{"id":1594,"date":"2024-11-27T11:30:01","date_gmt":"2024-11-27T03:30:01","guid":{"rendered":"https:\/\/note.ui11.cc\/?p=1594"},"modified":"2024-11-28T14:27:45","modified_gmt":"2024-11-28T06:27:45","slug":"io%e6%b5%81%e6%a6%82%e8%bf%b0","status":"publish","type":"post","link":"https:\/\/note.ui11.cc\/index.php\/2024\/11\/27\/io%e6%b5%81%e6%a6%82%e8%bf%b0\/","title":{"rendered":"IO\u6d41\u6982\u8ff0\uff08\u6587\u4ef6\u5b57\u8282\u8f93\u5165\u6d41\uff09"},"content":{"rendered":"\n

I\u6307Input\uff0c\u79f0\u4e3a\u8f93\u5165\u6d41\uff1a\u8d1f\u8d23\u5965\u672c\u6570\u636e\u8bfb\u5230\u5185\u5b58\u4e2d\u53bb<\/p>\n\n\n\n

O\u6307OutPut\u79f0\u4e3a\u8f93\u51fa\u6d41\uff0c\u8d1f\u8d23\u5199\u6570\u636e\u51fa\u53bb<\/p>\n\n\n\n

IO\u6d41\u5e94\u7528\u573a\u666f\uff1a<\/p>\n\n\n\n

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

Io\u6d41\u7684\u5206\u7c7b\uff0c\u65b9\u5411\uff1a<\/p>\n\n\n\n

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

\u8fd9\u4e9b\u90fd\u662f\u62bd\u8c61\u7c7b\uff0c\u4e0d\u80fd\u76f4\u63a5\u521b\u5efa\u5bf9\u8c61\uff0c\u6211\u4eec\u8981\u627e\u5230\u4ed6\u4eec\u7684\u5b9e\u73b0\u7c7b<\/p>\n\n\n\n

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

\u4e00\u00b7\uff1aFileInputStream (\u5b57\u8282\u8f93\u5165\u6d41)<\/strong><\/p>\n\n\n\n

