import org.apache.james.mime4j.stream.EntityState; //导入依赖的package包/类
private int receivedHeaderCount(MailData data) throws IOException,
        MimeException {
    int count = 0;
    MimeTokenStream stream = new MimeTokenStream();
    stream.parse(data.getInputStream());
    for (EntityState state = stream.getState(); state != EntityState.T_END_OF_STREAM; state =
            stream.next()) {
        switch (state) {
        case T_FIELD:
            if ("Received".equalsIgnoreCase(stream.getField().getName()))
                count++;
            break;
        case T_END_HEADER:
            stream.stop();
            break;
        }
    }
    return count;
}