{"id":936,"date":"2018-09-17T18:37:49","date_gmt":"2018-09-17T09:37:49","guid":{"rendered":"https:\/\/chat-messenger.com\/?p=936"},"modified":"2019-10-04T02:02:07","modified_gmt":"2019-10-03T17:02:07","slug":"file-copy","status":"publish","type":"post","link":"https:\/\/chat-messenger.com\/zh_tw\/\u90e8\u843d\u683c\/java\/\u6587\u4ef6\u526f\u672c","title":{"rendered":"Java\u6a94\u6848\u8907\u88fd\uff08\u66f4\u6539\u7de9\u885d\u5340\u5927\u5c0f\uff09"},"content":{"rendered":"<h2 class=\"common_title\"><a name=\"0\">Java\u6a94\u6848\u8907\u88fd\uff08\u66f4\u6539\u7de9\u885d\u5340\u5927\u5c0f\uff09<\/a><\/h2>\n<p>\n\u722a\u54c7\u8a9e <strong>java.io.InputStream<\/strong>,,<strong>java.io.OutputStream<\/strong> \u5728<br \/>\n\u4ecb\u7d39\u4f7f\u7528\u8f38\u5165\/\u8f38\u51fa\u6d41\u57f7\u884c\u8907\u88fd\u8655\u7406\u7684\u7bc4\u4f8b\u7a0b\u5f0f\u3002<br \/>\n\u5728\u4f7f\u7528\u6d41\u7684\u8907\u88fd\u8655\u7406\u4e2d\uff0c\u900f\u904e\u589e\u52a0\u8b80\u53d6\u7de9\u885d\u5340\u5927\u5c0f\uff0c\u5373\u4f7f\u662f\u5927\u6a94\u6848\u4e5f\u53ef\u4ee5\u76f8\u5c0d\u5feb\u901f\u5730\u8907\u88fd\u3002<br \/>\u5728\u7bc4\u4f8b\u7a0b\u5f0f\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u53c3\u6578\u6307\u5b9a\u8cc7\u6599\u8b80\u53d6\u7de9\u885d\u5340\u5927\u5c0f\u3002\n<\/p>\n<p>\n\u6307\u5b9a\u7684\u8b80\u53d6\u7de9\u885d\u5340\u662f\u5728JavaVM\u5806\u4e2d\u4fdd\u8b77\u7684\uff0c\u6240\u4ee5\u8a2d\u5b9a\u592a\u5927\u6703\u5c0e\u81f4\u6548\u7387\u4f4e\u4e0b\u3002\u56e0\u6b64\uff0c\u6211\u5011\u5728\u8907\u88fd\u6a94\u6848\u6642\u4e5f\u6703\u6aa2\u67e5\u6709\u6548\u7684\u8cc7\u6599\u8b80\u53d6\u7de9\u885d\u5340\u5927\u5c0f\u3002\n<\/p>\n<h2 class=\"common_title\"><a name=\"1\">\u7bc4\u4f8b\u7a0b\u5f0f<\/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\u30b3\u30d4\u30fc\u5148\u306e\u30d1\u30b9[destPath]\u3078\u30d5\u30a1\u30a4\u30eb\u306e\u30b3\u30d4\u30fc<br \/>\n * \u3092\u884c\u3044\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 * @param bufferSize    \u30c7\u30fc\u30bf\u306e\u8aad\u307f\u8fbc\u307f\u30d0\u30c3\u30d5\u30a1\u30b5\u30a4\u30ba(KB)\u3067\u3059\u3002<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 copyStream(String srcPath, String destPath,<br \/>\n    int bufferSize) throws IOException {<br \/>\n    InputStream in = new FileInputStream(srcPath);<br \/>\n    OutputStream os = new FileOutputStream(destPath);<br \/>\n    copyStream(in, os, bufferSize);<br \/>\n}<\/p>\n<p>\/**<br \/>\n * \u5c07\u8cc7\u6599\u5f9e\u8f38\u5165\u6d41\u5beb\u5165\u8f38\u51fa\u6d41\u3002<br \/>\n *\u8907\u88fd\u904e\u7a0b\u5b8c\u6210\u5f8c\uff0c\u8f38\u5165\/\u8f38\u51fa\u6d41\u5c07\u95dc\u9589\u3002<br \/>\n * \u8f38\u5165\u6d41\u4e2d\u7684@param<br \/>\n * @param os \u8f38\u51fa\u6d41<br \/>\n * @param bufferSize \u8cc7\u6599\u8b80\u53d6\u7de9\u885d\u5340\u5927\u5c0f (KB)\u3002<br \/>\n * @throws