{"id":1440,"date":"2017-10-17T09:57:04","date_gmt":"2017-10-17T01:57:04","guid":{"rendered":"https:\/\/www.strongd.net\/?p=1440"},"modified":"2017-10-17T09:57:04","modified_gmt":"2017-10-17T01:57:04","slug":"%e4%bd%bf%e7%94%a8nio%e8%bf%9b%e8%a1%8c%e5%bf%ab%e9%80%9f%e7%9a%84%e6%96%87%e4%bb%b6%e6%8b%b7%e8%b4%9d","status":"publish","type":"post","link":"https:\/\/www.strongd.net\/?p=1440","title":{"rendered":"\u4f7f\u7528NIO\u8fdb\u884c\u5feb\u901f\u7684\u6587\u4ef6\u62f7\u8d1d"},"content":{"rendered":"<ol class=\"dp-j\" start=\"1\">\n<li><span class=\"keyword\">public<\/span>\u00a0<span class=\"keyword\">static<\/span>\u00a0<span class=\"keyword\">void<\/span>\u00a0fileCopy(\u00a0File\u00a0in,\u00a0File\u00a0out\u00a0)<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"keyword\">throws<\/span>\u00a0IOException<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0{<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0FileChannel\u00a0inChannel\u00a0=\u00a0<span class=\"keyword\">new<\/span>\u00a0FileInputStream(\u00a0in\u00a0).getChannel();<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0FileChannel\u00a0outChannel\u00a0=\u00a0<span class=\"keyword\">new<\/span>\u00a0FileOutputStream(\u00a0out\u00a0).getChannel();<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"keyword\">try<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{<\/li>\n<li><span class=\"comment\">\/\/\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0inChannel.transferTo(0,\u00a0inChannel.size(),\u00a0outChannel);\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0original\u00a0&#8212;\u00a0apparently\u00a0has\u00a0trouble\u00a0copying\u00a0large\u00a0files\u00a0on\u00a0Windows\u00a0\u00a0<\/span><\/li>\n<li><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"comment\">\/\/\u00a0magic\u00a0number\u00a0for\u00a0Windows,\u00a064Mb\u00a0&#8211;\u00a032Kb)\u00a0\u00a0<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"keyword\">int<\/span>\u00a0maxCount\u00a0=\u00a0(<span class=\"number\">64<\/span>\u00a0*\u00a0<span class=\"number\">1024<\/span>\u00a0*\u00a0<span class=\"number\">1024<\/span>)\u00a0&#8211;\u00a0(<span class=\"number\">32<\/span>\u00a0*\u00a0<span class=\"number\">1024<\/span>);<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"keyword\">long<\/span>\u00a0size\u00a0=\u00a0inChannel.size();<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"keyword\">long<\/span>\u00a0position\u00a0=\u00a0<span class=\"number\">0<\/span>;<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"keyword\">while<\/span>\u00a0(\u00a0position\u00a0&lt;\u00a0size\u00a0)<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0position\u00a0+=\u00a0inChannel.transferTo(\u00a0position,\u00a0maxCount,\u00a0outChannel\u00a0);<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"keyword\">finally<\/span><\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"keyword\">if<\/span>\u00a0(\u00a0inChannel\u00a0!=\u00a0<span class=\"keyword\">null<\/span>\u00a0)<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0inChannel.close();<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span class=\"keyword\">if<\/span>\u00a0(\u00a0outChannel\u00a0!=\u00a0<span class=\"keyword\">null<\/span>\u00a0)<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0outChannel.close();<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}<\/li>\n<li>\u00a0\u00a0\u00a0\u00a0}<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>public\u00a0static\u00a0void\u00a0fileCopy(\u00a0File\u00a0in,\u00a0File\u00a0out\u00a0) \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0throws\u00a0IOException \u00a0\u00a0\u00a0\u00a0{ \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0FileChannel\u00a0inChannel\u00a0=\u00a0new\u00a0FileInputStream(\u00a0in\u00a0).getChannel(); \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0FileChannel\u00a0outChannel\u00a0=\u00a0new\u00a0FileOutputStream(\u00a0out\u00a0).getChannel(); \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0try \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{ \/\/\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0inChannel.transferTo(0,\u00a0inChannel.size(),\u00a0outChannel);\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0original\u00a0&#8212;\u00a0apparently\u00a0has\u00a0trouble\u00a0copying\u00a0large\u00a0files\u00a0on\u00a0Windows\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0magic\u00a0number\u00a0for\u00a0Windows,\u00a064Mb\u00a0&#8211;\u00a032Kb)\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0int\u00a0maxCount\u00a0=\u00a0(64\u00a0*\u00a01024\u00a0*\u00a01024)\u00a0&#8211;\u00a0(32\u00a0*\u00a01024); \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0long\u00a0size\u00a0=\u00a0inChannel.size(); \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0long\u00a0position\u00a0=\u00a00; \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0while\u00a0(\u00a0position\u00a0&lt;\u00a0size\u00a0) \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{ \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0position\u00a0+=\u00a0inChannel.transferTo(\u00a0position,\u00a0maxCount,\u00a0outChannel\u00a0); \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0} \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0} \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0finally \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{ \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if\u00a0(\u00a0inChannel\u00a0!=\u00a0null\u00a0) \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{ \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0inChannel.close(); \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0} \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if\u00a0(\u00a0outChannel\u00a0!=\u00a0null\u00a0) \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{ \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0outChannel.close(); \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0} \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0} \u00a0\u00a0\u00a0\u00a0}<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[9],"class_list":["post-1440","post","type-post","status-publish","format-standard","hentry","category-java","tag-java-2"],"_links":{"self":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/1440","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1440"}],"version-history":[{"count":1,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/1440\/revisions"}],"predecessor-version":[{"id":1441,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/1440\/revisions\/1441"}],"wp:attachment":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1440"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1440"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1440"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}