{"id":31710,"date":"2024-01-21T07:35:33","date_gmt":"2023-06-27T04:43:46","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java%ef%bc%9a%e9%81%8d%e5%8e%86%e7%9b%ae%e5%bd%95\/"},"modified":"2024-05-04T19:25:41","modified_gmt":"2024-05-04T11:25:41","slug":"java%ef%bc%9a%e9%81%8d%e5%8e%86%e7%9b%ae%e5%bd%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%ef%bc%9a%e9%81%8d%e5%8e%86%e7%9b%ae%e5%bd%95\/","title":{"rendered":"Java\uff1a\u904d\u5386\u76ee\u5f55"},"content":{"rendered":"<h1>\u9996\u5148<\/h1>\n<p>\u4f7f\u7528Java nio\u4e2d\u5f15\u5165\u7684walkFileTree\u65b9\u6cd5\uff0c\u53ef\u4ee5\u8f7b\u677e\u5730\u904d\u5386\u76ee\u5f55\u3002\u6211\u5c06\u5199\u4e00\u7bc7\u6587\u7ae0\u6765\u4ecb\u7ecd\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u8bf4\u5b83\u591a\u4e48\u65b9\u4fbf\u3002<br \/>\n&#8230;<br \/>\n\u55ef\uff0c\u867d\u7136\u6211\u5df2\u7ecf\u975e\u5e38\u6e05\u695a\u73b0\u5728\u8fd9\u4e48\u8bf4\u6709\u70b9\u665a\u4e86\uff0c\u4f46\u662f\u7531\u4e8e\u6211\u7684\u804c\u573a\u4e0a\u4f7f\u7528\u7684JRE\u7248\u672c\u4ecd\u7136\u662f1.6\u6807\u51c6\uff0c\u6240\u4ee5\u5728\u6587\u4ef6\u5904\u7406\u65b9\u9762\u6211\u4ecd\u7136\u4f7f\u7528Java.io\u7c7b\u3002<br \/>\n\u81ea\u5df1\u5b9e\u73b0\u4e86walkFileTree\u65b9\u6cd5\u4e2d\u7684Visitor\u5904\u7406\u903b\u8f91\uff0c\u771f\u7684\u8ba9\u4eba\u5f88\u5fc3\u7d2f&#8230;<\/p>\n<h1>\u6211\u60f3\u505a\u7684\u4e8b\u60c5 (W\u01d2 zu\u00f2 de<\/h1>\n<p>\u4eceC:\/Java\/jdk1.8.0_102\/src\u63d0\u53d6\u51faC:\/Java\/jdk1.8.0_102\/src\/javax\/script\u4e2d\u7684Java\u6587\u4ef6\u4e2d\u7684\u516c\u5171\u7c7b<br \/>\n\u63d0\u53d6\u516c\u5171\u7c7b\u662f\u901a\u8fc7\u5b9a\u5236\u529f\u80fd\u6587\u7ae0\u4e2d\u63d0\u5230\u7684\u6e90\u4ee3\u7801\u6765\u5b8c\u6210\u7684\u3002<\/p>\n<h1>\u4f20\u9012\u7ed9walkFileTree\u7684Visitor\u5b9e\u73b0<\/h1>\n<p>\u6bcf\u5f53\u6211\u4eec\u5b9e\u73b0FileVisitor\u63a5\u53e3\u65f6\uff0c\u9700\u8981\u91cd\u5199\u5176\u4e2d\u5b9a\u4e49\u7684\u65b9\u6cd5\u3002\u91cd\u70b9\u662f<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u623b\u308a\u5024\u3067null\u3092\u8fd4\u3059\u3068\u4e88\u671f\u305b\u306c\u3068\u3053\u308d\u3067NullPointerException\u304c\u767a\u751f\u3059\u308b\u306e\u3067\u3001FileVisitResult\u3092\u8fd4\u3059\u3053\u3068<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">preVisitDirectory\u3092\u6d3b\u7528\u3057\u3066\u7121\u99c4\u306a\u30d5\u30a1\u30a4\u30eb\u306e\u5165\u51fa\u529b\u3092\u6291\u6b62\u3059\u308b\u3053\u3068<\/ul>\n<p>\u662f\u5417\uff1f<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">package<\/span> <span class=\"nn\">triple<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.io.IOException<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.nio.file.FileVisitResult<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.nio.file.FileVisitor<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.nio.file.Files<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.nio.file.Path<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.nio.file.Paths<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.nio.file.attribute.BasicFileAttributes<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">DirectroyWalkVistor<\/span>  <span class=\"kd\">implements<\/span> <span