{"id":8304,"date":"2022-11-04T13:22:55","date_gmt":"2022-11-04T05:22:55","guid":{"rendered":"http:\/\/123.57.164.21\/?p=8304"},"modified":"2022-11-04T13:22:55","modified_gmt":"2022-11-04T05:22:55","slug":"%e8%bf%98%e6%b2%a1%e6%90%9e%e6%87%82java%e4%b8%ad%e7%9a%84%e8%b7%af%e5%be%84%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/92it.top\/?p=8304","title":{"rendered":"\u8fd8\u6ca1\u641e\u61c2Java\u4e2d\u7684\u8def\u5f84\uff1f"},"content":{"rendered":"\n

\u4e00\u3001\u524d\u8a00<\/strong><\/p>\n\n\n\n

\n\n\n\n

\u4e4b\u524d\u4e00\u76f4\u5bf9\u4e8ejava\u4e2d\u7684\u8def\u5f84\u662f\u6a21\u68f1\u4e24\u53ef\u7684\u611f\u89c9\uff0c\u5bf9\u8fd9\u4e00\u5757\uff0c\u770b\u4f3c\u77e5\u9053\uff0c\u5176\u5b9e\u4e5f\u4e0d\u77e5\u9053\u3002\u6bcf\u6b21\u9047\u5230FileNotFound\u7684\u65f6\u5019\u5c31\u4f1a\u53bbGoogle\u53bb\u67e5\u8be2\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u600e\u4e48\u7528\u54c7\uff0c\u5230\u5e95\u76f8\u5bf9\u8def\u5f84\u6307\u7684\u662f\u4ece\u54ea\u5f00\u59cb\u7684\u8def\u5f84\u5440\uff0c\u7b49\u7b49\u95ee\u9898\uff01\u5176\u5b9e\u5c31\u662f\u5728\u8499\u7b54\u6848\uff0c\u6309\u7167\u7f16\u7a0b\u4e2d\u7684\u8bf4\u6cd5\u5c31\u662f\u649e\u5927\u8fd0\u5f0f\u7684\u7f16\u7a0b\uff0c\u8fd9\u6b21\u4e89\u53d6\u4e00\u6b21\u6027\u7684\u641e\u61c2java\u4e2d\u7684\u8def\u5f84\u95ee\u9898\uff0c\u4e89\u53d6\u4ee5\u540e\u7f16\u7a0b\u5fc3\u4e2d\u6709\u4e18\u58d1\u3002<\/p>\n\n\n\n

\u4e8c\u3001\u76f8\u5bf9\u8def\u5f84\u548c\u7edd\u5bf9\u8def\u5f84<\/strong><\/p>\n\n\n\n

\n\n\n\n

\u300c\u7edd\u5bf9\u8def\u5f84\uff1a\u300d<\/strong> \u7edd\u5bf9\u8def\u5f84\u7684\u82f1\u6587\u5168\u79f0\u662fAbsolute Path\uff0c\u5c31\u662f\u771f\u5b9e\u7684\u8def\u5f84,\u662f\u8ba1\u7b97\u673a\u4e2d\u5b8c\u6574\u8def\u5f84,\u5fc5\u987b\u51c6\u786e,\u5426\u5219\u4e0d\u80fd\u627e\u5230,\u8d77\u70b9\u662f\u7cfb\u7edf\u7684\u6839\u76ee\u5f55,\u4e5f\u5c31\u662f\u5404\u4e2a\u76d8\u7b26<\/p>\n\n\n\n

\u76f8\u5bf9\u8def\u5f84\uff1a\u300d<\/strong> \u6240\u8c13\u76f8\u5bf9\u8def\u5f84\uff0c\u5c31\u662f\u76f8\u5bf9\u4e8e\u81ea\u5df1\u7684\u76ee\u6807\u6587\u4ef6\u4f4d\u7f6e\u3002\u4f46\u662f\u76f8\u5bf9\u8def\u5f84\u6700\u91cd\u8981\u662f\u76f8\u5bf9\u7684\u6982\u5ff5\uff0c\u5230\u5e95\u76f8\u5bf9\u7684\u662f\u9879\u76ee\u7684\u6839\u76ee\u5f55\u8fd8\u662fclasspath\u76ee\u5f55 \u8fd9\u6837\u8bf4\u4e86\u53ef\u80fd\u611f\u89c9\u4e0d\u5927\uff0c\u90a3\u4e0b\u9762\u5c31\u4e3e\u51fa\u4e00\u4e2a\u5177\u4f53\u7684\u4f8b\u5b50\u6765\u8bf4\u660e\u4ec0\u4e48\u662f\u7edd\u5bf9\u8def\u5f84\uff0c\u4ec0\u4e48\u662f\u76f8\u5bf9\u8def\u5f84<\/p>\n\n\n\n

\u90a3\u4e48javaIO\u6a21\u5757\u4e0b\u7684resoure\u76ee\u5f55\u4e0b\u7684 a.txt\u6587\u4ef6\uff0c\u5b83\u7684\u7edd\u5bf9\u8def\u5f84\u548c\u76f8\u5bf9\u8def\u5f84\u5982\u4e0b\uff1a<\/p>\n\n\n\n

\u300c\u7edd\u5bf9\u8def\u5f84\uff1a\u300d<\/strong> D:\\code\\River\\JavaSE\\javaIO\\src\\main\\resources\\a.txt<\/p>\n\n\n\n

\u300c\u76f8\u5bf9\u8def\u5f84\uff1a\u300d<\/strong> \u76f8\u5bf9\u4e8e\u9879\u76ee\u7684\u6839\u8def\u5f84\u662f\uff1aclasspath(\u4e5f\u5c31\u662f \u300ctarget\/classes\u300d<\/strong> )<\/p>\n\n\n\n

\u4e09\u3001File\u7c7b\u4e2d\u7684\u8def\u5f84<\/strong><\/p>\n\n\n\n

\n\n\n\n

\u5728project\u4e2d\uff0c\u76f8\u5bf9\u8def\u5f84\u7684\u6839\u76ee\u5f55\u662fproject\u7684\u6839\u6587\u4ef6\u5939\uff0c\u521b\u5efa\u6587\u4ef6\u7684\u5199\u6cd5\u662f\uff1a<\/p>\n\n\n\n

\u300c\u76f8\u5bf9\u8def\u5f84\uff1a\u300d<\/strong> D:\\code\\River\\JavaSE\uff08\u4e5f\u5c31\u662f\u5de5\u7a0b\u7684\u76f8\u5bf9\u8def\u5f84\uff09\uff0c\u6ce8\u610f\u8def\u5f84\u4e0d\u80fd\u4ee5”\/”\u5f00\u5934<\/p>\n\n\n\n

