kafka源码中有这样一段代码：
org.apache.kafka.clients.producer.KafkaProducer

 private static int parseAcks(String acksString) {try {return acksString.trim().equalsIgnoreCase("all") ? -1 : Integer.parseInt(acksString.trim());} catch (NumberFormatException var2) {throw new ConfigException("Invalid configuration value for 'acks': " + acksString);}}```