{"id":679,"date":"2023-07-21T01:54:25","date_gmt":"2022-07-09T15:12:54","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java%e3%81%a7%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%81%ae%e3%82%b5%e3%82%a4%e3%82%ba%e3%82%92%e5%8f%96%e5%be%97%e3%81%99%e3%82%8b\/"},"modified":"2025-08-01T01:36:05","modified_gmt":"2025-07-31T16:36:05","slug":"java%e3%81%a7%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%81%ae%e3%82%b5%e3%82%a4%e3%82%ba%e3%82%92%e5%8f%96%e5%be%97%e3%81%99%e3%82%8b","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%81%ae%e3%82%b5%e3%82%a4%e3%82%ba%e3%82%92%e5%8f%96%e5%be%97%e3%81%99%e3%82%8b\/","title":{"rendered":"Java\u3067\u30d5\u30a1\u30a4\u30eb\u306e\u30b5\u30a4\u30ba\u3092\u53d6\u5f97\u3059\u308b"},"content":{"rendered":"

\u4eca\u65e5\u306f\u3001Java\u3067\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u53d6\u5f97\u3059\u308b\u3055\u307e\u3056\u307e\u306a\u65b9\u6cd5\u3092\u8abf\u3079\u307e\u3059\u3002<\/p>\n

Java\u3067\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u53d6\u5f97\u3059\u308b<\/h2>\n

Java\u306e\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u4f7f\u7528\u3067\u304d\u308b\u3055\u307e\u3056\u307e\u306a\u30af\u30e9\u30b9\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u4e2d\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

    \n
  1. \n
      Java\u306eFile\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u53d6\u5f97\u3059\u308b<\/ol>\n<\/li>\n<\/ol>\n

       <\/p>\n

        \n
      1. \n
          FileChannel\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066Java\u3067\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u53d6\u5f97\u3059\u308b<\/ol>\n<\/li>\n<\/ol>\n

           <\/p>\n

            Apache Commons IO FileUtils\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066Java\u3067\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u53d6\u5f97\u3059\u308b<\/ol>\n
            \"java<\/div>\n

            File\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u3001Java\u3067\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u53d6\u5f97\u3059\u308b\u3002<\/h3>\n

            Java\u306eFile\u306elength()\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30d5\u30a1\u30a4\u30eb\u306e\u30b5\u30a4\u30ba\u3092\u30d0\u30a4\u30c8\u5358\u4f4d\u3067\u8fd4\u3057\u307e\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u306f\u3001\u3053\u306e\u30d5\u30a1\u30a4\u30eb\u304c\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3092\u793a\u3059\u5834\u5408\u306b\u306f\u672a\u6307\u5b9a\u3067\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001Java\u3067\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u524d\u306b\u3001\u30d5\u30a1\u30a4\u30eb\u304c\u5b58\u5728\u3057\u3001\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3067\u306f\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u4ee5\u4e0b\u306f\u3001File\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u305f\u5358\u7d14\u306aJava\u306e\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u53d6\u5f97\u306e\u4f8b\u3067\u3059\u3002<\/p>\n