private static void filePath() {\n        File file = new File(\"javaIO\/src\/main\/java\/org\/huanghe\/stream\/Java\u4e2d\u5b57\u7b26\u6d41\u4e0e\u5b57\u8282\u6d41\u7684\u533a\u522b.md\");\n        System.out.println(file.exists());\n        System.out.println(System.getProperty(\"user.dir\"));\n    }<\/pre>\n\n\n\n
\u300c\u7edd\u5bf9\u8def\u5f84\uff1a\u300d<\/strong><\/p>\n\n\n\n
private static void filePath() {\n        File file = new File(\"D:\\code\\River\\JavaSE\\javaIO\\src\\main\\java\\org\\huanghe\\stream\\Java\u4e2d\u5b57\u7b26\u6d41\u4e0e\u5b57\u8282\u6d41\u7684\u533a\u522b.md\");\n        System.out.println(file.exists());\n        System.out.println(System.getProperty(\"user.dir\"));\n    }<\/pre>\n\n\n\n
\u56db\u3001\u83b7\u53d6\u6587\u4ef6\u7684\u8def\u5f84class.getResource\u548cclass.getClassLoader<\/strong><\/p>\n\n\n\n
\n\n\n\n
\u5728\u6211\u4eecJava\u5f00\u53d1\u4e2d\u5f80\u5f80\u9700\u8981\u53bb\u83b7\u53d6\u6587\u4ef6\u4e2d\u7684\u5185\u5bb9\uff0c\u4e00\u822c\u7684\u6211\u4eec\u4f1a\u4f7f\u7528File\u7684\u5f62\u5f0f\u83b7\u53d6\uff0c\u5982\uff1a\u6211\u8981\u83b7\u53d6\u201cc:\\\u6587\u4ef6.txt\u201d\u6b64\u65f6\u6211\u4eec\u9700\u8981\u521b\u5efa\u4e00\u4e2aFile\u7684\u5bf9\u8c61File file=new FIle(“c:\\\u6587\u4ef6txt”);<\/p>\n\n\n\n
\u7136\u540e\u5728\u4f7f\u7528file\u7c7b\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6\u6587\u4ef6\u8f93\u5165\u6d41 \uff1aFileInputStream in =new FileInputStream(file)\uff0c\u7136\u540e\u518d\u662f\u4f7f\u7528\u8be5\u8f93\u5165\u6d41\u8fdb\u884c\u6211\u4eec\u60f3\u8981\u7684\u64cd\u4f5c\uff0c\u4f46\u662f\u8fd9\u6837\u6709\u4e00\u4e2a\u5f0a\u7aef\uff0c\u5c31\u662f\u6211\u4eec\u7684\u6587\u4ef6\u8def\u5f84\u662f\u4e00\u79cd\u786c\u7f16\u7801\u7684\u5f62\u5f0f\uff0c\u5728Java\u7f16\u7801\u8fc7\u7a0b\u4e2d\u6211\u4eec\u6781\u5176\u4e0d\u63a8\u8350\u8fd9\u79cd\u5199\u6cd5<\/p>\n\n\n\n
\u5f53\u7136\u5728web\u9879\u76ee\u4e0b\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7application\u5bf9\u8c61\u7684getRealPath(\u201c\u6587\u4ef6\u540d\u201d)\u7684\u65b9\u5f0f\u83b7\u53d6\u6587\u4ef6\u7684\u7edd\u5bf9\u8def\u5f84\uff0c\u4f46\u662f\u8fd9\u6837\u4e5f\u4e0d\u662f\u5f88\u63a8\u8350\uff0c\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528class.getResource(path)\u548cclass.getClassLoader(path)\u65b9\u6cd5\u6765\u83b7\u53d6\u6587\u4ef6\u8d44\u6e90\uff0c\u90a3\u4e48\u6211\u4eec\u6765\u7814\u7a76\u4e00\u4e0b\u4e24\u8005\u7684\u533a\u522b\uff1a<\/p>\n\n\n\n
4.1 class.getResource(path)<\/strong><\/p>\n\n\n\n
\u5176\u4e2d\u7684\u53c2\u6570path\u6709\u4e24\u79cd\u5f62\u5f0f\uff0c\u4e00\u79cd\u662f\u4ee5\u201c\/\u201d\u5f00\u5934\u7684\uff0c\u53e6\u4e00\u79cd\u662f\u4e0d\u4ee5”\/”\u5f00\u5934\uff1b<\/p>\n\n\n\n
  • \u300c\u4ee5’\/’\u5f00\u5934\u7684\u8868\u793a\u300d<\/strong>\uff1a\u4ece\u9879\u76ee\u7684\u6839\u8def\u5f84\u4e0b\u53bb\u83b7\u53d6\u6587\u4ef6\u5373classPath\u76ee\u5f55\u4e0b<\/li>
  • **\u4e0d\u4ee5”\/”\u5f00\u5934\uff1a**\u4ee5\u8be5\u7c7b\u5bf9\u8c61\u6240\u5728\u4f4d\u7f6e\u4e3a\u6839\u8def\u5f84\u6765\u8fdb\u884c\u67e5\u627e\u7684<\/li><\/ul>\n\n\n\n
    \/**\n     * \u6d4b\u8bd5class.getResource\u83b7\u53d6\u6587\u4ef6\u8def\u5f84\n     *\/\n    public static void testClassGetResource() {\n        System.out.println(_01_JavaFilePath.class.getResource(\"\"));\n        System.out.println(_01_JavaFilePath.class.getResource(\"\/\"));\n    }<\/pre>\n\n\n\n
    \u8f93\u51fa\u7684\u7ed3\u679c\u4e3a\uff1a<\/p>\n\n\n\n
    file:\/D:\/Code\/JavaSE\/io\/target\/classes\/com\/huanghe\/chapter\/  : \u8fd4\u56de\u7684\u662f testClassGetResource.class\u8fd9\u4e2a\u7c7b\u6240\u5728\u7684\u76ee\u5f55\nfile:\/D:\/Code\/JavaSE\/io\/target\/classes\/ : \u8fd4\u56de\u7684\u662f \u9879\u76ee\u7684classpath\u76ee\u5f55\u7684\u8def\u5f84<\/pre>\n\n\n\n
