将字符转换为Java KeyEvent KeyCode

Question

我正在编写一个基本程序，要求用户输入一个字符串，我正在尝试使用一个Robot（来自java.awt.Robot）在延迟后将此消息输入到另一个文档中。现在的问题是，我需要转换从消息中获得的任何内容。charAt（i）到按键事件。VK_u[插入字符]KeyCode。有没有更好的方法来做我想做的事情？我想我总是可以有一个巨大的switch语句来获得适当的键码，但我希望有一种更优雅的方式。在使用python一段时间后，我的第一个想法是生成一个字符串“KeyEvent.VK_2;”消息。charAt（i）并以某种方式将其转换为代码，但我认为唯一的方法是使用反射，这是不鼓励的。

Answer 1

更详细但更可定制

import java.awt.AWTException;
import java.awt.Robot;
import java.awt.event.KeyEvent;
import java.util.HashMap;
import java.util.Map;

public class AsciiKeyTyper {

    private Map<Character,KeyStroke> strokeMap;
    private Robot robot;
    public AsciiKeyTyper() throws AWTException{
        robot=new Robot();
        //initialize a map from the input char to the keystroke,
        //using the fact that sometimes the KeyEvent key codes correspond to ASCII
        strokeMap=new HashMap<Character,KeyStroke>(){
                private static final long serialVersionUID = 1L;{
            put('\n',new KeyStroke(KeyEvent.VK_ENTER,false));
            put('\t',new KeyStroke(KeyEvent.VK_TAB,false));
            put('\r',new KeyStroke(KeyEvent.VK_HOME,false));
            put(' ',new KeyStroke(KeyEvent.VK_SPACE,false));
            put('!',new KeyStroke(KeyEvent.VK_1,true));
            put('"',new KeyStroke(KeyEvent.VK_QUOTE,true));
            put('#',new KeyStroke(KeyEvent.VK_3,true));
            put('$',new KeyStroke(KeyEvent.VK_4,true));
            put('%',new KeyStroke(KeyEvent.VK_5,true));
            put('&',new KeyStroke(KeyEvent.VK_7,true));
            put('\'',new KeyStroke(KeyEvent.VK_QUOTE,false));
            put('(',new KeyStroke(KeyEvent.VK_9,true));
            put(')',new KeyStroke(KeyEvent.VK_0,true));
            put('*',new KeyStroke(KeyEvent.VK_8,true));
            put('+',new KeyStroke(KeyEvent.VK_EQUALS,true));
            put(',',new KeyStroke(KeyEvent.VK_COMMA,false));
            put('-',new KeyStroke(KeyEvent.VK_MINUS,false));
            put('.',new KeyStroke(KeyEvent.VK_PERIOD,false));
            put('/',new KeyStroke(KeyEvent.VK_SLASH,false));
            for(int i=(int)'0';i<=(int)'9';i++){
                put((char)i,new KeyStroke(i,false));
            }
            put(':',new KeyStroke(KeyEvent.VK_SEMICOLON,true));
            put(';',new KeyStroke(KeyEvent.VK_SEMICOLON,false));
            put('<',new KeyStroke(KeyEvent.VK_COMMA,true));
            put('=',new KeyStroke(KeyEvent.VK_EQUALS,false));
            put('>',new KeyStroke(KeyEvent.VK_PERIOD,true));
            put('?',new KeyStroke(KeyEvent.VK_SLASH,true));
            put('@',new KeyStroke(KeyEvent.VK_2,true));
            for(int i=(int)'A';i<=(int)'Z';i++){
                put((char)i,new KeyStroke(i,true));
            }
            put('[',new KeyStroke(KeyEvent.VK_OPEN_BRACKET,false));
            put('\\',new KeyStroke(KeyEvent.VK_BACK_SLASH,false));
            put(']',new KeyStroke(KeyEvent.VK_CLOSE_BRACKET,false));
            put('^',new KeyStroke(KeyEvent.VK_6,true));
            put('_',new KeyStroke(KeyEvent.VK_MINUS,true));
            put('`',new KeyStroke(KeyEvent.VK_BACK_QUOTE,false));
            for(int i=(int)'A';i<=(int)'Z';i++){
                put((char)(i+((int)'a'-(int)'A')),new KeyStroke(i,false));
            }
            put('{',new KeyStroke(KeyEvent.VK_OPEN_BRACKET,true));
            put('|',new KeyStroke(KeyEvent.VK_BACK_SLASH,true));
            put('}',new KeyStroke(KeyEvent.VK_CLOSE_BRACKET,true));
            put('~',new KeyStroke(KeyEvent.VK_BACK_QUOTE,true));
        }};
    }
    public void typeKey(char key){
        try{
            strokeMap.get(key).type();
        }catch(NullPointerException ex){
            System.err.println("'"+key+"': no such key in mappings");
        }
    }
    private class KeyStroke{
        int code;
        boolean isShifted;
        public KeyStroke(int keyCode,boolean shift){
            code=keyCode;
            isShifted=shift;
        }
        public void type(){
            try{
                if (isShifted) {
                    robot.keyPress(KeyEvent.VK_SHIFT);
                }
                robot.keyPress(code);
                robot.keyRelease(code);
                if (isShifted) {
                    robot.keyRelease(KeyEvent.VK_SHIFT);
                }
                if(code==KeyEvent.VK_ENTER){
                    robot.keyPress(KeyEvent.VK_HOME);
                    robot.keyRelease(KeyEvent.VK_HOME);
                }

            }catch(IllegalArgumentException ex){
                String ch="";
                for(char key:strokeMap.keySet()){
                    if(strokeMap.get(key)==this){
                        ch=""+key;
                        break;
                    }
                }
                System.err.println("Key Code Not Recognized: '"+ch+"'->"+code);
            }
        }
    }
}

Answer 2

你可以用这个解决问题：

KeyStroke ks = KeyStroke.getKeyStroke('k', 0);
System.out.println(ks.getKeyCode());

或者就用这个：

private void writeString(String s) {
    for (int i = 0; i < s.length(); i++) {
        char c = s.charAt(i);
        if (Character.isUpperCase(c)) {
            robot.keyPress(KeyEvent.VK_SHIFT);
        }
        robot.keyPress(Character.toUpperCase(c));
        robot.keyRelease(Character.toUpperCase(c));

        if (Character.isUpperCase(c)) {
            robot.keyRelease(KeyEvent.VK_SHIFT);
        }
    }
    robot.delay(delay);
}

Answer 3

如果我有一个unicode字符，我只想知道它的击键方式，那么我使用

int keyCode = java.awt.event.KeyEvent.getExtendedKeyCodeForChar(charCode);

我从来都不需要另一种更复杂的方法。