{"id":543,"date":"2013-10-30T17:02:32","date_gmt":"2013-10-30T09:02:32","guid":{"rendered":"http:\/\/coderbee.net\/?p=543"},"modified":"2019-01-06T21:25:43","modified_gmt":"2019-01-06T13:25:43","slug":"java-8-ionio-%e5%a2%9e%e5%bc%ba","status":"publish","type":"post","link":"https:\/\/coderbee.net\/index.php\/java\/20131030\/543","title":{"rendered":"Java 8 IO\/NIO \u589e\u5f3a"},"content":{"rendered":"<h3>\u66f4\u4fbf\u6377\u7684\u6587\u672c\u884c\u5904\u7406<\/h3>\n<p><code>BufferedReader<\/code> \u63d0\u4f9b\u4e86\u4e00\u4e2a<code>lines()<\/code>\u65b9\u6cd5\u7528\u4e8e\u8fd4\u56de\u6587\u672c\u884c\u7684\u6d41<code>Stream&lt;String&gt;<\/code>\u3002 <code>Files<\/code>\u7c7b\u4e5f\u63d0\u4f9b\u4e86\u4e00\u4e2a\u540c\u540d\u7684\u65b9\u6cd5<code>lines(Path, Charset)<\/code>\u8fd4\u56de\u6587\u672c\u884c\u7684\u6d41\uff0c\u5728\u8fd4\u56de\u7684\u6d41\u4e0a\u7ed3\u5408Lambda\u53ef\u4ee5\u8fdb\u884c\u4e00\u5e8f\u5217\u4fbf\u6377\u7684\u5904\u7406\u3002<\/p>\n<pre><code class=\"java\">System.out.println(\"\\nBufferedReader.lines\");\r\nBufferedReader bufferedReader = new BufferedReader(new InputStreamReader(new FileInputStream(\"text.txt\")));\r\nbufferedReader\r\n          .lines()\r\n          .filter(line -&gt; line.length() &gt; 2)\r\n          .filter(line -&gt; line.matches(\"\\\\d+\"))\r\n          .forEach(line -&gt; System.out.println(line));\r\n\r\nSystem.out.println(\"\\nFiles.lines\");\r\nStream&lt;String&gt; stream = Files.lines(Paths.get(\"text.txt\"), Charset.forName(\"utf8\"));\r\nstream.filter(line -&gt; line.length() &gt; 5)\r\n          .forEach(line -&gt; System.out.println(line));\r\n<\/code><\/pre>\n<p>\u5728Java SE 8 b116\u7684\u5b9e\u73b0\u91cc\uff0cStream\u662f\u7ee7\u627f\u81eaAutoCloseable\u63a5\u53e3\uff0c\u6240\u4ee5\u53ef\u4ee5\u7ed3\u5408try-with-resourse\u673a\u5236\u6765\u786e\u4fdd\u8d44\u6e90\u7684\u5173\u95ed\u3002<\/p>\n<h3>\u76ee\u5f55\u904d\u5386<\/h3>\n<p><code>Files<\/code>\u65b0\u589e\u4e863\u4e2a\u65b9\u6cd5\u7528\u4e8e\u904d\u5386\u76ee\u5f55\uff1a<code>Files.list(Path),  Files.walk(Path, int, FileVisitOption...),  Files.walk(Path, FileVisitOption...)<\/code>\u3002<\/p>\n<p><code>Files.list<\/code>\u65b9\u6cd5\u53ea\u904d\u5386\u5f53\u524d\u76ee\u5f55\u4e0b\u7684\u6587\u4ef6\u548c\u76ee\u5f55\uff0c<code>Files.walk<\/code>\u65b9\u6cd5\u904d\u5386\u6307\u5b9a\u76ee\u5f55\u4e0b\u7684\u6240\u6709\u6587\u4ef6\u548c\u76ee\u5f55\uff0c\u9664\u975e\u6307\u5b9a\u4e86\u6700\u5927\u6df1\u5ea6\u3002<br \/>\n\u7b2c\u4e00\u4e2a<code>walk<\/code>\u65b9\u6cd5\u7684int\u7c7b\u578b\u53c2\u6570\u7528\u4e8e\u6307\u5b9a\u904d\u5386\u7684\u6700\u5927\u6df1\u5ea6\u3002<\/p>\n<pre><code class=\"java\">System.out.println(\"\\nFiles.list\");\r\nFiles.list(Paths.get(\".\"))\r\n          .filter(path -&gt; !path.toString().endsWith(\".iml\"))\r\n          .forEach(path -&gt; System.out.println(path));\r\n\r\nSystem.out.println(\"\\nFiles.walk\");\r\nFiles.walk(Paths.get(\".\"), 3, FileVisitOption.values())\r\n          .filter(path -&gt; path.toString().startsWith(\".