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本示例展示了一个RocketMQ producer的简单实现，通过解析文本文件获取输入数据，将数据经过Avro序列化后发送到RocketMQ。
程序通过stdin.xml配置文件获取主要参数值，stdin.xml文件内容如下：
rocketmq.nameserver.list 172.16.8.106:9876 rocketmq.group.id test006 rocketmq.topic TopicTest2 rocketmq.tags * rocketmq.message.key OrderID0034 schemaStr col1:string,col2:double filePath /home/test/rocketmq/input.txt
生产者示例程序如下：
import com.alibaba.rocketmq.client.exception.MQClientException;
import com.alibaba.rocketmq.client.producer.DefaultMQProducer;
import com.alibaba.rocketmq.client.producer.SendResult;
import com.alibaba.rocketmq.common.message.Message;
import com.scistor.datavision.operator.common.AvroUtils;
import com.scistor.datavision.operator.common.OperatorConfiguration;
import org.apache.avro.Schema;
import org.apache.hive.hcatalog.common.HCatException;
import org.apache.hive.hcatalog.data.schema.HCatSchema;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class RocketProducer {
// parameters
private String nameserver;
private String rocketmqTopic;
private String tags;
private String key;
private String schemaStr;
private String filePath;
public RocketProducer configure(OperatorConfiguration conf) {
this.nameserver = conf.get("rocketmq.nameserver.list");
this.rocketmqTopic = conf.get("rocketmq.topic");
this.tags = conf.get("rocketmq.tags");
this.key = conf.get("rocketmq.message.key");
this.schemaStr = conf.get("schemaStr");
this.filePath = conf.get("filePath");
return this;
}
public int run() {
DefaultMQProducer producer = new DefaultMQProducer("ProducerGroupName");
producer.setNamesrvAddr(nameserver);
producer.setInstanceName("RocketProducer");
/**
* 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
*/
try {
producer.start();
} catch (MQClientException e) {
e.printStackTrace();
}
HCatSchema hcatSchema = null;
Schema schema = null;
SchemaUtil schemaUtil = new SchemaUtil();
try {
hcatSchema = schemaUtil.createHCatSchema(schemaStr);
schema = schemaUtil.createSchema("com.scistor.rocketmq.producer", rocketmqTopic, hcatSchema);
} catch (HCatException e) {
e.printStackTrace();
}
List content = RocketProducer.readFileByLines(filePath);
/**
* 下面这段代码表明一个Producer对象可以发送多个topic，多个tag的消息。
* 注意：send方法是同步调用，只要不抛异常就标识成功。但是发送成功也可会有多种状态，
* 例如消息写入Master成功，但是Slave不成功，这种情况消息属于成功，但是对于个别应用如果对消息可靠性要求极高，
* 需要对这种情况做处理。另外，消息可能会存在发送失败的情况，失败重试由应用来处理。
*/
for (int i = 0; i < content.size(); i++) {
try {
{
String[] fields = content.get(i).split(",");
Object[] record = AvroUtils.convert(schema, fields);
byte[] bytes = AvroUtils.serialize(schema, record);
Message msg = new Message(rocketmqTopic,// topic
tags,// tag
key,// key
bytes);// body
SendResult sendResult = producer.send(msg);
System.out.println(sendResult);
}
} catch (Exception e) {
e.printStackTrace();
}
//TimeUnit.MILLISECONDS.sleep(10);
}
/**
* 应用退出时，要调用shutdown来清理资源，关闭网络连接，从MetaQ服务器上注销自己
* 注意：我们建议应用在JBOSS、Tomcat等容器的退出钩子里调用shutdown方法
*/
producer.shutdown();
return 0;
}
public static List readFileByLines(String fileName) {
List list = new ArrayList();
File file = new File(fileName);
BufferedReader reader = null;
try {
System.out.println("以行为单位读取文件内容，一次读一整行：");
reader = new BufferedReader(new FileReader(file));
String tempString = null;
int line = 1;
// 一次读入一行，直到读入null为文件结束
while ((tempString = reader.readLine()) != null) {
// 显示行号
list.add(tempString);
System.out.println("line " + line + ": " + tempString);
line++;
}
reader.close();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e1) {
}
}
}
return list;
}
public static void main(String[] args) {
if (args.length < 1) {
System.err.println("需要： 参数配置文件所在的hdfs目录");
System.exit(-1);
}
OperatorConfiguration conf = new OperatorConfiguration(args[0]);
RocketProducer trainer = new RocketProducer();
System.exit(trainer.configure(conf).run());
}
}
程序运行输出打印到控制台：
[root@m106 rocketmq]# ./produce.sh
以行为单位读取文件内容，一次读一整行： line 1: hdfs:///user/xdf/streaming/file-web/file/1.html,1 line 2: hdfs:///user/xdf/streaming/file-web/file/2.html,2 line 3: hdfs:///user/xdf/streaming/file-web/file/3.html,3 line 4: hdfs:///user/xdf/streaming/file-web/file/4.html,4 line 5: hdfs:///user/xdf/streaming/file-web/file,1 line 6: /home/xdf/workflow/file-web/file/1.html,1 line 7: /home/xdf/workflow/file-web/file/2.html,2 line 8: /home/xdf/workflow/file-web/file/3.html,3 line 9: /home/xdf/workflow/file-web/file/4.html,4 line 10: /home/xdf/workflow/file-web/file,1 SendResult [sendStatus=SEND_OK, msgId=AC10086A00002A9F000000001FB00A36, messageQueue=MessageQueue [topic=TopicTest2, brokerName=broker-a, queueId=0], queueOffset=18710] SendResult [sendStatus=SEND_OK, msgId=AC10086A00002A9F000000001FB00AED, messageQueue=MessageQueue [topic=TopicTest2, brokerName=broker-a, queueId=1], queueOffset=18700] SendResult [sendStatus=SEND_OK, msgId=AC10086A00002A9F000000001FB00BA4, messageQueue=MessageQueue [topic=TopicTest2, brokerName=broker-a, queueId=2], queueOffset=18668] SendResult [sendStatus=SEND_OK, msgId=AC10086A00002A9F000000001FB00C5B, messageQueue=MessageQueue [topic=TopicTest2, brokerName=broker-a, queueId=3], queueOffset=18663] SendResult [sendStatus=SEND_OK, msgId=AC10086B00002A9F000000001E197504, messageQueue=MessageQueue [topic=TopicTest2, brokerName=broker-b, queueId=0], queueOffset=18649] SendResult [sendStatus=SEND_OK, msgId=AC10086B00002A9F000000001E1975B4, messageQueue=MessageQueue [topic=TopicTest2, brokerName=broker-b, queueId=1], queueOffset=18633] SendResult [sendStatus=SEND_OK, msgId=AC10086B00002A9F000000001E197663, messageQueue=MessageQueue [topic=TopicTest2, brokerName=broker-b, queueId=2], queueOffset=18629] SendResult [sendStatus=SEND_OK, msgId=AC10086B00002A9F000000001E197712, messageQueue=MessageQueue [topic=TopicTest2, brokerName=broker-b, queueId=3], queueOffset=18626] SendResult [sendStatus=SEND_OK, msgId=AC10086A00002A9F000000001FB00D12, messageQueue=MessageQueue [topic=TopicTest2, brokerName=broker-a, queueId=0], queueOffset=18711] SendResult [sendStatus=SEND_OK, msgId=AC10086A00002A9F000000001FB00DC1, messageQueue=MessageQueue [topic=TopicTest2, brokerName=broker-a, queueId=1], queueOffset=18701]