\u4f5c\u7528\uff1a\u4ee5\u5185\u5b58\u4e3a\u57fa\u51c6\uff0c\u53ef\u4ee5\u628a\u78c1\u76d8\u4e2d\u7684\u6570\u636e\u4ee5\u5b57\u8282\u7684\u5f62\u5f0f\u8bfb\u5230\u5185\u5b58\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.FileNotFoundException;\nimport java.io.InputStream;\n\npublic class FileInputStream {\n    public static void main(String[] args) throws Exception {\n        \/**\n         * \u638c\u63e1\u6587\u4ef6\u5b57\u8282\u8f93\u5165\u6d41\uff0c\u6bcf\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\n         *\/\n        \/\/\u5f97\u5230\u8fd9\u4e2a\u5b57\u8282\u8f93\u5165\u6d41\u5bf9\u8c61\n        \/\/InputStream is = new java.io.FileInputStream(new File(\"FileStudy\\\\src\\\\main\\\\java\\\\com\\\\file\\\\test\\\\it.txt\"));\n        \/\/\u65b9\u6cd5\u4e8c\uff1a\u76f4\u63a5\u7528FileInputStream(String pathname),\u76f4\u63a5\u628a\u6587\u4ef6\u8def\u5f84\u5199\u8fdb\u53bb\u5c31\u53ef\u4ee5\n        java.io.FileInputStream is01 = new java.io.FileInputStream(\"FileStudy\\\\src\\\\main\\\\java\\\\com\\\\file\\\\test\\\\it.txt\");\n        \/\/2:\u8bfb\u53d6\u6587\u4ef6\u7684\u5b57\u8282\u6570\u636e\n        int read = is01.read();\/\/\u8bfb\u7b2c\u4e00\u4e2a\u5b57\u8282a\n        System.out.println((char) read);\n        int read1 = is01.read();\/\/\u8bfb\u7b2c\u4e00\u4e2a\u5b57\u8282b\n        System.out.println((char) read1);\n        \/\/public int read() \u6bcf\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\uff0c\u8bfb\u5b8c\u540e\u5c31\u4f1a\u8fd4\u56de-1\n        \n    }\n}\n<\/code><\/pre>\n\n\n\n
\u4f7f\u7528FileInputStream(\u9700\u8981\u4e00\u4e2a\u6587\u4ef6\u8def\u5f84)\u6765\u521b\u5efa\u4e00\u4e2a\u5b57\u8282\u8f93\u5165\u6d41\u5bf9\u8c61\uff0cis01\uff0c\u7136\u540e\u901a\u8fc7\u8c03\u7528\u5bf9\u8c61\u7684read\u65b9\u6cd5\u8fdb\u884c\u8bfb\u53d6\u5b57\u7b26<\/p>\n\n\n\n
\u4f7f\u7528\u5faa\u73af\u4e00\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282<\/p>\n\n\n\n
package com.file.test;\n\nimport java.io.File;\nimport java.io.FileNotFoundException;\nimport java.io.InputStream;\n\npublic class FileInputStream {\n    public static void main(String[] args) throws Exception {\n        \/**\n         * \u638c\u63e1\u6587\u4ef6\u5b57\u8282\u8f93\u5165\u6d41\uff0c\u6bcf\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\n         *\/\n        \/\/\u5f97\u5230\u8fd9\u4e2a\u5b57\u8282\u8f93\u5165\u6d41\u5bf9\u8c61\n        \/\/InputStream is = new java.io.FileInputStream(new File(\"FileStudy\\\\src\\\\main\\\\java\\\\com\\\\file\\\\test\\\\it.txt\"));\n        \/\/\u65b9\u6cd5\u4e8c\uff1a\u76f4\u63a5\u7528FileInputStream(String pathname),\u76f4\u63a5\u628a\u6587\u4ef6\u8def\u5f84\u5199\u8fdb\u53bb\u5c31\u53ef\u4ee5\n        java.io.FileInputStream is01 = new java.io.FileInputStream(\"FileStudy\\\\src\\\\main\\\\java\\\\com\\\\file\\\\test\\\\it.txt\");\n\/\/        \/\/2:\u8bfb\u53d6\u6587\u4ef6\u7684\u5b57\u8282\u6570\u636e\n\/\/        int read = is01.read();\/\/\u8bfb\u7b2c\u4e00\u4e2a\u5b57\u8282a\n\/\/        