{"id":21450,"date":"2024-03-15T22:07:20","date_gmt":"2024-03-15T22:07:20","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-send-and-receive-messages-in-kafka\/"},"modified":"2024-03-21T20:30:54","modified_gmt":"2024-03-21T20:30:54","slug":"how-to-send-and-receive-messages-in-kafka","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-send-and-receive-messages-in-kafka\/","title":{"rendered":"How to send and receive messages in Kafka?"},"content":{"rendered":"<p>In Kafka, producers and consumers can be used to send and receive messages.<\/p>\n<p>Send a message:<\/p>\n<ol>\n<li>Firstly, create a producer instance and configure the relevant properties.<\/li>\n<li>transmit()<\/li>\n<\/ol>\n<p>Receive messages:<\/p>\n<ol>\n<li>Firstly, create a consumer instance and configure the relevant properties.<\/li>\n<li>sign up<\/li>\n<li>conducting a survey<\/li>\n<li>Handle the received messages.<\/li>\n<\/ol>\n<p>Below is a simple example code demonstrating how to send and receive messages.<\/p>\n<p>send message:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> org.apache.kafka.clients.producer.*;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">ProducerExample<\/span> {\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> {\r\n        <span class=\"hljs-type\">Properties<\/span> <span class=\"hljs-variable\">props<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Properties<\/span>();\r\n        props.put(<span class=\"hljs-string\">\"bootstrap.servers\"<\/span>, <span class=\"hljs-string\">\"localhost:9092\"<\/span>);\r\n        props.put(<span class=\"hljs-string\">\"key.serializer\"<\/span>, <span class=\"hljs-string\">\"org.apache.kafka.common.serialization.StringSerializer\"<\/span>);\r\n        props.put(<span class=\"hljs-string\">\"value.serializer\"<\/span>, <span class=\"hljs-string\">\"org.apache.kafka.common.serialization.StringSerializer\"<\/span>);\r\n\r\n        Producer&lt;String, String&gt; producer = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">KafkaProducer<\/span>&lt;&gt;(props);\r\n\r\n        <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">topic<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"my-topic\"<\/span>;\r\n        <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">message<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"Hello, Kafka!\"<\/span>;\r\n\r\n        ProducerRecord&lt;String, String&gt; record = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">ProducerRecord<\/span>&lt;&gt;(topic, message);\r\n\r\n        producer.send(record, <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Callback<\/span>() {\r\n            <span class=\"hljs-meta\">@Override<\/span>\r\n            <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">onCompletion<\/span><span class=\"hljs-params\">(RecordMetadata metadata, Exception exception)<\/span> {\r\n                <span class=\"hljs-keyword\">if<\/span> (exception != <span class=\"hljs-literal\">null<\/span>) {\r\n                    System.err.println(<span class=\"hljs-string\">\"Failed to send message: \"<\/span> + exception.getMessage());\r\n                } <span class=\"hljs-keyword\">else<\/span> {\r\n                    System.out.println(<span class=\"hljs-string\">\"Message sent successfully! Offset: \"<\/span> + metadata.offset());\r\n                }\r\n            }\r\n        });\r\n\r\n        producer.close();\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>Receive message.<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> org.apache.kafka.clients.consumer.*;\r\n<span class=\"hljs-keyword\">import<\/span> org.apache.kafka.common.*;\r\n\r\n<span class=\"hljs-keyword\">import<\/span> java.time.Duration;\r\n<span class=\"hljs-keyword\">import<\/span> java.util.Collections;\r\n<span class=\"hljs-keyword\">import<\/span> java.util.Properties;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">ConsumerExample<\/span> {\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> {\r\n        <span class=\"hljs-type\">Properties<\/span> <span class=\"hljs-variable\">props<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Properties<\/span>();\r\n        props.put(<span class=\"hljs-string\">\"bootstrap.servers\"<\/span>, <span class=\"hljs-string\">\"localhost:9092\"<\/span>);\r\n        props.put(<span class=\"hljs-string\">\"key.deserializer\"<\/span>, <span class=\"hljs-string\">\"org.apache.kafka.common.serialization.StringDeserializer\"<\/span>);\r\n        props.put(<span class=\"hljs-string\">\"value.deserializer\"<\/span>, <span class=\"hljs-string\">\"org.apache.kafka.common.serialization.StringDeserializer\"<\/span>);\r\n        props.put(<span class=\"hljs-string\">\"group.id\"<\/span>, <span class=\"hljs-string\">\"my-group\"<\/span>);\r\n\r\n        Consumer&lt;String, String&gt; consumer = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">KafkaConsumer<\/span>&lt;&gt;(props);\r\n\r\n        <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">topic<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"my-topic\"<\/span>;\r\n\r\n        consumer.subscribe(Collections.singletonList(topic));\r\n\r\n        <span class=\"hljs-keyword\">while<\/span> (<span class=\"hljs-literal\">true<\/span>) {\r\n            ConsumerRecords&lt;String, String&gt; records = consumer.poll(Duration.ofSeconds(<span class=\"hljs-number\">1<\/span>));\r\n\r\n            <span class=\"hljs-keyword\">for<\/span> (ConsumerRecord&lt;String, String&gt; record : records) {\r\n                System.out.println(<span class=\"hljs-string\">\"Received message: \"<\/span> + record.value());\r\n            }\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>The above code is implemented using a Java client, but you can choose other languages or Kafka client libraries according to your own needs to send and receive messages.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In Kafka, producers and consumers can be used to send and receive messages. Send a message: Firstly, create a producer instance and configure the relevant properties. transmit() Receive messages: Firstly, create a consumer instance and configure the relevant properties. sign up conducting a survey Handle the received messages. Below is a simple example code demonstrating [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-21450","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to send and receive messages in Kafka? - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/how-to-send-and-receive-messages-in-kafka\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to send and receive messages in Kafka?\" \/>\n<meta property=\"og:description\" content=\"In Kafka, producers and consumers can be used to send and receive messages. Send a message: Firstly, create a producer instance and configure the relevant properties. transmit() Receive messages: Firstly, create a consumer instance and configure the relevant properties. sign up conducting a survey Handle the received messages. 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