{"id":574,"date":"2023-09-08T16:34:33","date_gmt":"2023-02-16T18:26:15","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java%e4%b8%ad%e7%9a%84scanner%e7%b1%bb\/"},"modified":"2025-08-02T19:43:11","modified_gmt":"2025-08-02T11:43:11","slug":"java%e4%b8%ad%e7%9a%84scanner%e7%b1%bb","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e4%b8%ad%e7%9a%84scanner%e7%b1%bb\/","title":{"rendered":"Java Scanner\u7c7b\u5b8c\u5168\u6307\u5357\uff1a\u7528\u6cd5\u3001\u5b9e\u4f8b\u4e0e\u5e38\u89c1\u95ee\u9898\u89e3\u6790"},"content":{"rendered":"

Java\u4e2d\u7684Scanner\u7c7b<\/h2>\n

Java\u7684Scanner\u7c7b\u662fjava.util\u5305\u7684\u4e00\u90e8\u5206\u3002\u5b83\u5728Java 1.5\u7248\u672c\u4e2d\u88ab\u5f15\u5165\u3002Scanner\u4e3b\u8981\u7528\u4e8e\u63a5\u6536\u7528\u6237\u8f93\u5165\u5e76\u5c06\u5176\u89e3\u6790\u4e3a\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u5982int\u3001double\u6216\u9ed8\u8ba4\u5b57\u7b26\u4e32\u3002\u5b83\u662f\u4e00\u4e2a\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u751f\u6210\u6807\u8bb0\u6765\u89e3\u6790\u6570\u636e\u7684\u5b9e\u7528\u5de5\u5177\u7c7b\u3002<\/p>\n

Java Scanner\u7c7b\u7684\u6784\u9020\u51fd\u6570<\/h2>\n

\u5982\u679c\u67e5\u770bScanner\u7c7b\uff0c\u4f1a\u53d1\u73b0\u5b83\u6709\u5f88\u591a\u6784\u9020\u51fd\u6570\u3002<\/p>\n

\"Scanner<\/div>\n

\u5927\u591a\u6570\u6784\u9020\u51fd\u6570\u90fd\u4f7f\u7528\u4ee5\u4e0b\u4e09\u79cd\u5bf9\u8c61\u4e4b\u4e00\uff1a<\/p>\n

    \n
  1. InputStream<\/strong> – \u6700\u5e38\u89c1\u7684\u65b9\u5f0f\u662f\u5c06System.in\u4f5c\u4e3a\u53c2\u6570\u4f20\u5165\u4ee5\u63a5\u6536\u7528\u6237\u8f93\u5165\u3002<\/li>\n
  2. File\u6216Path<\/strong> – \u6211\u4eec\u4e5f\u53ef\u4ee5\u626b\u63cf\u6587\u4ef6\u6570\u636e\u5e76\u5904\u7406\u6587\u4ef6\u4e2d\u7684\u503c\u3002<\/li>\n
  3. String<\/strong> – \u6211\u4eec\u4e5f\u53ef\u4ee5\u4e3a\u5b57\u7b26\u4e32\u6765\u6e90\u521b\u5efa\u626b\u63cf\u5668\uff0c\u5e76\u89e3\u6790\u5176\u4e2d\u7684\u503c\u3002<\/li>\n<\/ol>\n

    \u5982\u679c\u67e5\u770b\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff0c\u5b83\u662f\u7528\u4e8e\u6307\u5b9a\u5b57\u7b26\u96c6\u7684\uff0c\u5f53\u4f60\u4e0d\u60f3\u4f7f\u7528\u9ed8\u8ba4\u5b57\u7b26\u96c6\u8fdb\u884c\u89e3\u6790\u65f6\u53ef\u4ee5\u4f7f\u7528\u3002<\/p>\n

    Scanner\u7c7b\u7684\u91cd\u8981\u65b9\u6cd5<\/h2>\n

    \u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u6700\u5e38\u7528\u7684Scanner\u7c7b\u65b9\u6cd5\uff1a<\/p>\n

