{"id":746,"date":"2023-05-12T07:02:47","date_gmt":"2023-12-09T05:12:03","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java-randomaccessfile-%e7%a4%ba%e4%be%8b\/"},"modified":"2025-08-03T06:00:31","modified_gmt":"2025-08-02T22:00:31","slug":"java-randomaccessfile-%e7%a4%ba%e4%be%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-randomaccessfile-%e7%a4%ba%e4%be%8b\/","title":{"rendered":"Java RandomAccessFile\u6559\u7a0b\uff1a\u5b9e\u7528\u793a\u4f8b\u4e0e\u6700\u4f73\u5b9e\u8df5\u8be6\u89e3"},"content":{"rendered":"<p>Java\u7684RandomAccessFile\u63d0\u4f9b\u4e86\u8bfb\u5199\u6587\u4ef6\u6570\u636e\u7684\u529f\u80fd\u3002RandomAccessFile\u5c06\u6587\u4ef6\u89c6\u4e3a\u5b58\u50a8\u5728\u6587\u4ef6\u7cfb\u7edf\u4e2d\u7684\u5b57\u8282\u6570\u7ec4\uff0c\u5e76\u4f7f\u7528\u5149\u6807\u6765\u79fb\u52a8\u6587\u4ef6\u6307\u9488\u4f4d\u7f6e\u3002<\/p>\n<h2>\u4f7f\u7528Java\u7684RandomAccessFile\u7c7b<\/h2>\n<div><img decoding=\"async\" class=\"post-images\" title=\"Java RandomAccessFile\u793a\u4f8b\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65648429a4b2f92e6c72f9ec\/2-0.jpg\" alt=\"Java RandomAccessFile, Java\u4e2d\u7684RandomAccessFile, Java RandomAccessFile\u8bfb\u5199\u8ffd\u52a0\u793a\u4f8b\" \/><\/div>\n<h3>Java\u968f\u673a\u8bbf\u95ee\u6587\u4ef6\u7684\u8bfb\u53d6\u793a\u4f8b<\/h3>\n<p>\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528Java\u4e2d\u7684RandomAccessFile\u4ece\u6587\u4ef6\u4e2d\u8bfb\u53d6\u5b57\u8282\u6570\u7ec4\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528RandomAccessFile\u8bfb\u53d6\u6587\u4ef6\u7684\u793a\u4f8b\u4ee3\u7801\u3002<\/p>\n<pre class=\"post-pre\"><code>RandomAccessFile raf = new RandomAccessFile(\"file.txt\", \"r\");\r\nraf.seek(1);\r\nbyte[] bytes = new byte[5];\r\nraf.read(bytes);\r\nraf.close();\r\nSystem.out.println(new String(bytes));\r\n<\/code><\/pre>\n<p>\u5728\u7b2c\u4e00\u884c\u4e2d\uff0c\u6211\u4eec\u4ee5\u53ea\u8bfb\u6a21\u5f0f\u4e3a\u6587\u4ef6\u521b\u5efaRandomAccessFile\u5b9e\u4f8b\u3002\u7136\u540e\u5728\u7b2c\u4e8c\u884c\u4e2d\uff0c\u6211\u4eec\u5c06\u6587\u4ef6\u6307\u9488\u79fb\u52a8\u5230\u7d22\u5f151\u7684\u4f4d\u7f6e\u3002\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u957f\u5ea6\u4e3a5\u7684\u5b57\u8282\u6570\u7ec4\uff0c\u6240\u4ee5\u5f53\u6211\u4eec\u8c03\u7528read(bytes)\u65b9\u6cd5\u65f6\uff0c\u4f1a\u5c065\u4e2a\u5b57\u8282\u4ece\u6587\u4ef6\u4e2d\u8bfb\u53d6\u5230\u5b57\u8282\u6570\u7ec4\u4e2d\u3002\u6700\u540e\uff0c\u6211\u4eec\u5173\u95edRandomAccessFile\u8d44\u6e90\u5e76\u5c06\u5b57\u8282\u6570\u7ec4\u6253\u5370\u5230\u63a7\u5236\u53f0\u4e0a\u3002<\/p>\n<h3>Java RandomAccessFile\u5199\u5165\u793a\u4f8b<\/h3>\n<p>\u8fd9\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528Java\u4e2d\u7684RandomAccessFile\u5c06\u6570\u636e\u5199\u5165\u6587\u4ef6\u3002<\/p>\n<pre class=\"post-pre\"><code>RandomAccessFile raf = new RandomAccessFile(\"file.txt\", \"rw\");\r\nraf.seek(5);\r\nraf.write(\"Data\".getBytes());\r\nraf.close();\r\n<\/code><\/pre>\n<p>\u7531\u4e8eRandomAccessFile\u5c06\u6587\u4ef6\u89c6\u4e3a\u5b57\u8282\u6570\u7ec4\uff0c\u5199\u64cd\u4f5c\u65e2\u53ef\u4ee5\u8986\u76d6\u6570\u636e\uff0c\u4e5f\u53ef\u4ee5\u5411\u6587\u4ef6\u8ffd\u52a0\u5185\u5bb9\u3002\u8fd9\u5b8c\u5168\u53d6\u51b3\u4e8e\u6587\u4ef6\u6307\u9488\u7684\u4f4d\u7f6e\u3002\u5982\u679c\u5c06\u6307\u9488\u79fb\u52a8\u5230\u8d85\u51fa\u6587\u4ef6\u957f\u5ea6\u7684\u4f4d\u7f6e\uff0c\u5