Springboot 集成 Kafka
Kafka 安装与配置
安装
Kafka 安装指南
配置
Kafka 配置笔记
ZK & Kafka 配置与启动
ZK 配置
ZK 使用 Kafka 自带的 ZK，使用默认的配置文件
ZK 启动
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| 1# 前台启动命令
2bin/zookeeper-server-start.sh config/zookeeper.properties
3# 后台启动命令
4nohup bin/zookeeper-server-start.sh config/zookeeper.properties
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Kafka 配置
kafka 修改的配置如下
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| 1############################## Server Basics #############################
2# The id of the broker. This must be set to a unique integer for each broker.
3broker.id=0
4############################# Socket Server Settings #############################
5# The address the socket server listens on. It will get the value returned from
6# java.net.InetAddress.getCanonicalHostName() if not configured.
7# FORMAT:
8# listeners = listener_name://host_name:port
9# EXAMPLE:
10# listeners = PLAINTEXT://your.host.name:9092
11#listeners=PLAINTEXT://:9092
12### 修改处，listeners表示非kafka集群内的机器访问kafka
13listeners=PLAINTEXT://192.168.239.147:9092
14# Hostname and port the broker will advertise to producers and consumers. If not set,
15# it uses the value for "listeners" if configured. Otherwise, it will use the value
16# returned from java.net.InetAddress.getCanonicalHostName().
17#advertised.listeners=PLAINTEXT://your.host.name:9092
18### 修改处，节点的主机名会通知给生产者和消费者
19advertised.listeners=PLAINTEXT://192.168.239.147:9092
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kafka 启动命令
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| 1# 前台启动命令
2bin/kafka-server-start.sh config/server.properties
3# 后台启动命令
4bin/kafka-server-start.sh -daemon config/server.properties
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Springboot 项目配置
生产者
pom.xml
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| 1<?xml version="1.0" encoding="UTF-8"?>
2<project xmlns="http://maven.apache.org/POM/4.0.0"
3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
5 <modelVersion>4.0.0</modelVersion>
6
7 <groupId>top.simba1949</groupId>
8 <artifactId>kafka-02-producer</artifactId>
9 <version>1.0-SNAPSHOT</version>
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11 <dependencyManagement>
12 <dependencies>
13 <dependency>
14 <groupId>io.spring.platform</groupId>
15 <artifactId>platform-bom</artifactId>
16 <version>Cairo-RELEASE</version>
17 <type>pom</type>
18 <scope>import</scope>
19 </dependency>
20 </dependencies>
21 </dependencyManagement>
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23 <dependencies>
24 <dependency>
25 <groupId>org.springframework.boot</groupId>
26 <artifactId>spring-boot-starter</artifactId>
27 </dependency>
28 <dependency>
29 <groupId>org.springframework.boot</groupId>
30 <artifactId>spring-boot-starter-web</artifactId>
31 </dependency>
32 <dependency>
33 <groupId>org.springframework.boot</groupId>
34 <artifactId>spring-boot-starter-test</artifactId>
35 <scope>test</scope>
36 </dependency>
37 <dependency>
38 <groupId>org.springframework.boot</groupId>
39 <artifactId>spring-boot-devtools</artifactId>
40 <optional>true</optional> <!-- 表示依赖不会传递 -->
41 </dependency>
42 <dependency>
43 <groupId>org.projectlombok</groupId>
44 <artifactId>lombok</artifactId>
45 <version>1.18.4</version>
46 <scope>provided</scope>
47 </dependency>
48 <dependency>
49 <groupId>org.springframework.boot</groupId>
50 <artifactId>spring-boot-starter-actuator</artifactId>
51 </dependency>
52 <dependency>
53 <groupId>com.alibaba</groupId>
54 <artifactId>fastjson</artifactId>
55 <version>1.2.51</version>
56 </dependency>
57 <dependency>
58 <groupId>org.springframework.kafka</groupId>
59 <artifactId>spring-kafka</artifactId>
60 </dependency>
61 </dependencies>
62 <build>
63 <plugins>
64 <!--编译插件-->
65 <plugin>
66 <groupId>org.apache.maven.plugins</groupId>
67 <artifactId>maven-compiler-plugin</artifactId>
68 <configuration>
69 <!-- 配置使用的 jdk 版本 -->
70 <target>1.8</target>
71 <source>1.8</source>
72 </configuration>
73 </plugin>
74 <!--springboot-maven打包插件-->
75 <plugin>
76 <groupId>org.springframework.boot</groupId>
77 <artifactId>spring-boot-maven-plugin</artifactId>
78 </plugin>
79 <!--资源拷贝插件-->
80 <plugin>
81 <groupId>org.apache.maven.plugins</groupId>
