MySQL表的编码格式为utf-8,现在表内数据量巨大，已不能新建表更改表的编码格式。
采用手动编码将有问题的数据转化为utf8进行存储
工具类

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * @author chencongcong
 * @date 2023/6/28 2:26 PM
 * @Description:
 */
public class EmojiConvertUtils {

    /**
     * 将emoji标签转换成utf8字符集保存进数据库
     *
     * @param str 待转换的字符串
     * @return emoji表情转换为utf-8
     */
    public static String emojiConvert(String str) {
        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) {
                e.printStackTrace();
            }
        }
        matcher.appendTail(sb);
        return sb.toString();
    }

    /**
     * 还原utf8数据库中保存的含转换后emoji表情的字符串
     *
     * @param str 待转换的字符串
     * @return 原emoji表情
     */
    public static String emojiRecovery(String str) {
        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) {
                return "";
            }
        }
        matcher.appendTail(sb);
        return sb.toString();
    }

运行示例 😁 🚒

    public static void main(String[] args) {
        String str = "你好\uD83D\uDE01\uD83D\uDE92";
        String result = EmojiConvertUtils.emojiConvert(str);
        System.out.println(result);
        String recovery = EmojiConvertUtils.emojiRecovery(result);
        System.out.println(recovery);
    }