{"id":1627,"date":"2024-11-29T14:43:29","date_gmt":"2024-11-29T06:43:29","guid":{"rendered":"https:\/\/note.ui11.cc\/?p=1627"},"modified":"2024-11-29T15:19:14","modified_gmt":"2024-11-29T07:19:14","slug":"io%e5%ad%97%e7%ac%a6%e6%b5%81","status":"publish","type":"post","link":"https:\/\/note.ui11.cc\/index.php\/2024\/11\/29\/io%e5%ad%97%e7%ac%a6%e6%b5%81\/","title":{"rendered":"IO\u5b57\u7b26\u6d41"},"content":{"rendered":"\n

\u5b57\u8282\u6d41\uff1a\u9002\u5408\u590d\u5236\u6587\u4ef6\uff0c\u4e0d\u9002\u5408\u8bfb\u5199\u6587\u672c\u6587\u4ef6<\/p>\n\n\n\n

\u5b57\u7b26\u6d41\uff1a\u9002\u5408\u8bfb\u5199\u6587\u672c\u6587\u4ef6\u5185\u5bb9<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
    \n
  • \u5b57\u8282\uff08Byte\uff09<\/strong>\uff1a
    \u5b57\u8282\u662f\u8ba1\u7b97\u673a\u4fe1\u606f\u6280\u672f\u7528\u4e8e\u8ba1\u91cf\u5b58\u50a8\u5bb9\u91cf\u548c\u4f20\u8f93\u5bb9\u91cf\u7684\u4e00\u79cd\u8ba1\u91cf\u5355\u4f4d\uff0c\u662f\u8ba1\u7b97\u673a\u4e2d\u57fa\u672c\u7684\u5b58\u50a8\u5355\u4f4d\u3002\u4e00\u4e2a\u5b57\u8282\u7b49\u4e8e 8 \u4f4d\uff08bit\uff09\uff0c\u6bcf\u4e00\u4f4d\u53ef\u4ee5\u8868\u793a 0 \u6216 1 \u8fd9\u4e24\u79cd\u72b6\u6001\uff0c\u5b57\u8282\u901a\u5e38\u7528\u6765\u8861\u91cf\u6587\u4ef6\u5927\u5c0f\u3001\u5185\u5b58\u7a7a\u95f4\u5360\u7528\u7b49\u60c5\u51b5\u3002\u4f8b\u5982\uff0c\u4e00\u4e2a\u7b80\u5355\u7684\u6587\u672c\u6587\u4ef6\u5927\u5c0f\u4e3a 1024 \u5b57\u8282\uff0c\u610f\u5473\u7740\u8fd9\u4e2a\u6587\u4ef6\u5728\u5b58\u50a8\u4ecb\u8d28\u4e2d\u5360\u7528\u4e86 1024 \u4e2a\u5b57\u8282\u7684\u5b58\u50a8\u7a7a\u95f4\u3002<\/li>\n\n\n\n
  • \u5b57\u7b26\uff08Character\uff09<\/strong>\uff1a
    \u5b57\u7b26\u662f\u5404\u79cd\u6587\u5b57\u548c\u7b26\u53f7\u7684\u7edf\u79f0\uff0c\u7528\u4e8e\u8868\u793a\u548c\u4f20\u9012\u4fe1\u606f\uff0c\u50cf\u5e38\u89c1\u7684\u82f1\u6587\u5b57\u6bcd\uff08\u5982 ‘A’\u3001’b’ \u7b49\uff09\u3001\u6570\u5b57\uff08\u5982 ‘1’\u3001’2′ \u7b49\uff09\u3001\u6807\u70b9\u7b26\u53f7\uff08\u5982 ‘.’\u3001’,’ \u7b49\uff09\u4ee5\u53ca\u6c49\u5b57\uff08\u5982 \u201c\u4f60\u201d\u201c\u597d\u201d \u7b49\uff09\u3001\u7279\u6b8a\u5b57\u7b26\uff08\u5982 ‘$’\u3001’@’ \u7b49\uff09\u90fd\u5c5e\u4e8e\u5b57\u7b26\u7684\u8303\u7574\u3002\u5b57\u7b26\u662f\u4eba\u4eec\u5728\u4f7f\u7528\u8ba1\u7b97\u673a\u8fdb\u884c\u4fe1\u606f\u4ea4\u6d41\u3001\u6587\u672c\u7f16\u8f91\u7b49\u8fc7\u7a0b\u4e2d\u76f4\u89c2\u770b\u5230\u548c\u4f7f\u7528\u7684\u5185\u5bb9\u5355\u5143<\/li>\n<\/ul>\n\n\n\n

    FileReader(\u6587\u4ef6\u5b57\u7b26\u8f93\u5165\u6d41)\uff1a<\/strong><\/p>\n\n\n\n

    \"\"<\/div><\/figure>\n\n\n\n

    try-catch\u4ee3\u7801\u5757\u4e2d\u5f02\u5e38\u4fe1\u606f\u8f93\u51fa\uff1a<\/p>\n\n\n\n

    e.printStackTrace();<\/pre>\n\n\n\n
