scancode");
        f.setAccessible(true);
        f.setLong(m, scanCode);
     }
     catch (Exception e)
     {
        e.printStackTrace();
     }

使用特定字段创建KeyEvent

2 个答案: