[英]Converting a Char into Java KeyEvent KeyCode
我正在編寫一個基本程序,要求用戶鍵入一個字符串,我正在嘗試使用一個Robot(來自java.awt.Robot
),它將在延遲后將此消息鍵入另一個文檔。 我現在遇到的問題是我需要將從message.charAt(i)
獲得的任何內容轉換為KeyEvent.VK_[insert Char]
KeyCode。 有沒有更好的方法來做我想做的事情? 我想我總是可以得到一個大規模的switch語句來獲得適當的KeyCode,但我希望有一個更優雅的方式。 我第一次想到,已經做了一段時間的python,就是創建一個字符串"KeyEvent.VK_" + message.charAt(i)
並以某種方式將其轉換為代碼,但我認為唯一的方法是使用不鼓勵的反射。
如果我有一個unicode角色,我只想知道它的擊鍵,那么我就用了
int keyCode = java.awt.event.KeyEvent.getExtendedKeyCodeForChar(charCode);
我從來沒有需要另一種更復雜的方法來做到這一點。
你可以用這個來解決問題:
KeyStroke ks = KeyStroke.getKeyStroke('k', 0);
System.out.println(ks.getKeyCode());
或者只是使用這個:
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);
}
更冗長但更可定制
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);
}
}
}
}
用反射!
KeyEvent.class.getField("VK_"+keyName);
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