{"id":94377,"date":"2024-03-21T17:50:43","date_gmt":"2024-03-21T08:50:43","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java-udp%e9%80%9a%e4%bf%a1%e3%82%92%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86%e3%81%ab%e5%ae%9f%e8%a3%85%e3%81%99%e3%82%8b%e3%81%ae%e3%81%a7%e3%81%99%e3%81%8b\/"},"modified":"2024-03-28T05:45:09","modified_gmt":"2024-03-27T20:45:09","slug":"java-udp%e9%80%9a%e4%bf%a1%e3%82%92%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86%e3%81%ab%e5%ae%9f%e8%a3%85%e3%81%99%e3%82%8b%e3%81%ae%e3%81%a7%e3%81%99%e3%81%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java-udp%e9%80%9a%e4%bf%a1%e3%82%92%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86%e3%81%ab%e5%ae%9f%e8%a3%85%e3%81%99%e3%82%8b%e3%81%ae%e3%81%a7%e3%81%99%e3%81%8b\/","title":{"rendered":"JAVA UDP\u901a\u4fe1\u3092\u3069\u306e\u3088\u3046\u306b\u5b9f\u88c5\u3059\u308b\u306e\u3067\u3059\u304b"},"content":{"rendered":"<p>Java\u3067UDP\u901a\u4fe1\u3092\u5b9f\u73fe\u3059\u308b\u306b\u306f\u3001Java\u306ejava.net\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u3042\u308bDatagramSocket\u30af\u30e9\u30b9\u3068DatagramPacket\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<ol>\n<li>\u30dd\u30fc\u30c8\u756a\u53f7\u3092\u6307\u5b9a\u3057\u3066DatagramSocket\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">DatagramSocket<\/span> <span class=\"hljs-variable\">socket<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">DatagramSocket<\/span>(<span class=\"hljs-number\">8888<\/span>);\r\n<\/code><\/pre>\n<ol>\n<li>\u30c7\u30fc\u30bf\u3092\u53d7\u3051\u53d6\u308b\u305f\u3081\u306e\u30d0\u30a4\u30c8\u914d\u5217\u3092\u4f5c\u6210\u3057\u3001\u30c7\u30fc\u30bf\u3092\u53d7\u3051\u53d6\u308b\u305f\u3081\u306e DatagramPacket \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">byte<\/span>[] buffer = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">byte<\/span>[<span class=\"hljs-number\">1024<\/span>];\r\n<span class=\"hljs-type\">DatagramPacket<\/span> <span class=\"hljs-variable\">packet<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">DatagramPacket<\/span>(buffer, buffer.length);\r\n<\/code><\/pre>\n<ol>\n<li>DatagramSocket\u3067\u53d7\u4fe1\u30c7\u30fc\u30bf\u3092receive()\u30e1\u30bd\u30c3\u30c9\u3067\u53d7\u3051\u53d6\u308b\uff1a<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code>socket.receive(packet);\r\n<\/code><\/pre>\n<ol>\n<li>\u53d7\u4fe1\u3057\u305f\u30c7\u30fc\u30bf\u306f\u3001DatagramPacket\u306egetData()\u30e1\u30bd\u30c3\u30c9\u3067\u53d6\u5f97\u3059\u308b\u3002<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">byte<\/span>[] receivedData = packet.getData();\r\n<\/code><\/pre>\n<ol>\n<li>\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3059\u308b\u305f\u3081\u306e\u30d0\u30a4\u30c8\u914d\u5217\u3092\u4f5c\u6210\u3057\u3001\u305d\u306e\u30c7\u30fc\u30bf\u3092\u9001\u4fe1\u3059\u308b\u305f\u3081\u306b DatagramPacket \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u3002<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">message<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"Hello, UDP!\"<\/span>;\r\n<span class=\"hljs-type\">byte<\/span>[] sendData = message.getBytes();\r\n<span class=\"hljs-type\">InetAddress<\/span> <span class=\"hljs-variable\">address<\/span> <span class=\"hljs-operator\">=<\/span> InetAddress.getByName(<span class=\"hljs-string\">\"localhost\"<\/span>);\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">port<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">8888<\/span>;\r\n<span class=\"hljs-type\">DatagramPacket<\/span> <span class=\"hljs-variable\">sendPacket<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">DatagramPacket<\/span>(sendData, sendData.length, address, port);\r\n<\/code><\/pre>\n<ol>\n<li>DatagramSocket.send()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30c7\u30fc\u30bf\u3092\u9001\u4fe1\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code>socket.send(sendPacket);\r\n<\/code><\/pre>\n<ol>\n<li>DatagramSocket\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u9589\u3058\u308b<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code>socket.close();\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0b\u306e\u5b8c\u5168\u306a\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> java.net.DatagramPacket;\r\n<span