表情過濾工具

public class EmojiHelper {

    /**
     * 檢測是否有emoji字符
     *
     * @param source
     * @return
     */
    public static boolean containsEmoji(String source) {
        if (StringUtils.isBlank(source)) {
            return false;
        }
        int len = source.length();
        for (int i = 0; i < len; i++) {
            char codePoint = source.charAt(i);
            if (!isNotEmojiCharacter(codePoint)) {
                //判斷到了這裏表明，確認有表情字符
                return true;
            }
        }
        return false;
    }

    /**
     * 判斷是否爲非Emoji字符
     *
     * @param codePoint 比較的單個字符
     * @return
     */
    private static boolean isNotEmojiCharacter(char codePoint) {
        return (codePoint == 0x0) ||
                (codePoint == 0x9) ||
                (codePoint == 0xA) ||
                (codePoint == 0xD) ||
                ((codePoint >= 0x20) && (codePoint <= 0xD7FF)) ||
                ((codePoint >= 0xE000) && (codePoint <= 0xFFFD)) ||
                ((codePoint >= 0x10000) && (codePoint <= 0x10FFFF));
    }

    /**
     * 過濾emoji 或者 其他非文字類型的字符
     *
     * @param source
     * @return
     */
    public static String filterEmoji(String source) {
        if (StringUtils.isBlank(source)) {
            return source;
        }
        if (!containsEmoji(source)) {
            return source;//如果不包含，直接返回
        }
        StringBuilder buf = new StringBuilder();
        int len = source.length();
        for (int i = 0; i < len; i++) {
            char codePoint = source.charAt(i);
            if (isNotEmojiCharacter(codePoint)) {
                buf.append(codePoint);
            }
        }

        return buf.toString().trim();
    }
}