Java 21 增强对 Emoji 表情符号的处理了

2023-11-24 17:49:31 浏览数 (2)

发现一个 Java 21 中有意思的东西!在java.Lang.Character类中增加了用于确定字符是否为 Emoji 表情符号的 API,主要包含下面六个新的静态方法:

代码语言:javascript复制
public static boolean isEmoji(int codePoint) {
  return CharacterData.of(codePoint).isEmoji(codePoint);
}

public static boolean isEmojiPresentation(int codePoint) {
  return CharacterData.of(codePoint).isEmojiPresentation(codePoint);
}

public static boolean isEmojiModifier(int codePoint) {
  return CharacterData.of(codePoint).isEmojiModifier(codePoint);
}

public static boolean isEmojiModifierBase(int codePoint) {
  return CharacterData.of(codePoint).isEmojiModifierBase(codePoint);
}
  
public static boolean isEmojiComponent(int codePoint) {
  return CharacterData.of(codePoint).isEmojiComponent(codePoint);
}

public static boolean isExtendedPictographic(int codePoint) {
  return CharacterData.of(codePoint).isExtendedPictographic(codePoint);
}

这些静态方法通过接收字符的codePoint来判断是否为表情符号来返回boolean值。

所以,我们可以用isEmoji方法来判断字符串中是否有表情,比如:

代码语言:javascript复制
@Test
void testEmoji() {
  String message = "欢迎来到 www.didispace.com ❤️,要不要来杯 ☕️ ?";
  if(message.codePoints().anyMatch(Character::isEmoji)) {
    System.out.println("Message包含表情");
  }
}

除了判断字符串中是否包含表情符号之外,还能用isEmojiModifierisEmojiModifierBase来判断Emoji是否被修改和是否可以被修改:

代码语言:javascript复制
@Test
void testEmoji2() {
  String welcomeMsg ="欢迎来到 www.didispace.com ❤️,要不要来杯 ☕️ ?";
  OptionalInt emojiOptional = welcomeMsg.codePoints().filter(Character::isEmoji).findFirst();
  if (emojiOptional.isPresent()) {
    int emojiCodePoint = emojiOptional.getAsInt();
    if (Character.isEmojiModifierBase(emojiCodePoint)) {
      System.out.println("Emoji can be modified");
      if (Character.isEmojiModifier(emojiCodePoint))
        System.out.println("Emoji is modified");
      else
        System.out.println("Emoji has not been modified");
    } else
      System.out.println("Emoji cannot be modified");
  } else
    System.out.println("No emoji present");
}

这些新方法也可以通过属性构造正则表达式来使用,比如:

代码语言:javascript复制
String welcomeMsg = "欢迎来到 www.didispace.com ❤️,要不要来杯 ☕️ ?";

Matcher matcher = Pattern.compile("\p{IsEmoji}").matcher(welcomeMsg);

if(matcher.find()) {
 System.out.println("Message contains an emoji!");
}

matcher = Pattern.compile("\p{IsEmoji_Modifier_Base}").matcher(welcomeMsg);

if(matcher.find()) {
 System.out.println("Message contains an emoji modifier base!");
}

0 人点赞