话题模式
话题模式主要使用routingKey来进行路由匹配，匹配规则如下，
要注意key规则 其中"*"用于匹配一个单词， "#"用于匹配多个单词(可以是零) 匹配imooc.* 表示可以匹配 imooc.hello ,但是imooc.hello.one需要使用imooc.#才可以匹配到
话题模式创建RabbitMq实例
func NewRabbitMqTopic(exchangeName, routingKey string)*RabbitMq{
return NewRabbitMq("", exchangeName, routingKey)
}生产者
1、尝试创建交换机，topic模式，
2、发送消息传入交换机和key
func (r *RabbitMq)PublishTopic(message string){
//1. 尝试创建交换机
err := r.channel.ExchangeDeclare(
r.Exchange,
"topic",
//是否持久化
false,
//
false,
false,
false,
nil)
r.failOnErr(err, "failed to declare an exchange")
//2. 发送消息
r.channel.Publish(
//交换机
r.Exchange, //简单模式为空
//key
r.Key,
false,
false,
//发送的信息
amqp.Publishing{
ContentType: "text/plain",
Body: []byte(message),
})
}消费者
1、尝试创建交换机, 模式为topic，传入exchange
2、申请队列，队列名称为空
3、绑定队列传入队列名称，key，交换机
4、channel.Consume消费消息
func(r *RabbitMq)RecivedTopic(){
//尝试创建交换机
err := r.channel.ExchangeDeclare(
r.Exchange,
"topic",
//是否持久化
false,
//
false,
false,
false,
nil)
r.failOnErr(err, "failed to declare an exchange")
//2 尝试创建队列
q, err := r.channel.QueueDeclare(
"",
false,
false,
true,
false,
nil)
r.failOnErr(err, "failed to declare an queue")
//3 绑定队列到exchange中
err = r.channel.QueueBind(
q.Name,
r.Key,
r.Exchange,
false,
nil)
//消费消息
msgs, err := r.channel.Consume(
q.Name,
"",
true,
false,
false,
false,
nil)
if err != nil {
fmt.Printf("channel.Consume failed, error:%+v\n", err)
return
}
forever := make(chan bool)
go func() {
for d := range msgs {
//实现我们要处理的逻辑函数
log.Printf("Received a message:%s", d.Body)
}
}()
log.Printf("[*] Waiting for message, exit to press CTRL + C")
<-forever
}使用案例
生产者
package main
import (
"rabbitmq/RabbitMq"
"strconv"
"time"
)
func main() {
imoocOne := RabbitMq.NewRabbitMqTopic("exImoocTopic", "imooc.topic.one")
imoocTwo := RabbitMq.NewRabbitMqRouting("exImoocTopic", "imooc.topic.two")
for i := 0; i < 10; i++ {
imoocOne.PublishTopic("imooc topic one " + strconv.Itoa(i))
imoocTwo.PublishTopic("imooc topic two " + strconv.Itoa(i))
time.Sleep(10 * time.Millisecond)
}
}消费者
package main
import "rabbitmq/RabbitMq"
func main(){
rabbitmq := RabbitMq.NewRabbitMqRouting("exImoocTopic", "#")
rabbitmq.RecivedTopic()
}
=========================================================
package main
import (
"rabbitmq/RabbitMq"
)
func main(){
rabbitmq := RabbitMq.NewRabbitMqRouting("exImoocTopic", "imooc.*.two")
rabbitmq.RecivedTopic()
}分析
1、生产者者创建两个rabbitmq实例交换机名称为exImoocTopic，routingKey为imooc.topic.one 和 imooc.topic.two
2、消费者1的routingKey为#， 消费者2的routingKey为imooc.*.two，
3、消费者1可以获取到所有的路由的消息，消费者2可以获取到格式为imooc.topic.two的消息，实际消费可以消费imooc.[任意].two的消息，只是在本案例中只能消费imooc.topic.two的消息
输出结果
消费者1输出结果
2019/07/04 12:05:57 [*] Waiting for message, exit to press CTRL + C
2019/07/04 12:06:04 Received a message:imooc topic one 0
2019/07/04 12:06:04 Received a message:imooc topic two 0
2019/07/04 12:06:04 Received a message:imooc topic one 1
2019/07/04 12:06:04 Received a message:imooc topic two 1
2019/07/04 12:06:04 Received a message:imooc topic one 2
2019/07/04 12:06:04 Received a message:imooc topic two 2
2019/07/04 12:06:04 Received a message:imooc topic one 3
2019/07/04 12:06:04 Received a message:imooc topic two 3
2019/07/04 12:06:04 Received a message:imooc topic one 4
2019/07/04 12:06:04 Received a message:imooc topic two 4
2019/07/04 12:06:04 Received a message:imooc topic one 5
2019/07/04 12:06:04 Received a message:imooc topic two 5
2019/07/04 12:06:04 Received a message:imooc topic one 6
2019/07/04 12:06:04 Received a message:imooc topic two 6
2019/07/04 12:06:04 Received a message:imooc topic one 7
2019/07/04 12:06:04 Received a message:imooc topic two 7
2019/07/04 12:06:04 Received a message:imooc topic one 8
2019/07/04 12:06:04 Received a message:imooc topic two 8
2019/07/04 12:06:04 Received a message:imooc topic one 9
2019/07/04 12:06:04 Received a message:imooc topic two 9消费者2输出结果
2019/07/04 12:06:01 [*] Waiting for message, exit to press CTRL + C
2019/07/04 12:06:04 Received a message:imooc topic two 0
2019/07/04 12:06:04 Received a message:imooc topic two 1
2019/07/04 12:06:04 Received a message:imooc topic two 2
2019/07/04 12:06:04 Received a message:imooc topic two 3
2019/07/04 12:06:04 Received a message:imooc topic two 4
2019/07/04 12:06:04 Received a message:imooc topic two 5
2019/07/04 12:06:04 Received a message:imooc topic two 6
2019/07/04 12:06:04 Received a message:imooc topic two 7
2019/07/04 12:06:04 Received a message:imooc topic two 8
2019/07/04 12:06:04 Received a message:imooc topic two 9
