{"id":668,"date":"2015-05-20T09:39:13","date_gmt":"2015-05-20T01:39:13","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=668"},"modified":"2026-08-18T12:09:33","modified_gmt":"2026-08-18T04:09:33","slug":"java%e4%b8%ad%e6%96%87%e4%bb%b6%e7%9a%84%e9%9a%8f%e6%9c%ba%e8%af%bb%e5%86%99","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=668","title":{"rendered":"Java\u4e2d\u6587\u4ef6\u7684\u968f\u673a\u8bfb\u5199"},"content":{"rendered":"
\n

java.io<\/code> \u5305\u63d0\u4f9b\u4e86 RandomAccessFile<\/strong> \u7c7b\uff0c\u7528\u6765\u521b\u5efa\u548c\u8bbf\u95ee\u968f\u673a\u6587\u4ef6\u3002\u4f7f\u7528\u8fd9\u4e2a\u7c7b\uff0c\u53ef\u4ee5\u8df3\u8f6c\u5230\u6587\u4ef6\u7684\u4efb\u610f\u4f4d\u7f6e\u8bfb\u5199\u6570\u636e\uff1a\u63d2\u5165\u65f6\u4e0d\u5fc5\u7834\u574f\u5176\u4f59\u5185\u5bb9\uff0c\u66f4\u65b0\u6216\u5220\u9664\u5148\u524d\u6570\u636e\u65f6\u4e5f\u4e0d\u5fc5\u91cd\u5199\u6574\u4e2a\u6587\u4ef6\u3002<\/p>\n

<\/p>\n

\u4e00\u3001\u6784\u9020\u65b9\u6cd5<\/h2>\n

RandomAccessFile \u662f Object \u7684\u76f4\u63a5\u5b50\u7c7b\uff0c\u4e3b\u8981\u7528\u4e0b\u9762\u4e24\u4e2a\u6784\u9020\u65b9\u6cd5\u521b\u5efa\u5bf9\u8c61\uff1a<\/p>\n

\"file1\"<\/a><\/p>\n\n\n\n\n\n\n
\u6784\u9020\u65b9\u6cd5<\/th>\n\u8bf4\u660e<\/th>\n<\/tr>\n<\/thead>\n
RandomAccessFile(String name, String mode)<\/td>\n\u6309\u6587\u4ef6\u540d\u6253\u5f00\uff1bmode \u5e38\u7528 “r” \u53ea\u8bfb\u3001”rw” \u8bfb\u5199<\/td>\n<\/tr>\n
RandomAccessFile(File file, String mode)<\/td>\n\u6309 File \u5bf9\u8c61\u6253\u5f00\uff0cmode \u542b\u4e49\u76f8\u540c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u6587\u4ef6\u6307\u9488\u53ef\u4ee5\u7528 seek(long pos)<\/code> \u632a\u5230\u4efb\u610f\u5b57\u8282\u4f4d\u7f6e\uff1blength()<\/code> \u7ed9\u51fa\u5f53\u524d\u6587\u4ef6\u957f\u5ea6\uff0c\u5e38\u7528\u6765\u5b9a\u4f4d\u5230\u672b\u5c3e\u8ffd\u52a0\u3002<\/p>\n

\u4e8c\u3001\u8ffd\u52a0\u5199\u5165\u65e5\u5fd7<\/h2>\n

\u3010\u4f8b 10-12\u3011\u6a21\u4eff\u7cfb\u7edf\u65e5\u5fd7\uff0c\u628a\u952e\u76d8\u8f93\u5165\u5199\u5230\u6587\u4ef6\u5c3e\u90e8\u3002<\/p>\n

import java.io.*;\nclass ep10_12 {\n    public static void main(String args[]) throws IOException {\n        try {\n            BufferedReader in = new BufferedReader(new InputStreamReader(System.in));\n            String s = in.readLine();\n            RandomAccessFile myFile = new RandomAccessFile(\"ep10_12.log\", \"rw\");\n            myFile.seek(myFile.length());  \/\/ \u79fb\u52a8\u5230\u6587\u4ef6\u7ed3\u5c3e\n            myFile.writeBytes(s + \"\\n\");   \/\/ \u5199\u5165\u6570\u636e\n            myFile.close();\n        } catch (IOException e) {}\n    }\n}<\/code><\/pre>\n
\u7a0b\u5e8f\u8fd0\u884c\u540e\u4f1a\u5728\u5f53\u524d\u76ee\u5f55\u5efa\u7acb ep10_12.log<\/code>\u3002\u6bcf\u6b21\u8fd0\u884c\u8f93\u5165\u7684\u5185\u5bb9\u90fd\u4f1a\u8ffd\u52a0\u5230\u6587\u4ef6\u672b\u5c3e\uff0c\u4e0d\u4f1a\u8986\u76d6\u5df2\u6709\u8bb0\u5f55\u3002<\/p>\n
\n
\u4e00\u53e5\u8bdd\u603b\u7ed3\uff1aRandomAccessFile \u9760\u6587\u4ef6\u6307\u9488\u968f\u673a\u5b9a\u4f4d\uff1bseek(length()) \u5c31\u80fd\u5728\u5c3e\u90e8\u8ffd\u52a0\uff0c\u4e0d\u5fc5\u91cd\u5199\u6574\u6587\u4ef6\u3002<\/strong><\/p>\n<\/blockquote>\n<\/section>\n","protected":false},"excerpt":{"rendered":"
java.io \u5305\u63d0\u4f9b\u4e86 RandomAccessFile \u7c7b\uff0c\u7528\u6765\u521b\u5efa\u548c\u8bbf\u95ee\u968f\u673a\u6587\u4ef6\u3002\u4f7f\u7528\u8fd9\u4e2a\u7c7b\uff0c\u53ef\u4ee5\u8df3\u8f6c\u5230 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[22],"tags":[41],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/668"}],"collection":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=668"}],"version-history":[{"count":2,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/668\/revisions"}],"predecessor-version":[{"id":671,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/668\/revisions\/671"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=668"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=668"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=668"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}