{"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\/\u535a\u5ba2\/java\/\u6587\u4ef6\u590d\u5236","title":{"rendered":"Java \u6587\u4ef6\u590d\u5236\uff08\u66f4\u6539\u7f13\u51b2\u533a\u5927\u5c0f\uff09"},"content":{"rendered":"<h2 class=\"common_title\"><a name=\"0\">Java \u6587\u4ef6\u590d\u5236\uff08\u66f4\u6539\u7f13\u51b2\u533a\u5927\u5c0f\uff09<\/a><\/h2>\n<p>\n\u3000Java. <strong>java.io.InputStream.<\/strong>,,<strong>java.io.OutputStream.<\/strong> \u5728<br \/>\n\u4ecb\u7ecd\u4f7f\u7528\u8f93\u5165\/\u8f93\u51fa\u6d41\u6267\u884c\u590d\u5236\u5904\u7406\u7684\u793a\u4f8b\u7a0b\u5e8f\u3002<br \/>\n\u901a\u8fc7\u589e\u52a0\u8bfb\u53d6\u7f13\u51b2\u533a\u7684\u5927\u5c0f\uff0c\u4f7f\u7528\u6d41\u7684\u590d\u5236\u8fc7\u7a0b\u751a\u81f3\u53ef\u4ee5\u76f8\u5bf9\u5feb\u901f\u5730\u590d\u5236\u5927\u6587\u4ef6\u3002<br \/>\u5728\u793a\u4f8b\u7a0b\u5e8f\u4e2d\uff0c\u8bfb\u53d6\u6570\u636e\u7684\u7f13\u51b2\u533a\u5927\u5c0f\u53ef\u4ee5\u4f5c\u4e3a\u53c2\u6570\u6307\u5b9a\u3002\n<\/p>\n<p>\n\u3000\u6307\u5b9a\u7684\u8bfb\u53d6\u7f13\u51b2\u533a\u662f\u5728 JavaVM \u5806\u4e2d\u5206\u914d\u7684\uff0c\u56e0\u6b64\u8fc7\u5927\u7684\u7f13\u51b2\u533a\u6548\u7387\u4f1a\u5f88\u4f4e\u3002\u56e0\u6b64\uff0c\u5728\u590d\u5236\u6587\u4ef6\u65f6\uff0c\u4e5f\u4f1a\u540c\u65f6\u68c0\u67e5\u9ad8\u6548\u6570\u636e\u8bfb\u53d6\u7f13\u51b2\u533a\u7684\u5927\u5c0f\u3002\n<\/p>\n<h2 class=\"common_title\"><a name=\"1\">\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\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 * \u5c06\u6570\u636e\u4ece\u8f93\u5165\u6d41\u5199\u5165\u8f93\u51fa\u6d41\u3002<br \/>\n *\u590d\u5236\u8fc7\u7a0b\u5b8c\u6210\u540e\uff0c\u8f93\u5165\/\u8f93\u51fa\u6d41\u5c06\u5173\u95ed\u3002<br \/>\n * \u8f93\u5165\u6d41\u4e2d\u7684@param<br \/>\n * @param os \u8f93\u51fa\u6d41<br \/>\n * @param bufferSize \u6570\u636e\u8bfb\u53d6\u7f13\u51b2\u533a\u5927\u5c0f (KB)\u3002<br \/>\n * @throws IOException \u5982\u679c\u53d1\u751f\u67d0\u4e9b\u8f93\u5165\/\u8f93\u51fa\u5904\u7406\u5f02\u5e38<br \/>\n *\/<br \/>\n\u516c\u5171\u9759\u6001\u65e0\u6548copyStream\uff08\u8f93\u5165\u6d41\uff0c\u8f93\u51fa\u6d41\u64cd\u4f5c\u7cfb\u7edf\uff0c<br \/>\n    int bufferSize) \u629b\u51fa IOException {<br \/>\n    int len = -1;<br \/>\n    byte[] b = \u65b0\u5b57\u8282[bufferSize * 1024];<br \/>\n    \u5c1d\u8bd5 {<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\u540e {<br \/>\n        \u5982\u679c\uff08\u5728\uff01=\u7a7a\uff09{<br \/>\n            \u5c1d\u8bd5 {<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            \u5c1d\u8bd5 {<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\">\u6267\u884c<\/a><\/h2>\n<p>\n\u3000\u76f4\u63a5\u5728 C \u76d8\u4e0b\u51c6\u5907\u4e86\u4e00\u4e2a 100MB \u7684\u6587\u4ef6 \"100M.txt\"\uff0c\u7528\u4e8e\u590d\u5236\u793a\u4f8b\u7a0b\u5e8f\u7684\u6587\u4ef6\u3002\u5728\u793a\u4f8b\u7a0b\u5e8f\u4e2d <i>C:\\100M.txt<\/i> \u4ee5 1000 KB \u7f13\u51b2\u533a\u5927\u5c0f\u4e3a\u5355\u4f4d\u8bfb\u53d6\u6570\u636e\u3002 <i>C:\\a.txt<\/i>  \u590d\u5236\u5230<\/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        