    \u5728 Java \u7f16\u7a0b\u4e2d\uff0c\u5f53\u7a0b\u5e8f\u51fa\u73b0\u5f02\u5e38\uff08\u4f8b\u5982\u8fd0\u884c\u65f6\u9047\u5230\u9519\u8bef\u60c5\u51b5\uff0c\u50cf\u7a7a\u6307\u9488\u5f02\u5e38\u00a0NullPointerException<\/code>\u3001\u6570\u7ec4\u8d8a\u754c\u5f02\u5e38\u00a0ArrayIndexOutOfBoundsException<\/code>\u00a0\u7b49\uff09\u65f6\uff0c\u5982\u679c\u4e0d\u8fdb\u884c\u9002\u5f53\u5904\u7406\uff0c\u7a0b\u5e8f\u4f1a\u76f4\u63a5\u7ec8\u6b62\u8fd0\u884c\uff0c\u5e76\u5728\u63a7\u5236\u53f0\u8f93\u51fa\u5f02\u5e38\u76f8\u5173\u7684\u7b80\u77ed\u9519\u8bef\u4fe1\u606f\u3002\u800c\u00a0e.printStackTrace();<\/code>\u00a0\u8bed\u53e5\u901a\u5e38\u653e\u5728\u00a0catch<\/code>\u00a0\u5757\u4e2d\uff0c\u7528\u4e8e\u6253\u5370\u51fa\u5f02\u5e38\u53d1\u751f\u65f6\u8be6\u7ec6\u7684\u5806\u6808\u8ddf\u8e2a\u4fe1\u606f\uff08Stack Trace\uff09\uff0c\u65b9\u4fbf\u5f00\u53d1\u8005\u4e86\u89e3\u5f02\u5e38\u4ea7\u751f\u7684\u6839\u6e90\u3001\u5728\u4ee3\u7801\u4e2d\u7684\u4f20\u64ad\u8def\u5f84\u4ee5\u53ca\u5177\u4f53\u5728\u54ea\u4e2a\u65b9\u6cd5\u3001\u54ea\u4e00\u884c\u4ee3\u7801\u51fa\u73b0\u4e86\u95ee\u9898\uff0c\u6709\u52a9\u4e8e\u5b9a\u4f4d\u548c\u4fee\u590d\u4ee3\u7801\u4e2d\u7684\u9519\u8bef<\/p>\n\n\n\n
    package com.file.test;\n\nimport java.io.File;\nimport java.io.FileNotFoundException;\nimport java.io.IOException;\nimport java.io.Reader;\nimport java.util.Arrays;\n\npublic class FileReader {\n\n    public static void main(String[] args) {\n        try {\n            java.io.FileReader file = new java.io.FileReader(\"FileStudy\\\\src\\\\main\\\\java\\\\com\\\\file\\\\test\\\\OutPutStreamtest.txt\");\n            \/\/\u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9\n            \/\/\u4f7f\u7528\u6587\u4ef6\u5b57\u8282\u8f93\u5165\u6d41\u8bfb\u53d6\u6587\u4ef6\uff0c\u4e00\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u7b26\n\/\/         int c ;\/\/\u6bcf\u6b21\u8bfb\u53d6\u6587\u672c\u7684\u5b57\u7b26\u7f16\u53f7\n\/\/         while ((c=file.read())!=-1){\n\/\/             System.out.print((char) c);\n\/\/         }\n            \/**\n             * \u4f7f\u7528\u6587\u4ef6\u5b57\u8282\u8f93\u5165\u6d41\u8bfb\u53d6\u6587\u4ef6\uff0c\u4e00\u6b21\u8bfb\u53d6\u591a\u4e2a\u5b57\u7b26\uff0c\u5229\u7528\u6570\u7ec4\u3001\n             *\/\n            File file1 = new File(\"FileStudy\\\\src\\\\main\\\\java\\\\com\\\\file\\\\test\\\\OutPutStreamtest.txt\");\n            char[] chars = new char[3];\n            int len;\n            java.io.FileReader fileReader = new java.io.FileReader(\"FileStudy\\\\src\\\\main\\\\java\\\\com\\\\file\\\\test\\\\OutPutStreamtest.txt\");\n\n            while ((len=fileReader.read(chars)) != -1) {\n                System.out.print(new String(chars));\n            }\n        \/\/\u7f3a\u70b9\uff1a\u6bcf\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u7b26\u6027\u80fd\u6bd4\u8f83\u5dee\n\n        } catch (IOException e) {\n            throw new RuntimeException(e);\n        } finally {\n\n        }\n\n\n    }\n}\n<\/code><\/pre>\n\n\n\n