      \n
    • useDelimiter(String pattern)<\/strong> – \u8bbe\u7f6e\u626b\u63cf\u5668\u4f7f\u7528\u7684\u5206\u9694\u7b26\u3002\u9ed8\u8ba4\u5206\u9694\u7b26\u662f\u7a7a\u767d\u5b57\u7b26\u3002<\/li>\n
    • hasNext()<\/strong> – \u5982\u679c\u8f93\u5165\u4e2d\u8fd8\u6709\u53e6\u4e00\u4e2a\u6807\u8bb0\uff0c\u5219\u8fd4\u56detrue\u3002\u8fd9\u662f\u4e00\u4e2a\u963b\u585e\u65b9\u6cd5\uff0c\u5b83\u4f1a\u6301\u7eed\u7b49\u5f85\u7528\u6237\u8f93\u5165\u3002<\/li>\n
    • next()<\/strong> – \u4ece\u626b\u63cf\u5668\u8fd4\u56de\u4e0b\u4e00\u4e2a\u6807\u8bb0\u3002\u5b83\u4e0ehasNext()\u65b9\u6cd5\u4e00\u8d77\u4f7f\u7528\u3002<\/li>\n
    • close()<\/strong> – \u626b\u63cf\u5668\u5360\u7528\u8d44\u6e90\u8f83\u591a\uff0c\u56e0\u6b64\u4f7f\u7528\u5b8c\u6bd5\u540e\uff0c\u5e94\u4f7f\u7528\u6b64\u65b9\u6cd5\u5173\u95ed\u5b83\u5e76\u91ca\u653e\u7cfb\u7edf\u8d44\u6e90\u3002<\/li>\n<\/ul>\n

      \u8fd8\u6709\u8bb8\u591a\u5b9e\u7528\u65b9\u6cd5\u53ef\u4ee5\u68c0\u67e5\u548c\u76f4\u63a5\u89e3\u6790\u8f93\u5165\u6807\u8bb0\u4e3aint\u3001short\u3001long\u3001byte\u3001BigDecimal\u7b49\u7c7b\u578b\u7684\u503c\u3002<\/p>\n

      \u521d\u59cb\u5316\u548c\u4f7f\u7528\u626b\u63cf\u5668\u7684\u6b65\u9aa4<\/h2>\n
        \n
      1. \u7b2c\u4e00\u6b65\u662f\u901a\u8fc7\u4f7f\u7528\u9002\u5f53\u7684\u6784\u9020\u51fd\u6570\u521d\u59cb\u5316\u626b\u63cf\u5668\u7c7b\uff0c\u6839\u636e\u8f93\u5165\u7c7b\u578b\u9009\u62e9InputStream\u3001File\u6216String\u3002\u5982\u679c\u9700\u8981\uff0c\u8bbe\u7f6e\u5206\u9694\u7b26\u548c\u5b57\u7b26\u96c6\u3002<\/li>\n
      2. \u7b2c\u4e8c\u6b65\u662f\u4f7f\u7528hasNext()\u65b9\u6cd5\u7b49\u5f85\u8f93\u5165\u7684\u6807\u8bb0\u3002<\/li>\n
      3. \u7136\u540e\u4f7f\u7528next()\u65b9\u6cd5\u8bfb\u53d6\u6807\u8bb0\u5e76\u9010\u4e2a\u5904\u7406\u5b83\u4eec\u3002<\/li>\n<\/ol>\n

        \u626b\u63cf\u5668\u662f\u5982\u4f55\u5de5\u4f5c\u7684\uff1f<\/h2>\n
          \n
        • Scanner\u7c7b\u4f7f\u7528\u6307\u5b9a\u7684\u5206\u9694\u7b26\u6a21\u5f0f\u5c06\u5176\u8f93\u5165\u5206\u89e3\u4e3a\u6807\u8bb0\u3002<\/li>\n
        • next()\u65b9\u6cd5\u7528\u4e8e\u9010\u4e2a\u8bfb\u53d6\u6807\u8bb0\u5e76\u5904\u7406\u5b83\u4eec\u3002<\/li>\n
        • \u6700\u540e\uff0c\u5173\u95edScanner\u5b9e\u4f8b\u4ee5\u91ca\u653e\u7cfb\u7edf\u8d44\u6e90\u3002<\/li>\n<\/ul>\n