IOException \u5982\u679c\u767c\u751f\u67d0\u4e9b\u8f38\u5165\/\u8f38\u51fa\u8655\u7406\u7570\u5e38<br \/>\n *\/<br \/>\n\u516c\u5171\u975c\u614b\u7121\u6548copyStream\uff08\u8f38\u5165\u6d41\uff0c\u8f38\u51fa\u6d41\u4f5c\u696d\u7cfb\u7d71\uff0c<br \/>\n    int bufferSize) \u62cb\u51fa IOException {<br \/>\n    int len = -1;<br \/>\n    byte[] b = \u65b0\u4f4d\u5143\u7d44[bufferSize * 1024];<br \/>\n    \u5617\u8a66 {<br \/>\n        while ((len = in.read(b, 0, b.length)) != -1) {<br \/>\n            os.write(b, 0, len);<br \/>\n        }<br \/>\n        os.flush();<br \/>\n    } \u6700\u5f8c {<br \/>\n        \u5982\u679c\uff08\u5728\uff01=\u7a7a\uff09{<br \/>\n            \u5617\u8a66 {<br \/>\n                \u9644\u5bc4\uff08\uff09;<br \/>\n            } catch (IOException e) {<br \/>\n                e.printStackTrace();<br \/>\n            }<br \/>\n        }<br \/>\n        if (os != null) {<br \/>\n            \u5617\u8a66 {<br \/>\n                os.close();<br \/>\n            } catch (IOException e) {<br \/>\n                e.printStackTrace();<br \/>\n            }<br \/>\n        }<br \/>\n    }<br \/>\n}<br \/>\n<\/textarea><\/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=\"3\">\u57f7\u884c<\/a><\/h2>\n<p>\n\u70ba\u4e86\u8907\u88fd\u7bc4\u4f8b\u7a0b\u5f0f\u6587\u4ef6\uff0c\u6211\u5011\u5728C\u76e4\u4e0b\u76f4\u63a5\u6e96\u5099\u4e86\u4e00\u500b100MB\u7684\u6587\u4ef6\u300c100M.txt\u300d\u3002\u5728\u7bc4\u4f8b\u7a0b\u5f0f\u4e2d\uff0c <i>C:\\100M.txt<\/i> \uff0c\u4ee5\u7de9\u885d\u5340\u5927\u5c0f1000KB\u70ba\u55ae\u4f4d\u8b80\u53d6\u8cc7\u6599\u3002 <i>C:\\a.txt<\/i>  \u8907\u88fd\u5230\u3002<\/p>\n<p>\u6b64\u7bc4\u4f8b\u662f\u5728\u4ee5\u4e0b\u74b0\u5883\u4e2d\u57f7\u884c\u7684\u3002<br \/>\n\u4f5c\u696d\u7cfb\u7d71\uff1aWindows XP<br \/>\nCPU\uff1a\u901f\u9f8d1.46GHz<br \/>\n\u8a18\u61b6\u9ad4\uff1a1GB<br \/>\nJRE\uff1a1.6.4\n<\/p>\n<p>\u25c6\u57f7\u884c\u7bc4\u4f8b<\/p>\n<pre class=\"sample_src\">\/** * \u57f7\u884c\u7bc4\u4f8b * @param args *\/ public static void main(String[] args) { try { copyStream(&quot;C:\\\\100M.txt&quot;, &quot;C:\\\\a.txt&quot;,1000); } catch (IOException e) { e.printStackTrace(); } }\r\n<\/pre>\n<p>\u25c6\u57f7\u884c\u7d50\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<h2 class=\"common_title\"><a name=\"4\">\u66f4\u6539\u7de9\u885d\u5340\u5927\u5c0f<\/a><\/h2>\n<p>\n\u82e5\u8981\u5728\u8907\u88fd\u6a94\u6848\u6642\u6aa2\u67e5\u6709\u6548\u7684\u8cc7\u6599\u8b80\u53d6\u7de9\u885d\u5340\u5927\u5c0f\uff0c\u8acb\u4f7f\u7528 copyStream \u7684\u7b2c\u4e09\u500b\u53c3\u6578\u4f5c\u70ba<br \/>\n\u4ee5\u4e0b\u7e3d\u7d50\u4e86\u4ee5 1KB\u3001100KB\u30011000KB \u548c 10000KB \u70ba\u55ae\u4f4d\u7684\u985e\u4f3c\u8907\u88fd\u8655\u7406\u7684\u7d50\u679c\u3002<br \/>\n<img src=\"https:\/\/chat-messenger.com\/images\/file_copy_stream_reslt.jpg\" alt=\"\" border=\"0\"><br