kafaka发送接收消息stream方式实例

1.配置文件

input为接收，output为发送

如果发送接收在同一个程序中，则不需要加上consumer: headerMode:raw ，如果本程序仅是接收消息进行消费，需要加上consumer: headerMode:raw 

spring:  cloud:    stream:      bindings:        input-collect:          contentType: text/plain;charset=UTF-8          destination: ACCOUNT_COLLECT_NOTIFY          group: account-dev        input-order:          consumer:            headerMode: raw          contentType: text/plain;charset=UTF-8          destination: ACCOUNT_ORDER_NOTIFY          group: account-dev        output-collect:          contentType: text/plain;charset=UTF-8          destination: ACCOUNT_COLLECT_NOTIFY        output-watch:          contentType: text/plain;charset=UTF-8          destination: ACCOUNT_WATCH_NOTIFY      kafka:        binder:          brokers: 192.168.1.158:9092,192.168.1.159:9092,192.168.1.160:9092          zkNodes: 192.168.1.158:2181,192.168.1.159:2181,192.168.1.160:2181

2.发送消息outPut分类Bean

public interface NotifyMessageChannel {   String COLLECT_OUTPUT = "output-collect";   String WATCH_OUTPUT ="output-watch" ;      @Output(NotifyMessageChannel.COLLECT_OUTPUT)   MessageChannel collectOutPut();   @Output(NotifyMessageChannel.WATCH_OUTPUT)   MessageChannel watchOutPut();}

3.发送消息service

NotifyMessageChannel中定义了2个发送MessageChannel,发送时可以直接.collectOutPut().send，选择不同的output进行发送

@Service@Slf4j@EnableBinding(NotifyMessageChannel.class)public class NotifyServiceImpl implements NotifyService {    @Autowired    private NotifyMessageChannel notifyMessageChannel;    private ObjectMapper mapper = new ObjectMapper();    @Override    public void sendUserCollectCourse(UserCollectCourseNotify userCollectCourseNotify) {        try {            Boolean result = notifyMessageChannel.collectOutPut().send(MessageBuilder.withPayload(                    mapper.writeValueAsString(userCollectCourseNotify)).build()) ;            log.info("send result:"+result);        } catch (Exception e) {            log.error("Exception from create user UserCollectCourse.", e);        }    }}

4.接收消息input配置

public interface ReceiveMessageChannel {   String COLLECT_INPUT = "input-collect";   String ORDER_INPUT ="input-order" ;      @Input(ReceiveMessageChannel.COLLECT_INPUT)   SubscribableChannel collectInput();   @Input(ReceiveMessageChannel.ORDER_INPUT)   SubscribableChannel orderInput();}

5.监听接收到的消息，进行消费处理

@Service@Slf4j@EnableBinding(ReceiveMessageChannel.class)public class CollectListener {      private UserCollectCourseClient userCollectCourseService;      private ObjectMapper mapper = new ObjectMapper();   public CollectListener(UserCollectCourseClient userCollectCourseClient) {      this.userCollectCourseService = userCollectCourseClient;   }   @StreamListener(ReceiveMessageChannel.COLLECT_INPUT)   public void process(Message<String> message) {      log.debug("Received Notify:[{}]",message.toString());      String content = message.getPayload();      UserCollectCourseNotify uccn;      try {         uccn = mapper.readValue(content,UserCollectCourseNotify.class);         log.debug("Received Notify:[userId:{},courseId:{}]",uccn.getUserId(),uccn.getCourseId());         if(uccn!=null){            log.info("receive UserCollectCourseNotify:"+uccn);//          userCollectCourseService.saveUserCollectCourse(ucci);//          log.debug("Save Collect to Mongo:[userId:{},courseId:{}]",ucci.getUserId(),ucci.getCourseId());         }      } catch (Exception e) {         log.warn("RECEIVE Collect NOTIFY ERROR:[message_body:{},error:{}]",message.toString(),e.getLocalizedMessage());      }   }}