{"id":939,"date":"2018-09-17T18:39:34","date_gmt":"2018-09-17T09:39:34","guid":{"rendered":"https:\/\/chat-messenger.com\/?p=939"},"modified":"2018-12-23T01:53:23","modified_gmt":"2018-12-22T16:53:23","slug":"dateikanalubertragung-an","status":"publish","type":"post","link":"https:\/\/chat-messenger.com\/de\/blog\/java\/filechannel-transferto","title":{"rendered":"Java-Dateikopie (einfach und schnell)"},"content":{"rendered":"<h2 class=\"common_title\"><a name=\"0\">Java \u30d5\u30a1\u30a4\u30eb\u30b3\u30d4\u30fc\uff08\u7c21\u5358\u30fb\u9ad8\u901f\uff09<\/a>FileChannel#transferTo<\/h2>\n<p>\n\u3000Java \u3067<strong>\u30d5\u30a1\u30a4\u30eb\u3092\u30b3\u30d4\u30fc<\/strong>\u3059\u308b\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<br \/>\n\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u3001J2SE1.4 \u3067\u5c0e\u5165\u3055\u308c\u305f New I\/O \u306e <strong>java.nio.channels.FileChannel#transferTo<\/strong> \u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3057\u307e\u3059\u3002<br \/>\n\u30c7\u30fc\u30bf\u306e\u8aad\u307f\u8fbc\u307f\u306b\u5fc5\u8981\u306a\u30d0\u30c3\u30d5\u30a1\u3092\u610f\u8b58\u3059\u308b\u3053\u3068\u7121\u304f\u3001\u30b3\u30d4\u30fc\u51e6\u7406\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u8a18\u8ff0\u3067\u304d\u3001\u6700\u3082\u30b7\u30f3\u30d7\u30eb\u306a\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3068\u306a\u308a\u307e\u3059\u3002\n<\/p>\n<h2 class=\"common_title\"><a name=\"1\">\u30c1\u30e3\u30cd\u30eb\u3068\u306f<\/a><\/h2>\n<p>\n\u3000\u30c1\u30e3\u30cd\u30eb\u3068\u3044\u3046\u8a00\u8449\u306f\u3001\u69d8\u3005\u306a\u610f\u5473\u3067\u4f7f\u308f\u308c\u3066\u3044\u307e\u3059\u304c\u3001<br \/>\n\u57fa\u672c\u7684\u306b\u306f\u4ed6\u306e\u30c7\u30d0\u30a4\u30b9\u3068\u306e\u3042\u3044\u3060\u3067\u30c7\u30fc\u30bf\u306e\u5165\u51fa\u529b\u3092\u884c\u3046\u305f\u3081\u306e\u4f1d\u9001\u8def\u3092\u793a\u3059\u3088\u3046\u3067\u3059\u3002<strong>java.nio.channels.FileChannel<\/strong> \u306f\u30d5\u30a1\u30a4\u30eb\u3078\u306e\u8aad\u307f\u8fbc\u307f\u3001\u66f8\u304d\u8fbc\u307f\u3092\u884c\u3046\u305f\u3081\u306e\u63a5\u7d9a\u3092\u8868\u3059\u30af\u30e9\u30b9\u3068\u306a\u308a\u307e\u3059\u3002<br \/>\n<br \/><strong>transferTo<\/strong> \u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30b3\u30d4\u30fc\u5143\u3068\u306a\u308b\u30d5\u30a1\u30a4\u30eb\u304b\u3089\u3001\u30b3\u30d4\u30fc\u5148\u306e\u30c1\u30e3\u30cd\u30eb\u306b\u30d0\u30a4\u30c8\u30c7\u30fc\u30bf\u3092\u8ee2\u9001\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u3001JavaAPI \u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u304b\u3089\u5f15\u7528\u3002\n<\/p>\n<blockquote><p>\n<strong>transferTo(long position, long count, WritableByteChannel target)<\/strong><br \/>\n\u3053\u306e\u30c1\u30e3\u30cd\u30eb\u306e\u30d5\u30a1\u30a4\u30eb\u304b\u3089\u6307\u5b9a\u3055\u308c\u305f\u66f8\u304d\u8fbc\u307f\u53ef\u80fd\u306a\u30d0\u30a4\u30c8\u30c1\u30e3\u30cd\u30eb\u3078\u30d0\u30a4\u30c8\u3092\u8ee2\u9001\u3057\u307e\u3059\u3002<br \/>\n\u3053\u306e\u30c1\u30e3\u30cd\u30eb\u304b\u3089\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u3093\u3067\u30bf\u30fc\u30b2\u30c3\u30c8\u30c1\u30e3\u30cd\u30eb\u306b\u66f8\u304d\u8fbc\u3080\u3068\u3044\u3046\u5358\u7d14\u306a\u30eb\u30fc\u30d7\u3088\u308a\u3082\u3001\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u307b\u3046\u304c\u305a\u3063\u3068\u52b9\u7387\u7684\u306b\u51e6\u7406\u3067\u304d\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u591a\u304f\u306e\u30aa\u30da\u30ec\u30fc\u30c6\u30a3\u30f3\u30b0\u30b7\u30b9\u30c6\u30e0\u306f\u3001\u30d5\u30a1\u30a4\u30eb\u30b7\u30b9\u30c6\u30e0\u30ad\u30e3\u30c3\u30b7\u30e5\u304b\u3089\u30bf\u30fc\u30b2\u30c3\u30c8\u30c1\u30e3\u30cd\u30eb\u3078\u30d0\u30a4\u30c8\u3092\u76f4\u63a5\u8ee2\u9001\u3067\u304d\u307e\u3059\u3002 \u3053\u306e\u3068\u304d\u3001\u30d0\u30a4\u30c8\u306e\u30b3\u30d4\u30fc\u306f\u884c\u308f\u308c\u307e\u305b\u3093\u3002\n<\/p><\/blockquote>\n<p>\n\u3000\u4eca\u56de\u306e\u691c\u8a3c\u7d50\u679c\u3067\u306f\u3001\u901a\u5e38\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u5229\u7528\u3059\u308b\u65b9\u6cd5\u3084\u3001<br \/>\nFileChannel \u306e\u4ed6\u306e\u65b9\u6cd5\uff08 ByteBuffer#allocateDirect \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u7b49\uff09\u3088\u308a\u9ad8\u901f\u306b\u30b3\u30d4\u30fc\u51e6\u7406\u304c\u884c\u3048\u307e\u3057\u305f\u3002<\/p>\n<p><script type=\"text\/javascript\" src=\"https:\/\/chat-messenger.com\/js\/common.js?dd12sssas2223\" charset=\"UTF-8\"><\/script><br \/>\n<script type=\"text\/javascript\"> writePR(); <\/script><\/p>\n<h2 class=\"common_title\"><a name=\"2\">\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0<\/a><\/h2>\n<p><textarea readonly=\"readonly\" style=\"font-size: 13px;height: 400px;\" class=\"src\" onclick=\"this.focus();this.select()\">\/**<br \/>\n * \u30b3\u30d4\u30fc\u5143\u306e\u30d1\u30b9[srcPath]\u304b\u3089\u3001\u30b3\u30d4\u30fc\u5148\u306e\u30d1\u30b9[destPath]\u3078<br \/>\n * \u30d5\u30a1\u30a4\u30eb\u306e\u30b3\u30d4\u30fc\u3092\u884c\u3044\u307e\u3059\u3002<br \/>\n * \u30b3\u30d4\u30fc\u51e6\u7406\u306b\u306fFileChannel#transferTo\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3057\u307e\u3059\u3002<br \/>\n * \u5c1a\u3001\u30b3\u30d4\u30fc\u51e6\u7406\u7d42\u4e86\u5f8c\u3001\u5165\u529b\u30fb\u51fa\u529b\u306e\u30c1\u30e3\u30cd\u30eb\u3092\u30af\u30ed\u30fc\u30ba\u3057\u307e\u3059\u3002<br \/>\n * @param srcPath    \u30b3\u30d4\u30fc\u5143\u306e\u30d1\u30b9<br \/>\n * @param destPath    \u30b3\u30d4\u30fc\u5148\u306e\u30d1\u30b9<br \/>\n * @throws IOException    \u4f55\u3089\u304b\u306e\u5165\u51fa\u529b\u51e6\u7406\u4f8b\u5916\u304c\u767a\u751f\u3057\u305f\u5834\u5408<br \/>\n *\/<br \/>\npublic static void copyTransfer(String srcPath, String destPath)<br \/>\n    throws IOException {<\/p>\n<p>    FileChannel srcChannel = new<br \/>\n        FileInputStream(srcPath).getChannel();<br \/>\n    FileChannel destChannel = new<br \/>\n        FileOutputStream(destPath).getChannel();<br \/>\n    try {<br \/>\n        srcChannel.transferTo(0, srcChannel.size(), destChannel);<br \/>\n    } finally {<br \/>\n        srcChannel.close();<br \/>\n        destChannel.close();<br \/>\n    }<\/p>\n<p>}<br \/>\n<\/textarea><\/p>\n<h2 class=\"common_title\"><a name=\"3\">\u5b9f\u884c<\/a><\/h2>\n<p>\n\u3000\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u30d5\u30a1\u30a4\u30eb\u30b3\u30d4\u30fc\u3092\u884c\u3046\u305f\u3081\u306b\u3001C\u30c9\u30e9\u30a4\u30d6\u76f4\u4e0b\u306b 100MB \u306e\u30d5\u30a1\u30a4\u30eb\u300c100M.txt\u300d\u3092\u7528\u610f\u3057\u307e\u3057\u305f\u3002<br \/>\n\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u306f <i>C:\\100M.txt<\/i> \u3092\u30b3\u30d4\u30fc\u3057\u3066 <i>C:\\a.txt<\/i> \u306e\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n<p>\u5c1a\u3001\u30b5\u30f3\u30d7\u30eb\u306e\u5b9f\u884c\u306f\u4ee5\u4e0b\u306e\u74b0\u5883\u3067\u884c\u3044\u307e\u3057\u305f\u3002<br \/>\nOS : WindowsXP<br \/>\nCPU : Athlon 1.46GHz<br \/>\n\u30e1\u30e2\u30ea\u30fc : 1GB<br \/>\nJRE : 1.6.4\n<\/p>\n<p>\u25c6\u5b9f\u884c\u4f8b<\/p>\n<pre class=\"sample_src\">\/**\r\n * \u5b9f\u884c\u4f8b\r\n * @param args\r\n *\/\r\npublic static void main(String[] args) {\r\n    try {\r\n        copyTransfer(\"C:\\\\100M.txt\", \"C:\\\\a.txt\");\r\n    } catch (IOException e) {\r\n        e.printStackTrace();\r\n    }\r\n}\r\n<\/pre>\n<p>\u25c6\u5b9f\u884c\u7d50\u679c<br \/>\n<a href=\"https:\/\/chat-messenger.com\/images\/file_copy.jpg\" target=\"_blank\"><br \/>\n<img decoding=\"async\" src=\"https:\/\/chat-messenger.com\/images\/file_copy.jpg\" alt=\"\" border=\"0\"><\/a><br clear=\"all\"><\/p>\n<p>\n\u3000<strong>FileChannel#transferTo<\/strong> \u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3057\u305f\u30b3\u30d4\u30fc\u51e6\u7406\u3067\u306f<br \/>\n100MB \u306e\u30d5\u30a1\u30a4\u30eb\u306e\u30b3\u30d4\u30fc\u51e6\u7406\u304c 3 \u79d2\u7a0b\u5ea6\u3067\u5b8c\u4e86\u3057\u307e\u3057\u305f\u3002\u307e\u305f\u30b3\u30d4\u30fc\u51e6\u7406\u4e2d\u306e\u30d2\u30fc\u30d7\u4f7f\u7528\u91cf\u306b\u3064\u3044\u3066\u3082 300 (KB)\u3000\u7a0b\u3067\u3057\u305f\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b\u3001<a href=\"https:\/\/chat-messenger.com\/blog\/java\/file-copy\">Java \u30d5\u30a1\u30a4\u30eb\u30b3\u30d4\u30fc\uff08\u30d0\u30c3\u30d5\u30a1\u30b5\u30a4\u30ba\u3092\u5909\u66f4\uff09<\/a>\u3067\u7d39\u4ecb\u3057\u3066\u3044\u308b\u65b9\u6cd5\u3067\u306f\u3001<br \/>\n\u6700\u3082\u52b9\u7387\u306e\u826f\u304b\u3063\u305f 1000KB \u306e\u30d0\u30c3\u30d5\u30a1\u30b5\u30a4\u30ba\u3092\u6307\u5b9a\u3057\u305f\u5834\u5408\u3067\u3001\u51e6\u7406\u6642\u9593\u306f 4 \u79d2\u7a0b\u5ea6\u3001\u30d2\u30fc\u30d7\u4f7f\u7528\u91cf\u306f 1,300KB \u7a0b\u5ea6\u3067\u3057\u305f\u3002\n<\/p>\n<p>\n\u3000\u30b9\u30c8\u30ea\u30fc\u30e0\u306b\u3088\u308b\u30d5\u30a1\u30a4\u30eb\u30b3\u30d4\u30fc\u3067\u3082\u3001\u30d0\u30c3\u30d5\u30a1\u30b5\u30a4\u30ba\u3092\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u3059\u308b\u4e8b\u3067\u9ad8\u901f\u5316\u3055\u308c\u308b\u305f\u3081\u3001<br \/>\n\u4e00\u3064\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u30b3\u30d4\u30fc\u3059\u308b\u51e6\u7406\u3067\u306f\u305d\u308c\u7a0b\u5dee\u306f\u7121\u3044\u3068\u8a00\u3048\u308b\u3067\u3057\u3087\u3046\u3002<br \/>\n\u3057\u304b\u3057\u306a\u304c\u3089\u3001\u5927\u304d\u306a\u30d5\u30a1\u30a4\u30eb\u3092\u9023\u7d9a\u3057\u3066\u30b3\u30d4\u30fc\u3059\u308b\u5834\u5408\u3084\u3001\u8907\u6570\u306e\u30b3\u30d4\u30fc\u51e6\u7406\u3092\u5e73\u884c\u3057\u3066\u5b9f\u884c\u3059\u308b\u5834\u5408\u3067\u306f\u3001\u51e6\u7406\u901f\u5ea6\u30fb\u30d2\u30fc\u30d7\u4f7f\u7528\u91cf\u306e\u89b3\u70b9\u3067 FileChannel \u306f\u52b9\u679c\u3092\u767a\u63ee\u3067\u304d\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java \u30d5\u30a1\u30a4\u30eb\u30b3\u30d4\u30fc\uff08\u7c21\u5358\u30fb\u9ad8\u901f\uff09FileChannel#transferTo \u3000Java \u3067\u30d5\u30a1\u30a4\u30eb\u3092\u30b3 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":"","footnotes":""},"categories":[19],"tags":[],"class_list":["post-939","post","type-post","status-publish","format-standard","hentry","category-java"],"_links":{"self":[{"href":"https:\/\/chat-messenger.com\/de\/wp-json\/wp\/v2\/posts\/939","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/chat-messenger.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/chat-messenger.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/chat-messenger.com\/de\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/chat-messenger.com\/de\/wp-json\/wp\/v2\/comments?post=939"}],"version-history":[{"count":8,"href":"https:\/\/chat-messenger.com\/de\/wp-json\/wp\/v2\/posts\/939\/revisions"}],"predecessor-version":[{"id":1883,"href":"https:\/\/chat-messenger.com\/de\/wp-json\/wp\/v2\/posts\/939\/revisions\/1883"}],"wp:attachment":[{"href":"https:\/\/chat-messenger.com\/de\/wp-json\/wp\/v2\/media?parent=939"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chat-messenger.com\/de\/wp-json\/wp\/v2\/categories?post=939"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chat-messenger.com\/de\/wp-json\/wp\/v2\/tags?post=939"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}