{"id":1603,"date":"2024-01-25T16:03:20","date_gmt":"2024-01-25T08:03:20","guid":{"rendered":"https:\/\/fireinsect.top\/?p=1603"},"modified":"2024-02-02T17:03:29","modified_gmt":"2024-02-02T09:03:29","slug":"kafka%ef%bc%881%ef%bc%89-%e6%b6%88%e6%81%af%e9%98%9f%e5%88%97","status":"publish","type":"post","link":"https:\/\/fireinsect.top\/index.php\/2024\/01\/25\/kafka%ef%bc%881%ef%bc%89-%e6%b6%88%e6%81%af%e9%98%9f%e5%88%97\/","title":{"rendered":"Kafka\uff081\uff09—\u6d88\u606f\u961f\u5217"},"content":{"rendered":"\n

Kafka\u4e3b\u8981\u4f5c\u7528\u4e8e\u4e09\u4e2a\u9886\u57df\uff1a\u6d88\u606f\u961f\u5217\u3001\u5b58\u50a8\u548c\u6301\u7eed\u5904\u7406\u5927\u578b\u6570\u636e\u6d41\u3001\u5b9e\u65f6\u6d41\u5e73\u53f0<\/p>\n\n\n\n\n\n\n\n

\u4f5c\u4e3a\u6d88\u606f\u961f\u5217\uff0cKafka\u5141\u8bb8\u53d1\u5e03\u548c\u8ba2\u9605\u6570\u636e\uff0c\u8fd9\u70b9\u548c\u5176\u4ed6\u6d88\u606f\u961f\u5217\u7c7b\u4f3c\uff0c\u4f46\u4e0d\u540c\u7684\u662f\uff0cKafka\u4f5c\u4e3a\u4e00\u4e2a\u5206\u5e03\u5f0f\u7cfb\u7edf\uff0c\u662f\u4ee5\u96c6\u7fa4\u7684\u65b9\u5f0f\u8fd0\u884c\u7684\uff0c\u53ef\u4ee5\u81ea\u7531\u4f38\u7f29\u3002\u540c\u65f6\u8fd8\u63d0\u4f9b\u4e86\u6570\u636e\u4f20\u9012\u4fdd\u8bc1—\u53ef\u590d\u5236\u3001\u6301\u4e45\u5316\u7b49\u3002<\/p>\n\n\n\n

Kafka\u53ef\u4ee5\u5b58\u50a8\u548c\u6301\u7eed\u5904\u7406\u5927\u578b\u6570\u636e\u6d41\uff0c\u5e76\u4fdd\u6301\u6301\u7eed\u6027\u7684\u4f4e\u5ef6\u8fdf\u3002\u5c31\u8fd9\u70b9\u4e0a\uff0c\u53ef\u4ee5\u770b\u6210\u4e00\u4e2a\u5b9e\u65f6\u7248\u7684Hadoop\u3002<\/p>\n\n\n\n

\n

Kafka\u7684\u4f4e\u5ef6\u8fdf\u7279\u70b9\u66f4\u9002\u5408\u7528\u5728\u6838\u5fc3\u7684\u4e1a\u52a1\u5e94\u7528\u4e0a\uff0c\u5f53\u4e1a\u52a1\u4e8b\u4ef6\u53d1\u751f\u65f6\uff0cKafka\u80fd\u591f\u53ca\u65f6\u5bf9\u8fd9\u4e9b\u4e8b\u4ef6\u4f5c\u51fa\u54cd\u5e94\u3002<\/p>\n<\/blockquote>\n\n\n\n

Kafka\u5176\u5b9e\u662f\u4e00\u4e2a\u9762\u5411\u5b9e\u65f6\u6570\u636e\u7684\u6d41\u5e73\u53f0\uff0c\u4e5f\u5c31\u662f\u5b83\u4e0d\u4ec5\u53ef\u4ee5\u5c06\u73b0\u6709\u7684\u5e94\u7528\u7a0b\u5e8f\u548c\u6570\u636e\u7cfb\u7edf\u8fde\u63a5\u8d77\u6765\uff0c\u5b83\u8fd8\u80fd\u7528\u4e8e\u52a0\u5f3a\u8fd9\u4e9b\u89e6\u53d1\u76f8\u540c\u6570\u636e\u6d41\u7684\u5e94\u7528\u3002<\/p>\n\n\n\n

<\/div>\n\n\n\n

Kafka\u7684\u4f7f\u7528<\/h2>\n\n\n\n

