{"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":"filechannel-transferto","status":"publish","type":"post","link":"https:\/\/chat-messenger.com\/zh\/\u535a\u5ba2\/java\/\u6587\u4ef6\u901a\u9053\u8f6c\u5230","title":{"rendered":"Java \u6587\u4ef6\u590d\u5236\uff08\u7b80\u5355\u5feb\u6377\uff09"},"content":{"rendered":"<h2 class=\"common_title\"><a name=\"0\">Java \u6587\u4ef6\u590d\u5236\uff08\u7b80\u5355\u5feb\u6377\uff09<\/a>\u6587\u4ef6\u901a\u9053 #ransferTo<\/h2>\n<p>\n\u3000Java.<strong>\u590d\u5236\u6587\u4ef6<\/strong>\u4e0b\u9762\u7684\u793a\u4f8b\u7a0b\u5e8f\u5c31\u662f\u8fd9\u6837\u505a\u7684\u3002<br \/>\n\u793a\u4f8b\u7a0b\u5e8f\u57fa\u4e8e J2SE1.4 \u4e2d\u5f15\u5165\u7684\u65b0 I\/O\u3002 <strong>java.nio.channels.FileChannel#ransferTo<\/strong> \u65b9\u6cd5<br \/>\n\u8fd9\u662f\u6700\u7b80\u5355\u7684\u7f16\u7801\u65b9\u5f0f\uff0c\u56e0\u4e3a\u5b83\u5141\u8bb8\u4f60\u4e3a\u590d\u5236\u8fc7\u7a0b\u7f16\u5199\u7a0b\u5e8f\uff0c\u800c\u65e0\u9700\u8003\u8651\u8bfb\u53d6\u6570\u636e\u6240\u9700\u7684\u7f13\u51b2\u533a\u3002\n<\/p>\n<h2 class=\"common_title\"><a name=\"1\">\u4ec0\u4e48\u662f\u901a\u9053\uff1f<\/a><\/h2>\n<p>\n\u901a\u9053\u8fd9\u4e2a\u8bcd\u6709\u591a\u79cd\u4e0d\u540c\u7684\u4f7f\u7528\u65b9\u5f0f\u3002<br \/>\n\u57fa\u672c\u4e0a\uff0c\u5b83\u4f3c\u4e4e\u8868\u793a\u5176\u4ed6\u8bbe\u5907\u4e4b\u95f4\u8f93\u5165\u548c\u8f93\u51fa\u6570\u636e\u7684\u4f20\u8f93\u8def\u5f84\u3002<strong>java.nio.channels.FileChannel.<\/strong> \u5c06\u662f\u4e00\u4e2a\u8868\u793a\u8bfb\u5199\u6587\u4ef6\u8fde\u63a5\u7684\u7c7b\u3002<br \/>\n<br \/><strong>\u8f6c\u81f3<\/strong> \u8be5\u65b9\u6cd5\u53ef\u5c06\u5b57\u8282\u6570\u636e\u4ece\u6e90\u6587\u4ef6\u4f20\u8f93\u5230\u76ee\u6807\u901a\u9053\u3002<\/p>\n<p>\u4ee5\u4e0b\u5185\u5bb9\u6458\u81ea JavaAPI \u6587\u6863\u3002\n<\/p>\n<blockquote><p>\n<strong>transferTo( long position, long count, WritableByteChannel target)<\/strong><br \/>\n\u5c06\u5b57\u8282\u4ece\u8be5\u901a\u9053\u4e0a\u7684\u6587\u4ef6\u4f20\u8f93\u5230\u6307\u5b9a\u7684\u53ef\u5199\u5b57\u8282\u901a\u9053\u3002<br \/>\n\u8fd9\u79cd\u65b9\u6cd5\u53ef\u80fd\u6bd4\u4ece\u8be5\u901a\u9053\u8bfb\u53d6\u6570\u636e\u5e76\u5199\u5165\u76ee\u6807\u901a\u9053\u7684\u7b80\u5355\u5faa\u73af\u66f4\u6709\u6548\u3002\u8bb8\u591a\u64cd\u4f5c\u7cfb\u7edf\u53ef\u4ee5\u76f4\u63a5\u4ece\u6587\u4ef6\u7cfb\u7edf\u7f13\u5b58\u5411\u76ee\u6807\u901a\u9053\u4f20\u8f93\u5b57\u8282\u3002 \u6b64\u65f6\u4e0d\u4f1a\u590d\u5236\u5b57\u8282\u3002\n<\/p><\/blockquote>\n<p>\n\u8fd9\u4e2a\u9a8c\u8bc1\u7ed3\u679c\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528\u666e\u901a\u6d41\uff0c<br \/>\n\u590d\u5236\u8fc7\u7a0b\u6bd4\u5176\u4ed6 FileChannel \u65b9\u6cd5\uff08\u4f8b\u5982\u4f7f\u7528 ByteBuffer#allocateDirect \u65b9\u6cd5\uff09\u66f4\u5feb\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\">\u793a\u4f8b\u7a0b\u5e8f<\/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>    \u6587\u4ef6\u901a\u9053 srcChannel = \u65b0<br \/>\n        FileInputStream(srcPath).getChannel();<br \/>\n    \u6587\u4ef6\u901a\u9053 destChannel = \u65b0<br \/>\n        FileOutputStream(destPath).getChannel();<br \/>\n    \u5c1d\u8bd5 {<br \/>\n        srcChannel.transferTo(0, srcChannel.size(), destChannel);<br \/>\n    } \u6700\u540e {<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\">\u6267\u884c<\/a><\/h2>\n<p>\n\u3000\u76f4\u63a5\u5728 