{"id":609,"date":"2021-02-06T21:25:18","date_gmt":"2021-02-06T13:25:18","guid":{"rendered":"https:\/\/www.52dixiaowo.com\/java\/?p=609"},"modified":"2021-02-07T15:22:26","modified_gmt":"2021-02-07T07:22:26","slug":"file-%e6%96%87%e4%bb%b6%e7%b1%bb","status":"publish","type":"post","link":"https:\/\/www.52dixiaowo.com\/java\/post-609.html","title":{"rendered":"File — \u6587\u4ef6\u7c7b"},"content":{"rendered":"\n

File \u7c7b\u662f\u64cd\u4f5c\u6587\u4ef6\u7684\u7c7b\uff0c\u5fc5\u987b\u901a\u8fc7\u6b64\u7c7b\u64cd\u4f5c\u6587\u4ef6<\/p>\n\n\n\n

1.\u5bfc\u5305<\/h5>\n\n\n\n
import java.io.File;<\/code><\/pre>\n\n\n\n
2.\u6784\u9020\u65b9\u6cd5<\/h5>\n\n\n\n
\u8f93\u5165\u4e00\u4e2a\u6587\u4ef6\u4f4d\u7f6e\u5b57\u7b26\u4e32\uff08\u6587\u4ef6\u4e0d\u4e00\u5b9a\u5b58\u5728\uff09<\/p>\n\n\n\n
File f1 = new File(\"D:\\\\a.txt\");  \/\/\u8868\u793a\u4e00\u4e2a\u6587\u4ef6\nFile f2 = new File(\"D:\\\\my\");     \/\/\u8868\u793a\u4e00\u4e2a\u6587\u4ef6\u5939\nFile f3 = new File(\"b.txt\");   \/\/\u5f53\u524d\u76ee\u5f55\u76f8\u5bf9\u8def\u5f84\u4e0b\u7684 b.txt\nFile f4 = new File(\"D:\\\\aa\\\\bb\\\\\",\"a.txt\"); \/\/\u8def\u5f84\u5206\u6210 2 \u90e8\u5206\nFile f5 = new File(f2,\"a.txt\");  \/\/\u8def\u5f84\u5206\u6210 2 \u90e8\u5206\uff0c\u7236\u8def\u5f84\u4e5f\u662fFile<\/code><\/pre>\n\n\n\n
3.\u9759\u6001\u6210\u5458\u53d8\u91cf<\/h5>\n\n\n\n
1.\u7cfb\u7edf\u76f8\u5173\u7684\u8def\u5f84\u5206\u9694\u7b26<\/p>\n\n\n\n
File.pathSeparator; \/\/\u6216\u8005 File.pathSeparatorChar\n  windows --> ;\uff08\u5206\u53f7\uff09\n  linix --> :\uff08\u5192\u53f7\uff09<\/code><\/pre>\n\n\n\n
2.\u7cfb\u7edf\u76f8\u5173\u7684\u540d\u79f0\u5206\u9694\u7b26<\/p>\n\n\n\n
File.separator; \/\/\u6216\u8005 File.separatorChar\n  windows --> \\   (\u8fd9\u4e2a\u662f\u8f6c\u4e49\u5b57\u7b26\uff0c\u5b9e\u9645\u8981\u7528 \\\\ )\n  linux --> \/<\/code><\/pre>\n\n\n\n
4.\u65b9\u6cd5<\/h5>\n\n\n\n
1.\u83b7\u53d6\u76f8\u5173\u529f\u80fd<\/p>\n\n\n\n
\/\/1.\u83b7\u53d6\u7edd\u5bf9\u8def\u5f84\nString absolutePath = f3.getAbsolutePath();\n\/\/2.\u83b7\u53d6\u6784\u9020\u65f6\u8f93\u5165\u7684\u4f4d\u7f6e\nString path1 = f1.getPath();  \nString path2 = f3.getPath();  \/\/\u8f93\u5165\u662f\u76f8\u5bf9\uff0c\u8f93\u51fa\u8fd8\u662f\u76f8\u5bf9\u8def\u5f84\n\/\/3.\u83b7\u53d6\u6587\u4ef6\u540d\uff08\u6700\u540e\u7684\u4e00\u6bb5\u6587\u5b57\uff09\nString name1 = f1.getName();  \/\/a.txt\nString name2 = f2.getName();  \/\/my\n\/\/4.\u83b7\u53d6\u6587\u4ef6\u7684\u5927\u5c0f\nLong len1 = f1.length(); \/\/\u8f93\u51fa\u6587\u4ef6\u5360\u7528\u7684\u5b57\u8282\u5927\u5c0f\nLong len2 = f2.length(); \/\/\u6587\u4ef6\u5939 --> 0\nLong len3 = f3.length(); \/\/\u6587\u4ef6\u4e0d\u5b58\u5728 -->0<\/code><\/pre>\n\n\n\n
2.\u5224\u65ad\u76f8\u5173\u529f\u80fd<\/p>\n\n\n\n
\/\/1.\u5224\u65ad\u6587\u4ef6\u8def\u5f84\u662f\u5426\u771f\u5b9e\u5b58\u5728\nboolean b1 = f1.exists();  \/\/\u5b58\u5728\u8fd4\u56detrue\uff0c\u5426\u5219false\n\/\/2.\u5224\u65ad\u662f\u6587\u4ef6\uff0c\u8fd8\u662f\u6587\u4ef6\u5939\nboolean bf1 = f1.isFile(); \/\/\u5224\u65ad\u662f\u5426\u6587\u4ef6\nboolean bf2 = f2.isDirectory(); \/\/\u5224\u65ad\u662f\u5426\u6587\u4ef6\u5939\nboolean bf3 = f3.isFile(); \/\/\u5982\u679c\u8def\u5f84\u4e0d\u5b58\u5728\uff0c2 \u4e2a\u65b9\u6cd5\u5747\u8fd4\u56defalse<\/code><\/pre>\n\n\n\n
