java完美处理表情符

ゝ一世哀愁。 2022-07-14 01:27 159阅读 0赞

遇到这个问题是在测试时发现用的是mysql，字符集为utf8，查到各路大神的办法，需要修改表的字符集为utf8mb4，但是试了很多次，无果~  
于是尝试用java来实现，其实主要就是入库时用正则将表情转为字符，然后从库中取出时为string:

/** * 将str中的emoji表情转为byte数组 * * @param str * @return */
        public static String resolveToByteFromEmoji(String str) {
            Pattern pattern = Pattern
                    .compile("[^(\u2E80-\u9FFF\\w\\s`~!@#\\$%\\^&\\*\$\$_+-？（）——=\\[\\]{}\\|;。，、《》”：；“！……’:'\"<,>\\.?/\\\\*)]");
            Matcher matcher = pattern.matcher(str);
            StringBuffer sb2 = new StringBuffer();
            while (matcher.find()) {
                matcher.appendReplacement(sb2, resolveToByte(matcher.group(0)));
            }
            matcher.appendTail(sb2);
            return sb2.toString();
        }
    
        /** * 将str中的byte数组类型的emoji表情转为正常显示的emoji表情 * * @param str * @return */
        public static String resolveToEmojiFromByte(String str) {
            Pattern pattern2 = Pattern.compile("<:([[-]\\d*[,]]+):>");
            Matcher matcher2 = pattern2.matcher(str);
            StringBuffer sb3 = new StringBuffer();
            while (matcher2.find()) {
                matcher2.appendReplacement(sb3, resolveToEmoji(matcher2.group(0)));
            }
            matcher2.appendTail(sb3);
            return sb3.toString();
        }
    
        private static String resolveToByte(String str) {
            byte[] b = str.getBytes();
            StringBuffer sb = new StringBuffer();
            sb.append("<:");
            for (int i = 0; i < b.length; i++) {
                if (i < b.length - 1) {
                    sb.append(Byte.valueOf(b[i]).toString() + ",");
                } else {
                    sb.append(Byte.valueOf(b[i]).toString());
                }
            }
            sb.append(":>");
            return sb.toString();
        }
    
        private static String resolveToEmoji(String str) {
            str = str.replaceAll("<:", "").replaceAll(":>", "");
            String[] s = str.split(",");
            byte[] b = new byte[s.length];
            for (int i = 0; i < s.length; i++) {
                b[i] = Byte.valueOf(s[i]);
            }
            return new String(b);
        }

因为表情都是有规律的，都是以<:开始:>结束~所以自然就有办法解决啦~~