C \u76d8\u4e0b\u51c6\u5907\u4e86\u4e00\u4e2a 100 MB \u7684\u6587\u4ef6 \"100M.txt\"\uff0c\u7528\u4e8e\u590d\u5236\u6837\u672c\u7a0b\u5e8f\u7684\u6587\u4ef6\u3002<br \/>\n\u5728\u793a\u4f8b\u7a0b\u5e8f\u4e2d <i>C:\\100M.txt<\/i> \u590d\u5236\u5e76\u7c98\u8d34 <i>C:\\a.txt<\/i> \u6587\u4ef6<\/p>\n<p>\u6837\u54c1\u5728\u4ee5\u4e0b\u73af\u5883\u4e2d\u8fd0\u884c\u3002<br \/>\n\u64cd\u4f5c\u7cfb\u7edf\uff1aWindowsXP<br \/>\n\u4e2d\u592e\u5904\u7406\u5668\uff1aAthlon 1.46GHz<br \/>\n\u5185\u5b58\uff1a1GB<br \/>\nJRE : 1.6.4\n<\/p>\n<p>\u6267\u884c\u793a\u4f8b<\/p>\n<pre class=\"sample_src\">\/**\r\n * \u6267\u884c\u793a\u4f8b\u3002\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>\u6267\u884c\u7ed3\u679c<br \/>\n<a href=\"https:\/\/chat-messenger.com\/images\/file_copy.jpg\" target=\"_blank\"><br \/>\n<img src=\"https:\/\/chat-messenger.com\/images\/file_copy.jpg\" alt=\"\" border=\"0\"><\/a><br clear=\"all\"><\/p>\n<p>\n\u3000<strong>\u6587\u4ef6\u901a\u9053 #ransferTo<\/strong> \u5728\u590d\u5370\u5904\u7406\u4e2d\u4f7f\u7528\u8be5\u65b9\u6cd5<br \/>\n\u590d\u5236\u4e00\u4e2a 100MB \u7684\u6587\u4ef6\u5927\u7ea6\u9700\u8981 3 \u79d2\u3002\u6b64\u5916\uff0c\u590d\u5236\u8fc7\u7a0b\u4e2d\u7684\u5806\u4f7f\u7528\u91cf\u7ea6\u4e3a 300 (KB)\u3002<\/p>\n<p>\u987a\u4fbf\u63d0\u4e00\u53e5<a href=\"https:\/\/chat-messenger.com\/zh\/\u535a\u5ba2\/java\/\u6587\u4ef6\u590d\u5236\/\">Java \u6587\u4ef6\u590d\u5236\uff08\u66f4\u6539\u7f13\u51b2\u533a\u5927\u5c0f\uff09<\/a>\u5728\u4ecb\u7ecd\u7684\u65b9\u6cd5\u4e2d<br \/>\n\u5f53\u6211\u4eec\u6307\u5b9a\u6700\u6709\u6548\u7684\u7f13\u51b2\u533a\u5927\u5c0f 1000KB \u65f6\uff0c\u5904\u7406\u65f6\u95f4\u7ea6\u4e3a 4 \u79d2\uff0c\u5806\u4f7f\u7528\u91cf\u7ea6\u4e3a 1,300KB\u3002\n<\/p>\n<p>\n\u5373\u4f7f\u901a\u8fc7\u6d41\u590d\u5236\u6587\u4ef6\u4e5f\u53ef\u4ee5\u901a\u8fc7\u8c03\u6574\u7f13\u51b2\u533a\u5927\u5c0f\u6765\u52a0\u901f\uff0c\u6240\u4ee5<br \/>\n\u53ef\u4ee5\u8bf4\uff0c\u590d\u5236\u5355\u4e2a\u6587\u4ef6\u7684\u8fc7\u7a0b\u5e76\u6ca1\u6709\u592a\u5927\u7684\u533a\u522b\u3002<br \/>\n\u4e0d\u8fc7\uff0c\u5f53\u8fde\u7eed\u590d\u5236\u5927\u6587\u4ef6\u6216\u5e76\u884c\u6267\u884c\u591a\u4e2a\u590d\u5236\u64cd\u4f5c\u65f6\uff0cFileChannel \u53ef\u4ee5\u6709\u6548\u63d0\u9ad8\u5904\u7406\u901f\u5ea6\u548c\u5806\u4f7f\u7528\u7387\u3002<\/p>","protected":false},"excerpt":{"rendered":"<p>Java \u6587\u4ef6\u590d\u5236\uff08\u7b80\u5355\/\u5feb\u901f\uff09FileChannel#transferTo \u4f7f\u7528 Java \u590d\u5236\u6587\u4ef6 [...]<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":""},"categories":[19],"tags":[],"_links":{"self":[{"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/posts\/939"}],"collection":[{"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/comments?post=939"}],"version-history":[{"count":8,"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/posts\/939\/revisions"}],"predecessor-version":[{"id":1883,"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/posts\/939\/revisions\/1883"}],"wp:attachment":[{"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/media?parent=939"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/categories?post=939"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/tags?post=939"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}