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.OrderEncoderjava.lang.ExceptionInInitializerErrorat 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$2.evaluate(ParentRunner.java:268)at org.junit.runners.ParentRunner.run(ParentRunner.java:363)at org.junit.runner.JUnitCore.run(JUnitCore.java:137)at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:117)at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:606)at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)Caused by: java.lang.NoSuchMethodException: com.bpbp.kafka.encoder.OrderEncoder.<init>(kafka.utils.VerifiableProperties)at java.lang.Class.getConstructor0(Class.java:2892)at java.lang.Class.getConstructor(Class.java:1723)at kafka.utils.Utils$.createObject(Utils.scala:436)at kafka.producer.Producer.<init>(Producer.scala:62)at kafka.javaapi.producer.Producer.<init>(Producer.scala:26)at com.bpbp.kafka.Producer.init(Producer.java:44)at com.bpbp.kafka.Producer.<clinit>(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<OrderData> {    /**     * 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：

@Slf4jpublic class Producer {    //发送订单数据    private static kafka.javaapi.producer.Producer<String, OrderData> 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<String, OrderData>(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<String, OrderData>(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<String,Integer> topicCountMap = new HashMap<String, Integer>();        topicCountMap.put(PropUtil.getOrderTopic(),new Integer(1));        Map<String,List<KafkaStream<byte[],byte[]>>> consumerMap = orderConsumer.createMessageStreams(topicCountMap);        KafkaStream<byte[],byte[]> stream = consumerMap.get(PropUtil.getOrderTopic()).get(0);        ConsumerIterator<byte[],byte[]> it = stream.iterator();        while(it.hasNext()){            byte[] bytes = it.next().message();            OrderData orderData = (OrderData) BeanUtil.bytes2Object(bytes);            System.out.println(orderData.getBpbpOrderNo());        }    }}