          \u626b\u63cf\u5668\u793a\u4f8b<\/h2>\n

          \u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e0bScanner\u7c7b\u7684\u4e00\u4e9b\u5e38\u89c1\u7528\u6cd5\u548c\u793a\u4f8b\u4ee3\u7801\u7247\u6bb5\u3002<\/p>\n

          1. \u8bfb\u53d6\u7528\u6237\u8f93\u5165<\/h3>\n

          \u8fd9\u662fScanner\u7c7b\u6700\u5e38\u89c1\u7684\u7528\u6cd5\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528System.in\u4f5c\u4e3a\u8f93\u5165\u6e90\u6765\u5b9e\u4f8b\u5316\u5e76\u8bfb\u53d6\u7528\u6237\u8f93\u5165\u3002<\/p>\n

          \/\/ read user input<\/span>\r\nScanner<\/span> sc =<\/span> new<\/span> Scanner<\/span>(<\/span>System<\/span>.<\/span>in)<\/span>;<\/span>\r\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"Please enter your name\"<\/span>)<\/span>;<\/span>\r\nString<\/span> name =<\/span> sc.<\/span>next<\/span>(<\/span>)<\/span>;<\/span>\r\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"Hello \"<\/span> +<\/span> name)<\/span>;<\/span>\r\nsc.<\/span>close<\/span>(<\/span>)<\/span>;<\/span>\r\n<\/code><\/pre>\n
          \u8f93\u51fa\uff1a<\/p>\n
          Please enter your name\r\nPankaj\r\nHello Pankaj\r\n<\/code><\/pre>\n
          \u55ef\uff0c\u770b\u8d77\u6765\u7b80\u5355\u4e14\u8fd0\u884c\u826f\u597d\u3002\u7136\u800c\uff0c\u4e0a\u8ff0\u4ee3\u7801\u5b58\u5728\u4e00\u4e2a\u95ee\u9898\u3002\u5728\u9605\u8bfb\u4e0b\u4e00\u90e8\u5206\u4e4b\u524d\uff0c\u4f60\u80fd\u5426\u68c0\u67e5\u4ee3\u7801\u5e76\u5c1d\u8bd5\u627e\u51fa\u95ee\u9898\u6240\u5728\uff1f<\/p>\n
          \u8ba9\u6211\u4eec\u770b\u770b\u5f53\u6211\u5728\u8f93\u5165\u6846\u4e2d\u5199\u4e0b\u6211\u7684\u5168\u540d\u65f6\u4f1a\u53d1\u751f\u4ec0\u4e48\u3002<\/p>\n
          Please enter your name\r\nPankaj Kumar\r\nHello Pankaj\r\n<\/code><\/pre>\n
          \u73b0\u5728\u4f60\u4e00\u5b9a\u660e\u767d\u4e86\uff0c\u8fd9\u662f\u56e0\u4e3a\u7a7a\u683c\u662f\u5206\u9694\u7b26\u3002\u626b\u63cf\u5668\u5c06\u8f93\u5165\u5206\u6210\u4e24\u4e2a\u4ee4\u724c – Pankaj\u548cKumar\u3002\u4f46\u662f\uff0c\u6211\u4eec\u53ea\u8c03\u7528\u4e86\u4e00\u6b21next()\u65b9\u6cd5\uff0c\u6240\u4ee5\u53ea\u6253\u5370\u4e86\u201cHello Pankaj\u201d\u3002<\/p>\n
          \u6211\u4eec\u8be5\u5982\u4f55\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff1f<\/p>\n
          \u5f88\u7b80\u5355\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 useDelimiter() \u65b9\u6cd5\u5c06\u5206\u9694\u7b26\u66f4\u6539\u4e3a\u6362\u884c\u7b26\u3002<\/p>\n