Kafka\u7684\u5b89\u88c5\u5c31\u4e0d\u7279\u522b\u8bf4\u660e\u4e86\uff0c\u552f\u4e00\u9700\u8981\u6ce8\u610f\u7684\u662f\u5b89\u88c5Kafka\u4e4b\u524d\u9700\u8981\u5148\u5b89\u88c5\u5b83\u7684\u4f9d\u8d56\u533b\u7528 — zookeeper\uff0c\u5b83\u662f\u4e00\u4e2a\u5206\u5e03\u5f0f\u7684\u5e94\u7528\u7a0b\u5e8f\u534f\u8c03\u670d\u52a1\u3002<\/p>\n\n\n\n

<dependency>\n  <groupId>org.springframework.kafka<\/groupId>\n  <artifactId>spring-kafka<\/artifactId>\n<\/dependency><\/code><\/pre>\n\n\n\n
\u6dfb\u52a0\u4ee5\u4e0b\u914d\u7f6e\uff1a<\/p>\n\n\n\n
#============== kafka ===================\n# \u6307\u5b9akafka \u4ee3\u7406\u5730\u5740\uff0c\u53ef\u4ee5\u591a\u4e2a\nspring.kafka.bootstrap-servers={\u670d\u52a1\u5668\u516c\u7f51IP\u5730\u5740}:9093\n\n#=============== \u751f\u4ea7\u8005\u914d\u7f6e=======================\n\nspring.kafka.producer.retries=0\nspring.kafka.producer.batch-size=16384\nspring.kafka.producer.buffer-memory=33554432\nspring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.StringSerializer\nspring.kafka.producer.value-serializer=org.apache.kafka.common.serialization.StringSerializer\n\n#===============\u6d88\u8d39\u8005\u914d\u7f6e=======================\n# \u6307\u5b9a\u9ed8\u8ba4\u6d88\u8d39\u8005group id\nspring.kafka.consumer.group-id=test-consumer-group\nspring.kafka.consumer.auto-offset-reset=earliest\nspring.kafka.consumer.enable-auto-commit=true\nspring.kafka.consumer.auto-commit-interval=100\nspring.kafka.consumer.key-deserializer=org.apache.kafka.common.serialization.StringDeserializer\nspring.kafka.consumer.value-deserializer=org.apache.kafka.common.serialization.StringDeserializer<\/code><\/pre>\n\n\n\n
\u8fd9\u6837\u6211\u4eec\u5c31\u5b8c\u6210\u4e86SpringBoot\u7684\u88c5\u914d\u3002<\/p>\n\n\n\n
\u4f46\u5982\u4f55\u4f7f\u7528Kafka\u5462\uff1f\u9996\u5148\u6211\u4eec\u8981\u5148\u4e86\u89e3Kafka\u7684\u53d1\u5e03\u8ba2\u9605\u6d88\u606f\u7cfb\u7edf\u3002<\/p>\n\n\n\n
Kafka\u6d88\u606f\u8ba2\u9605\u7684\u524d\u63d0\u662f\u9700\u8981\u4e00\u4e2a\u4e3b\u9898\uff08topic\uff09\uff0c\u8fd9\u70b9\u4e0e\u4e4b\u524d\u7684RabbitMQ\u4e0d\u540c\u3002\u6bcf\u4e2a\u6d88\u606f\u90fd\u6709\u4e00\u4e2a\u660e\u786e\u7684topic\u6765\u7b5b\u9009\u6d88\u606f\u7684\u8ba2\u9605\u8005\uff0ctopic\u53ef\u4ee5\u5728\u751f\u4ea7\u65f6\u8fdb\u884c\u8bbe\u7f6e\u3002\u9664\u4e86\u4e3b\u9898\uff0c\u6700\u91cd\u8981\u7684\u5c31\u662f\u9700\u8981\u4e00\u4e2a\u6d88\u606f\u7684\u5185\u5bb9\u4e86\u3002<\/p>\n\n\n\n
