kafka自定定义对象实现

1.异常

16:54:52.512 [main] INFO  kafka.utils.VerifiableProperties - Property serializer.class is overridden to com.bpbp.kafka.encoder.OrderEncoder

java.lang.ExceptionInInitializerError
	at com.bpbp.kafka.entity.OrderDataTest.test(OrderDataTest.java:32)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:117)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
Caused by: java.lang.NoSuchMethodException: com.bpbp.kafka.encoder.OrderEncoder.(kafka.utils.VerifiableProperties)
	at java.lang.Class.getConstructor0(Class.java:2892)
	at java.lang.Class.getConstructor(Class.java:1723)
	at kafka.utils.Utils$.createObject(Utils.scala:436)
	at kafka.producer.Producer.(Producer.scala:62)
	at kafka.javaapi.producer.Producer.(Producer.scala:26)
	at com.bpbp.kafka.Producer.init(Producer.java:44)
	at com.bpbp.kafka.Producer.(Producer.java:30)
	... 28 more

原因是缺少构造方法

com.bpbp.kafka.encoder.OrderEncoder

public class OrderEncoder implements kafka.serializer.Encoder {
    /**
     * 增加构造方法
     * @param verifiableProperties
     */
    public OrderEncoder(VerifiableProperties verifiableProperties){

    }
    /**
     * 对象转字节
     * @param orderData
     * @return
     */
    public byte[] toBytes(OrderData orderData) {
        return BeanUtil.object2Bytes(orderData);
    }

附上其他源码：

@Slf4j
public class Producer {

    //发送订单数据
    private static kafka.javaapi.producer.Producer orderProducer = null;
  
    static {
        init();
    }

    /**
     * 初始化Producer配置
     */
    private static void init() {
        Properties orderProp = new Properties();
        orderProp.put("metadata.broker.list", PropUtil.getKafkaBroker());
        orderProp.put("serializer.class", "com.bpbp.kafka.encoder.OrderEncoder");
        //key 的序列化类
        orderProp.put("key.serializer.class", "kafka.serializer.StringEncoder");
        orderProp.put("request.required.acks", "-1");
        //实例化订单发送者
        orderProducer = new kafka.javaapi.producer.Producer(new ProducerConfig(
           orderProp));
    }

    /**
     * 发送订单数据
     * @param key
     * @param data
     */
    public static void sendOrderData(String key, OrderData data) {
        log.info("Send order data, orderid:", data.getBpbpOrderNo());
        try {
            orderProducer.send(new KeyedMessage(PropUtil.getOrderTopic(), key,
                data));
        } catch (Exception e) {
            log.error("Send order data [{}] exception:",data.getBpbpOrderNo(), e.getMessage());
        }
    }

数据对象类定义

@Data
@ToString  //必须
public class OrderData implements java.io.Serializable {
    
    private String bpbpOrderNo;

    /**
     * 渠道号
     */
    private String channelCode;

       /**
     * 时间戳-每次调用生成
     */
    private long   timeStamp;

}

消费者

public class Consumer {
    private static ConsumerConnector orderConsumer;

     static {
        init();
    }

    private static void init(){
        Properties prop = new Properties();
        prop.put("zookeeper.connect", PropUtil.getZkUrl());
        prop.put("group.id","order");
        prop.put("zookeeper.session.timeout.ms","400");
        prop.put("zookeeper.sync.time.ms","200");
        prop.put("auto.commit.interval.ms","1000");

        orderConsumer = kafka.consumer.Consumer.createJavaConsumerConnector(new ConsumerConfig(prop));
    }

    public static void receive(){
        Map topicCountMap = new HashMap();
        topicCountMap.put(PropUtil.getOrderTopic(),new Integer(1));
        Map>> consumerMap = orderConsumer.createMessageStreams(topicCountMap);
        KafkaStream stream = consumerMap.get(PropUtil.getOrderTopic()).get(0);

        ConsumerIterator it = stream.iterator();
        while(it.hasNext()){
            byte[] bytes = it.next().message();
            OrderData orderData = (OrderData) BeanUtil.bytes2Object(bytes);
            System.out.println(orderData.getBpbpOrderNo());
        }
    }
}