关于java:java-将表情转换成字符串存入数据库

/**    * @Description 将字符串中的emoji表情转换成能够在utf-8字符集数据库中保留的格局（表情占4个字节，须要utf8mb4字符集）    * @param str    * 待转换字符串    * @return 转换后字符串    * @throws UnsupportedEncodingException    * exception    */    public static String emojiConvert1(String str)    throws UnsupportedEncodingException {        String patternString = "([\\x{10000}-\\x{10ffff}\ud800-\udfff])";            Pattern pattern = Pattern.compile(patternString);        Matcher matcher = pattern.matcher(str);        StringBuffer sb = new StringBuffer();        while(matcher.find()) {            try {                matcher.appendReplacement(                sb,                "[["                + URLEncoder.encode(matcher.group(1),                "UTF-8") + "]]");            } catch(UnsupportedEncodingException e) {                System.out.println(e);                throw e;            }        }        matcher.appendTail(sb);        System.out.println("emojiConvert " + str + " to " + sb.toString()        + ", len：" + sb.length());        return sb.toString();    }    /**    * @Description 还原utf8数据库中保留的含转换后emoji表情的字符串    * @param str    * 转换后的字符串    * @return 转换前的字符串    * @throws UnsupportedEncodingException    * exception    */    public static String emojiRecovery2(String str)        throws UnsupportedEncodingException {        String patternString = "\\[\\[(.*?)\\]\\]";            Pattern pattern = Pattern.compile(patternString);        Matcher matcher = pattern.matcher(str);            StringBuffer sb = new StringBuffer();        while(matcher.find()) {            try {                matcher.appendReplacement(sb,                URLDecoder.decode(matcher.group(1), "UTF-8"));            } catch(UnsupportedEncodingException e) {                System.out.println(e);                throw e;            }        }        matcher.appendTail(sb);        System.out.println("emojiRecovery " + str + " to " + sb.toString());        return sb.toString();    }