\\\\src\"))\r\n          .forEach(path -&gt; System.out.println(path));\r\n\r\nSystem.out.println(\"\\nFiles.walk 2\");\r\nFiles.walk(Paths.get(\".\"), FileVisitOption.values())\r\n     .filter(path -&gt; path.toString().endsWith(\".java\"))\r\n     .forEach(path -&gt; System.out.println(path));\r\n<\/code><\/pre>\n<h3>\u6587\u4ef6\u67e5\u627e<\/h3>\n<p>\u67e5\u627e\u7684\u529f\u80fd\u5176\u5b9e\u8ddf\u6587\u4ef6\u7684\u904d\u5386\u5dee\u4e0d\u591a\uff0c\u591a\u4e86\u4e00\u4e2a\u5339\u914d\u5668\u3002<\/p>\n<pre><code class=\"java\">System.out.println(\"\\nFiles.find:\");\r\nBiPredicate&lt;Path, BasicFileAttributes&gt; matcher = (path, attr) -&gt; path.endsWith(Paths.get(\"Collec\"));\r\nFiles\r\n          .find(Paths.get(\".\"), 3,  matcher, FileVisitOption.values())\r\n          .forEach(path -&gt; System.out.println(path.toString()));\r\n<\/code><\/pre>\n<h3>UncheckedIOException<\/h3>\n<p>\u7531\u4e8e<code>Iterator\/Stream<\/code>\u7684\u65b9\u6cd5\u7b7e\u540d\u4e0d\u5141\u8bb8\u629b\u51fa<code>IOException<\/code>\uff0c\u5f53\u8fdb\u884cIO\u64cd\u4f5c\u51fa\u73b0\u5f02\u5e38\u65f6\uff0c\u9700\u8981\u901a\u8fc7\u4e0d\u53d7\u68c0\u67e5\u7684\u5f02\u5e38\u7c7b\u6765\u4f20\u9012\u8fd9\u4e2a\u5f02\u5e38\u4fe1\u606f\u3002UncheckedIOException\u5c31\u662f\u505a\u8fd9\u4e2a\u7684\u3002<\/p>\n<p>\u603b\u7684\u6765\u8bf4\uff0cio\u5305\u53d8\u5316\u4e0d\u5927\uff0c\u4e3b\u8981\u662f\u7ed3\u5408Lambda\u8fdb\u884c\u4e00\u4e9b\u6539\u8fdb\uff0c\u5f88\u591aIO\u65b9\u9762\u7684\u6539\u8fdb\u5df2\u7ecf\u5728Java 7\u91cc\u63d0\u4f9b\u4e86\u3002<\/p>\n<hr\/>\n<p>\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u5fae\u4fe1\u516c\u4f17\u53f7: <strong>coderbee\u7b14\u8bb0<\/strong>\uff0c\u53ef\u4ee5\u66f4\u53ca\u65f6\u56de\u590d\u4f60\u7684\u8ba8\u8bba\u3002<br \/>\n<img loading=\"lazy\" decoding=\"async\" width=\"258\" height=\"258\" src=\"https:\/\/coderbee.net\/wp-content\/uploads\/2019\/01\/coderbee-note.jpg\" class=\"alignnone size-full wp-image-1707\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u66f4\u4fbf\u6377\u7684\u6587\u672c\u884c\u5904\u7406 BufferedReader \u63d0\u4f9b\u4e86\u4e00\u4e2alines()\u65b9\u6cd5\u7528 &hellip; <a href=\"https:\/\/coderbee.net\/index.php\/java\/20131030\/543\">\u7ee7\u7eed\u9605\u8bfb <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[91],"_links":{"self":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/543"}],"collection":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/comments?post=543"}],"version-history":[{"count":5,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/543\/revisions"}],"predecessor-version":[{"id":1758,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/543\/revisions\/1758"}],"wp:attachment":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/media?parent=543"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/categories?post=543"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/tags?post=543"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}