{"id":8298,"date":"2022-11-04T13:14:51","date_gmt":"2022-11-04T05:14:51","guid":{"rendered":"http:\/\/123.57.164.21\/?p=8298"},"modified":"2022-11-04T13:14:51","modified_gmt":"2022-11-04T05:14:51","slug":"java%e4%b8%ad%e7%9a%84%e6%96%87%e4%bb%b6%e8%b7%af%e5%be%84","status":"publish","type":"post","link":"https:\/\/92it.top\/?p=8298","title":{"rendered":"Java\u4e2d\u7684\u6587\u4ef6\u8def\u5f84"},"content":{"rendered":"\n<p>\u901a\u8fc7\u8def\u5f84\u8bfb\u6587\u4ef6\u4e00\u822c\u5c313\u79cd\u65b9\u5f0f\uff0c\u4f46\u4ed6\u4eec\u5b8c\u5168\u4e0d\u540c\uff1a<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<pre class=\"wp-block-preformatted\">1. File myFile=new File(\"myfile.txt\");<\/pre>\n\n\n\n<p>\u4e0a\u9762\u8fd9\u4e48\u5199\u662f\u4ece\u5f53\u524d\u8def\u5f84\u8bfb\u6587\u4ef6\uff0c\u5f53\u524d\u8def\u5f84\u6307\u542f\u52a8\u5f53\u524dJava\u8fdb\u7a0b\u7684\u8def\u5f84\uff0c\u4e0d\u540c\u7684\u60c5\u51b5\u8fd9\u4e2a\u8def\u5f84\u90fd\u4e0d\u4e00\u6837\uff0c\u5728Eclipse\u91cc\u4e00\u822c\u662f\u5f53\u524d\u9879\u76ee\u7684\u8def\u5f84\uff0c\u5728 Servlet\u91cc\u4e00\u822c\u5c31\u662fServlet\u5bb9\u5668\u7684\u8def\u5f84\u3002<strong>\u5728Java\u4e2d\u76f8\u5bf9\u8def\u5f84\uff0c\u76f8\u5bf9\u7684\u662fJVM\u7684\u542f\u52a8\u8def\u5f84\uff0c\u800c\u4e00\u822c\u6765\u8bf4\u5c31\u662f\u5728\u9879\u76ee\u540d\u79f0\u4e0b\u542f\u52a8\u7684\u3002<\/strong><\/p>\n\n\n\n<p>\u8fd9\u4e2a\u8def\u5f84\u7684\u7edd\u5bf9\u503c\u53ef\u4ee5\u901a\u8fc7System.getProperty(&#8220;user.dir&#8221;))\u53d6\u5230\u3002<\/p>\n\n\n\n<p>\u8fd9\u4e2a\u65b9\u6cd5\u540c\u65f6\u53ef\u4ee5\u901a\u8fc7\u7edd\u5bf9\u8def\u5f84\u53d6\u6587\u4ef6\uff0c<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">File myFile=new File(\"D:\\temp\\myfile.txt\");\nFile myFile=new File(\"\/usr\/user1\/myfile.txt\");<\/pre>\n\n\n\n<p>\u53e6\u4e00\u4e2a\u4f8b\u5b50<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" src=\"http:\/\/123.57.164.21\/wp-content\/uploads\/2022\/11\/\u56fe\u7247-80.png\" alt=\"\" class=\"wp-image-8300\" width=\"-282\" height=\"-154\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2022\/11\/\u56fe\u7247-80.png 630w, https:\/\/92it.top\/wp-content\/uploads\/2022\/11\/\u56fe\u7247-80-300x164.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2022\/11\/\u56fe\u7247-80-230x126.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2022\/11\/\u56fe\u7247-80-350x191.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2022\/11\/\u56fe\u7247-80-480x262.png 480w\" sizes=\"(max-width: 630px) 100vw, 630px\" \/><\/figure><\/div>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class Demo1 {\n\n    public static void main(String[] args) throws Exception{\n        File f1 = new File(\"test1.txt\");\n        File f2 = new File(\".\/test2.txt\");\n        File f3 = new File(\"src\/test3.txt\");\n        File f4 = new File(\"test4.txt\");\n        System.out.println(f1.exists()+\":\"+f1.getCanonicalPath());\n        System.out.println(f2.exists()+\":\"+f2.getCanonicalPath());\n        System.out.println(f3.exists()+\":\"+f3.getCanonicalPath());\n        System.out.println(f4.exists()+\":\"+f4.getCanonicalPath());\n    }\n\n}<\/pre>\n\n\n\n<p>\u8f93\u51fa\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">true:D:\\spam\\path\\test1.txt\ntrue:D:\\spam\\path\\test2.txt\ntrue:D:\\spam\\path\\src\\test3.txt\nfalse:D:\\spam\\path\\test4.txt<\/pre>\n\n\n\n<p>\u8bf4\u660e\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\u2460\u4ece\u793a\u4f8b\u4e2d\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u6240\u6709\u7684\u6587\u4ef6\u90fd\u662f\u76f8\u5bf9\u4e8eD:\\spam\\path\u8fd9\u4e2a\u8def\u5f84\u5efa\u7acb\u7684\u3002\n\n\u2461\".\/test2\"\u4e0e\"test1\"\u8868\u793a\u7684\u90fd\u662f\u4e00\u6837\u7684\u8bed\u4e49\uff0c\u76f8\u5bf9\u4e0e\u5f53\u524dJVM\u7684\u542f\u52a8\u76ee\u5f55\n\n\u2462\"..