{"id":28714,"date":"2024-03-18T18:42:00","date_gmt":"2024-03-18T09:42:00","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e3%83%90%e3%82%a4%e3%83%8a%e3%83%aa%e5%bd%a2%e5%bc%8f%e3%81%ab%e5%a4%89%e6%8f%9b%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95\/"},"modified":"2024-03-22T19:15:14","modified_gmt":"2024-03-22T10:15:14","slug":"java%e3%81%a7%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e3%83%90%e3%82%a4%e3%83%8a%e3%83%aa%e5%bd%a2%e5%bc%8f%e3%81%ab%e5%a4%89%e6%8f%9b%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e3%83%90%e3%82%a4%e3%83%8a%e3%83%aa%e5%bd%a2%e5%bc%8f%e3%81%ab%e5%a4%89%e6%8f%9b%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95\/","title":{"rendered":"Java\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u30d0\u30a4\u30ca\u30ea\u5f62\u5f0f\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f"},"content":{"rendered":"<p>Java\u3067\u306f\u3001\u30d5\u30a1\u30a4\u30eb\u3092\u30d0\u30a4\u30ca\u30ea\u5f62\u5f0f\u306b\u5909\u63db\u3059\u308b\u305f\u3081\u306b\u3001java.io\u30d1\u30c3\u30b1\u30fc\u30b8\u306eFileInputStream\u30af\u30e9\u30b9\u3084java.nio\u30d1\u30c3\u30b1\u30fc\u30b8\u306eByteBuffer\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u6700\u521d\u3001FileInputStream\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u306e\u5185\u5bb9\u3092\u8aad\u307f\u53d6\u308a\u3001\u305d\u308c\u3092byte\u914d\u5217\u306b\u4fdd\u5b58\u3057\u307e\u3059\u3002\u305d\u3057\u3066\u3001ByteBuffer\u30af\u30e9\u30b9\u3092\u4f7f\u3063\u3066byte\u914d\u5217\u3092\u30d0\u30a4\u30ca\u30ea\u5f62\u5f0f\u306b\u5909\u63db\u3057\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306f\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> java.io.File;\r\n<span class=\"hljs-keyword\">import<\/span> java.io.FileInputStream;\r\n<span class=\"hljs-keyword\">import<\/span> java.io.IOException;\r\n<span class=\"hljs-keyword\">import<\/span> java.nio.ByteBuffer;\r\n<span class=\"hljs-keyword\">import<\/span> java.nio.channels.FileChannel;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">FileToBinaryConverter<\/span> {\r\n\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\r\n        <span class=\"hljs-comment\">\/\/ \u6307\u5b9a\u6587\u4ef6\u8def\u5f84<\/span>\r\n        <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">filePath<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-string\">\"path\/to\/file.jpg\"<\/span>;\r\n        \r\n        <span class=\"hljs-keyword\">try<\/span> {\r\n            <span class=\"hljs-comment\">\/\/ \u521b\u5efaFile\u5bf9\u8c61<\/span>\r\n            <span class=\"hljs-type\">File<\/span> <span class=\"hljs-variable\">file<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">File<\/span>(filePath);\r\n            \r\n            <span class=\"hljs-comment\">\/\/ \u521b\u5efaFileInputStream\u5bf9\u8c61<\/span>\r\n            <span class=\"hljs-type\">FileInputStream<\/span> <span class=\"hljs-variable\">fis<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">FileInputStream<\/span>(file);\r\n            \r\n            <span class=\"hljs-comment\">\/\/ \u521b\u5efaFileChannel\u5bf9\u8c61<\/span>\r\n            <span class=\"hljs-type\">FileChannel<\/span> <span class=\"hljs-variable\">channel<\/span> <span class=\"hljs-operator\">=<\/span> fis.getChannel();\r\n            \r\n            <span class=\"hljs-comment\">\/\/ \u521b\u5efaByteBuffer\u5bf9\u8c61<\/span>\r\n            <span class=\"hljs-type\">ByteBuffer<\/span> <span class=\"hljs-variable\">buffer<\/span> <span class=\"hljs-operator\">=<\/span> ByteBuffer.allocate((<span class=\"hljs-type\">int<\/span>) channel.size());\r\n            \r\n            <span class=\"hljs-comment\">\/\/ \u5c06\u6587\u4ef6\u5185\u5bb9\u8bfb\u5165ByteBuffer<\/span>\r\n            channel.read(buffer);\r\n            \r\n            <span class=\"hljs-comment\">\/\/ \u5c06ByteBuffer\u8f6c\u6362\u4e3a\u4e8c\u8fdb\u5236\u683c\u5f0f<\/span>\r\n            <span class=\"hljs-type\">byte<\/span>[] binaryData = buffer.array();\r\n            \r\n            <span class=\"hljs-comment\">\/\/ \u8f93\u51fa\u4e8c\u8fdb\u5236\u6570\u636e<\/span>\r\n            System.out.println(binaryData);\r\n            \r\n            <span class=\"hljs-comment\">\/\/ \u5173\u95edFileInputStream\u548cFileChannel<\/span>\r\n            fis.close();\r\n            channel.close();\r\n            \r\n        } <span class=\"hljs-keyword\">catch<\/span> (IOException e) {\r\n            e.printStackTrace();\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001&#8221;path\/to\/file.jpg&#8221;\u3092\u5b9f\u969b\u306e\u30d5\u30a1\u30a4\u30eb\u30d1\u30b9\u306b\u7f6e\u304d\u63db\u3048\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u30d5\u30a1\u30a4\u30eb\u306e\u30d0\u30a4\u30ca\u30ea\u30c7\u30fc\u30bf\u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067\u306f\u3001\u30d5\u30a1\u30a4\u30eb\u3092\u30d0\u30a4\u30ca\u30ea\u5f62\u5f0f\u306b\u5909\u63db\u3059\u308b\u305f\u3081\u306b\u3001java.io\u30d1\u30c3\u30b1\u30fc\u30b8\u306eFileInputStream\u30af\u30e9\u30b9\u3084java.nio\u30d1\u30c3\u30b1\u30fc\u30b8\u306eByteBuffer\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 \u6700\u521d\u3001FileInp [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-28714","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\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u30d0\u30a4\u30ca\u30ea\u5f62\u5f0f\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f - 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\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u30d0\u30a4\u30ca\u30ea\u5f62\u5f0f\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u306f\u4f55\/\" 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