class=\"hljs-keyword\">import<\/span> java.net.DatagramSocket;\r\n<span class=\"hljs-keyword\">import<\/span> java.net.InetAddress;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">UdpExample<\/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-keyword\">try<\/span> {\r\n            <span class=\"hljs-comment\">\/\/ \u521b\u5efaDatagramSocket\u5bf9\u8c61\uff0c\u6307\u5b9a\u7aef\u53e3\u53f7<\/span>\r\n            <span class=\"hljs-type\">DatagramSocket<\/span> <span class=\"hljs-variable\">socket<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">DatagramSocket<\/span>(<span class=\"hljs-number\">8888<\/span>);\r\n\r\n            <span class=\"hljs-comment\">\/\/ \u521b\u5efa\u63a5\u6536\u6570\u636e\u7684\u5b57\u8282\u6570\u7ec4\u548cDatagramPacket\u5bf9\u8c61<\/span>\r\n            <span class=\"hljs-type\">byte<\/span>[] buffer = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">byte<\/span>[<span class=\"hljs-number\">1024<\/span>];\r\n            <span class=\"hljs-type\">DatagramPacket<\/span> <span class=\"hljs-variable\">packet<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">DatagramPacket<\/span>(buffer, buffer.length);\r\n\r\n            <span class=\"hljs-comment\">\/\/ \u63a5\u6536\u6570\u636e<\/span>\r\n            socket.receive(packet);\r\n\r\n            <span class=\"hljs-comment\">\/\/ \u83b7\u53d6\u63a5\u6536\u5230\u7684\u6570\u636e<\/span>\r\n            <span class=\"hljs-type\">byte<\/span>[] receivedData = packet.getData();\r\n            <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">receivedMessage<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">String<\/span>(receivedData, <span class=\"hljs-number\">0<\/span>, packet.getLength());\r\n            System.out.println(<span class=\"hljs-string\">\"Received message: \"<\/span> + receivedMessage);\r\n\r\n            <span class=\"hljs-comment\">\/\/ \u51c6\u5907\u53d1\u9001\u6570\u636e<\/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, UDP!\"<\/span>;\r\n            <span class=\"hljs-type\">byte<\/span>[] sendData = message.getBytes();\r\n            <span class=\"hljs-type\">InetAddress<\/span> <span class=\"hljs-variable\">address<\/span> <span class=\"hljs-operator\">=<\/span> InetAddress.getByName(<span class=\"hljs-string\">\"localhost\"<\/span>);\r\n            <span class=\"hljs-type\">int<\/span> <span class=\"hljs-variable\">port<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-number\">8888<\/span>;\r\n            <span class=\"hljs-type\">DatagramPacket<\/span> <span class=\"hljs-variable\">sendPacket<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">DatagramPacket<\/span>(sendData, sendData.length, address, port);\r\n\r\n            <span class=\"hljs-comment\">\/\/ \u53d1\u9001\u6570\u636e<\/span>\r\n            socket.send(sendPacket);\r\n\r\n            <span class=\"hljs-comment\">\/\/ \u5173\u95edDatagramSocket<\/span>\r\n            socket.close();\r\n        } <span class=\"hljs-keyword\">catch<\/span> (Exception e) {\r\n            e.printStackTrace();\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u5b9f\u969b\u306b\u306f\u3001\u53d7\u4fe1\u3068\u9001\u4fe1\u3092\u540c\u6642\u306b\u884c\u3046\u306b\u306f\u3001\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067UDP\u901a\u4fe1\u3092\u5b9f\u73fe\u3059\u308b\u306b\u306f\u3001Java\u306ejava.net\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u3042\u308bDatagramSocket\u30af\u30e9\u30b9\u3068DatagramPacket\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002 \u30dd\u30fc\u30c8\u756a\u53f7\u3092\u6307\u5b9a\u3057\u3066DatagramSocket\u30aa\u30d6\u30b8\u30a7 [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-94377","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>JAVA UDP\u901a\u4fe1\u3092\u3069\u306e\u3088\u3046\u306b\u5b9f\u88c5\u3059\u308b\u306e\u3067\u3059\u304b - 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\/ja\/blog\/java-udp\u901a\u4fe1\u3092\u3069\u306e\u3088\u3046\u306b\u5b9f\u88c5\u3059\u308b\u306e\u3067\u3059\u304b\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta 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