{"id":106126,"date":"2024-03-22T10:46:47","date_gmt":"2024-03-22T01:46:47","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%81%8c%e4%bd%bf%e7%94%a8%e4%b8%ad%e3%81%a7%e3%81%82%e3%82%8b%e3%81%8b%e3%81%a9%e3%81%86%e3%81%8b%e3%82%92java%e3%81%a7%e5%88%a4%e5%ae%9a%e3%81%99%e3%82%8b\/"},"modified":"2024-03-26T23:45:46","modified_gmt":"2024-03-26T14:45:46","slug":"%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%81%8c%e4%bd%bf%e7%94%a8%e4%b8%ad%e3%81%a7%e3%81%82%e3%82%8b%e3%81%8b%e3%81%a9%e3%81%86%e3%81%8b%e3%82%92java%e3%81%a7%e5%88%a4%e5%ae%9a%e3%81%99%e3%82%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%81%8c%e4%bd%bf%e7%94%a8%e4%b8%ad%e3%81%a7%e3%81%82%e3%82%8b%e3%81%8b%e3%81%a9%e3%81%86%e3%81%8b%e3%82%92java%e3%81%a7%e5%88%a4%e5%ae%9a%e3%81%99%e3%82%8b\/","title":{"rendered":"\u30d5\u30a1\u30a4\u30eb\u304c\u4f7f\u7528\u4e2d\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092Java\u3067\u5224\u5b9a\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p>Java\u3067\u30d5\u30a1\u30a4\u30eb\u304c\u30ed\u30c3\u30af\u3055\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<ol>\n<li>FileChannel<\/li>\n<li>tryLock()<\/li>\n<li>tryLock()<\/li>\n<li>\u305d\u306e\u6587\u7ae0\u3092\u65e5\u672c\u8a9e\u306b\u81ea\u7136\u306b\u8a00\u3044\u63db\u3048\u3066\u304f\u3060\u3055\u3044\u3002\u30aa\u30d7\u30b7\u30e7\u30f3\u306f 1 \u3064\u3060\u3051\u3067\u304b\u307e\u3044\u307e\u305b\u3093\u3002<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><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>(<span class=\"hljs-string\">\"path\/to\/file\"<\/span>);\r\n<span class=\"hljs-type\">FileChannel<\/span> <span class=\"hljs-variable\">channel<\/span> <span class=\"hljs-operator\">=<\/span> FileChannel.open(file.toPath(), StandardOpenOption.WRITE);\r\n<span class=\"hljs-type\">FileLock<\/span> <span class=\"hljs-variable\">lock<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-literal\">null<\/span>;\r\n\r\n<span class=\"hljs-keyword\">try<\/span> {\r\n    lock = channel.tryLock();\r\n    <span class=\"hljs-keyword\">if<\/span> (lock != <span class=\"hljs-literal\">null<\/span>) {\r\n        <span class=\"hljs-comment\">\/\/ \u6587\u4ef6\u672a\u88ab\u5360\u7528<\/span>\r\n        System.out.println(<span class=\"hljs-string\">\"File is not locked\"<\/span>);\r\n    } <span class=\"hljs-keyword\">else<\/span> {\r\n        <span class=\"hljs-comment\">\/\/ \u6587\u4ef6\u88ab\u5360\u7528<\/span>\r\n        System.out.println(<span class=\"hljs-string\">\"File is locked\"<\/span>);\r\n    }\r\n} <span class=\"hljs-keyword\">catch<\/span> (IOException e) {\r\n    e.printStackTrace();\r\n} <span class=\"hljs-keyword\">finally<\/span> {\r\n    <span class=\"hljs-keyword\">if<\/span> (lock != <span class=\"hljs-literal\">null<\/span>) {\r\n        <span class=\"hljs-keyword\">try<\/span> {\r\n            lock.release();\r\n        } <span class=\"hljs-keyword\">catch<\/span> (IOException e) {\r\n            e.printStackTrace();\r\n        }\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">try<\/span> {\r\n        channel.close();\r\n    } <span class=\"hljs-keyword\">catch<\/span> (IOException e) {\r\n        e.printStackTrace();\r\n    }\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>java.nio.channels.FileChannel<\/li>\n<li>\u30ed\u30c3\u30af\u3057\u307e\u3059<\/li>\n<li>\u30d6\u30ed\u30c3\u30af<\/li>\n<li>false<\/li>\n<li>\u30ed\u30c3\u30af<\/li>\n<li>\u30aa\u30fc\u30d0\u30fc\u30e9\u30c3\u30d4\u30f3\u30b0\u30d5\u30a1\u30a4\u30eb\u30ed\u30c3\u30af\u4f8b\u5916<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><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>(<span class=\"hljs-string\">\"path\/to\/file\"<\/span>);\r\n<span class=\"hljs-type\">FileChannel<\/span> <span class=\"hljs-variable\">channel<\/span> <span class=\"hljs-operator\">=<\/span> FileChannel.open(file.toPath(), StandardOpenOption.WRITE);\r\n<span class=\"hljs-type\">FileLock<\/span> <span class=\"hljs-variable\">lock<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-literal\">null<\/span>;\r\n\r\n<span class=\"hljs-keyword\">try<\/span> {\r\n    lock = channel.lock(<span class=\"hljs-number\">0L<\/span>, Long.MAX_VALUE, <span class=\"hljs-literal\">false<\/span>);\r\n    <span class=\"hljs-comment\">\/\/ \u6587\u4ef6\u672a\u88ab\u5360\u7528<\/span>\r\n    System.out.println(<span class=\"hljs-string\">\"File is not locked\"<\/span>);\r\n} <span