3.\u521b\u5efa\u548c\u5220\u9664\u529f\u80fd<\/p>\n\n\n\n
\/\/1.\u521b\u5efa\u6587\u4ef6\uff0c\u8def\u5f84\u5fc5\u987b\u5b58\u5728\uff0c\u5426\u5219\u62a5\u9519(\u9700\u5904\u7406\u5f02\u5e38)\nboolean bn1 = f1.createNewFile(); \/\/\u6587\u4ef6\u5b58\u5728\u65f6\uff0c\u521b\u5efa\u5931\u8d25\uff0c\u8fd4\u56defalse\nboolean bn3 = f3.createNewFile(); \/\/\u6587\u4ef6\u4e0d\u5b58\u5728\u65f6\uff0c\u521b\u5efa\u6210\u529f\uff0c\u8fd4\u56detrue\n\/\/2.\u521b\u5efa\u6587\u4ef6\u5939\uff0c\u8def\u5f84\u5fc5\u987b\u5b58\u5728\uff0c\u5426\u5219\u62a5\u9519(\u9700\u5904\u7406\u5f02\u5e38)\nboolean bn2 = f2.mkdir(); \/\/\u6587\u4ef6\u5939\u5df2\u5b58\u5728\u65f6\u8fd4\u56defalse,\u4e0d\u5b58\u5728\u8fd4\u56detrue\n\/\/3.\u521b\u5efa\u591a\u7ea7\u6587\u4ef6\u5939\nboolean bn4 = f4.mkdirs(); \n\/\/4.\u5220\u9664\u6587\u4ef6\u6216\u6587\u4ef6\u5939\nboolean bd1 = f1.delete(); \/\/\u6587\u4ef6\u6216\u6587\u4ef6\u5939\u90fd\u53ef\u4ee5\u5220\u9664\u6210\u529f\uff0c\u4e14\u4e0d\u5230\u56de\u6536\u7ad9\nboolean bd2 = f2.delete(); \/\/\u6587\u4ef6\u5939\u4e2d\u6709\u5185\u5bb9\uff0c\u5220\u9664\u5931\u8d25<\/code><\/pre>\n\n\n\n
4.\u904d\u5386\u76f8\u5173\u65b9\u6cd5<\/p>\n\n\n\n
\/\/1. list()\uff0c\u628a\u6784\u9020\u65b9\u6cd5\u4e2d\u7684\u76ee\u5f55\u4e0b\u7684\u6240\u6709\u6587\u4ef6\u540d\u5b58\u5230String\u6570\u7ec4\u4e2d(\u5305\u62ec\u9690\u85cf\u6587\u4ef6)\nString[] str1 = file2.list(); \/\/\u5982\u679c\u4e0d\u662f\u6587\u4ef6\u5939\uff0c\u4f1a\u62a5\u9519\nfor(String fileName : str1){\n  System.out.println(fileName); \n}\n\/\/2. listFiles(),\u628a\u76ee\u5f55\u5c01\u88c5\u4e3aFile\u5bf9\u8c61\uff0c\u5b58\u50a8\u5230File\u6570\u7ec4\u4e2d\nFile[] files = file2.listFiles();\nfor(File f : files){\n  System.out.println(f);\n}<\/code><\/pre>\n\n\n\n
5.\u6ce8\u610f\u4e8b\u9879<\/h5>\n\n\n\n
\u9ed8\u8ba4\u91cd\u5199\u4e86 toString \u65b9\u6cd5\uff0c\u6253\u5370\u8f93\u51fa\u5b83\u7684 getPath \u65b9\u6cd5<\/p>\n\n\n\n
\u76f8\u5bf9\u8def\u5f84\u548c\u7edd\u5bf9\u8def\u5f84\uff0c\u90fd\u53ef\u4ee5\u7528<\/p>\n\n\n\n
\u6587\u4ef6\u5939\u4e5f\u662f\u6587\u4ef6\uff0c\u662f\u4e00\u79cd\u6709\u7ed3\u6784\u7684\u6587\u4ef6<\/p>\n","protected":false},"excerpt":{"rendered":"
File \u7c7b\u662f\u64cd\u4f5c\u6587\u4ef6\u7684\u7c7b\uff0c\u5fc5\u987b\u901a\u8fc7\u6b64\u7c7b\u64cd\u4f5c\u6587\u4ef6 1.\u5bfc\u5305 2.\u6784\u9020\u65b9\u6cd5 \u8f93\u5165\u4e00\u4e2a\u6587\u4ef6\u4f4d\u7f6e\u5b57\u7b26\u4e32\uff08\u6587\u4ef6\u4e0d\u4e00\u5b9a\u5b58… \u7ee7\u7eed\u9605\u8bfb File — \u6587\u4ef6\u7c7b<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[22],"tags":[],"_links":{"self":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/609"}],"collection":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/comments?post=609"}],"version-history":[{"count":0,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/609\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/media?parent=609"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/categories?post=609"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/tags?post=609"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}