增加 skywalking 示例 - kafka

lab-39/lab-39-kafka/pom.xml

@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.2.2.RELEASE</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>lab-39-kafka</artifactId>
+
+    <dependencies>
+        <!-- 引入 Spring-Kafka 依赖 -->
+        <!-- 已经内置 kafka-clients 依赖，所以无需重复引入 -->
+        <dependency>
+            <groupId>org.springframework.kafka</groupId>
+            <artifactId>spring-kafka</artifactId>
+            <version>2.3.3.RELEASE</version>
+        </dependency>
+
+        <!-- 实现对 SpringMVC 的自动化配置 -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+    </dependencies>
+
+</project>

lab-39/lab-39-kafka/src/main/java/cn/iocoder/springboot/lab39/skywalkingdemo/KafkaApplication.java

@@ -0,0 +1,13 @@
+package cn.iocoder.springboot.lab39.skywalkingdemo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class KafkaApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(KafkaApplication.class, args);
+    }
+
+}

lab-39/lab-39-kafka/src/main/java/cn/iocoder/springboot/lab39/skywalkingdemo/consumer/DemoConsumer.java

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+package cn.iocoder.springboot.lab39.skywalkingdemo.consumer;
+
+import cn.iocoder.springboot.lab39.skywalkingdemo.message.DemoMessage;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.kafka.annotation.KafkaListener;
+import org.springframework.stereotype.Component;
+
+@Component
+public class DemoConsumer {
+
+    private Logger logger = LoggerFactory.getLogger(getClass());
+
+    @KafkaListener(topics = DemoMessage.TOPIC,
+            groupId = "demo-consumer-group-" + DemoMessage.TOPIC)
+    public void onMessage(DemoMessage message) {
+        logger.info("[onMessage][线程编号:{} 消息内容：{}]", Thread.currentThread().getId(), message);
+    }
+
+}

lab-39/lab-39-kafka/src/main/java/cn/iocoder/springboot/lab39/skywalkingdemo/controller/DemoController.java

@@ -0,0 +1,28 @@
+package cn.iocoder.springboot.lab39.skywalkingdemo.controller;
+
+import cn.iocoder.springboot.lab39.skywalkingdemo.producer.DemoProducer;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.concurrent.ExecutionException;
+
+@RestController
+@RequestMapping("/demo")
+public class DemoController {
+
+    @Autowired
+    private DemoProducer producer;
+
+    @GetMapping("/kafka")
+    public String echo() throws ExecutionException, InterruptedException {
+        this.sendMessage(1);
+        return "kafka";
+    }
+
+    public void sendMessage(Integer id) throws ExecutionException, InterruptedException {
+        producer.syncSend(id);
+    }
+
+}

lab-39/lab-39-kafka/src/main/java/cn/iocoder/springboot/lab39/skywalkingdemo/message/DemoMessage.java

@@ -0,0 +1,31 @@
+package cn.iocoder.springboot.lab39.skywalkingdemo.message;
+
+/**
+ * 示例 Message 消息
+ */
+public class DemoMessage {
+
+    public static final String TOPIC = "DEMO";
+
+    /**
+     * 编号
+     */
+    private Integer id;
+
+    public DemoMessage setId(Integer id) {
+        this.id = id;
+        return this;
+    }
+
+    public Integer getId() {
+        return id;
+    }
+
+    @Override
+    public String toString() {
+        return "DemoMessage{" +
+                "id=" + id +
+                '}';
+    }
+
+}

lab-39/lab-39-kafka/src/main/java/cn/iocoder/springboot/lab39/skywalkingdemo/producer/DemoProducer.java