    \u4ee3\u7801\u5206\u522b\u6f14\u793a\u4e86\u4e00\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\u548c\u4f7f\u7528\u6570\u7ec4\u8bfb\u53d6\u5b57\u8282\u7684\u4e24\u79cd\u65b9\u5f0f\uff0c\u4f7f\u7528\u6570\u7ec4\u8bfb\u53d6\u5b57\u8282\u65f6\u8981\u6ce8\u610f\u5b9a\u4e49\u6570\u7ec4\u7684\u5927\u5c0f\uff0c\u5982\u679c\u5b9a\u4e49\u7684\u6570\u7ec4\u8f83\u5927\uff0c\u5c31\u4f1a\u51fa\u73b0\u7a7a\u7684\u7b26\u53f7\uff0c<\/p>\n\n\n\n
    \u4e0d\u7ba1\u662f\u4e24\u79cd\u65b9\u5f0f\u7684\u54ea\u4e00\u79cd\uff0c\u90fd\u8981\u4e8b\u5148\u5b9a\u4e49\u4e00\u4e2aint\u7c7b\u578b\u7684\u53d8\u91cf\uff0c\u7528\u6765\u8868\u793a\u6bcf\u6b21\u8bfb\u53d6\u7684\u5b57\u7b26\u6570\u91cf\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u4fdd\u8bc1\u5f53\u6570\u7ec4\u4e3a\u7a7a\u65f6\uff0c\u505c\u6b62\u8bfb\u53d6\uff0c\u8bfb\u53d6\u5b8c\u6bd5<\/p>\n\n\n\n
    \u4f7f\u7528\u6587\u4ef6\u8f93\u5165\u6d41\u80fd\u66f4\u597d\u7684\u8bfb\u53d6\u6587\u672c\u6587\u4ef6\uff0c\u4e0d\u4f1a\u51fa\u73b0\u4e71\u7801\uff1b<\/p>\n\n\n\n
    \u6587\u672c\u6587\u4ef6\u662f\u7531\u5b57\u7b26\u7ec4\u6210\u7684\uff0c\u800c\u5b57\u7b26\u5728\u8ba1\u7b97\u673a\u4e2d\u5b58\u50a8\u9700\u8981\u901a\u8fc7\u7279\u5b9a\u7684\u7f16\u7801\u65b9\u5f0f\u8f6c\u6362\u4e3a\u5b57\u8282\u5e8f\u5217\u3002\u5b57\u7b26\u8f93\u5165\u6d41\u5185\u90e8\u9ed8\u8ba4\u4f1a\u6839\u636e\u7cfb\u7edf\u9ed8\u8ba4\u7684\u5b57\u7b26\u7f16\u7801\uff08\u4f8b\u5982\u5728\u5f88\u591a\u7cfb\u7edf\u4e2d\u662f UTF-8 \u7f16\u7801\uff09\u6216\u8005\u53ef\u4ee5\u6307\u5b9a\u7279\u5b9a\u7684\u7f16\u7801\uff08\u5982\u00a0InputStreamReader<\/code>\u00a0\u53ef\u6307\u5b9a\u7f16\u7801\uff09\u6765\u81ea\u52a8\u5904\u7406\u5b57\u7b26\u548c\u5b57\u8282\u4e4b\u95f4\u7684\u8f6c\u6362\u5de5\u4f5c\u3002\u5b83\u80fd\u591f\u5c06\u8bfb\u53d6\u5230\u7684\u5b57\u8282\u6309\u7167\u76f8\u5e94\u7f16\u7801\u89c4\u5219\u6b63\u786e\u89e3\u6790\u6210\u5b57\u7b26\uff0c\u4f7f\u5f97\u5f00\u53d1\u8005\u5728\u8bfb\u53d6\u6587\u672c\u6587\u4ef6\u65f6\u53ef\u4ee5\u76f4\u63a5\u64cd\u4f5c\u5b57\u7b26\uff0c\u65e0\u9700\u5173\u5fc3\u5e95\u5c42\u5b57\u8282\u4ee5\u53ca\u590d\u6742\u7684\u7f16\u7801\u89e3\u7801\u7ec6\u8282\u3002<\/p>\n\n\n\n
    (\u6587\u4ef6\u5b57\u8282\u51fa\u6d41)FileWriter<\/strong><\/p>\n\n\n\n
    \"\"<\/div><\/figure>\n\n\n\n
    \u6587\u4ef6\u5b57\u8282\u8f93\u51fa\u6d41\u5c31\u662f\u5199\u5185\u5b58\u5b57\u7b26\u5230\u78c1\u76d8\u6587\u4ef6\u4e2d\u53bb<\/p>\n\n\n\n
    \"\"<\/div><\/figure>\n\n\n\n
