/**

* @Description 将字符串中的emoji表情转换成可以在utf-8字符集数据库中保存的格式(表情占4个字节，需要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) {

LOG.error("emojiConvert error", e);

throw e;

}

}

matcher.appendTail(sb);

LOG.debug("emojiConvert " + str + " to " + sb.toString()

+ ", len：" + sb.length());

return sb.toString();

}

/**

* @Description 还原utf8数据库中保存的含转换后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) {

LOG.error("emojiRecovery error", e);

throw e;

}

}

matcher.appendTail(sb);

LOG.debug("emojiRecovery " + str + " to " + sb.toString());

return sb.toString();

}

来源：https://www.cnblogs.com/shihaiming/p/5833244.html