System.out.println((char) read);\n\/\/        int read1 = is01.read();\/\/\u8bfb\u7b2c\u4e00\u4e2a\u5b57\u8282b\n\/\/        System.out.println((char) read1);\n\/\/        \/\/public int read() \u6bcf\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\uff0c\u8bfb\u5b8c\u540e\u5c31\u4f1a\u8fd4\u56de-1\n        \/\/\u4f7f\u7528\u5faa\u73af\u6539\u9020\u4e0a\u8ff0\u4ee3\u7801\n        int b;\/\/\u7528\u4e8e\u8bb0\u4f4f\u8bfb\u53d6\u7684\u5b57\u8282\n        while ((b =is01.read()) != -1) {\n            System.out.println(\"\u8bfb\u53d6\u7684\u5b57\u8282\u4e3a\uff1a\");\n            System.out.print((char) b);\/\/\u6bcf\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\uff0c\u5982\u679c\u662f\u6c49\u5b57\u5c31\u4f1a\u4e71\u7801\n            \/\/\u8bfb\u53d6\u6027\u80fd\u5dee\uff0c\u5c3d\u91cf\u51cf\u5c11\u6211\u4eec\u7684\u7cfb\u7edf\u53bb\u8c03\u7528\u786c\u76d8\u6570\u636e\u7684\u6b21\u6570\n        }\n        \/\/\u6bcf\u6b21\u4f7f\u7528\u5b8c\u4ee5\u540e\u8bb0\u5f97\u91ca\u653e\u8d44\u6e90\n        is01.close();\n\n    }\n}\n<\/code><\/pre>\n\n\n\n
\u4f7f\u7528FileInputStream\u5b57\u8282\u8f93\u5165\u6d41\u6bcf\u6b21\u8bfb\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\uff0c\u8bfb\u53d6\u6027\u80fd\u8f83\u5dee\uff0c\u5e76\u4e14\u8bfb\u53d6\u7684\u6c49\u5b57\u662f\u4e71\u7801\uff08\u56e0\u4e3autf-8\uff09\u7f16\u7801\u4e2d\uff0c\u6c49\u5b57\u662f\u4e09\u4e2a\u5b57\u8282\uff1b<\/p>\n\n\n\n
\u6587\u4ef6\u5b57\u8282\u8f93\u5165\u6d41\u4e00\u6b21\u8bfb\u53d6\u591a\u4e2a\u5b57\u8282<\/strong>\uff08read(byte[] buffer)\uff09<\/p>\n\n\n\n
:\u6bcf\u6b21\u7528\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u53bb\u8bfb\u53d6\u6570\u636e\uff0c\u8fd4\u56de\u5b57\u8282\u6570\u7ec4\u8bfb\u53d6\u4e86\u591a\u5c11\u4e2a\u5b57\u8282\uff0c\u5982\u679c\u53d1\u73b0\u6ca1\u6709\u6570\u636e\u53ef\u8bfb\u4f1a\u8fd4\u56de-1<\/p>\n\n\n\n
\u8bfb\u53d6\u5b57\u8282\u8981\u7528new String\uff08buffer\uff09;<\/p>\n\n\n\n
package com.file.test;\n\nimport java.io.File;\nimport java.io.FileNotFoundException;\nimport java.io.InputStream;\n\npublic class FileInputStream {\n    public static void main(String[] args) throws Exception {\n        \/**\n         * \u638c\u63e1\u6587\u4ef6\u5b57\u8282\u8f93\u5165\u6d41\uff0c\u6bcf\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\n         *\/\n        \/**\n         * \u6bcf\u6b21\u8bfb\u53d6\u591a\u4e2a\u5b57\u8282\n         *\/\n\n        \/\/\u9996\u5148\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6\u5b57\u8282\u8f93\u5165\u6d41\u5bf9\u8c61\u4e0e\u6e90\u6587\u4ef6\u63a5\u901a\n\n       InputStream is = new java.io.FileInputStream(\"FileStudy\\\\src\\\\main\\\\java\\\\com\\\\file\\\\test\\\\it.txt\");\n       \/\/\u8bfb\u53d6\u6587\u4ef6\u4e2d\u7684\u5b57\u8282\u6570\u636e\uff0c\u6bcf\u6b21\u8bfb\u53d6\u591a\u4e2a\u5b57\u8282\n         byte[] buffer =new byte[3];\/\/\u4e00\u6b21\u8bfb\u53d6\u662f\u4e09\u4e2a\u5b57\u8282\n        int read = is.read(buffer);\n        String s = new