    package com.file.test;\n\nimport java.io.File;\nimport java.io.FileReader;\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.io.Writer;\nimport java.util.Arrays;\n\npublic class FileWriterTest01 {\n    public static void main(String[] args) {\n\n        \/\/\u521b\u5efa\u5b57\u7b26\u8f93\u51fa\u6d41\u7ba1\u9053\n        try(Writer file= new FileWriter(\"FileStudy\\\\src\\\\main\\\\java\\\\com\\\\file\\\\test\\\\itaa.txt\");\n\n        ) {\n            \/\/public void writer(int c);\u5199\u4e00\u4e2a\u5b57\u7b26\u51fa\u53bb\n           \/\/ file.write(97);\n            File file1 = new File(\"FileStudy\\\\src\\\\main\\\\java\\\\com\\\\file\\\\test\\\\ita.txt\");\n            System.out.println(file1.getAbsolutePath());\n            byte[] bytes = \"\\r\\n\".getBytes();\n            \/\/public void write(String)   \u4e00\u6b21\u5199\u51fa\u4e00\u4e2a\u5b57\u7b26\u4e32\n\/\/            String str=\"\u6211\u7231\u4f60\u4e2d\u56fdabc123;;;;\";\n\/\/            file.write(str);\n\/\/            file.write(Arrays.toString(bytes));\n            \/**\n             * public void write(String c,int pos,int len)    \u5199\u5b57\u7b26\u4e32\u7684\u4e00\u90e8\u5206\u51fa\u53bb\n             *\/\n\/\/            String str=\"\u6211\u7231\u4f60\u4e2d\u56fdABC 1111\";\n\/\/            file.write(str,0,4);\n            \/**\n             * public void write(char[] buffer)  \u5199\u4e00\u4e2a\u5b57\u7b26\u6570\u7ec4\u51fa\u53bb\n             *\n             *\/\n            \/\/\u6362\u884c\u7b26\uff1a\n            \/\/file.write(\"\\r\\n\");\n\/\/            \u53ef\u4ee5\u76f4\u63a5\u6362\u884c\n            \/\/\u7528\u5b57\u7b26\u6570\u7ec4\u8fdb\u884c\u6587\u4ef6copy\n            int len;\n            File file2 = new File(\"FileStudy\\\\src\\\\main\\\\java\\\\com\\\\file\\\\test\\\\it.txt\");\n            char[] chars = new char[3];\n            FileReader fileReader = new FileReader(\"FileStudy\\\\src\\\\main\\\\java\\\\com\\\\file\\\\test\\\\ita.txt\");\n\n            while ((len=fileReader.read(chars))!=-1){\n                file.write(chars,0,len);\n            }\n        } catch (IOException e) {\n            throw new RuntimeException(e);\n        }\n\n    }\n\n}\n\n<\/code><\/pre>\n\n\n\n
    \u5b9e\u73b0<\/p>\n\n\n\n
    \u6362\u884c\uff1afile.weite(“\\r\\n”);<\/p>\n\n\n\n
    \"\"<\/div><\/figure>\n\n\n\n
    \u5982\u679c\u5728\u60f3\u6539\u9020\u4e3a\u8ffd\u52a0\u7ba1\u9053\uff0c\u90a3\u4e48\u5c31\u5728\u521b\u5efa\u7ba1\u9053\u65f6\u540e\u9762\u52a0\u4e00\u4e2a\u53c2\u6570\uff1atrue  \u9ed8\u8ba4\u662f\u8986\u76d6\u7ba1\u9053\uff0c\u52a0\u4e00\u4e2a\u53c2\u6570true\u6539\u4e3a\u8ffd\u52a0\u7ba1\u9053<\/p>\n\n\n\n
    \u6ce8\u610f\uff1a\u5b57\u7b26\u8f93\u51fa\u6d41\u8f93\u51fa\u6570\u636e\u540e\uff0c\u5fc5\u987b\u5237\u65b0\u6d41\uff0c\u5199\u51fa\u53bb\u7684\u6570\u636e\u624d\u80fd\u751f\u6548<\/p>\n\n\n\n