\u5728Java\u4e2dKafka\u6d88\u606f\u7528\u7c7bProducerRecord<K,V><\/code>\u8868\u793a\u3002\u8fd9\u91cc\u7684V<\/code>\u6307\u7684\u5c31\u662f\u6d88\u606f\u7684\u5185\u5bb9\uff0c\u800cK<\/code>\u4e0d\u662f\u4e3b\u9898\uff0c\u53ef\u4ee5\u5c06\u5176\u5f53\u505a\u6d88\u606f\u7684\u9644\u52a0\u4fe1\u606f\uff0c\u56e0\u6b64\uff0c\u4e00\u4e2a\u6d88\u606f\u4f53\u7684\u7ed3\u6784\u5927\u81f4\u4e3a\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u5185\u5bb9\u5e8f\u5217\u5316<\/h3>\n\n\n\n
\u4e3a\u4e86\u7f51\u7edc\u4f20\u8f93\uff0c\u6211\u4eec\u901a\u5e38\u9700\u8981\u5c06\u5185\u5bb9\u8fdb\u884c\u5e8f\u5217\u5316\uff0cKafka\u4e5f\u662f\u5982\u6b64\uff0c\u9700\u8981\u5206\u522b\u5c06Key\u548cValue\u8fdb\u884c\u5e8f\u5217\u5316\u3002\u6211\u4eec\u5728\u4e4b\u524d\u7684\u914d\u7f6e\u5185\u5c31\u80fd\u770b\u5230\uff1a<\/p>\n\n\n\n
spring.kafka.producer.retries=0\nspring.kafka.producer.batch-size=16384\nspring.kafka.producer.buffer-memory=33554432\n\/\/#1. key\u5e8f\u5217\u5316\nspring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.StringSerializer\n\/\/#2. value\u5e8f\u5217\u5316\nspring.kafka.producer.value-serializer=org.apache.kafka.common.serialization.StringSerializer<\/code><\/pre>\n\n\n\n
\u53ef\u4ee5\u770b\u51fa\uff0ckey\u548cvalue\u90fd\u7528\u7684\u5b57\u7b26\u4e32\u5e8f\u5217\u5316\u65b9\u5f0f\u3002\u540c\u6837\u4e5f\u7ea6\u5b9a\u4e86\u6211\u4eec\u7684\u6d88\u606f\u4f53\uff0c\u5e94\u8be5ProducerRecord<String, String><\/code>\u7c7b\u578b\u3002<\/p>\n\n\n\n
\n
\u5f53\u7136Kafka\u8fd8\u63d0\u4f9b\u4e86\u6574\u6570<\/strong>\u548c\u5b57\u8282\u6570\u7ec4<\/strong>\u5e8f\u5217\u5316\u5668\uff0c\u751a\u81f3\u8fd8\u63d0\u4f9b\u4e86\u81ea\u5b9a\u4e49\u5e8f\u5217\u5316\u5668\u4f5c\u4e3a\u62d3\u5c55\u65b9\u6848\u3002<\/p>\n<\/blockquote>\n\n\n\n
\u52a0\u5165\u4e86\u5e8f\u5217\u5316\u5668\uff0c\u6211\u4eec\u7684\u6d88\u606f\u6d41\u7a0b\u5c31\u53d8\u6210\u4e86\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u4e3b\u9898\u5206\u533a<\/h3>\n\n\n\n
\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u9700\u8981\u8003\u8651\uff0c\u5bf9\u4e8e\u6d88\u606fKafka\u5e94\u8be5\u7528\u4ec0\u4e48\u6570\u636e\u7ed3\u6784\u5b58\u50a8\u5462\uff1f<\/p>\n\n\n\n