class=\"hljs-keyword\">catch<\/span> (OverlappingFileLockException e) {\r\n    <span class=\"hljs-comment\">\/\/ \u6587\u4ef6\u88ab\u5360\u7528<\/span>\r\n    System.out.println(<span class=\"hljs-string\">\"File is locked\"<\/span>);\r\n} <span class=\"hljs-keyword\">catch<\/span> (IOException e) {\r\n    e.printStackTrace();\r\n} <span class=\"hljs-keyword\">finally<\/span> {\r\n    <span class=\"hljs-keyword\">if<\/span> (lock != <span class=\"hljs-literal\">null<\/span>) {\r\n        <span class=\"hljs-keyword\">try<\/span> {\r\n            lock.release();\r\n        } <span class=\"hljs-keyword\">catch<\/span> (IOException e) {\r\n            e.printStackTrace();\r\n        }\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">try<\/span> {\r\n        channel.close();\r\n    } <span class=\"hljs-keyword\">catch<\/span> (IOException e) {\r\n        e.printStackTrace();\r\n    }\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>Java.nio.file.Files API<\/li>\n<li>\u8aad\u307f\u53d6\u308a\u53ef\u80fd\u304b\u3069\u3046\u304b\u3092\u793a\u3059<\/li>\n<li>\u66f8\u304d\u8fbc\u307f\u53ef\u80fd\u304b\uff1f<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><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>(<span class=\"hljs-string\">\"path\/to\/file\"<\/span>);\r\n\r\n<span class=\"hljs-keyword\">if<\/span> (!Files.isReadable(file) || !Files.isWritable(file)) {\r\n    <span class=\"hljs-comment\">\/\/ \u6587\u4ef6\u88ab\u5360\u7528<\/span>\r\n    System.out.println(<span class=\"hljs-string\">\"File is locked\"<\/span>);\r\n} <span class=\"hljs-keyword\">else<\/span> {\r\n    <span class=\"hljs-comment\">\/\/ \u6587\u4ef6\u672a\u88ab\u5360\u7528<\/span>\r\n    System.out.println(<span class=\"hljs-string\">\"File is not locked\"<\/span>);\r\n}\r\n<\/code><\/pre>\n<p>\u306a\u304a\u3001\u3053\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u4ed6\u306e\u30d7\u30ed\u30bb\u30b9\u307e\u305f\u306f\u30b9\u30ec\u30c3\u30c9\u306b\u30d5\u30a1\u30a4\u30eb\u304c\u5360\u6709\u3055\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3059\u308b\u3060\u3051\u3067\u3001\u4ed6\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u5360\u6709\u3055\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3059\u308b\u3082\u306e\u3067\u306f\u306a\u3044\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067\u30d5\u30a1\u30a4\u30eb\u304c\u30ed\u30c3\u30af\u3055\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002 FileChannel tryLock() tryLock() \u305d\u306e\u6587\u7ae0\u3092\u65e5\u672c\u8a9e\u306b\u81ea\u7136\u306b\u8a00\u3044\u63db\u3048\u3066\u304f\u3060\u3055\u3044\u3002\u30aa\u30d7\u30b7\u30e7\u30f3\u306f 1 \u3064\u3060\u3051\u3067\u304b\u307e [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-106126","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>\u30d5\u30a1\u30a4\u30eb\u304c\u4f7f\u7528\u4e2d\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092Java\u3067\u5224\u5b9a\u3059\u308b\u65b9\u6cd5 - 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\/\u30d5\u30a1\u30a4\u30eb\u304c\u4f7f\u7528\u4e2d\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092java\u3067\u5224\u5b9a\u3059\u308b\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u30d5\u30a1\u30a4\u30eb\u304c\u4f7f\u7528\u4e2d\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092Java\u3067\u5224\u5b9a\u3059\u308b\u65b9\u6cd5\" \/>\n<meta property=\"og:description\" content=\"Java\u3067\u30d5\u30a1\u30a4\u30eb\u304c\u30ed\u30c3\u30af\u3055\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002 FileChannel tryLock() tryLock() \u305d\u306e\u6587\u7ae0\u3092\u65e5\u672c\u8a9e\u306b\u81ea\u7136\u306b\u8a00\u3044\u63db\u3048\u3066\u304f\u3060\u3055\u3044\u3002\u30aa\u30d7\u30b7\u30e7\u30f3\u306f 1 \u3064\u3060\u3051\u3067\u304b\u307e [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/\u30d5\u30a1\u30a4\u30eb\u304c\u4f7f\u7528\u4e2d\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092java\u3067\u5224\u5b9a\u3059\u308b\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-22T01:46:47+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-26T14:45:46+00:00\" \/>\n<meta name=\"author\" content=\"\u685c, \u6625\u6a39\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u685c, \u6625\u6a39\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593\" \/>\n\t<meta name=\"twitter:data2\" content=\"1\u5206\" \/>\n<script type=\"application\/ld+json\" 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