clear=\"all\"><br \/>\n<br \/>\n\u96d6\u7136\u50c5\u5f9e\u4e0a\u9762\u7684\u7d50\u679c\u4e0d\u80fd\u5f97\u51fa\u7d50\u8ad6\uff0c\u4f46\u5982\u679c\u4ee51000KB\u70ba\u55ae\u4f4d\u6307\u5b9a\u8cc7\u6599\u8b80\u53d6\u7de9\u885d\u5340\u5927\u5c0f\uff0c<br \/>\n\u7d50\u679c\u8868\u660e\uff0c\u5728\u8907\u88fd\u8655\u7406\u671f\u9593\uff0c\u5b83\u5728\u5806\u4f7f\u7528\u548c\u8655\u7406\u6642\u9593\u65b9\u9762\u662f\u9ad8\u6548\u7684\u3002<br \/>\n\u5373\u4f7f\u6a94\u6848\u5927\u5c0f\u589e\u52a0\uff08\u7d04 1GB\uff09\uff0c\u4e5f\u80fd\u7372\u5f97\u985e\u4f3c\u7684\u7d50\u679c\u3002<\/p>\n<p>\u53e6\u4e00\u65b9\u9762\uff0c\u7576\u8907\u88fd\u5c0f\u6a94\u6848\uff08\u5927\u7d041MB\u6216\u66f4\u5c0f\uff09\u6642\uff0c\u589e\u52a0\u7de9\u885d\u5340\u5927\u5c0f\u6703\u5f88\u6d6a\u8cbb\uff0c\u6240\u4ee5\u6211\u8a8d\u70ba\u6700\u597d\u6307\u5b9a100KB\u5de6\u53f3\u3002\n<\/p>\n\n<h2 class=\"common_title\"><a name=\"5\">\u4f7f\u7528 FileChannel \u7372\u5f97\u66f4\u5feb\u7684\u901f\u5ea6<\/a><\/h2>\n<p><a name=\"5\"><\/a><\/p>\n<p><a name=\"5\"><br \/>\n\u3000<strong>java.io.InputStream<\/strong>,,<strong>java.io.OutputStream<\/strong><br \/>\n\u8907\u88fd\u8655\u7406\u5c0d\u65bc\u7406\u89e3\u8f38\u5165\/\u8f38\u51fa\u6d41\u5f88\u91cd\u8981\uff0c\u4f46\u662f<br \/>\nJ2SE1.4 \u4e2d\u5f15\u5165\u7684\u65b0 I\/O <strong>java.nio.channels.FileChannel#transferTo<\/strong><br \/>\n\u900f\u904e\u4f7f\u7528\u6b64\u65b9\u6cd5\uff0c\u60a8\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u8907\u88fd\u6587\u4ef6\u3002<br \/>\n\u63a5\u4e0b\u4f86\u6211\u5c07\u5411\u60a8\u5c55\u793a\u5982\u4f55\u4f7f\u7528FileChannel\u8f15\u9b06\u5feb\u901f\u5730\u8907\u88fd\u6587\u4ef6\u3002<br \/>\n\u21d2 <\/a><a href=\"https:\/\/chat-messenger.com\/zh_tw\/\u90e8\u843d\u683c\/java\/\u6587\u4ef6\u901a\u9053\u50b3\u8f38\u81f3\/\"><strong>Java\u6a94\u6848\u8907\u88fd\uff08\u7c21\u55ae\u5feb\u901f\uff09<\/strong><\/a><br \/>\n<\/p>","protected":false},"excerpt":{"rendered":"<p>Java \u6a94\u6848\u8907\u88fd\uff08\u66f4\u6539\u7de9\u885d\u5340\u5927\u5c0f\uff09Java \u4e2d\u7684 java.io.InputStream\uff0cja [...]<\/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_tw\/wp-json\/wp\/v2\/posts\/936"}],"collection":[{"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/comments?post=936"}],"version-history":[{"count":6,"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/posts\/936\/revisions"}],"predecessor-version":[{"id":4541,"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/posts\/936\/revisions\/4541"}],"wp:attachment":[{"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/media?parent=936"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/categories?post=936"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chat-messenger.com\/zh_tw\/wp-json\/wp\/v2\/tags?post=936"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}