\u6d88\u606f\u9700\u8981\u6ee1\u8db3\u5148\u5165\u5148\u51fa\u7684\u89c4\u5219\uff0c\u6240\u4ee5\u6700\u597d\u4f7f\u7528\u961f\u5217\u8fdb\u884c\u5b58\u50a8\uff0c\u56e0\u6b64\u6211\u4eec\u79f0\u5176\u6d88\u606f\u961f\u5217\uff0c\u4f46Kafka\u662f\u4e3a\u4e86\u5e94\u5bf9\u5927\u91cf\u6570\u636e\uff0c\u5927\u6279\u6d88\u606f\u800c\u8bbe\u8ba1\u7684\uff0c\u7b80\u5355\u7684\u961f\u5217\u6a21\u578b\u663e\u7136\u4e0d\u652f\u6301\u8fd9\u4e48\u5927\u7684\u5e76\u53d1\uff0c\u6211\u4eec\u9700\u8981\u7cfb\u7edf\u652f\u6301\u6a2a\u5411\u62d3\u5c55\u80fd\u529b\u3002<\/p>\n\n\n\n
\u56e0\u6b64\uff0cKafka\u63d0\u51fa\u4e86\u5206\u533a\uff08Partition\uff09\u7684\u6982\u5ff5\uff0c\u6bcf\u4e2a\u5206\u533a\u90fd\u662f\u4e00\u4e2a\u961f\u5217\uff0c\u6bcf\u4e2a\u6d88\u606f\u4f1a\u6309\u7167\u4e00\u5b9a\u7684\u89c4\u5219\u653e\u7f6e\u5728\u67d0\u4e2a\u5206\u533a\u4e2d\u3002<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u5f53\u6d88\u606f\u901a\u8fc7\u5e8f\u5217\u5316\u5668\u5230\u8fbe\u5206\u533a\u5668\u65f6\uff0c\u7cfb\u7edf\u4f1a\u5148\u6839\u636eTopic\u5bfb\u627e\u5bf9\u5e94\u7684\u4e3b\u9898\u533a\u57df\uff0c\u518d\u901a\u8fc7\u89c4\u5219\u627e\u5230\u5bf9\u5e94\u4e3b\u9898\u4e0b\u7684\u5206\u533a\u3002<\/p>\n\n\n\n
\n
\u5728\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u6d88\u606f\u4f1a\u88ab\u968f\u673a\u53d1\u9001\u5230\u4e3b\u9898\u5185\u5404\u4e2a\u53ef\u7528\u7684\u5206\u533a\u4e0a\uff0c\u5e76\u4e14\u901a\u8fc7\u7b97\u6cd5\u4fdd\u8bc1\u5206\u533a\u6d88\u606f\u91cf\u5747\u8861<\/p>\n\n\n\n
\u5982\u679c\u6d88\u606f\u4f53\u91cc\u6709Key\uff0c\u5219\u4f1a\u6839\u636eKey\u7684\u54c8\u5e0c\u503c\u627e\u5230\u67d0\u4e2a\u56fa\u5b9a\u7684\u5206\u533a\uff0c\u4e5f\u5c31\u662f\u8bf4\u5982\u679ckey\u76f8\u540c\uff0c\u5206\u533a\u4e5f\u76f8\u540c\u3002<\/p>\n<\/blockquote>\n\n\n\n
\u4e86\u89e3\u8fd9\u4e9b\uff0c\u6211\u4eec\u5c31\u80fd\u53bb\u53d1\u9001\u6d88\u606f\u4e86\uff1a<\/p>\n\n\n\n
@Controller\n@RequestMapping(\"kafka\")\npublic class TestController {\n    @Autowired\n    private KafkaTemplate<String, String> kafkaTemplate;\n\n    \/\/\u53d1\u9001\u6d88\u606f\u65b9\u6cd5\n    @RequestMapping(\"\/send\")\n    @ResponseBody\n    public String send() {\n        \/\/ key\u4e0d\u4e3anull\n        kafkaTemplate.send(\"topic\",\"key\", \"value\");\n        \/\/ key\u4e3anull\n        kafkaTemplate.send(\"topic\", \"value\");\n        return \"success\";\n    }\n}<\/code><\/pre>\n\n\n\n
\u548cRedis\u7c7b\u4f3c\uff0cSpring\u4e5f\u63d0\u4f9b\u4e86Kafka\u7684\u5ba2\u6237\u7aef\u6765\u81ea\u52a8\u8fde\u63a5Kafka\uff0c\u5e76\u4e14\u7ea6\u5b9a\u6d88\u606f\u4f53\u7c7b\u578b\u3002<\/p>\n\n\n\n