String(buffer);\/\/\u4ece\u7b2c\u4e00\u4e2a\u5b57\u8282\u5f00\u59cb\u5012\u51fa\uff0c\u5012\u51faread\u8fd9\u4e48\u957f\u7684\u5b57\u8282\u6570\n        System.out.println(s);\n        System.out.println(\"\u5f53\u6b21\u8bfb\u53d6\u7684\u5b57\u8282\u6570\u91cf\u4e3a\"+read);\n        \/\/\u53ef\u4ee5\u8fd8\u4f7f\u7528\u8fd9\u4e2a\u6876\u6765\u8bfb\u53d6\u5b57\u8282\n        int read1 = is.read(buffer);\n        \/\/\u4e3a\u4e86\u907f\u514d\u8bfb\u53d6\u9519\u8bef\uff0c\u6211\u4eec\u8981\u8bfb\u53d6\u591a\u5c11\uff0c\u5012\u51fa\u591a\u5c11\n\n        String s1 = new String(buffer);\n        System.out.println(s1);\/\/\u4e00\u51715\u4e2a\u5b57\u8282abA66\uff0c\u7b2c\u4e00\u6b21\u8bfb\u53d6abA\uff0c\u518d\u6b21\u8bfb\u53d6\u7684\u65f6\u5019\u4f1a\u662f66A\u3002\u56e0\u4e3a\u4f1a\u62ff\u540e\u9762\u4e24\u4e2a\u5b57\u8282\u53bb\u8986\u76d6\u524d\u9762\u7684\uff0c\u56e0\u4e3a\u6ca1\u6709\u8986\u76d6A\u7684\u5b57\u8282\uff0c\u6240\u4ee5\u4f1a\u7559\u5728\u90a3\u91cc\n        is.close();\n\n    }\n}\n<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
package com.file.test;\n\nimport java.io.File;\nimport java.io.FileNotFoundException;\nimport java.io.InputStream;\n\npublic class FileInputStream {\n    public static void main(String[] args) throws Exception {\n        \/**\n         * \u638c\u63e1\u6587\u4ef6\u5b57\u8282\u8f93\u5165\u6d41\uff0c\u6bcf\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\n         *\/\n        \/**\n         * \u6bcf\u6b21\u8bfb\u53d6\u591a\u4e2a\u5b57\u8282\n         *\/\n\n        \/\/\u9996\u5148\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6\u5b57\u8282\u8f93\u5165\u6d41\u5bf9\u8c61\u4e0e\u6e90\u6587\u4ef6\u63a5\u901a\n\n       InputStream is = new java.io.FileInputStream(\"FileStudy\\\\src\\\\main\\\\java\\\\com\\\\file\\\\test\\\\it.txt\");\n       \/\/\u8bfb\u53d6\u6587\u4ef6\u4e2d\u7684\u5b57\u8282\u6570\u636e\uff0c\u6bcf\u6b21\u8bfb\u53d6\u591a\u4e2a\u5b57\u8282\n         byte[] buffer =new byte[3];\/\/\u4e00\u6b21\u8bfb\u53d6\u662f\u4e09\u4e2a\u5b57\u8282\n        int read = is.read(buffer);\n        String s = new String(buffer,0,read);\/\/\u4ece\u7b2c\u4e00\u4e2a\u5b57\u8282\u5f00\u59cb\u5012\u51fa\uff0c\u5012\u51faread\u8fd9\u4e48\u957f\u7684\u5b57\u8282\u6570\n        System.out.println(s);\n        System.out.println(\"\u5f53\u6b21\u8bfb\u53d6\u7684\u5b57\u8282\u6570\u91cf\u4e3a\"+read);\n        \/\/\u53ef\u4ee5\u8fd8\u4f7f\u7528\u8fd9\u4e2a\u6876\u6765\u8bfb\u53d6\u5b57\u8282\n        int read1 = is.read(buffer);\n        \/\/\u4e3a\u4e86\u907f\u514d\u8bfb\u53d6\u9519\u8bef\uff0c\u6211\u4eec\u8981\u8bfb\u53d6\u591a\u5c11\uff0c\u5012\u51fa\u591a\u5c11\n\n        String s1 = new String(buffer,0,read1);\n        System.out.println(s1);\/\/\u4e00\u51715\u4e2a\u5b57\u8282abA66\uff0c\u7b2c\u4e00\u6b21\u8bfb\u53d6abA\uff0c\u518d\u6b21\u8bfb\u53d6\u7684\u65f6\u5019\u4f1a\u662f66A\u3002\u56e0\u4e3a\u4f1a\u62ff\u540e\u9762\u4e24\u4e2a\u5b57\u8282\u53bb\u8986\u76d6\u524d\u9762\u7684\uff0c\u56e0\u4e3a\u6ca1\u6709\u8986\u76d6A\u7684\u5b57\u8282\uff0c\u6240\u4ee5\u4f1a\u7559\u5728\u90a3\u91cc\n        is.close();\n\n    }\n}\n<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u8bfb\u591a\u5c11\uff0c\u5012\u51fa\u591a\u5c11<\/p>\n\n\n\n