copyStream(\"C:\\\\100M.txt\", \"C:\\\\a.txt\",1000);\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<h2 class=\"common_title\"><a name=\"4\">\u66f4\u6539\u7f13\u51b2\u533a\u5927\u5c0f<\/a><\/h2>\n<p>\n\u8981\u5728\u590d\u5236\u6587\u4ef6\u65f6\u68c0\u67e5\u6709\u6548\u7684\u6570\u636e\u8bfb\u53d6\u7f13\u51b2\u533a\u5927\u5c0f\uff0c\u8bf7\u4f7f\u7528 copyStream \u7684\u7b2c\u4e09\u4e2a\u53c2\u6570\u4f5c\u4e3a<br \/>\n\u4e0b\u9762\u603b\u7ed3\u4e86\u4ee5 1KB\u3001100KB\u30011000KB \u548c 10000KB \u4e3a\u5355\u4f4d\u7684\u7c7b\u4f3c\u590d\u5236\u5904\u7406\u7684\u7ed3\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\u867d\u7136\u4ec5\u4ece\u4e0a\u9762\u7684\u7ed3\u679c\u4e0d\u80fd\u5f97\u51fa\u7ed3\u8bba\uff0c\u4f46\u5982\u679c\u4ee51000KB\u4e3a\u5355\u4f4d\u6307\u5b9a\u6570\u636e\u8bfb\u53d6\u7f13\u51b2\u533a\u5927\u5c0f\uff0c<br \/>\n\u7ed3\u679c\u8868\u660e\uff0c\u5728\u590d\u5236\u5904\u7406\u671f\u95f4\uff0c\u5b83\u5728\u5806\u4f7f\u7528\u548c\u5904\u7406\u65f6\u95f4\u65b9\u9762\u662f\u9ad8\u6548\u7684\u3002<br \/>\n\u5f53\u6587\u4ef6\u5927\u5c0f\u589e\u52a0\u65f6\uff08\u7ea6 1 GB\uff09\uff0c\u4e5f\u5f97\u5230\u4e86\u7c7b\u4f3c\u7684\u7ed3\u679c\u3002<\/p>\n<p>\u76f8\u53cd\uff0c\u5728\u590d\u5236\u5c0f\u6587\u4ef6\uff08\u7ea6 1MB \u6216\u66f4\u5c0f\uff09\u65f6\uff0c\u6700\u597d\u6307\u5b9a 100KB \u5de6\u53f3\u7684\u7f13\u51b2\u533a\u5927\u5c0f\uff0c\u56e0\u4e3a\u7f13\u51b2\u533a\u8fc7\u5927\u5c06\u6beb\u65e0\u7528\u5904\u3002\n<\/p>\n\n<h2 class=\"common_title\"><a name=\"5\">\u4f7f\u7528 FileChannel \u66f4\u5feb<\/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\u590d\u5236\u5904\u7406\u5bf9\u4e8e\u7406\u89e3\u8f93\u5165\/\u8f93\u51fa\u6d41\u5f88\u91cd\u8981\uff0c\u4f46\u662f<br \/>\nJ2SE1.4 \u4e2d\u5f15\u5165\u7684\u65b0 I\/O <strong>java.nio.channels.FileChannel#ransferTo<\/strong><br \/>\n\u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u66f4\u9ad8\u6548\u5730\u590d\u5236\u6587\u4ef6\u3002<br \/>\n\u4e0b\u4e00\u8282\u5c06\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528 FileChannel \u65b9\u4fbf\u5feb\u6377\u5730\u590d\u5236\u6587\u4ef6\u3002<br \/>\n\u21d2 <\/a><a href=\"https:\/\/chat-messenger.com\/zh\/\u535a\u5ba2\/java\/\u6587\u4ef6\u901a\u9053\u8f6c\u5230\/\"><strong>Java \u6587\u4ef6\u590d\u5236\uff08\u7b80\u5355\u5feb\u6377\uff09<\/strong><\/a><br \/>\n<\/p>","protected":false},"excerpt":{"rendered":"<p>Java \u6587\u4ef6\u590d\u5236\uff08\u66f4\u6539\u7f13\u51b2\u533a\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\/wp-json\/wp\/v2\/posts\/936"}],"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=936"}],"version-history":[{"count":6,"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/posts\/936\/revisions"}],"predecessor-version":[{"id":4541,"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/posts\/936\/revisions\/4541"}],"wp:attachment":[{"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/media?parent=936"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/categories?post=936"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chat-messenger.com\/zh\/wp-json\/wp\/v2\/tags?post=936"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}