e76\u8fdb\u884c\u5199\u64cd\u4f5c\uff0c\u90a3\u4e48\u6587\u4ef6\u4e2d\u5c06\u5199\u5165\u65e0\u7528\u6570\u636e\u3002\u56e0\u6b64\uff0c\u5728\u4f7f\u7528\u5199\u64cd\u4f5c\u65f6\u9700\u8981\u6ce8\u610f\u8fd9\u4e00\u70b9\u3002<\/p>\n<h3>\u968f\u673a\u8bbf\u95ee\u6587\u4ef6\u8ffd\u52a0\u793a\u4f8b<\/h3>\n<p>\u6211\u4eec\u53ea\u9700\u8981\u786e\u4fdd\u6587\u4ef6\u6307\u9488\u4f4d\u4e8e\u6587\u4ef6\u672b\u5c3e\uff0c\u5c31\u53ef\u4ee5\u5411\u6587\u4ef6\u8ffd\u52a0\u5185\u5bb9\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528RandomAccessFile\u8ffd\u52a0\u5230\u6587\u4ef6\u7684\u4ee3\u7801\u3002<\/p>\n<pre class=\"post-pre\"><code>RandomAccessFile raf = new RandomAccessFile(\"file.txt\", \"rw\");\r\nraf.seek(raf.length());\r\nraf.write(\"Data\".getBytes());\r\nraf.close();\r\n<\/code><\/pre>\n<h3>Java RandomAccessFile\u5b8c\u6574\u793a\u4f8b<\/h3>\n<p>\u8fd9\u662f\u4e00\u4e2a\u5b8c\u6574\u7684Java RandomAccessFile\u793a\u4f8b\uff0c\u5305\u542b\u4e86\u4e0d\u540c\u7684\u8bfb\u53d6\u548c\u5199\u5165\u64cd\u4f5c\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.files;\r\n\r\nimport java.io.IOException;\r\nimport java.io.RandomAccessFile;\r\n\r\npublic class RandomAccessFileExample {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\ttry {\r\n\t\t\t\/\/ \u6587\u4ef6\u5185\u5bb9\u4e3a \"ABCDEFGH\"\r\n\t\t\tString filePath = \"\/Users\/scdev\/Downloads\/source.txt\"; \r\n\t\t\t\r\n\t\t\tSystem.out.println(new String(readCharsFromFile(filePath, 1, 5)));\r\n\r\n\t\t\twriteData(filePath, \"Data\", 5);\r\n\t\t\t\/\/ \u73b0\u5728\u6587\u4ef6\u5185\u5bb9\u4e3a \"ABCDEData\"\r\n\t\t\t\r\n\t\t\tappendData(filePath, \"scdev\");\r\n\t\t\t\/\/ \u73b0\u5728\u6587\u4ef6\u5185\u5bb9\u4e3a \"ABCDEDatascdev\"\r\n\t\t} catch (IOException e) {\r\n\t\t\te.printStackTrace();\r\n\t\t}\r\n\t}\r\n\r\n\tprivate static void appendData(String filePath, String data) throws IOException {\r\n\t\tRandomAccessFile raFile = new RandomAccessFile(filePath, \"rw\");\r\n\t\traFile.seek(raFile.length());\r\n\t\tSystem.out.println(\"\u5f53\u524d\u6307\u9488\u4f4d\u7f6e = \"+raFile.getFilePointer());\r\n\t\traFile.write(data.getBytes());\r\n\t\traFile.close();\r\n\t\t\r\n\t}\r\n\r\n\tprivate static void writeData(String filePath, String data, int seek) throws IOException {\r\n\t\tRandomAccessFile file = new RandomAccessFile(filePath, \"rw\");\r\n\t\tfile.seek(seek);\r\n\t\tfile.write(data.getBytes());\r\n\t\tfile.close();\r\n\t}\r\n\r\n\tprivate static byte[] readCharsFromFile(String filePath, int seek, int chars) throws IOException {\r\n\t\tRandomAccessFile file = new RandomAccessFile(filePath, \"r\");\r\n\t\tfile.seek(seek);\r\n\t\tbyte[] bytes = new byte[chars];\r\n\t\tfile.read(bytes);\r\n\t\tfile.close();\r\n\t\treturn bytes;\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u5173\u4e8eJava\u4e2d\u7684RandomAccessFile\u7684\u4ecb\u7ecd\u5c31\u5230\u8fd9\u91cc\u4e86\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u7684RandomAccessFile\u63d0\u4f9b\u4e86\u8bfb\u5199\u6587\u4ef6\u6570\u636e\u7684\u529f\u80fd\u3002RandomAccessFile\u5c06\u6587\u4ef6\u89c6\u4e3a [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[2033,2032,967,180,2034],"class_list":{"0":"post-746","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"tag-java-io","8":"tag-java-randomaccessfile","9":"tag-java","11":"tag-2034"},"yoast_head":"<!-- This site is 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