\u9700\u8981\u6ce8\u610f\u7684\u5c31\u662f\uff0c\u6d88\u606f\u4f53\u7c7b\u578b\u9700\u8981\u548c\u914d\u7f6e\u7684\u5e8f\u5217\u5316\u5668\u76f8\u5bf9\u5e94\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u6d88\u8d39\u6d88\u606f<\/h3>\n\n\n\n
\u6b63\u5982\u5176\u4ed6\u6d88\u606f\u961f\u5217\u4e00\u6837\uff0c\u5b58\u5728\u751f\u4ea7\u8005\u5c31\u5b58\u5728\u6d88\u8d39\u8005\uff0cKafka\u4e5f\u5b58\u5728\u81ea\u5df1\u7684\u6d88\u8d39\u8005 — KafkaConsumer<\/code><\/p>\n\n\n\n
\u5bf9\u4e8e\u6d88\u8d39\u8005\uff0cKafka\u4e5f\u63d0\u4f9b\u4e86\u6a2a\u5411\u6269\u5c55\u7684\u80fd\u529b\uff0c\u5c31\u50cf\u591a\u4e2a\u751f\u4ea7\u8005\u53ef\u4ee5\u5411\u540c\u4e00\u4e2a\u4e3b\u9898\u5199\u5165\u6d88\u606f\u4e00\u6837\uff0c\u591a\u4e2a\u6d88\u8d39\u8005\u4e5f\u53ef\u4ee5\u4ece\u540c\u4e00\u4e2a\u4e3b\u9898\u8bfb\u53d6\u6d88\u606f\u3002<\/p>\n\n\n\n
\u8fd9\u5c31\u5b58\u5728\u4e00\u4e2a\u6982\u5ff5—\u6d88\u8d39\u8005\u7ec4<\/p>\n\n\n\n
\u4e00\u4e2a\u6d88\u8d39\u8005\u7ec4\u91cc\u7684\u6d88\u8d39\u8005\u8ba2\u9605\u540c\u4e00\u4e2a\u4e3b\u9898\uff0c\u6bcf\u4e2a\u6d88\u8d39\u8005\u63a5\u53d7\u4e3b\u9898\u7684\u4e00\u90e8\u5206\u5206\u533a\u7684\u6d88\u606f\u3002<\/p>\n\n\n\n
\u8fd9\u5c31\u5b58\u5728\u51e0\u4e2a\u4f8b\u5b50\uff1a<\/p>\n\n\n\n
\u6848\u4f8b1\uff1a\u5355\u6d88\u8d39\u8005<\/p>\n\n\n\n
\u5982\u679c\u4e00\u4e2a\u6d88\u8d39\u8005\u7ec4\u53ea\u6709\u4e00\u4e2a\u6d88\u8d39\u8005\uff0c\u5b83\u5c06\u6d88\u8d39\u8fd9\u4e2a\u4e3b\u9898\u4e0b\u6240\u6709\u7684\u5206\u533a\u6d88\u606f\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u6848\u4f8b2\uff1a\u591a\u6d88\u8d39\u8005<\/p>\n\n\n\n
\u5982\u679c\u4e00\u4e2a\u6d88\u8d39\u8005\u7ec4\u6709\u591a\u4e2a\u6d88\u8d39\u8005\uff08\u4f46\u4e0d\u8d85\u8fc7\u5206\u533a\u6570\u91cf\uff09\uff0c\u5b83\u5c06\u5747\u8861\u5206\u6d41\u6240\u6709\u5206\u533a\u7684\u6d88\u606f\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u5982\u679c\u6d88\u8d39\u8005\u6570\u91cf\u548c\u5206\u533a\u6570\u91cf\u76f8\u540c\uff0c\u6bcf\u4e2a\u6d88\u8d39\u8005\u63a5\u53d7\u4e00\u4e2a\u5206\u533a\u7684\u6d88\u606f\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\n
\u6ce8\u610f\u7684\u662f\uff0c\u4e00\u6761\u6d88\u606f\u53ea\u4f1a\u88ab\u540c\u7ec4\u6d88\u8d39\u4e00\u6b21\uff0c\u4e0d\u4f1a\u5728\u540c\u4e00\u4e2a\u6d88\u8d39\u8005\u7ec4\u91cc\u91cd\u590d\u6d88\u8d39\uff0c\u5177\u6709\u6392\u4ed6\u6027\u3002<\/p>\n\n\n\n
