spring-cloud-stream的手動消息確認問題

更新時間：2023年05月25日 14:38:27 作者：l1161558158

這篇文章主要介紹了spring-cloud-stream的手動消息確認問題，具有很好的參考價值，希望對大家有所幫助。如有錯誤或未考慮完全的地方，望不吝賜教

spring-cloud-stream的手動消息確認

對于kafka-binder來說,設置autoCommitOffset為false.然后在listen中手動確認

@StreamListener(Sink.INPUT)
void listen(@Header(KafkaHeaders.ACKNOWLEDGMENT) Acknowledgment acknowledgment){
? ? //...業(yè)務代碼
? ? acknowledgment.acknowledge();
}

需要注意的是autoCommitOffset的設置位置.

spring.cloud.stream.kafka.bindings.input.consumer.autoCommitOffset=false#應該在這里設置
spring.cloud.stream.bindings.input.consumer.autoCommitOffset=false#這里設置是無效的,獲取Acknowledgment時會是null

springcloud的stream消息組件的使用@StreamListener

常見問題（使用rabbitmq）

消息分組防止多實例重復消費

在一個服務多實例場景下使用默認使用@StreamListener監(jiān)聽消息消費，yml中沒有特殊配置的話是會導致消息重復消費的，原因是此時每個實例都是匿名在rabbitmq上注冊的隊列，需要給消費者指定一個消費組，讓消息在組里只被消費一次；

spring.cloud.stream.bindings.xxx(消費者隊列名).group=xxx(組名)

在springboot下在同一個服務（項目中）使用@input和@outPut時指定的隊列名是不可以重復的.會在啟動編譯的時候報bean定義重復。需要在yml給生產(chǎn)者和消費者指定同一個交換機。

spring:
  rabbitmq:
    host: xxx.xxx.xxx.xx
    port: 35672
    username: xxx
    password: xxx
    virtual-host: /xxx
  cloud:
    stream:
      bindings:
        in:
          #若消息系統(tǒng)是RabbitMQ，目的地（destination）就是指exchange，消息系統(tǒng)是Kafka，那么就是指topic
          destination: test
          #在多實例的時候需要制定一個消息分組，不然每個實例都是匿名方式把隊列注冊到rabbitmq上去，導致一個交換機下有多個隊列
          #并且默認生成的交換機是topic類型的，會導致重復消費
          group: myIn
        out:
          destination: test

先上依賴

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.fchan</groupId>
    <artifactId>springcloudstream</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springcloudstream</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-stream-rabbit</artifactId>
<!--            <version>2.0.1.RELEASE</version>-->
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-stream-dependencies</artifactId>
                <version>Ditmars.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

再上yml配置

spring:
  rabbitmq:
    host: xxx.xxx.xxx.xx
    port: 35672
    username: xxx
    password: xxx
    virtual-host: /xxx
  cloud:
    stream:
      bindings:
        in:
          #若消息系統(tǒng)是RabbitMQ，目的地（destination）就是指exchange，消息系統(tǒng)是Kafka，那么就是指topic
          destination: test
          #在多實例的時候需要制定一個消息分組，不然每個實例都是匿名方式把隊列注冊到rabbitmq上去，導致一個交換機下有多個隊列
          #并且默認生成的交換機是topic類型的，會導致重復消費
          group: myIn
        out:
          destination: test

消息生產(chǎn)者

package com.fchan.springcloudstream.service;
import org.springframework.cloud.stream.annotation.Input;
import org.springframework.cloud.stream.annotation.Output;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.SubscribableChannel;
public interface MyMessageChannel {
    String out = "out";
    String in = "in";
    @Output(out)
    MessageChannel out();
    @Input(in)
    SubscribableChannel in();
}

發(fā)送消息

package com.fchan.springcloudstream.controller;
import com.fchan.springcloudstream.service.MyMessageChannel;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
import java.util.HashMap;
import java.util.Map;
@RestController
public class MessageController {
    @Resource
    private MyMessageChannel myMessageChannel;
    @RequestMapping("test")
    public String testMessage(){
        Map<String,Object> map = new HashMap<>();
        map.put("shopId", "123");
        myMessageChannel.out().send(MessageBuilder.withPayload(map).build());
        return "success";
    }
}

消息消費者

package com.fchan.springcloudstream.service;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.cloud.stream.annotation.EnableBinding;
import org.springframework.cloud.stream.annotation.StreamListener;
import org.springframework.messaging.Message;
import org.springframework.stereotype.Component;
import java.util.Map;
@Component
@EnableBinding({MyMessageChannel.class})
public class MyConsumer {
    Logger log = LoggerFactory.getLogger(MyConsumer.class);
    @StreamListener(MyMessageChannel.in)
    public void input(Message<Map<String,Object>> message){
        log.info("收到消息：{}", message.getPayload());
    }
}