import org.springframework.util.StringUtils;public class EmojiTools {    public static boolean containsEmoji(String str) {        if (StringUtils.isEmpty(str)) {            return false;        }        for (int i = 0; i < str.length(); i++) {            int cp = str.codePointAt(i);            if (isEmojiCharacter(cp)) {                return true;            }        }        return false;    }    private static boolean isEmojiCharacter(int first) {       /* 1F30D - 1F567        1F600 - 1F636        24C2 - 1F251        1F680 - 1F6C0        2702 - 27B0        1F601 - 1F64F*/        return !                ((first == 0x0) ||                        (first == 0x9) ||                        (first == 0xA) ||                        (first == 0xD) ||                        ((first >= 0x20) && (first <= 0xD7FF)) ||                        ((first >= 0xE000) && (first <= 0xFFFD)) ||                        ((first >= 0x10000)))||                (first == 0xa9 || first == 0xae || first == 0x2122 ||                        first == 0x3030 || (first >= 0x25b6 && first <= 0x27bf) ||                        first == 0x2328 || (first >= 0x23e9 && first <= 0x23fa))                || ((first >= 0x1F000 && first <= 0x1FFFF))                || ((first >= 0x2702) && (first <= 0x27B0))                || ((first >= 0x1F601) && (first <= 0x1F64F))                ;    }    public static String filterEmoji(String str) {        if (!containsEmoji(str)) {            return str;        }else{        }        StringBuilder buf = null;        int len = str.length();        for (int i = 0; i < len; i++) {            char codePoint = str.charAt(i);            if (!isEmojiCharacter(codePoint)) {                if (buf == null) {                    buf = new StringBuilder(str.length());                }                buf.append(codePoint);            } else {            }        }        if (buf == null) {            return "";        } else {            return buf.toString();        }    }}