\n
\u5df2\u7ecf\u6536\u5230\u6d88\u606f\u7684\u6d88\u8d39\u8005\u91cd\u542f\u8ba1\u7b97\u673a\u540e\uff0c\u4e5f\u4e0d\u4f1a\u518d\u6b21\u63a5\u53d7\u540c\u4e00\u6761\u6d88\u606f\u3002<\/p>\n<\/blockquote>\n<\/blockquote>\n\n\n\n
\u6848\u4f8b3\uff1a\u8d85\u6d88\u8d39\u8005<\/p>\n\n\n\n
\u5982\u679c\u6d88\u8d39\u8005\u6570\u91cf\u5927\u4e8e\u5206\u533a\u6570\u91cf\uff0c\u90a3\u4e48\u4e00\u90e8\u5206\u6d88\u8d39\u8005\u5c06\u95f2\u7f6e\uff0c\u4e0d\u4f1a\u63a5\u53d7\u4efb\u4f55\u6d88\u606f\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u6848\u4f8b4\uff1a\u591a\u6d88\u8d39\u8005\u7ec4<\/p>\n\n\n\n
\u5982\u679c\u6211\u4eec\u5b58\u5728\u591a\u4e2a\u6d88\u8d39\u8005\u7ec4\uff0c\u8ba2\u9605\u4e86\u540c\u6837\u7684\u4e3b\u9898\uff0c\u4f1a\u600e\u4e48\u6837\u5462\uff1f<\/p>\n\n\n\n
\u591a\u4e2a\u6d88\u8d39\u8005\u7ec4\u5c06\u4f1a\u5206\u522b\u6d88\u8d39\u8fd9\u4e2a\u6d88\u606f\uff0c\u5373\u4e00\u4e2a\u6d88\u606f\u90fd\u4f1a\u901a\u77e5\u6bcf\u4e2a\u6d88\u8d39\u8005\u7ec4\u3002<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u5b9e\u73b0\u6d88\u606f\u6d88\u8d39\uff0c\u4e0e\u751f\u4ea7\u7c7b\u4f3c\uff0c\u9996\u5148\u9700\u8981\u6307\u5b9a\u53cd\u5e8f\u5217\u5316\u5668\uff1a<\/p>\n\n\n\n
\/\/ \u914d\u7f6e\u6d88\u8d39\u8005\u7ec4\nspring.kafka.consumer.group-id=test-consumer-group\nspring.kafka.consumer.auto-offset-reset=earliest\nspring.kafka.consumer.enable-auto-commit=true\nspring.kafka.consumer.auto-commit-interval=100\n\/\/ \u914d\u7f6e\u6d88\u606f\u4f53Key\u53cd\u5e8f\u5217\u5316\u5668\nspring.kafka.consumer.key-deserializer=org.apache.kafka.common.serialization.StringDeserializer\n\/\/ \u914d\u7f6e\u6d88\u606f\u4f53Value\u53cd\u5e8f\u5217\u5316\u5668\nspring.kafka.consumer.value-deserializer=org.apache.kafka.common.serialization.StringDeserializer<\/code><\/pre>\n\n\n\n
\u5b9e\u73b0\u4ee3\u7801\uff1a<\/p>\n\n\n\n
@Component\npublic class KafkaReceiver {\n\n  \/\/ #1. \u76d1\u542c\u4e3b\u9898\u4e3atopic\u7684\u6d88\u606f\n  @KafkaListener(topics = {\"topic\"})\n  public void listen(ConsumerRecord<?, ?> record) {\n    \/\/ #2. \u5982\u679c\u6d88\u606f\u5b58\u5728\n    Optional<?> kafkaMessage = Optional.ofNullable(record.value());\n    if (kafkaMessage.isPresent()) {\n      \/\/ #3. \u83b7\u53d6\u6d88\u606f\n      Object message = kafkaMessage.get();\n      System.out.println(\"message =\" + message);\n    }\n\n  }\n}<\/code><\/pre>\n\n\n\n