82 <artifactId>maven-resources-plugin</artifactId>
83 <configuration>
84 <encoding>UTF-8</encoding>
85 </configuration>
86 </plugin>
87 <!--实现热部署插件-->
88 <plugin>
89 <groupId>org.springframework.boot</groupId>
90 <artifactId>spring-boot-maven-plugin</artifactId>
91 <configuration>
92 <fork>true</fork> <!-- 如果没有该配置，devtools不会生效 -->
93 </configuration>
94 </plugin>
95 </plugins>
96 <!--IDEA是不会编译src的java目录的xml文件，如果需要读取，则需要手动指定哪些配置文件需要读取-->
97 <resources>
98 <resource>
99 <directory>src/main/java</directory>
100 <includes>
101 <include>**/*</include>
102 </includes>
103 </resource>
104 <resource>
105 <directory>src/main/resources</directory>
106 <includes>
107 <include>**/*</include>
108 </includes>
109 </resource>
110 </resources>
111 </build>
112</project>
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配置文件
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| 1server:
2 port: 8091
3spring:
4 kafka:
5 bootstrap-servers: 192.168.239.147:9092
6 producer:
7 batchSize: 1
8 bufferMemory: 102400
9 key-serializer: org.apache.kafka.common.serialization.StringSerializer
10 value-serializer: org.apache.kafka.common.serialization.StringSerializer
11 retries: 3
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启动类
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| 1package top.simba1949;
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3import org.springframework.boot.SpringApplication;
4import org.springframework.boot.autoconfigure.SpringBootApplication;
5
6/**
7 * @author SIMBA1949
8 * @date 2019/1/18 22:16
9 */
10@SpringBootApplication
11public class Application {
12 public static void main(String[] args) {
13 SpringApplication.run(Application.class, args);
14 }
15}
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DTO
BaseDto.java
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| 1package top.simba1949.common;
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3import java.io.Serializable;
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5/**
6 * @author SIMBA1949
7 * @date 2019/1/19 8:29
8 */
9public class BaseDto implements Serializable {
10 private static final long serialVersionUID = -2422619315901989324L;
11}
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MessageDto.java
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| 1package top.simba1949.common;
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3import lombok.Data;
4import java.util.Date;
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6/**
7 * @author SIMBA1949
8 * @date 2019/1/19 8:00
9 */
10@Data
11public class MessageDto<T> {
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13 private static final long serialVersionUID = -8235914195331898424L;
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15 private Long id;
16 private T body;
17 private Date sendTime;
18}
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UserDto.java
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| 1package top.simba1949.common;
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3import lombok.Data;
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5/**
6 * @author SIMBA1949
7 * @date 2019/1/19 8:03
8 */
9@Data
10public class UserDto {
11 private static final long serialVersionUID = -7780254430276793521L;
12
13 private Long id;
14 private String username;
15 private String password;
16}
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KafkaProducerController.java
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| 1package top.simba1949.controller;
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3import com.alibaba.fastjson.JSON;
4import org.slf4j.Logger;
5import org.slf4j.LoggerFactory;
6import org.springframework.beans.factory.annotation.Autowired;
7import org.springframework.kafka.core.KafkaTemplate;
8import org.springframework.util.concurrent.ListenableFuture;
9import org.springframework.web.bind.annotation.*;
10import top.simba1949.common.MessageDto;
11import top.simba1949.common.UserDto;
12
13/**
14 * @author SIMBA1949
15 * @date 2019/1/18 22:17
16 */
17@RestController
18@RequestMapping
19public class KafkaProducerController {
20 private Logger logger = LoggerFactory.getLogger(KafkaProducerController.class);
