springBoot整合RocketMQ及坑的示例代码
版本:
- jdk:1.8
- springboot:1.5.10
- rocketmq:4.2.0
pom 配置:
<parent> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-parent</artifactid> <version>1.5.10.release</version> </parent> <dependency> <groupid>org.apache.rocketmq</groupid> <artifactid>rocketmq-client</artifactid> <version>4.2.0</version> </dependency>
application.properties 配置:
# 消费者的组名 apache.rocketmq.consumer.pushconsumer=pushconsumer # 生产者的组名 apache.rocketmq.producer.producergroup=producer # nameserver地址 apache.rocketmq.namesrvaddr=localhost:9876
java代码:
生产者
package test.config.rocketmq; import org.apache.rocketmq.client.producer.defaultmqproducer; import org.apache.rocketmq.client.producer.sendresult; import org.apache.rocketmq.common.message.message; import org.apache.rocketmq.remoting.common.remotinghelper; import org.springframework.beans.factory.annotation.value; import org.springframework.stereotype.component; import org.springframework.util.stopwatch; import javax.annotation.postconstruct; @component public class rocketmqclient { /** * 生产者的组名 */ @value("${apache.rocketmq.producer.producergroup}") private string producergroup; /** * nameserver 地址 */ @value("${apache.rocketmq.namesrvaddr}") private string namesrvaddr; @postconstruct public void defaultmqproducer() { //生产者的组名 defaultmqproducer producer = new defaultmqproducer(producergroup); //指定nameserver地址,多个地址以 ; 隔开 producer.setnamesrvaddr(namesrvaddr); producer.setvipchannelenabled(false); try { /** * producer对象在使用之前必须要调用start初始化,初始化一次即可 * 注意:切记不可以在每次发送消息时,都调用start方法 */ producer.start(); //创建一个消息实例,包含 topic、tag 和 消息体 //如下:topic 为 "topictest",tag 为 "push" message message = new message("topictest", "push", "发送消息----zhisheng-----".getbytes(remotinghelper.default_charset)); stopwatch stop = new stopwatch(); stop.start(); for (int i = 0; i < 1; i++) { sendresult result = producer.send(message); system.out.println("发送响应:msgid:" + result.getmsgid() + ",发送状态:" + result.getsendstatus()); } stop.stop(); system.out.println("----------------发送一万条消息耗时:" + stop.gettotaltimemillis()); } catch (exception e) { e.printstacktrace(); } finally { producer.shutdown(); } } }
消费者:
import org.apache.rocketmq.client.consumer.defaultmqpushconsumer; import org.apache.rocketmq.client.consumer.listener.consumeconcurrentlystatus; import org.apache.rocketmq.client.consumer.listener.messagelistenerconcurrently; import org.apache.rocketmq.common.consumer.consumefromwhere; import org.apache.rocketmq.common.message.messageext; import org.apache.rocketmq.remoting.common.remotinghelper; import org.springframework.beans.factory.annotation.value; import org.springframework.stereotype.component; import javax.annotation.postconstruct; @component public class rocketmqserver { /** * 消费者的组名 */ @value("${apache.rocketmq.consumer.pushconsumer}") private string consumergroup; /** * nameserver 地址 */ @value("${apache.rocketmq.namesrvaddr}") private string namesrvaddr; @postconstruct public void defaultmqpushconsumer() { //消费者的组名 defaultmqpushconsumer consumer = new defaultmqpushconsumer(consumergroup); //指定nameserver地址,多个地址以 ; 隔开 consumer.setnamesrvaddr(namesrvaddr); consumer.setvipchannelenabled(false); try { //订阅pushtopic下tag为push的消息 consumer.subscribe("topictest", "push"); //设置consumer第一次启动是从队列头部开始消费还是队列尾部开始消费 //如果非第一次启动,那么按照上次消费的位置继续消费 consumer.setconsumefromwhere(consumefromwhere.consume_from_first_offset); consumer.registermessagelistener((messagelistenerconcurrently) (list, context) -> { try { for (messageext messageext : list) { system.out.println("messageext: " + messageext);//输出消息内容 string messagebody = new string(messageext.getbody(), remotinghelper.default_charset); system.out.println("消费响应:msgid : " + messageext.getmsgid() + ", msgbody : " + messagebody);//输出消息内容 } } catch (exception e) { e.printstacktrace(); return consumeconcurrentlystatus.reconsume_later; //稍后再试 } return consumeconcurrentlystatus.consume_success; //消费成功 }); consumer.start(); } catch (exception e) { e.printstacktrace(); } } }
掉坑总结:
1.rocketmq启动时,命令不是 mqbroker -n 127.0.0.1:9876
正确应该是:mqbroker -n 127.0.0.1:9876 butiautocreatetopicenable=true
否则会抛出:no route info of this topic, topictest
2.客户端连接时抛出异常
org.apache.rocketmq.client.exception.mqclientexception:
send [3] times, still failed, cost [3180]ms, topic: topictest, brokerssent: \
[win-93cgo0s5g25, win-93cgo0s5g25, win-93cgo0s5g25]
解决方式两种
1.producer.setvipchannelenabled(false); 生产者和消费者添加这行代买。
2.降rocketmq版本,降成3.2.6
关于spring.rocketmq.name-server的坑
看下图:
注意:
如果你是springboot2.0+的框架,或者是jdk10。
你需要将你自己的项目配置文件中的,spring.rocketmq.name-server改成
spring.rocketmq.nameserver。注意是nameserver。
不然就会报各种稀奇古怪的bug。
关于启动报内存不足的错
在安装启动name server和broker的时候,一定要修改配置文件,不然内存会爆炸。
native memory allocation (mmap) failed to map 8589934592 bytes for committing reserved memory
将下面的配置文件根据你的需要改
我这里以前默认是xms4g,都是g,我修改到m就行了。
java_opt="${java_opt} -server -xms256m -xmx256m -xmn128m -xx:metaspacesize=128m -xx:maxmetaspacesize=320m"
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。