判断字符串的编码格式并转换为UTF-8编码

判断字符串的编码格式

public static String detectEncoding(String str) {
    Charset charset = StandardCharsets.UTF_8; // 默认UTF-8编码

    if (charset.newEncoder().canEncode(str)) {
        return "UTF-8";
    }

    charset = Charset.forName("GBK"); // GBK编码

    if (charset.newEncoder().canEncode(str)) {
        return "GBK";
    }
    return "UTF-8";
}

将字符串转换为UTF-8编码

    public static String convertToUTF8(String str, String encoding) {
        byte[] byteArray;

        try {
            byteArray = str.getBytes(encoding);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }

        return new String(byteArray, StandardCharsets.UTF_8);
    }