\/test\"\u8868\u793a\u76f8\u5bf9\u4e8e\u5f53\u524d\u76ee\u5f55\u7684\u4e0a\u4e00\u7ea7\u76ee\u5f55\n\n\u2463test4\u544a\u8bc9\u6211\u4eecFile\u7684\u8bed\u4e49\u8868\u793a\u7684\u4ec5\u4ec5\u662f\u4e00\u4e2a\u8def\u5f84<\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<pre class=\"wp-block-preformatted\">2. InputStream myFileStream = this.getClass().getResourceAsStream(\"myfile.txt\");<\/pre>\n\n\n\n<p>\u4ece\u5f53\u524d\u7c7b\u6240\u5728\u8def\u5f84\u8bfb\u6587\u4ef6, myfile.txt\u5e94\u8be5\u662f\u548c\u5f53\u524d\u8fd9\u4e2a\u7c7b\u5728\u540c\u4e00\u4e2a\u76ee\u5f55\u4e2d\u7684\u6587\u4ef6\u3002\u5982\u679c\u8def\u5f84\u524d\u653e\u4e86\u4e2a&#8221;\/&#8221;, \u5982this.getClass().getResourceAsStream(&#8220;\/myfile.txt&#8221;)\uff0c\u90a3\u5c31\u662f\u4ece\u5f53\u524dclasspath\u5f00\u59cb\u8bfb\u4e86<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<pre class=\"wp-block-preformatted\">3.InputStream myFileStream = this.getClass().getClassLoader().getResourceAsStream(\"myfile.txt\");<\/pre>\n\n\n\n<p>\u8fd9\u4e2a\u5bb9\u6613\u548c\u7b2c2\u79cd\u6df7\u6dc6\uff0c\u5b83\u662f\u6307\u4ececlasspath\u5f00\u59cb\u627e\u6587\u4ef6\uff0c\u524d\u9762\u52a0\u4e0d\u52a0&#8221;\/&#8221;\u90fd\u4e00\u6837\uff0c\u5176\u5b9e\u5b83\u76f8\u5f53\u4e0ethis.getClass().getResourceAsStream(&#8220;\/myfile.txt&#8221;), \u4e0e\u8fd9\u4e2a\u6709\u76f8\u540c\u6548\u679c\u7684\u8fd8\u6709<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">Thread.currentThread().getContextClassLoader().getResourceAsStream(\"myfile.txt\")\u6216\n\nThread.currentThread().getContextClassLoader().getResourceAsStream(\"\/myfile.txt\")\n\nClassLoader.getSystemResource(\"myfile.txt\")\u6216\n\nClassLoader.getSystemResource(\"\/myfile.txt\")\n<\/pre>\n\n\n\n<p>\u4e0b\u9762\u8fd9\u4e2a\u4ee3\u7801<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">package com.test.path;\n\nimport java.io.File;\n\nclass TestPath {\n\n\tpublic static void main(String[] args) throws Exception {\n\n\t\tSystem.out.println(Thread.currentThread().getContextClassLoader().getResource(\"\"));\n\n\t\tSystem.out.println(TestPath.class.getClassLoader().getResource(\"\"));\n\n\t\tSystem.out.println(ClassLoader.getSystemResource(\"\"));\n\n\t\tSystem.out.println(TestPath.class.getClassLoader().getResource(\"\"));\n\n\t\tSystem.out.println(TestPath.class.getResource(\"\"));\n\n\t\tSystem.out.println(TestPath.class.getResource(\"\/\"));\n\n\t\tSystem.out.println(new File(\"\").getAbsolutePath());\n\n\t\tSystem.out.println(System.getProperty(\"user.dir\"));\n\n\t}\n\n}<\/pre>\n\n\n\n<p>\u5b83\u7684\u8f93\u51fa:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">file:\/C:\/TestArena\/bin\/\n\nfile:\/C:\/TestArena\/bin\/\n\nfile:\/C:\/TestArena\/bin\/\n\nfile:\/C:\/TestArena\/bin\/\n\nfile:\/C:\/TestArena\/bin\/com\/test\/path\/\n\nfile:\/C:\/TestArena\/bin\/\n\nC:\\TestArena\n\nC:\\TestArena<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u901a\u8fc7\u8def\u5f84\u8bfb\u6587\u4ef6\u4e00\u822c\u5c313\u79cd\u65b9\u5f0f\uff0c\u4f46\u4ed6\u4eec\u5b8c\u5168\u4e0d\u540c\uff1a 1. File myFile=new File(&#8220;myfile [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"_links":{"self":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/8298"}],"collection":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=8298"}],"version-history":[{"count":4,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/8298\/revisions"}],"predecessor-version":[{"id":8303,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/8298\/revisions\/8303"}],"wp:attachment":[{"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=8298"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=8298"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=8298"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}