ONS发布订阅消息
ONS， 全名Open Notification Service, 是阿里基于开源消息中间件RocketMQ的一个云产品。
首先，要申请阿里账号等。本地也可以申请阿里云账号自己调试。此处为公司拥有阿里云服务，与运维op申请ons测试可用的服务。
申请ONS需要的创建topic，PID，CID，access_key，secret_key，要给产生access_key的账户授权发布订阅功能权限，具体请看其他配置阿里云账户权限的文章。
提供了这些以后，可以在官网查看ons快速入门文档创建简单的demo测试类调试生产和消费
使用ONS API发送订阅消息的示例
首先，pom引用ons-client
<!-- RocketMq ons-client-->
<dependency>
<groupId>com.aliyun.openservices</groupId>
<artifactId>ons-client</artifactId>
<version>1.7.0.Final</version>
</dependency>
第二步，配置消费者：
- 创建一个常量类存放
/**
* 公共参数配置
*
*/
public interface MqConfigParams {
//测试ons配置文件
public static final String TOPIC = "你申请下来的topic";
public static final String TAG = "*";
public static final String PRODUCER_ID = "你申请下来的pid";
public static final String CONSUMER_ID = "你申请下来的cid";
public static final String ACCESS_KEY = "你申请下来的accesskey";
public static final String SECRET_KEY = "你申请下来的secretkey";
public static final String ONS_ADDR = "http://onsaddr-internet.aliyun.com/rocketmq/nsaddr4client-internet";
}
- 创建一个生产者类，此处填入配置文件中的常量类，然后调用getproduce方法时启动生产者 producer.start();
import com.aliyun.openservices.ons.api.*;
import java.util.Date;
import java.util.Properties;
public class ONSUtil {
/**
* 获取消息的 Producer
*
* @return Producer
*/
public static Producer getProducer() {
Properties properties = new Properties();
properties.put(PropertyKeyConst.ProducerId, MqConfigParams.PRODUCER_ID);
properties.put(PropertyKeyConst.AccessKey, MqConfigParams.ACCESS_KEY);
properties.put(PropertyKeyConst.SecretKey, MqConfigParams.SECRET_KEY);
Producer producer = ONSFactory.createProducer(properties);
// 在发送消息前，必须调用start方法来启动Producer，只需调用一次即可。
producer.start();
return producer;
}
}
- 封装一个发送消息的方法。
import com.aliyun.openservices.ons.api.Message;
import com.aliyun.openservices.ons.api.Producer;
import com.aliyun.openservices.ons.api.SendResult;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
@Service
public class OnsProducer {
private final static Logger logger = LoggerFactory.getLogger(SeoLogController.class);
public void sendMessage(String topic, String tag, String msgStr) {
StringBuilder logsb = new StringBuilder("send OnsMQ Msg:");
Message msg = getInstance(topic, tag, msgStr);
String messageId = "";
Producer producer = ONSUtil.getProducer(); //你申请的producerId
SendResult sendResult = producer.send(msg);
messageId = sendResult.getMessageId();
if (messageId != null && !messageId.equals("")) {
logsb.append("[OnsProducer] : " + "{ messageId : " + messageId + " , msgStr :" + msgStr + "}");
} else {
logsb.append("[OnsProducer] fail: " + "{ " + " msgStr :" + msgStr + "}");
}
logger.debug(logsb.toString());
}
private static Message getInstance(String topic, String tag, String body) {
if (body.equals("") || body == null)
body = "";
Message msg = new Message(topic, tag, body.getBytes());
return msg;
}
}
这样就配置好了生产者。
调用生产者
可以写一个test类用main方法调试，示例这里是直接写main方法执行上面封装的内容直接执行看查看日志看是否成功
import com.aliyun.openservices.ons.api.Message;
import com.aliyun.openservices.ons.api.Producer;
import com.aliyun.openservices.ons.api.SendResult;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class TestSendMessage {
private final static Logger logger = LoggerFactory.getLogger(TestSendMessage.class);
public static void main(String[] args) {
StringBuilder logsb = new StringBuilder("send OnsMQ Msg:");
Producer producer = ONSUtil.getProducer(); //你申请的producerId
Message msg = new Message(MqConfigParams.TOPIC, //你申请的TopicName
"*","这是消息2".getBytes());
SendResult sendResult = producer.send(msg);
String messageId = "";
messageId = sendResult.getMessageId();
if (messageId != null || !messageId.equals("")) {
logsb.append("[OnsProducer] : " + "{ messageId : " + messageId + " , msgStr :" + "这是消息2" + "}");
} else {
logsb.append("[OnsProducer] fail: " + "{ " + " msgStr :" + "这是消息2" + "}");
}
logger.debug(logsb.toString());
}
}
@RequestMapping(value = "/testmqProducer", method = RequestMethod.GET)
public void testmq() {
OnsProducer onsProducer=new OnsProducer();
String msg = "testmq";
onsProducer.sendMessage(MqConfigParams.TOPIC,"*",msg);
}
接下来写消费者示例：
- 创建监听类实现MessageListener此处是处理业务逻辑因为此处可以得到消费的内容
import com.aliyun.openservices.ons.api.Action;
import com.aliyun.openservices.ons.api.ConsumeContext;
import com.aliyun.openservices.ons.api.Message;
import com.aliyun.openservices.ons.api.MessageListener;
import java.util.Date;
public class MyMessageListener implements MessageListener {
@Override
public Action consume(Message message, ConsumeContext consumeContext) {
System.out.println("Receive @" + new Date() + ": " + message);
//此处可以写具体业务逻辑，body是具体发送的内容
String body = new String(message.getBody());
System.out.println("msgBody is : " + body);
return Action.CommitMessage;
}
}
- 创建消费者启动类和方法
import com.aliyun.openservices.ons.api.Consumer;
import com.aliyun.openservices.ons.api.ONSFactory;
import com.aliyun.openservices.ons.api.PropertyKeyConst;
import java.util.Date;
import java.util.Properties;
public class MyMessageConsumer {
/**
* 订阅消息
*/
public void subscribe() {
Properties properties = new Properties();
properties.put(PropertyKeyConst.ConsumerId, MqConfigParams.CONSUMER_ID);
properties.put(PropertyKeyConst.AccessKey, MqConfigParams.ACCESS_KEY);
properties.put(PropertyKeyConst.SecretKey, MqConfigParams.SECRET_KEY);
Consumer consumer = ONSFactory.createConsumer(properties);
consumer.subscribe(MqConfigParams.TOPIC, "*", new MyMessageListener());//此处可以写父类messageListener但是必须实现方法这里就是用到了上面写的myMessageListener
consumer.start();
System.out.println(MqConfigParams.CONSUMER_ID + " is running @" + new Date());
}
}
- 在Application启动类中加入消费者启动调用方法
@SpringBootApplication
@MapperScan("com.ons.test")
public class Application {
public static void main(String[] args) {
// 启动嵌入式的 Tomcat 并初始化 Spring 环境及其各 Spring 组件
SpringApplication.run(Application.class,args);
new MyMessageConsumer().subscribe(); // 系统启动的时候启动订阅
}}