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+package cn.iocoder.springboot.lab39.skywalkingdemo.producer;
+
+import cn.iocoder.springboot.lab39.skywalkingdemo.message.DemoMessage;
+import org.springframework.kafka.core.KafkaTemplate;
+import org.springframework.kafka.support.SendResult;
+import org.springframework.stereotype.Component;
+
+import javax.annotation.Resource;
+import java.util.concurrent.ExecutionException;
+
+@Component
+public class DemoProducer {
+
+    @Resource
+    private KafkaTemplate<Object, Object> kafkaTemplate;
+
+    public SendResult syncSend(Integer id) throws ExecutionException, InterruptedException {
+        // 创建 DemoMessage 消息
+        DemoMessage message = new DemoMessage();
+        message.setId(id);
+        // 同步发送消息
+        return kafkaTemplate.send(DemoMessage.TOPIC, message).get();
+    }
+
+}

lab-39/lab-39-kafka/src/main/resources/application.yaml

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+server:
+  port: 8079
+
+spring:
+  # Kafka 配置项，对应 KafkaProperties 配置类
+  kafka:
+    bootstrap-servers: 127.0.0.1:9092 # 指定 Kafka Broker 地址，可以设置多个，以逗号分隔
+    # Kafka Producer 配置项
+    producer:
+      acks: 1 # 0-不应答。1-leader 应答。all-所有 leader 和 follower 应答。
+      retries: 3 # 发送失败时，重试发送的次数
+      key-serializer: org.apache.kafka.common.serialization.StringSerializer # 消息的 key 的序列化
+      value-serializer: org.springframework.kafka.support.serializer.JsonSerializer # 消息的 value 的序列化
+    # Kafka Consumer 配置项
+    consumer:
+      auto-offset-reset: earliest # 设置消费者分组最初的消费进度为 earliest 。可参考博客 https://blog.csdn.net/lishuangzhe7047/article/details/74530417 理解
+      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
+      value-deserializer: org.springframework.kafka.support.serializer.JsonDeserializer
+      properties:
+        spring:
+          json:
+            trusted:
+              packages: cn.iocoder.springboot.lab39.skywalkingdemo.message # 消息 POJO 可信目录，解决 JSON 无法反序列化的问题
+    # Kafka Consumer Listener 监听器配置
+    listener:
+      missing-topics-fatal: false # 消费监听接口监听的主题不存在时，默认会报错。所以通过设置为 false ，解决报错

lab-39/lab-39-kafka/target/classes/application.yaml

@@ -0,0 +1,26 @@
+server:
+  port: 8079
+
+spring:
+  # Kafka 配置项，对应 KafkaProperties 配置类
+  kafka:
+    bootstrap-servers: 127.0.0.1:9092 # 指定 Kafka Broker 地址，可以设置多个，以逗号分隔
+    # Kafka Producer 配置项
+    producer:
+      acks: 1 # 0-不应答。1-leader 应答。all-所有 leader 和 follower 应答。
+      retries: 3 # 发送失败时，重试发送的次数
+      key-serializer: org.apache.kafka.common.serialization.StringSerializer # 消息的 key 的序列化
+      value-serializer: org.springframework.kafka.support.serializer.JsonSerializer # 消息的 value 的序列化
+    # Kafka Consumer 配置项
+    consumer:
+      auto-offset-reset: earliest # 设置消费者分组最初的消费进度为 earliest 。可参考博客 https://blog.csdn.net/lishuangzhe7047/article/details/74530417 理解
+      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
+      value-deserializer: org.springframework.kafka.support.serializer.JsonDeserializer
+      properties:
+        spring:
+          json:
+            trusted:
+              packages: cn.iocoder.springboot.lab39.skywalkingdemo.message # 消息 POJO 可信目录，解决 JSON 无法反序列化的问题
+    # Kafka Consumer Listener 监听器配置
+    listener:
+      missing-topics-fatal: false # 消费监听接口监听的主题不存在时，默认会报错。所以通过设置为 false ，解决报错

lab-39/pom.xml

@@ -20,6 +20,7 @@
         <module>lab-39-elasticsearch</module>
         <module>lab-39-elasticsearch-jest</module>
         <module>lab-39-rocketmq</module>
+        <module>lab-39-kafka</module>
     </modules>
 
 </project>