21 @Autowired
22 private KafkaTemplate kafkaTemplate;
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24 @GetMapping("{name}/send")
25 public String send(@PathVariable("name")String name, String msg){
26 logger.info("get value: name is " + name + " & msg is " + msg);
27
28 ListenableFuture listenableFuture = kafkaTemplate.send("topic04", msg);
29 listenableFuture.addCallback(result -> {
30 logger.info("success" + result.toString());
31 }, ex -> {
32 logger.info("failure" + ex.toString());
33 });
34
35 return "DONE";
36 }
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38 @PostMapping("dto")
39 public String sendDto(@RequestBody MessageDto<UserDto> msg){
40 logger.info("the POJO's value is " + msg.toString());
41 String msgStr = JSON.toJSONString(msg);
42 ListenableFuture listenableFuture = kafkaTemplate.send("topic05", msgStr);
43 listenableFuture.addCallback(result -> {
44 logger.info("success" + result.toString());
45 }, ex -> {
46 logger.info("failure" + ex.toString());
47 });
48 return "DONE";
49 }
50}
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消费者
pom.xml
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| 1<?xml version="1.0" encoding="UTF-8"?>
2<project xmlns="http://maven.apache.org/POM/4.0.0"
3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
5 <parent>
6 <artifactId>Springboot-Kafka</artifactId>
7 <groupId>top.simba1949</groupId>
8 <version>1.0-SNAPSHOT</version>
9 </parent>
10 <modelVersion>4.0.0</modelVersion>
11
12 <artifactId>kafka-02-consumer</artifactId>
13
14 <dependencyManagement>
15 <dependencies>
16 <dependency>
17 <groupId>io.spring.platform</groupId>
18 <artifactId>platform-bom</artifactId>
19 <version>Cairo-RELEASE</version>
20 <type>pom</type>
21 <scope>import</scope>
22 </dependency>
23 </dependencies>
24 </dependencyManagement>
25
26 <dependencies>
27 <dependency>
28 <groupId>org.springframework.boot</groupId>
29 <artifactId>spring-boot-starter</artifactId>
30 </dependency>
31 <dependency>
32 <groupId>org.springframework.boot</groupId>
33 <artifactId>spring-boot-starter-web</artifactId>
34 </dependency>
35 <dependency>
36 <groupId>org.springframework.boot</groupId>
37 <artifactId>spring-boot-starter-test</artifactId>
38 <scope>test</scope>
39 </dependency>
40 <dependency>
41 <groupId>org.springframework.boot</groupId>
42 <artifactId>spring-boot-devtools</artifactId>
43 <optional>true</optional> <!-- 表示依赖不会传递 -->
44 </dependency>
45 <dependency>
46 <groupId>org.projectlombok</groupId>
47 <artifactId>lombok</artifactId>
48 <version>1.18.4</version>
49 <scope>provided</scope>
50 </dependency>
51 <dependency>
52 <groupId>org.springframework.boot</groupId>
53 <artifactId>spring-boot-starter-actuator</artifactId>
54 </dependency>
55 <dependency>
56 <groupId>com.alibaba</groupId>
57 <artifactId>fastjson</artifactId>
58 <version>1.2.51</version>
59 </dependency>
60 <dependency>
61 <groupId>org.springframework.kafka</groupId>
62 <artifactId>spring-kafka</artifactId>
63 </dependency>
64 </dependencies>
65 <build>
66 <plugins>
67 <!--编译插件-->
68 <plugin>
69 <groupId>org.apache.maven.plugins</groupId>
70 <artifactId>maven-compiler-plugin</artifactId>
71 <configuration>
72 <!-- 配置使用的 jdk 版本 -->
73 <target>1.8</target>
74 <source>1.8</source>
75 </configuration>
76 </plugin>
77 <!--springboot-maven打包插件-->
78 <plugin>
79 <groupId>org.springframework.boot</groupId>
80 <artifactId>spring-boot-maven-plugin</artifactId>
81 </plugin>
82 <!--资源拷贝插件-->
83 <plugin>
84 <groupId>org.apache.maven.plugins</groupId>
85 <artifactId>maven-resources-plugin</artifactId>
86 <configuration>
87 <encoding>UTF-8</encoding>
88 </configuration>
89 </plugin>
90 <!--实现热部署插件-->
91 <plugin>
92 <groupId>org.springframework.boot</groupId>
93 <artifactId>spring-boot-maven-plugin</artifactId>
94 <configuration>
95 <fork>true</fork> <!-- 如果没有该配置，devtools不会生效 -->
96 </configuration>
97 </plugin>
98 </plugins>
99 <!--IDEA是不会编译src的java目录的xml文件，如果需要读取，则需要手动指定哪些配置文件需要读取-->
100 <resources>
101 <resource>
102 <directory>src/main/java</directory>
103 <includes>
104 <include>**/*</include>
105 </includes>
106 </resource>
107 <resource>
108 <directory>src/main/resources</directory>
109 <includes>
110 <include>**/*</include>
111 </includes>
112 </resource>