    \u6211\u4eec\u5728\u4f7f\u7528\u5b57\u7b26\u8f93\u51fa\u6d41\u65f6\uff0c\u4f7f\u7528\u540e\u8981\u8bb0\u5f97\u628a\u6d41\u5237\u65b0\u6216\u8005\u5173\u95ed\uff0c\u56e0\u4e3a\u6211\u4eec\u5199\u5b57\u7b26\u65f6\uff0c\u5176\u5b9e\u662f\u8fdb\u5165\u5230\u4e00\u4e2a\u7f13\u51b2\u533a\uff0c\u6211\u4eec\u8981\u901a\u8fc7\u5237\u65b0\u6216\u8005\u5173\u95ed\u6d41\u6765\u901a\u77e5\u5b83\u628a\u8fd9\u4e2a\u7f13\u51b2\u533a\u5185\u5bb9\u653e\u5230\u6587\u4ef6\u4e2d\u53bb\uff0c\u5f53\u8fd9\u4e2a\u7f13\u51b2\u533a\u88ab\u6324\u6ee1\u65f6\uff0c\u4ed6\u4f1a\u81ea\u52a8\u628a\u5185\u5bb9\u5199\u5165\u5230\u6587\u4ef6\u4e2d\u53bb\uff1b<\/p>\n\n\n\n
    package com.file.test;\n\nimport java.io.FileWriter;\nimport java.io.IOException;\n\npublic class FileWriter03 {\n\n    public static void main(String[] args) {\n        try (            FileWriter fileWriter = new FileWriter(\"FileStudy\\\\src\\\\main\\\\java\\\\com\\\\file\\\\test\\\\itaa.txt\");\n        ){\n            fileWriter.write('\u6211');\n            fileWriter.write('\u6211');\n            fileWriter.write('\u6211');\n            fileWriter.write(\"\\r\\n\");\n            fileWriter.write('\u6211');\n            fileWriter.write('\u6211');\n            fileWriter.write('\u6211');\n            fileWriter.write('\u6211');\n\/\/            fileWriter.flush();\n            \/\/\u5173\u95ed\u6d41\u5305\u542b\u5237\u65b0\u64cd\u4f5c\uff0c\u5173\u95ed\u540e\u5c31\u4e0d\u53ef\u4ee5\u7ee7\u7eed\u4f7f\u7528\u8fd9\u4e2a\u6d41\n            fileWriter.close();\n\n        } catch (IOException e) {\n            throw new RuntimeException(e);\n        }\n\n\n    }\n}\n<\/code><\/pre>\n\n\n\n
    <\/p>\n","protected":false},"excerpt":{"rendered":"
    \u5b57\u8282\u6d41\uff1a\u9002\u5408\u590d\u5236\u6587\u4ef6\uff0c\u4e0d\u9002\u5408\u8bfb\u5199\u6587\u672c\u6587\u4ef6 \u5b57\u7b26\u6d41\uff1a\u9002\u5408\u8bfb\u5199\u6587\u672c\u6587\u4ef6\u5185\u5bb9 FileReader(\u6587\u4ef6\u5b57\u7b26\u8f93\u5165\u6d41) […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24],"tags":[],"class_list":["post-1627","post","type-post","status-publish","format-standard","hentry","category-fileio"],"_links":{"self":[{"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/posts\/1627","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/comments?post=1627"}],"version-history":[{"count":2,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/posts\/1627\/revisions"}],"predecessor-version":[{"id":1635,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/posts\/1627\/revisions\/1635"}],"wp:attachment":[{"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/media?parent=1627"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/categories?post=1627"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/tags?post=1627"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}