一个Java基于codePoint的emoji判断方法

该方法参考自一篇博客java判断是否是emoji字符（史上最全）_Mr.QingBin的博客-CSDN博客_java 判断emoji

经过简单封装如下：

public class EmojiFilter {
  private EmojiFilter() {
  }

  /**
   * 过滤emoji 或者 其他非文字类型的字符
   * 如果只需要判断是否含有emoji，使用hasEmoji方法更好(不需要遍历所有字符)
   *
   * @param source
   * @return
   */
  public static String filterEmoji(String source) {
    if (!StringUtils.hasText(source)) {
      return source;
    }
    StringBuilder sb = new StringBuilder();
    int len = source.length();
    for (int i = 0; i < len; i++) {
      char ch = source.charAt(i);
      if (!Character.isSurrogate(ch)) {
        //单个codepoint
        if (!isEmojiCharacter(Character.codePointAt(source, i))) {
          sb.append(ch);
        }
      } else {
        //两个codepoint
        char ch2 = source.charAt(i + 1);//低位codepoint
        if (!isEmojiCharacter(Character.codePointAt(source, i)) && Character.isSurrogatePair(ch, ch2)) {
          sb.append(ch);
          sb.append(ch2);
        }
      }
    }
    return sb.toString();
  }

  public static boolean hasEmoji(String source) {
    if (!StringUtils.hasText(source)) {
      return false;
    }
    char[] chars = source.toCharArray();
    int length = chars.length;
    for (int i = 0; i < length; i++) {
      if (isEmojiCharacter(Character.codePointAt(chars, i))) {
        return true;
      }
    }
    return false;
  }

  /*参考：
   * java判断是否是emoji字符（史上最全）_Mr.QingBin的博客-CSDN博客_java 判断emoji
      https://blog.csdn.net/congqingbin/article/details/97144558
      */
  private static boolean isEmojiCharacter(int codePoint) {
    return
            (0x0300 <= codePoint && codePoint <= 0x03FF) ||
            (0x0600 <= codePoint && codePoint <= 0x06FF) ||
            (0x0C00 <= codePoint && codePoint <= 0x0C7F) ||
            (0x1DC0 <= codePoint && codePoint <= 0x1DFF) ||
            (0x1E00 <= codePoint && codePoint <= 0x1EFF) ||
            (0x2000 <= codePoint && codePoint <= 0x209F) ||
            (0x20D0 <= codePoint && codePoint <= 0x214F) ||
            (0x2190 <= codePoint && codePoint <= 0x23FF) ||
            (0x2460 <= codePoint && codePoint <= 0x25FF) ||
            (0x2600 <= codePoint && codePoint <= 0x27EF) ||
            (0x2900 <= codePoint && codePoint <= 0x29FF) ||
            (0x2B00 <= codePoint && codePoint <= 0x2BFF) ||
            (0x2C60 <= codePoint && codePoint <= 0x2C7F) ||
            (0x2E00 <= codePoint && codePoint <= 0x2E7F) ||
            (0xA490 <= codePoint && codePoint <= 0xA4CF) ||
            (0xE000 <= codePoint && codePoint <= 0xF8FF) ||
            (0xFE00 <= codePoint && codePoint <= 0xFE0F) ||
            (0xFE30 <= codePoint && codePoint <= 0xFE4F) ||
            (0x1F000 <= codePoint && codePoint <= 0x1F02F) ||
            (0x1F0A0 <= codePoint && codePoint <= 0x1F0FF) ||
            (0x1F100 <= codePoint && codePoint <= 0x1F64F) ||
            (0x1F680 <= codePoint && codePoint <= 0x1F6FF) ||
            (0x1F910 <= codePoint && codePoint <= 0x1F96B) ||
            (0x1F980 <= codePoint && codePoint <= 0x1F9E0);
  }

}