21 springboot集成kafka

1. 配置文件

spring.kafka.bootstrap-servers=CentOSA:9092,CentOSB:9092,CentOSC:9092

spring.kafka.producer.retries=5
spring.kafka.producer.acks=all
spring.kafka.producer.batch-size=16384
spring.kafka.producer.buffer-memory=33554432
spring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.StringSerializer
spring.kafka.producer.value-serializer=org.apache.kafka.common.serialization.StringSerializer
spring.kafka.producer.properties.enable.idempotence=true
spring.kafka.producer.transaction-id-prefix=transaction-id-


spring.kafka.consumer.group-id=group1
spring.kafka.consumer.auto-offset-reset=earliest
spring.kafka.consumer.enable-auto-commit=true
spring.kafka.consumer.auto-commit-interval=100
spring.kafka.consumer.properties.isolation.level=read_committed
spring.kafka.consumer.key-deserializer=org.apache.kafka.common.serialization.StringDeserializer
spring.kafka.consumer.value-deserializer=org.apache.kafka.common.serialization.StringDeserializer

spring.kafka.streams.application-id=wordcount_id
spring.kafka.streams.client-id=app1
spring.kafka.streams.auto-startup=true
spring.kafka.streams.state-dir=/Users/admin/Desktop/checkpoint
spring.kafka.streams.replication-factor=1
spring.kafka.streams.properties.processing.guarantee=exactly_once
        

2. logback.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%p %d{yyyy-MM-dd HH:mm:ss} - %m%n</pattern>
            <charset>UTF-8</charset>
        </encoder>
    </appender>

    <!-- 控制台输出日志级别 -->
    <root level="ERROR">
        <appender-ref ref="STDOUT" />
    </root>

    <logger name="org.springframework.kafka" level="INFO"  additivity="false">
        <appender-ref ref="STDOUT" />
    </logger>
    <logger name="org.springframework.kafka.transaction" level="debug"  additivity="false">
         <appender-ref ref="STDOUT" />
    </logger>
</configuration>

3. application

package com.baizhi;

import org.apache.kafka.clients.consumer.ConsumerRecord;

import org.apache.kafka.common.serialization.Serdes;
import org.apache.kafka.common.utils.Bytes;
import org.apache.kafka.streams.StreamsBuilder;
import org.apache.kafka.streams.kstream.*;
import org.apache.kafka.streams.state.KeyValueStore;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.kafka.annotation.EnableKafka;
import org.springframework.kafka.annotation.EnableKafkaStreams;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.kafka.annotation.KafkaListeners;
import org.springframework.messaging.handler.annotation.SendTo;

import java.io.IOException;
import java.util.Arrays;
import java.util.stream.Collectors;



@SpringBootApplication
@EnableKafkaStreams
@EnableKafka
public class KafkaSpringBootApplication {
    public static void main(String[] args) throws IOException {
        SpringApplication.run(KafkaSpringBootApplication.class,args);
        System.in.read();
    }



    @KafkaListeners(value = {@KafkaListener(topics = {"topic04"})})
    @SendTo(value = {"topic05"})
    public String listenner(ConsumerRecord<?, ?> cr) {

        return cr.value()+" mashibing edu";
    }

    @Bean
    public KStream<String, String> kStream(StreamsBuilder kStreamBuilder) {

        KStream<String, String> stream = kStreamBuilder.stream(
                "topic02",
                Consumed.with(Serdes.String(),
                Serdes.String()));

        stream.flatMapValues(new ValueMapper<String, Iterable<String>>() {
            @Override
            public Iterable<String> apply(String s) {
                return Arrays.stream(s.split(" ")).collect(Collectors.toList());
            }
        })
        .selectKey((k,v)->v)
        .groupByKey(Serialized.with(Serdes.String(),Serdes.String()))
        .count(Materialized.<String,Long, KeyValueStore<Bytes, byte[]>>as("wordcount"))
        .toStream()
        .print(Printed.toSysOut());

        return stream;
    }

}

package com.baizhi.service;

public interface IOrderService {
    public void saveOrder(String id,Object message);
}

package com.baizhi.service.impl;

import com.baizhi.service.IOrderService;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Transactional
@Service
public class OrderService implements IOrderService {

    @Autowired
    private KafkaTemplate kafkaTemplate;

    @Override
    public void saveOrder(String id,Object message) {
        kafkaTemplate.send(new ProducerRecord("topic04",id,message));
    }
}

package com.baizhi.tests;

import com.baizhi.KafkaSpringBootApplication;
import com.baizhi.service.IOrderService;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.kafka.core.KafkaOperations;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import java.util.Date;
import java.util.zip.DataFormatException;

@SpringBootTest(classes = {KafkaSpringBootApplication.class})
@RunWith(SpringRunner.class)
public class KafkaTempolateTests {
    @Autowired
    private KafkaTemplate kafkaTemplate;
    @Autowired
    private IOrderService orderService;

    @Test
    public void testOrderService(){
        orderService.saveOrder("001","baizhi edu ");
    }
    @Test
    public void testKafkaTemplate(){
        kafkaTemplate.executeInTransaction(new KafkaOperations.OperationsCallback() {
            @Override
            public Object doInOperations(KafkaOperations kafkaOperations) {
                return kafkaOperations.send(new ProducerRecord("topic01","002","this is a demo"));
            }
        });
    }

}