    \u5047\u8bbe\u73b0\u5728\u7684\u9879\u76ee\u7ed3\u6784\u5982\u4e0b\u6240\u793a\uff0c\u9488\u5bf9\u4e0b\u9762\u7684\u4e09\u79cd\u60c5\u51b5\u5982\u4f55\u83b7\u53d6\uff1a<\/p>\n\n\n\n
    \u83b7\u53d6\u4e0a\u56fe\u6240\u793a\u7684\u4e09\u79cd\u6587\u4ef6\u7684\u65b9\u6cd5\uff1a<\/p>\n\n\n\n
    \/**\n     * \u6d4b\u8bd5class.getResource\u83b7\u53d6\u6587\u4ef6\u8def\u5f84\n     *\/\n    public static void testClassGetResource2() {\n        System.out.println(_01_JavaFilePath.class.getResource(\"file\/test.properties\"));\n        System.out.println(_01_JavaFilePath.class.getResource(\"..\/txt\/01-java-filepath.txt\"));\n        System.out.println(_01_JavaFilePath.class.getResource(\"\/01-java-filepath.txt\"));\n    }<\/pre>\n\n\n\n
    \u8f93\u51fa\u7684\u7ed3\u679c\u4e3a\uff1a<\/p>\n\n\n\n
    file:\/D:\/Code\/JavaSE\/io\/target\/classes\/com\/huanghe\/chapter\/one\/file\/test.properties\n\nfile:\/D:\/Code\/JavaSE\/io\/target\/classes\/com\/huanghe\/chapter\/txt\/01-java-filepath.txt\n\nfile:\/D:\/Code\/JavaSE\/io\/target\/classes\/\/01-java-filepath.txt<\/pre>\n\n\n\n
    :class.getResource()\u548cclass.getResourceAsStream()\u65b9\u5f0f\u7684\u4f7f\u7528\u5728\u8def\u5f84\u4e0a\u662f\u4e00\u81f4\u7684\u3002<\/p>\n\n\n\n
    4.2 Class.getClassLoader().getResource(String path)<\/strong><\/p>\n\n\n\n
    \u8be5\u65b9\u6cd5\u4e2d\u7684\u53c2\u6570path\u4e0d\u80fd\u4ee5\u201c\/\u201c\u5f00\u5934\uff0cpath\u8868\u793a\u7684\u662f\u4ececlasspath\u4e0b\u83b7\u53d6\u8d44\u6e90\u7684<\/p>\n\n\n\n
    package testpackage;\npublic class TestMain {\n    public static void main(String[] args) {\n        TestMain t = new TestMain();\n        System.out.println(t.getClass());\n        System.out.println(t.getClass().getClassLoader());\n        System.out.println(t.getClass().getClassLoader().getResource(\"\"));\n        System.out.println(t.getClass().getClassLoader().getResource(\"\/\"));\/\/null\n    }\n}<\/pre>\n\n\n\n
    \u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n\n\n\n
    1. class testpackage.TestMain\n2. sun.misc.Launcher$AppClassLoader@1fb8ee3\n3. file:\/D:\/Code\/JavaSE\/io\/target\/classes\n4. null<\/pre>\n\n\n\n
    \u4e94\u3001\u603b\u7ed3<\/strong><\/p>\n\n\n\n
    \n\n\n\n
    • \u4f7f\u7528\u5de5\u7a0b\u76f8\u5bf9\u8def\u5f84\u662f\u9760\u4e0d\u4f4f\u7684<\/li>
    • \u4f7f\u7528CLASSPATH\u8def\u5f84\u662f\u53ef\u9760\u7684\u3002<\/li>
    • \u5bf9\u4e8e\u7a0b\u5e8f\u8981\u8bfb\u53d6\u7684\u6587\u4ef6\uff0c\u5c3d\u53ef\u80fd\u653e\u5230CLASSPATH\u4e0b\uff0c\u8fd9\u6837\u5c31\u80fd\u4fdd\u8bc1\u5728\u5f00\u53d1\u548c\u53d1\u5e03\u65f6\u5019\u5747\u6b63\u5e38\u8bfb\u53d6\u3002<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"
      \u4e00\u3001\u524d\u8a00 \u4e4b\u524d\u4e00\u76f4\u5bf9\u4e8ejava\u4e2d\u7684\u8def\u5f84\u662f\u6a21\u68f1\u4e24\u53ef\u7684\u611f\u89c9\uff0c\u5bf9\u8fd9\u4e00\u5757\uff0c\u770b\u4f3c\u77e5\u9053\uff0c\u5176\u5b9e\u4e5f\u4e0d\u77e5\u9053\u3002\u6bcf\u6b21\u9047\u5230FileNo […]<\/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\/8304"}],"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=8304"}],"version-history":[{"count":1,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/8304\/revisions"}],"predecessor-version":[{"id":8305,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/8304\/revisions\/8305"}],"wp:attachment":[{"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=8304"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=8304"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=8304"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}