113 </resources>
114 </build>
115</project>
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配置文件
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| 1server:
2 port: 8081
3spring:
4 kafka:
5 bootstrap-servers: 192.168.239.147:9092
6 consumer:
7 groupId: group01
8 key-serializer: org.apache.kafka.common.serialization.StringSerializer
9 value-serializer: org.apache.kafka.common.serialization.StringSerializer
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启动类
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| 1package top.simba1949;
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3import org.springframework.boot.SpringApplication;
4import org.springframework.boot.autoconfigure.SpringBootApplication;
5
6/**
7 * @author SIMBA1949
8 * @date 2019/1/18 22:28
9 */
10@SpringBootApplication
11public class Application {
12 public static void main(String[] args) {
13 SpringApplication.run(Application.class, args);
14 }
15}
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DTO 类
和生成者DTO类一致，尤其注意系列化 ID
监听类
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| 1package top.simba1949.service;
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3import com.alibaba.fastjson.JSON;
4import org.apache.kafka.clients.consumer.ConsumerRecord;
5import org.slf4j.Logger;
6import org.slf4j.LoggerFactory;
7import org.springframework.kafka.annotation.KafkaListener;
8import org.springframework.stereotype.Service;
9import top.simba1949.common.MessageDto;
10
11import java.util.Optional;
12
13/**
14 * @author SIMBA1949
15 * @date 2019/1/18 22:29
16 */
17@Service
18public class KafkaConsumerServiceImpl {
19 private Logger logger = LoggerFactory.getLogger(KafkaConsumerServiceImpl.class);
20
21 @KafkaListener(topics = {"topic04"})
22 public void print(ConsumerRecord record){
23 Optional<Object> kafkaMessage = Optional.ofNullable(record.value());
24 if (kafkaMessage.isPresent()){
25 Object msg = kafkaMessage.get();
26 logger.info("record " + record);
27 logger.info("msg " + msg);
28 }
29 }
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31 @KafkaListener(topics = {"topic05"})
32 public void getDto(ConsumerRecord record){
33 Optional<Object> kafkaMessage = Optional.ofNullable(record.value());
34 if (kafkaMessage.isPresent()){
35 String msgStr = (String) kafkaMessage.get();
36 MessageDto realMsg = JSON.parseObject(msgStr, MessageDto.class);
37 logger.info("record " + record);
38 logger.info("msg " + realMsg.toString());
39 }
40 }
41}
42
43 |
测试如下
生产者
消费者
附录
Kafka 原配置文件
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| 1# Licensed to the Apache Software Foundation (ASF) under one or more
2# contributor license agreements. See the NOTICE file distributed with
3# this work for additional information regarding copyright ownership.
4# The ASF licenses this file to You under the Apache License, Version 2.0
5# (the "License"); you may not use this file except in compliance with
6# the License. You may obtain a copy of the License at
7#
8# http://www.apache.org/licenses/LICENSE-2.0
9#
10# Unless required by applicable law or agreed to in writing, software
11# distributed under the License is distributed on an "AS IS" BASIS,
12# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13# See the License for the specific language governing permissions and
14# limitations under the License.
15
16# see kafka.server.KafkaConfig for additional details and defaults
17
18############################# Server Basics #############################
19
20# The id of the broker. This must be set to a unique integer for each broker.
21broker.id=0
22
23############################# Socket Server Settings #############################
24
25# The address the socket server listens on. It will get the value returned from
26# java.net.InetAddress.getCanonicalHostName() if not configured.
27# FORMAT:
28# listeners = listener_name://host_name:port
29# EXAMPLE:
30# listeners = PLAINTEXT://your.host.name:9092
31#listeners=PLAINTEXT://:9092
32
33# Hostname and port the broker will advertise to producers and consumers. If not set,
34# it uses the value for "listeners" if configured. Otherwise, it will use the value
35# returned from java.net.InetAddress.getCanonicalHostName().