\u8fd9\u6837\u8bfb\u53d6\u592a\u9ebb\u70e6\uff0c\u800c\u4e14\u8bfb\u53d6\u7684\u6548\u7387\u4e0d\u9ad8\uff0c\u8017\u7528\u6027\u80fd\u592a\u5927\uff0c\u4f7f\u7528\u5faa\u73af\u6765\u8fdb\u884c\u8bfb\u5199\uff0c\u6211\u4eec\u5bf9\u4ee3\u7801\u8fdb\u884c\u6539\u9020<\/p>\n\n\n\n
InputStream is = new java.io.FileInputStream(\"FileStudy\\\\src\\\\main\\\\java\\\\com\\\\file\\\\test\\\\it.txt\");\n           byte[] buffer= new byte[3];\/\/\u4e00\u6b21\u8bfb\u53d6\u4e09\u4e2a\u5b57\u8282\n        int len;\n        System.out.println(\"\u8bfb\u53d6\u7684\u5b57\u7b26\u4e3a\");\n\n        while((len=is.read(buffer))!=-1){\n            \/\/is.read()\u4f1a\u8fd4\u56de\u4e00\u4e2aint\u7c7b\u578b\u7684\u6570\u7ec4\uff0c\u4ee3\u8868\u6bcf\u6b21\u8bfb\u53d6\u591a\u5c11\u4e2a\u5b57\u8282\n            String s = new String(buffer, 0, len);\n            System.out.print(s);\n        }\n        is.close();\n        \/\/\u6027\u80fd\u5f97\u5230\u63d0\u793a\uff0c\u4f46\u662f\u4e5f\u53ef\u907f\u514d\u51fa\u73b0\u6c49\u5b57\u4e71\u7801\u7684\u95ee\u9898\n<\/code><\/pre>\n\n\n\n
\u4e00\u6b21\u8bfb\u53d6\u5168\u90e8\u5b57\u8282\uff08First way\uff09\uff1a<\/strong><\/p>\n\n\n\n
  InputStream is = new java.io.FileInputStream(\"FileStudy\\\\src\\\\main\\\\java\\\\com\\\\file\\\\test\\\\it.txt\");\n        File file = new File(\"FileStudy\\\\src\\\\main\\\\java\\\\com\\\\file\\\\test\\\\it.txt\");\n        long length = file.length();\n        byte[] bytes = new byte[(int) length];\n        while (is.read(bytes) != -1) {\n            System.out.println(new String(bytes));\n        }\n        System.out.println(length);\n        System.out.println(bytes.length);\n        is.close();<\/code><\/pre>\n\n\n\n
\u6211\u4eec\u901a\u8fc7\u4e00\u4e2aFile\u7c7b\u5bf9\u8c61\u6307\u5b9a\u4e00\u4e2a\u6587\u4ef6\u3002\u901a\u8fc7length\uff08\uff09\u6765\u83b7\u53d6\u8fd9\u4e2a\u6587\u4ef6\u7684\u5927\u5c0f\uff0c\u7531\u4e8e\u7535\u8111\u8fd0\u884c\u5185\u5fc3\u6709\u7ebf\uff0c\u6240\u4ee5\u5728\u6570\u7ec4\u4e2d\u6570\u7ec4\u4e2d\u7684\u652f\u6301\u6570\u636e\u7c7b\u578b\u4e3aint, \u800c\u6211\u4eecfile\u6587\u4ef6\u7684\u957f\u5ea6\u4e3along\uff0c\u6240\u4ee5\u9700\u8981\u5f3a\u8f6c\u4e00\u4e0b<\/p>\n\n\n\n
\u4e00\u6b21\u8bfb\u53d6\u5168\u90e8\u5b57\u8282\uff08Second way\uff09\uff1a<\/strong><\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u4ee3\u7801\uff1a<\/p>\n\n\n\n
        InputStream is = new java.io.FileInputStream(\"FileStudy\\\\\\\\src\\\\\\\\main\\\\\\\\java\\\\\\\\com\\\\\\\\file\\\\\\\\test\\\\\\\\it.txt\");\n        byte[] bytes = is.readAllBytes();\n        System.out.println(new String(bytes));\n        \n\n<\/code><\/pre>\n\n\n\n
\u6ce8\u610f\uff1a\u5982\u679c\u6587\u4ef6\u592a\u5927\uff0c\u90a3\u4e48\u5c31\u4f1a\u629b\u51fa\u5f02\u5e38\uff0c\u5185\u5b58\u6ea2\u51fa<\/p>\n\n\n\n
<\/p>\n\n\n\n
<\/p>\n\n\n\n
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