RabbitMQ Producer Properties
在使用 Spring Cloud Stream 与 RabbitMQ 集成时，可以单独为每个通道设置属性，也可以将属性设置为所有通道的默认值，避免重复配置。特定绑定属性的值将覆盖其在默认值中的同等值。
以下属性仅适用于 Rabbit 生产者，且必须使用 spring.cloud.stream.rabbit.bindings.<channelName>.producer. 前缀。
然而，如果需要将同一组属性应用于大多数绑定，可通过 Spring Cloud Stream 设置所有通道的值（格式为 spring.cloud.stream.rabbit.default.<property>=<value>），避免重复。
另外，请记住，特定绑定属性的值将覆盖其在默认值中的等值。
- altermateExchange.binding.queue
-
If the exchange does not already exist, and a
nameis provided, bind this queue to the alternate exhange. A simple durable queue with no arguments is provisioned; if more sophisticated configuration is required, you must configure and bind the queue yourself.默认：
nullalternateExchange.binding.routingKey，如果交换机还不存在，且提供了name和queue，则使用此路由键将队列绑定到备用交换机。 默认：#（为默认topic备用交换机） - alternateExchange.exists
-
Whether the alternate exchange exists, or needs to be provisioned.
默认值：
false - alternateExchange.type
-
If the alternate exchange does not already exist, the type of exchange to provision.
默认：
topic - alternateExchange.name
-
Configure an alternate exchange on the destination exchange.
默认值：
null - autoBindDlq
-
Whether to automatically declare the DLQ and bind it to the binder DLX.
默认：
false. - batchingEnabled
-
Whether to enable message batching by producers. Messages are batched into one message according to the following properties (described in the next three entries in this list): 'batchSize',
batchBufferLimit, andbatchTimeout. See Batching for more information. Also see Receiving Batched Messages.默认：
false. - batchSize
-
The number of messages to buffer when batching is enabled.
默认：
100。 - batchBufferLimit
-
The maximum buffer size when batching is enabled.
默认值：
10000。 - batchTimeout
-
The batch timeout when batching is enabled.
默认：
5000。 - bindingRoutingKey
-
The routing key with which to bind the queue to the exchange (if
bindQueueistrue). Can be multiple keys - seebindingRoutingKeyDelimiter. For partitioned destinations,-nis appended to each key. Only applies ifrequiredGroupsare provided and then only to those groups.默认：
#。 - bindingRoutingKeyDelimiter
-
When this is not null, 'bindingRoutingKey' is considered to be a list of keys delimited by this value; often a comma is used. Only applies if
requiredGroupsare provided and then only to those groups.默认值：
null。 - bindQueue
-
Whether to declare the queue and bind it to the destination exchange. Set it to
falseif you have set up your own infrastructure and have previously created and bound the queue. Only applies ifrequiredGroupsare provided and then only to those groups.默认：“true”。
- compress
-
Whether data should be compressed when sent.
默认：
false. - confirmAckChannel
-
When
errorChannelEnabledis true, a channel to which to send positive delivery acknowledgments (aka publisher confirms). If the channel does not exist, aDirectChannelis registered with this name. The connection factory must be configured to enable publisher confirms. Mutually exclusive withuseConfirmHeader.默认：
nullChannel（丢弃 ack）。 - deadLetterQueueName
-
The name of the DLQ Only applies if
requiredGroupsare provided and then only to those groups.默认：
prefix+destination.dlq - deadLetterExchange
-
A DLX to assign to the queue. Relevant only when
autoBindDlqistrue. Applies only whenrequiredGroupsare provided and then only to those groups.默认：
prefix+DLX - deadLetterExchangeType
-
The type of the DLX to assign to the queue. Relevant only if
autoBindDlqistrue. Applies only whenrequiredGroupsare provided and then only to those groups.默认：
direct - deadLetterRoutingKey
-
A dead letter routing key to assign to the queue. Relevant only when
autoBindDlqistrue. Applies only whenrequiredGroupsare provided and then only to those groups.默认：
destination - declareDlx
-
Whether to declare the dead letter exchange for the destination. Relevant only if
autoBindDlqistrue. Set tofalseif you have a pre-configured DLX. Applies only whenrequiredGroupsare provided and then only to those groups.默认：“true”。
- declareExchange
-
Whether to declare the exchange for the destination.
默认：“true”。
- delayExpression
-
A SpEL expression to evaluate the delay to apply to the message (
x-delayheader). It has no effect if the exchange is not a delayed message exchange.默认：未设置
x-delay标头。 - delayedExchange
-
Whether to declare the exchange as a
Delayed Message Exchange. Requires the delayed message exchange plugin on the broker. Thex-delayed-typeargument is set to theexchangeType.默认：
false. - deliveryMode
-
The delivery mode.