\u5176\u4e2dOptional<\/code> \u662f Java8 \u7684\u5de5\u5177\u7c7b\uff0c\u4e3b\u8981\u7528\u4e8e\u89e3\u51b3\u7a7a\u6307\u9488\u5f02\u5e38\u7684\u95ee\u9898\u3002\u5b83\u63d0\u4f9b\u5f88\u591a\u6709\u7528\u7684\u65b9\u6cd5\uff0c\u8fd9\u6837\u6211\u4eec\u5c31\u4e0d\u7528\u663e\u5f0f\u8fdb\u884c\u7a7a\u503c\u68c0\u6d4b\u3002\u8fd9\u91cc\u4e3b\u8981\u7528\u5230\u4e09\u4e2a\u5e38\u7528\u7684\u65b9\u6cd5\uff0c\u4ee5\u5224\u65ad\u6d88\u606f\u662f\u5426\u5b58\u5728\uff0c\u5982\u679c\u5b58\u5728\u5219\u53d6\u51fa\u6d88\u606f\u503c\u3002<\/p>\n\n\n\n
\n
\u4e00\u4e9b\u6ce8\u610f\u70b9\uff1a<\/p>\n\n\n\n
    \n
  • kafkaTemplate.send()<\/code> \u662f\u4e00\u4e2a\u5f02\u6b65\u7684\u53d1\u9001\u65b9\u6cd5\uff0c\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u5e94\u8be5\u4e0d\u4f1a\u963b\u585e\u4e3b\u7ebf\u7a0b\uff09\uff0c\u4f46\u5b9e\u9645\u4e0a\u67d0\u4e9b\u60c5\u51b5\u4e0b\u4ecd\u7136\u4f1a\u51fa\u73b0\u963b\u585e\u4e3b\u7ebf\u7a0b\u7684\u60c5\u51b5\u3002
    \u5982\u7b2c\u4e00\u6b21\u53d1\u9001\u6d88\u606f\u65f6\uff0c\u9700\u8981\u8fde\u63a5Kafka\uff0c\u5e76\u4e14\u521b\u5efatopic\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u662f\u963b\u585e\u7684<\/li>\n<\/ul>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"
    Kafka\u4e3b\u8981\u4f5c\u7528\u4e8e\u4e09\u4e2a\u9886\u57df\uff1a\u6d88\u606f\u961f\u5217\u3001\u5b58\u50a8\u548c\u6301\u7eed\u5904\u7406\u5927\u578b\u6570\u636e\u6d41\u3001\u5b9e\u65f6\u6d41\u5e73\u53f0<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","footnotes":""},"categories":[6,1],"tags":[],"class_list":["post-1603","post","type-post","status-publish","format-standard","hentry","category-6","category-wcd"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/posts\/1603"}],"collection":[{"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/comments?post=1603"}],"version-history":[{"count":3,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/posts\/1603\/revisions"}],"predecessor-version":[{"id":1635,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/posts\/1603\/revisions\/1635"}],"wp:attachment":[{"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/media?parent=1603"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/categories?post=1603"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fireinsect.top\/index.php\/wp-json\/wp\/v2\/tags?post=1603"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}