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1.4 channel.basicAck();

deliveryTag:该消息的index
multiple：是否批量.true:将一次性ack所有小于deliveryTag的消息。

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/**
* Acknowledge one or several received
* messages. Supply the deliveryTag from the {@link com.rabbitmq.client.AMQP.Basic.GetOk}
* or {@link com.rabbitmq.client.AMQP.Basic.Deliver} method
* containing the received message being acknowledged.
* @see com.rabbitmq.client.AMQP.Basic.Ack
* @param deliveryTag the tag from the received {@link com.rabbitmq.client.AMQP.Basic.GetOk} or {@link com.rabbitmq.client.AMQP.Basic.Deliver}
* @param multiple true to acknowledge all messages up to and
* including the supplied delivery tag; false to acknowledge just
* the supplied delivery tag.
* @throws java.io.IOException if an error is encountered
*/
void basicAck(long deliveryTag, boolean multiple) throws IOException;
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1.5 channel.basicNack(delivery.getEnvelope().getDeliveryTag(), false, true);

deliveryTag:该消息的index
multiple：是否批量.true:将一次性拒绝所有小于deliveryTag的消息。
requeue：被拒绝的是否重新入队列

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/**
* Reject one or several received messages.
*
* Supply the deliveryTag from the {@link com.rabbitmq.client.AMQP.Basic.GetOk}
* or {@link com.rabbitmq.client.AMQP.Basic.GetOk} method containing the message to be rejected.
* @see com.rabbitmq.client.AMQP.Basic.Nack
* @param deliveryTag the tag from the received {@link com.rabbitmq.client.AMQP.Basic.GetOk} or {@link com.rabbitmq.client.AMQP.Basic.Deliver}
* @param multiple true to reject all messages up to and including
* the supplied delivery tag; false to reject just the supplied
* delivery tag.
* @param requeue true if the rejected message(s) should be requeued rather
* than discarded/dead-lettered
* @throws java.io.IOException if an error is encountered
*/
void basicNack(long deliveryTag, boolean multiple, boolean requeue)
throws IOException;
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1.5 channel.basicReject(delivery.getEnvelope().getDeliveryTag(), false);

deliveryTag:该消息的index
requeue：被拒绝的是否重新入队列

本文标签： 含义机制参数RabbitMQ

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