版本:
- jdk:1.8
- springboot:1.5.10
- rocketmq:4.2.0
pom 配置:
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<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>
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application.properties 配置:
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# 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
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java代码:
生产者
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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();
}
}
}
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消费者:
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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();
}
}
}
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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服务器之家。
原文链接:https://blog.csdn.net/qq_24853627/article/details/79443437