{"id":785,"date":"2023-02-25T17:31:28","date_gmt":"2023-03-07T13:10:44","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/%e7%94%a8java%e8%8e%b7%e5%8f%96%e6%96%87%e4%bb%b6%e5%a4%a7%e5%b0%8f\/"},"modified":"2025-08-03T07:45:19","modified_gmt":"2025-08-02T23:45:19","slug":"%e7%94%a8java%e8%8e%b7%e5%8f%96%e6%96%87%e4%bb%b6%e5%a4%a7%e5%b0%8f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e7%94%a8java%e8%8e%b7%e5%8f%96%e6%96%87%e4%bb%b6%e5%a4%a7%e5%b0%8f\/","title":{"rendered":"Java\u83b7\u53d6\u6587\u4ef6\u5927\u5c0f\u7684\u5b8c\u6574\u6559\u7a0b\uff1a5\u79cd\u65b9\u6cd5\u4e0e\u4ee3\u7801\u793a\u4f8b"},"content":{"rendered":"<h2>Java\u83b7\u53d6\u6587\u4ef6\u5927\u5c0f<\/h2>\n<p>\u4eca\u5929\u6211\u4eec\u5c06\u7814\u7a76\u5728Java\u4e2d\u83b7\u53d6\u6587\u4ef6\u5927\u5c0f\u7684\u4e0d\u540c\u65b9\u6cd5\u3002\u5728Java\u4e2d\uff0c\u6709\u591a\u79cd\u7c7b\u53ef\u4ee5\u7528\u4e8e\u83b7\u53d6\u6587\u4ef6\u5927\u5c0f\u7684\u7a0b\u5e8f\u3002\u5176\u4e2d\u4e00\u4e9b\u7c7b\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528File\u7c7b\u6765\u83b7\u53d6Java\u4e2d\u7684\u6587\u4ef6\u5927\u5c0f<\/li>\n<li>\u4f7f\u7528FileChannel\u7c7b\u5728Java\u4e2d\u83b7\u53d6\u6587\u4ef6\u5927\u5c0f<\/li>\n<li>\u4f7f\u7528Apache Commons IO FileUtils\u7c7b\u6765\u83b7\u53d6Java\u4e2d\u7684\u6587\u4ef6\u5927\u5c0f<\/li>\n<\/ul>\n<div><img decoding=\"async\" class=\"post-images\" title=\"Java\u83b7\u53d6\u6587\u4ef6\u5927\u5c0f\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/6564846ca4b2f92e6c72fc15\/4-0.png\" alt=\"Java\u6587\u4ef6\u5927\u5c0f\uff0cJava\u83b7\u53d6\u6587\u4ef6\u5927\u5c0f\" \/><\/div>\n<h3>\u4f7f\u7528File\u7c7b\u83b7\u53d6Java\u6587\u4ef6\u5927\u5c0f<\/h3>\n<p>Java\u7684File.length()\u65b9\u6cd5\u8fd4\u56de\u6587\u4ef6\u5927\u5c0f\uff08\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d\uff09\u3002\u5982\u679c\u6b64\u6587\u4ef6\u4ee3\u8868\u4e00\u4e2a\u76ee\u5f55\uff0c\u5219\u8fd4\u56de\u503c\u662f\u672a\u6307\u5b9a\u7684\u3002\u56e0\u6b64\uff0c\u5728\u8c03\u7528\u6b64\u65b9\u6cd5\u83b7\u53d6Java\u4e2d\u7684\u6587\u4ef6\u5927\u5c0f\u4e4b\u524d\uff0c\u8bf7\u786e\u4fdd\u6587\u4ef6\u5b58\u5728\u4e14\u4e0d\u662f\u4e00\u4e2a\u76ee\u5f55\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528File\u7c7b\u7684\u7b80\u5355Java\u83b7\u53d6\u6587\u4ef6\u5927\u5c0f\u7684\u793a\u4f8b\u7a0b\u5e8f\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.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) + \" \u5146\u5b57\u8282\";\r\n\t}\r\n\t\r\n\tprivate static String getFileSizeKiloBytes(File file) {\r\n\t\treturn (double) file.length() \/ 1024 + \" \u5343\u5b57\u8282\";\r\n\t}\r\n\r\n\tprivate static String getFileSizeBytes(File file) {\r\n\t\treturn file.length() + \" \u5b57\u8282\";\r\n\t}\r\n}\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"Java\u83b7\u53d6\u6587\u4ef6\u5927\u5c0f\u793a\u4f8b\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/6564846ca4b2f92e6c72fc15\/8-0.png\" alt=\"Java\u83b7\u53d6\u6587\u4ef6\u5927\u5c0f\" \/><\/div>\n<h3>\u4f7f\u7528FileChannel\u7c7b\u5728Java\u4e2d\u83b7\u53d6\u6587\u4ef6\u5927\u5c0f<\/h3>\n<p>\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528FileChannel\u7684size()\u65b9\u6cd5\u83b7\u53d6\u6587\u4ef6\u5927\u5c0f\uff08\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.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 + \" \u5b57\u8282\");\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<h3>\u4f7f\u7528Apache Commons IO FileUtils\u7c7b\u6765\u83b7\u53d6Java\u4e2d\u7684\u6587\u4ef6\u5927\u5c0f<\/h3>\n<p>\u5982\u679c\u60a8\u7684\u9879\u76ee\u5df2\u7ecf\u5728\u4f7f\u7528Apache Commons IO\uff0c\u90a3\u4e48\u60a8\u53ef\u4ee5\u4f7f\u7528FileUtils\u7684sizeOf\u65b9\u6cd5\u6765\u83b7\u53d6\u6587\u4ef6\u5927\u5c0f\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.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 + \" \u5b57\u8282\");\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0a\u5c31\u662f\u5173\u4e8eJava\u83b7\u53d6\u6587\u4ef6\u5927\u5c0f\u7a0b\u5e8f\u7684\u5168\u90e8\u5185\u5bb9\u3002\u60a8\u53ef\u4ee5\u4ece\u6211\u4eec\u7684GitHub\u4ed3\u5e93\u4e2d\u67e5\u770b\u66f4\u591a\u7684Java IO\u793a\u4f8b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u83b7\u53d6\u6587\u4ef6\u5927\u5c0f \u4eca\u5929\u6211\u4eec\u5c06\u7814\u7a76\u5728Java\u4e2d\u83b7\u53d6\u6587\u4ef6\u5927\u5c0f\u7684\u4e0d\u540c\u65b9\u6cd5\u3002\u5728Java\u4e2d\uff0c\u6709\u591a\u79cd\u7c7b\u53ef\u4ee5\u7528\u4e8e\u83b7\u53d6\u6587\u4ef6 [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[189,1241,180,820,960],"class_list":{"0":"post-785","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"tag-java","8":"tag-java-io","10":"tag-820","11":"tag-960"},"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\u83b7\u53d6\u6587\u4ef6\u5927\u5c0f\u7684\u5b8c\u6574\u6559\u7a0b\uff1a5\u79cd\u65b9\u6cd5\u4e0e\u4ee3\u7801\u793a\u4f8b - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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