java完美处理表情符

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~~

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版权声明：本文为CSDN博主「wangdan199112」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/wangdan199112/java/article/details/53290154