36#advertised.listeners=PLAINTEXT://your.host.name:9092
37
38# Maps listener names to security protocols, the default is for them to be the same. See the config documentation for more details
39#listener.security.protocol.map=PLAINTEXT:PLAINTEXT,SSL:SSL,SASL_PLAINTEXT:SASL_PLAINTEXT,SASL_SSL:SASL_SSL
40
41# The number of threads that the server uses for receiving requests from the network and sending responses to the network
42num.network.threads=3
43
44# The number of threads that the server uses for processing requests, which may include disk I/O
45num.io.threads=8
46
47# The send buffer (SO_SNDBUF) used by the socket server
48socket.send.buffer.bytes=102400
49
50# The receive buffer (SO_RCVBUF) used by the socket server
51socket.receive.buffer.bytes=102400
52
53# The maximum size of a request that the socket server will accept (protection against OOM)
54socket.request.max.bytes=104857600
55
56
57############################# Log Basics #############################
58
59# A comma separated list of directories under which to store log files
60log.dirs=/tmp/kafka-logs
61
62# The default number of log partitions per topic. More partitions allow greater
63# parallelism for consumption, but this will also result in more files across
64# the brokers.
65num.partitions=1
66
67# The number of threads per data directory to be used for log recovery at startup and flushing at shutdown.
68# This value is recommended to be increased for installations with data dirs located in RAID array.
69num.recovery.threads.per.data.dir=1
70
71############################# Internal Topic Settings #############################
72# The replication factor for the group metadata internal topics "__consumer_offsets" and "__transaction_state"
73# For anything other than development testing, a value greater than 1 is recommended for to ensure availability such as 3.
74offsets.topic.replication.factor=1
75transaction.state.log.replication.factor=1
76transaction.state.log.min.isr=1
77
78############################# Log Flush Policy #############################
79
80# Messages are immediately written to the filesystem but by default we only fsync() to sync
81# the OS cache lazily. The following configurations control the flush of data to disk.
82# There are a few important trade-offs here:
83# 1. Durability: Unflushed data may be lost if you are not using replication.
84# 2. Latency: Very large flush intervals may lead to latency spikes when the flush does occur as there will be a lot of data to flush.
85# 3. Throughput: The flush is generally the most expensive operation, and a small flush interval may lead to excessive seeks.
86# The settings below allow one to configure the flush policy to flush data after a period of time or
87# every N messages (or both). This can be done globally and overridden on a per-topic basis.
88
89# The number of messages to accept before forcing a flush of data to disk
90#log.flush.interval.messages=10000
91
92# The maximum amount of time a message can sit in a log before we force a flush
93#log.flush.interval.ms=1000
94
95############################# Log Retention Policy #############################
96
97# The following configurations control the disposal of log segments. The policy can
98# be set to delete segments after a period of time, or after a given size has accumulated.
99# A segment will be deleted whenever *either* of these criteria are met. Deletion always happens
100# from the end of the log.
101
102# The minimum age of a log file to be eligible for deletion due to age
103log.retention.hours=168
104
105# A size-based retention policy for logs. Segments are pruned from the log unless the remaining
106# segments drop below log.retention.bytes. Functions independently of log.retention.hours.
107#log.retention.bytes=1073741824
108
109# The maximum size of a log segment file. When this size is reached a new log segment will be created.
110log.segment.bytes=1073741824
111
112# The interval at which log segments are checked to see if they can be deleted according
113# to the retention policies
114log.retention.check.interval.ms=300000
115
116############################# Zookeeper #############################
117
118# Zookeeper connection string (see zookeeper docs for details).
119# This is a comma separated host:port pairs, each corresponding to a zk
120# server. e.g. "127.0.0.1:3000,127.0.0.1:3001,127.0.0.1:3002".
121# You can also append an optional chroot string to the urls to specify the
122# root directory for all kafka znodes.
123zookeeper.connect=localhost:2181
124
125# Timeout in ms for connecting to zookeeper
126zookeeper.connection.timeout.ms=6000
127
128
129############################# Group Coordinator Settings #############################
130
131# The following configuration specifies the time, in milliseconds, that the GroupCoordinator will delay the initial consumer rebalance.
132# The rebalance will be further delayed by the value of group.initial.rebalance.delay.ms as new members join the group, up to a maximum of max.poll.interval.ms.
133# The default value for this is 3 seconds.
134# We override this to 0 here as it makes for a better out-of-the-box experience for development and testing.
135# However, in production environments the default value of 3 seconds is more suitable as this will help to avoid unnecessary, and potentially expensive, rebalances during application startup.
136group.initial.rebalance.delay.ms=0
137
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