class=\"nc\">FileVisitor<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Path<\/span><span class=\"o\">&gt;{<\/span>\r\n    <span class=\"kd\">private<\/span> <span class=\"kd\">static<\/span> <span class=\"kd\">final<\/span> <span class=\"nc\">String<\/span> <span class=\"no\">DIRECTORY_ON_TARGET<\/span> <span class=\"o\">=<\/span><span class=\"s\">\"C:\/Java\/jdk1.8.0_102\/src\/javax\/script\"<\/span><span class=\"o\">;<\/span>\r\n\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"n\">args<\/span><span class=\"o\">[])<\/span> <span class=\"kd\">throws<\/span> <span class=\"nc\">Exception<\/span><span class=\"o\">{<\/span>\r\n        <span class=\"nc\">Files<\/span><span class=\"o\">.<\/span><span class=\"na\">walkFileTree<\/span><span class=\"o\">(<\/span><span class=\"nc\">Paths<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span><span class=\"o\">(<\/span><span class=\"s\">\"C:\/Java\/jdk1.8.0_102\/src\"<\/span><span class=\"o\">),<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">DirectroyWalkVistor<\/span><span class=\"o\">());<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"nd\">@Override<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"nc\">FileVisitResult<\/span> <span class=\"nf\">postVisitDirectory<\/span><span class=\"o\">(<\/span><span class=\"nc\">Path<\/span> <span class=\"n\">file<\/span> <span class=\"o\">,<\/span> <span class=\"nc\">IOException<\/span> <span class=\"n\">arg1<\/span><span class=\"o\">)<\/span> <span class=\"kd\">throws<\/span> <span class=\"nc\">IOException<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"nc\">FileVisitResult<\/span><span class=\"o\">.<\/span><span class=\"na\">CONTINUE<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"nd\">@Override<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"nc\">FileVisitResult<\/span> <span class=\"nf\">preVisitDirectory<\/span><span class=\"o\">(<\/span><span class=\"nc\">Path<\/span> <span class=\"n\">file<\/span><span class=\"o\">,<\/span> <span class=\"nc\">BasicFileAttributes<\/span> <span class=\"n\">arg1<\/span><span class=\"o\">)<\/span> <span class=\"kd\">throws<\/span> <span class=\"nc\">IOException<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">if<\/span><span class=\"o\">(<\/span><span class=\"nc\">Paths<\/span><span class=\"o\">.<\/span><span class=\"na\">get<\/span><span class=\"o\">(<\/span><span class=\"no\">DIRECTORY_ON_TARGET<\/span><span class=\"o\">).<\/span><span class=\"na\">startsWith<\/span><span class=\"o\">(<\/span><span class=\"n\">file<\/span><span class=\"o\">)){<\/span>\r\n            <span class=\"c1\">\/\/C:\/Java\/jdk1.8.0_102\/src\/javax\/script\u306b\u90e8\u5206\u4e00\u81f4\u3059\u308b\u3068\u304d\u306f\u51e6\u7406\u3092\u7d9a\u3051\u308b<\/span>\r\n            <span class=\"k\">return<\/span> <span class=\"nc\">FileVisitResult<\/span><span class=\"o\">.<\/span><span class=\"na\">CONTINUE<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"o\">}<\/span><span class=\"k\">else<\/span><span class=\"o\">{<\/span>\r\n            <span class=\"c1\">\/\/C:\/Java\/jdk1.8.0_102\/src\/javax\/script\u306b\u90e8\u5206\u4e00\u81f4\u3057\u306a\u3044\u6642\u306f\u30b5\u30d6\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306e\u51e6\u7406\u3092\u30b9\u30ad\u30c3\u30d7\u3059\u308b<\/span>\r\n            <span class=\"k\">return<\/span> <span class=\"nc\">FileVisitResult<\/span><span class=\"o\">.