            package com.scdev.getfilesize;\r\n\r\nimport java.io.File;\r\n\r\npublic class JavaGetFileSize {\r\n\r\n\tstatic final String FILE_NAME = \"\/Users\/scdev\/Downloads\/file.pdf\";\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tFile file = new File(FILE_NAME);\r\n\t\tif (!file.exists() || !file.isFile()) return;\r\n\r\n\t\tSystem.out.println(getFileSizeBytes(file));\r\n\t\tSystem.out.println(getFileSizeKiloBytes(file));\r\n\t\tSystem.out.println(getFileSizeMegaBytes(file));\r\n\t}\r\n\r\n\tprivate static String getFileSizeMegaBytes(File file) {\r\n\t\treturn (double) file.length() \/ (1024 * 1024) + \" mb\";\r\n\t}\r\n\t\r\n\tprivate static String getFileSizeKiloBytes(File file) {\r\n\t\treturn (double) file.length() \/ 1024 + \"  kb\";\r\n\t}\r\n\r\n\tprivate static String getFileSizeBytes(File file) {\r\n\t\treturn file.length() + \" bytes\";\r\n\t}\r\n}\r\n<\/code><\/pre>\n
            \"java<\/div>\n
            Java\u306eFileChannel\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u3001\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u53d6\u5f97\u3059\u308b\u3002<\/h3>\n
            \u79c1\u305f\u3061\u306fFileChannel\u306esize ()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u3001\u30d5\u30a1\u30a4\u30eb\u306e\u30b5\u30a4\u30ba\u3092\u30d0\u30a4\u30c8\u5358\u4f4d\u3067\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
            package com.scdev.getfilesize;\r\n\r\nimport java.io.IOException;\r\nimport java.nio.channels.FileChannel;\r\nimport java.nio.file.Path;\r\nimport java.nio.file.Paths;\r\n\r\npublic class JavaGetFileSizeUsingFileChannel {\r\n\r\n\tstatic final String FILE_NAME = \"\/Users\/scdev\/Downloads\/file.pdf\";\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t\tPath filePath = Paths.get(FILE_NAME);\r\n\t\tFileChannel fileChannel;\r\n\t\ttry {\r\n\t\t\tfileChannel = FileChannel.open(filePath);\r\n\t\t\tlong fileSize = fileChannel.size();\r\n\t\t\tSystem.out.println(fileSize + \" bytes\");\r\n\t\t\tfileChannel.close();\r\n\t\t} catch (IOException e) {\r\n\t\t\te.printStackTrace();\r\n\t\t}\r\n\t}\r\n}\r\n<\/code><\/pre>\n
            Apache Commons IO FileUtils\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u3001Java\u3067\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002<\/h3>\n
            \u3082\u3057\u3059\u3067\u306b\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067Apache Commons IO\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001Java\u3067\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306bFileUtils\u306esizeOf\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
            package com.scdev.getfilesize;\r\n\r\nimport java.io.File;\r\n\r\nimport org.apache.commons.io.FileUtils;\r\n\r\npublic class JavaGetFileSizeUsingApacheCommonsIO {\r\n\r\n\tstatic final String FILE_NAME = \"\/Users\/scdev\/Downloads\/file.pdf\";\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tFile file = new File(FILE_NAME);\r\n\r\n\t\tlong fileSize = FileUtils.sizeOf(file);\r\n\r\n\t\tSystem.out.println(fileSize + \" bytes\");\r\n\t}\r\n}\r\n<\/code><\/pre>\n
            \u3053\u308c\u3067\u3001Java\u306e\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u4ee5\u4e0a\u3067\u3059\u3002<\/p>\n
            \u79c1\u305f\u3061\u306eGitHub\u30ea\u30dd\u30b8\u30c8\u30ea\u304b\u3089\u3001\u3055\u3089\u306b\u591a\u304f\u306eJava IO\u306e\u4f8b\u3092\u30c1\u30a7\u30c3\u30af\u30a2\u30a6\u30c8\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
            \u4eca\u65e5\u306f\u3001Java\u3067\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u53d6\u5f97\u3059\u308b\u3055\u307e\u3056\u307e\u306a\u65b9\u6cd5\u3092\u8abf\u3079\u307e\u3059\u3002 Java\u3067\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u53d6\u5f97\u3059\u308b Java\u306e\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u4f7f\u7528\u3067\u304d\u308b\u3055\u307e\u3056\u307e\u306a\u30af\u30e9\u30b9\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u4e2d\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002 Ja […]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-679","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"\nJava\u3067\u30d5\u30a1\u30a4\u30eb\u306e\u30b5\u30a4\u30ba\u3092\u53d6\u5f97\u3059\u308b - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Java\u3067\u30d5\u30a1\u30a4\u30eb\u306e\u30b5\u30a4\u30ba\u3092\u53d6\u5f97\u3059\u308b\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\u3002\" \/>\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\u306e\u30b5\u30a4\u30ba\u3092\u53d6\u5f97\u3059\u308b\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u3067\u30d5\u30a1\u30a4\u30eb\u306e\u30b5\u30a4\u30ba\u3092\u53d6\u5f97\u3059\u308b\" \/>\n<meta property=\"og:description\" content=\"Java\u3067\u30d5\u30a1\u30a4\u30eb\u306e\u30b5\u30a4\u30ba\u3092\u53d6\u5f97\u3059\u308b\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u3067\u30d5\u30a1\u30a4\u30eb\u306e\u30b5\u30a4\u30ba\u3092\u53d6\u5f97\u3059\u308b\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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