默认值：
PERSISTENT。 - dlqBindingArguments
-
Arguments applied when binding the dlq to the dead letter exchange; used with
headersdeadLetterExchangeTypeto specify headers to match on. For example…dlqBindingArguments.x-match=any,…dlqBindingArguments.someHeader=someValue. Applies only whenrequiredGroupsare provided and then only to those groups.默认值：空
- dlqDeadLetterExchange
-
When a DLQ is declared, a DLX to assign to that queue. Applies only if
requiredGroupsare provided and then only to those groups.默认值：
none - dlqDeadLetterRoutingKey
-
When a DLQ is declared, a dead letter routing key to assign to that queue. Applies only when
requiredGroupsare provided and then only to those groups.默认值：
none - dlqExpires
-
How long (in milliseconds) before an unused dead letter queue is deleted. Applies only when
requiredGroupsare provided and then only to those groups.默认值：
no expiration - dlqLazy
-
Declare the dead letter queue with the
x-queue-mode=lazyargument. See “Lazy Queues”. Consider using a policy instead of this setting, because using a policy allows changing the setting without deleting the queue. Applies only whenrequiredGroupsare provided and then only to those groups. - dlqMaxLength
-
Maximum number of messages in the dead letter queue. Applies only if
requiredGroupsare provided and then only to those groups.默认值：
no limit - dlqMaxLengthBytes
-
Maximum number of total bytes in the dead letter queue from all messages. Applies only when
requiredGroupsare provided and then only to those groups.默认值：
no limit - dlqMaxPriority
-
Maximum priority of messages in the dead letter queue (0-255) Applies only when
requiredGroupsare provided and then only to those groups.默认值：
none - dlqQuorum.deliveryLimit
-
When
quorum.enabled=true, set a delivery limit after which the message is dropped or dead-lettered. Applies only whenrequiredGroupsare provided and then only to those groups.默认值：无，将应用代理默认值。
- dlqQuorum.enabled
-
When true, create a quorum dead letter queue instead of a classic queue. Applies only when
requiredGroupsare provided and then only to those groups.默认值：false
- dlqQuorum.initialGroupSize
-
When
quorum.enabled=true, set the initial quorum size. Applies only whenrequiredGroupsare provided and then only to those groups.默认值：无，将应用代理默认值。
- dlqSingleActiveConsumer
-
Set to true to set the
x-single-active-consumerqueue property to true. Applies only whenrequiredGroupsare provided and then only to those groups.默认值：
false - dlqTtl
-
Default time (in milliseconds) to live to apply to the dead letter queue when declared. Applies only when
requiredGroupsare provided and then only to those groups.默认值：
no limit - exchangeAutoDelete
-
If
declareExchangeistrue, whether the exchange should be auto-delete (it is removed after the last queue is removed).默认：“true”。
- exchangeDurable
-
If
declareExchangeistrue, whether the exchange should be durable (survives broker restart).默认：“true”。
- exchangeType
-
The exchange type:
direct,fanout,headersortopicfor non-partitioned destinations anddirect,headersortopicfor partitioned destinations.默认值：
topic。 - expires
-
How long (in milliseconds) before an unused queue is deleted. Applies only when
requiredGroupsare provided and then only to those groups.默认值：
no expiration - headerPatterns
-
Patterns for headers to be mapped to outbound messages.
默认值：
['*']（所有头）。 - lazy
-
Declare the queue with the
x-queue-mode=lazyargument. See “Lazy Queues”. Consider using a policy instead of this setting, because using a policy allows changing the setting without deleting the queue. Applies only whenrequiredGroupsare provided and then only to those groups.默认：
false. - maxLength
-
Maximum number of messages in the queue. Applies only when
requiredGroupsare provided and then only to those groups.默认值：
no limit - maxLengthBytes
-
Maximum number of total bytes in the queue from all messages. Only applies if
requiredGroupsare provided and then only to those groups.默认值：
no limit - maxPriority
-
Maximum priority of messages in the queue (0-255). Only applies if
requiredGroupsare provided and then only to those groups.默认值：
none - prefix
-
A prefix to be added to the name of the
destinationexchange.默认值：""。
- producerType
-
The type of producer.
-
`AMQP`经典队列和仲裁队列的 AMQP 客户端
-
`STREAM_SYNC`RabbitMQ Streams 插件客户端，在收到确认之前会阻塞
-
`STREAM_ASYNC`RabbitMQ Streams 插件客户端，不阻塞默认值：""。
-
- queueBindingArguments
-
Arguments applied when binding the queue to the exchange; used with
headersexchangeTypeto specify headers to match on. For example…queueBindingArguments.x-match=any,…queueBindingArguments.someHeader=someValue. Applies only whenrequiredGroupsare provided and then only to those groups.默认值：空
- queueNameGroupOnly
-
When
true, consume from a queue with a name equal to thegroup. Otherwise the queue name isdestination.group. This is useful, for example, when using Spring Cloud Stream to consume from an existing RabbitMQ queue. Applies only whenrequiredGroupsare provided and then only to those groups.默认值：false。
- quorum.deliveryLimit
-
When
quorum.enabled=true, set a delivery limit after which the message is dropped or dead-lettered. Applies only whenrequiredGroupsare provided and then only to those groups.默认值：无，将应用代理默认值。
- quorum.enabled
-
When true, create a quorum queue instead of a classic queue. Applies only when
requiredGroupsare provided and then only to those groups.默认值：false
- quorum.initialGroupSize
-
When
quorum.enabled=true, set the initial quorum size. Applies only whenrequiredGroupsare provided and then only to those groups.默认值：无，将应用代理默认值。
- routingKeyExpression
-
A SpEL expression to determine the routing key to use when publishing messages. For a fixed routing key, use
routingKey.默认值：对于已分区的目标，为
destination或destination-<partition>。 - routingKey
-
A string defining a fixed routing key to use when publishing messages.
默认值：请参阅
routingKeyExpression。 - singleActiveConsumer
-
Set to true to set the
x-single-active-consumerqueue property to true. Applies only whenrequiredGroupsare provided and then only to those groups.默认值：
false - transacted
-
Whether to use transacted channels.
默认：
false. - ttl
-
Default time (in milliseconds) to live to apply to the queue when declared. Applies only when
requiredGroupsare provided and then only to those groups.默认值：
no limit - useConfirmHeader
-
See Publisher Confirms. Mutually exclusive with
confirmAckChannel.就 RabbitMQ 而言，外部应用程序可以设置内容类型标头。Spring Cloud Stream 将它们作为用于任何类型的传输的扩展内部协议的一部分提供支持——包括 本身不支持标头的传输（例如早期的 Kafka（介于 0.11 之前））。