<\/span><span class=\"na\">SKIP_SUBTREE<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"o\">}<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"nd\">@Override<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"nc\">FileVisitResult<\/span> <span class=\"nf\">visitFile<\/span><span class=\"o\">(<\/span><span class=\"nc\">Path<\/span> <span class=\"n\">file<\/span><span class=\"o\">,<\/span> <span class=\"nc\">BasicFileAttributes<\/span> <span class=\"n\">arg1<\/span><span class=\"o\">)<\/span> <span class=\"kd\">throws<\/span> <span class=\"nc\">IOException<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">try<\/span><span class=\"o\">{<\/span>\r\n            <span class=\"nc\">JavaFileAnalyser<\/span><span class=\"o\">.<\/span><span class=\"na\">execute<\/span><span class=\"o\">(<\/span><span class=\"n\">file<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"o\">}<\/span><span class=\"k\">catch<\/span><span class=\"o\">(<\/span><span class=\"nc\">Exception<\/span> <span class=\"n\">e<\/span><span class=\"o\">){<\/span>\r\n            <span class=\"k\">throw<\/span> <span class=\"k\">new<\/span> <span class=\"nf\">IOException<\/span><span class=\"o\">(<\/span><span class=\"n\">e<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"o\">}<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"nc\">FileVisitResult<\/span><span class=\"o\">.<\/span><span class=\"na\">CONTINUE<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"nd\">@Override<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"nc\">FileVisitResult<\/span> <span class=\"nf\">visitFileFailed<\/span><span class=\"o\">(<\/span><span class=\"nc\">Path<\/span> <span class=\"n\">file<\/span><span class=\"o\">,<\/span> <span class=\"nc\">IOException<\/span> <span class=\"n\">arg1<\/span><span class=\"o\">)<\/span> <span class=\"kd\">throws<\/span> <span class=\"nc\">IOException<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"n\">arg1<\/span><span class=\"o\">.<\/span><span class=\"na\">printStackTrace<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"nc\">FileVisitResult<\/span><span class=\"o\">.<\/span><span class=\"na\">CONTINUE<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h1>\u5370\u8c61<\/h1>\n<p>\u975e\u5e38\u6709\u8da3\uff01\u8fd9\u53e5\u8bdd\u53ef\u4ee5\u7528\u6765\u5f62\u5bb9\u5b83\u3002<br \/>\n\u7531\u4e8e\u4e0d\u9700\u8981\u7e41\u7410\u7684\u5faa\u73af\u6216\u9012\u5f52\u5904\u7406\u6587\u4ef6\u5939\uff0c\u903b\u8f91\u53d8\u5f97\u975e\u5e38\u7b80\u5355\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9996\u5148 \u4f7f\u7528Java nio\u4e2d\u5f15\u5165\u7684walkFileTree\u65b9\u6cd5\uff0c\u53ef\u4ee5\u8f7b\u677e\u5730\u904d\u5386\u76ee\u5f55\u3002\u6211\u5c06\u5199\u4e00\u7bc7\u6587\u7ae0\u6765\u4ecb\u7ecd\u8fd9\u4e2a\u65b9 [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-31710","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java\uff1a\u904d\u5386\u76ee\u5f55 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/java\uff1a\u904d\u5386\u76ee\u5f55\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\uff1a\u904d\u5386\u76ee\u5f55\" \/>\n<meta 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