波场签名字符串java版本有人写过吗，求

static signString(message, privateKey, useTronHeader = true) {
        message = message.replace(/^0x/, '');
        const value ={
            toHexString: function() {
                return '0x' + privateKey
            },
            value: privateKey
        }
        const signingKey = new SigningKey(value);
        const messageBytes = [
            ...toUtf8Bytes(useTronHeader ? TRX_MESSAGE_HEADER : ETH_MESSAGE_HEADER),
            ...utils.code.hexStr2byteArray(message)
        ];
        const messageDigest = keccak256(messageBytes);
        const signature = signingKey.(messageDigest);
        const signatureHex = [
            '0x',
            signature.r.substring(2),
            signature.s.substring(2),
            Number(signature.v).toString(16)
        ].join('');
        return signatureHex
    }