          Scanner<\/span> sc =<\/span> new<\/span> Scanner<\/span>(<\/span>System<\/span>.<\/span>in)<\/span>;<\/span>\r\nsc.<\/span>useDelimiter<\/span>(<\/span>System<\/span>.<\/span>getProperty<\/span>(<\/span>\"line.separator\"<\/span>)<\/span>)<\/span>;<\/span>\r\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"Please enter your name\"<\/span>)<\/span>;<\/span>\r\nString<\/span> name =<\/span> sc.<\/span>next<\/span>(<\/span>)<\/span>;<\/span>\r\nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>\"Hello \"<\/span> +<\/span> name)<\/span>;<\/span>\r\nsc.<\/span>close<\/span>(<\/span>)<\/span>;<\/span>\r\n<\/code><\/pre>\n
          \u4f7f\u7528\u626b\u63cf\u5668\u89e3\u6790\u6587\u4ef6\u6570\u636e\u3002<\/p>\n
          \u8fd9\u662f\u6587\u7ae0\u300aJava\u4e2d\u7684Scanner\u7c7b\u300b\u7684\u7b2c3\u90e8\u5206\uff08\u51713\u90e8\u5206\uff09\u3002<\/p>\n
          \u8ba9\u6211\u4eec\u770b\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff0c\u4f7f\u7528Scanner\u7c7b\u6765\u8bfb\u53d6\u548c\u89e3\u6790CSV\u6587\u4ef6\u3002\u5047\u8bbe\u6211\u6709\u4e00\u4e2a\u540d\u4e3aemployees.csv\u7684\u6587\u4ef6\uff0c\u5185\u5bb9\u5982\u4e0b\u3002<\/p>\n
          1,Jane Doe,CEO\r\n2,Mary Ann,CTO\r\n3,John Lee,CFO\r\n<\/code><\/pre>\n
          \u8ba9\u6211\u4eec\u5728\u6211\u4eec\u7684Java\u7a0b\u5e8f\u4e2d\u8bfb\u53d6\u6587\u4ef6\u5e76\u83b7\u53d6\u4e00\u4e2a\u5458\u5de5\u5217\u8868\u3002<\/p>\n
          package com.Olivia.java;\r\n\r\nimport java.io.File;\r\nimport java.io.IOException;\r\nimport java.util.ArrayList;\r\nimport java.util.List;\r\nimport java.util.Scanner;\r\n\r\npublic class ScannerExamples {\r\n\r\n\tpublic static void main(String[] args) throws IOException {\r\n\r\n\t\t\/\/ create scanner for the CSV file\r\n\t\tScanner sc = new Scanner(new File(\"employees.csv\"));\r\n\r\n\t\t\/\/ set delimiter as new line to read one line as a single token\r\n\t\tsc.useDelimiter(System.getProperty(\"line.separator\"));\r\n\r\n\t\t\/\/ create the List of Employees\r\n\t\tList<<\/span>Employee<\/span>><\/span><\/span> emps = new ArrayList<>();\r\n\r\n\t\twhile (sc.hasNext()) {\r\n\t\t\tEmployee emp = parseEmployeeData(sc.next());\r\n\t\t\temps.add(emp);\r\n\t\t}\r\n\r\n\t\t\/\/ close the scanner\r\n\t\tsc.close();\r\n\r\n\t\t\/\/ print employee records\r\n\t\tSystem.out.println(emps);\r\n\t}\r\n\r\n\tprivate static Employee parseEmployeeData(String record) {\r\n\t\t\/\/ create scanner for the String record\r\n\t\tScanner sc = new Scanner(record);\r\n\r\n\t\t\/\/ set delimiter as comma\r\n\t\tsc.useDelimiter(\",\");\r\n\r\n\t\tEmployee emp = new Employee();\r\n\t\temp.setId(sc.nextInt());\r\n\t\temp.setName(sc.next());\r\n\t\temp.setRole(sc.next());\r\n\r\n\t\t\/\/ close the scanner\r\n\t\tsc.close();\r\n\r\n\t\treturn emp;\r\n\t}\r\n\r\n}\r\n\r\nclass Employee {\r\n\tprivate int id;\r\n\tprivate String name;\r\n\tprivate String role;\r\n\r\n\tpublic int getId() {\r\n\t\treturn id;\r\n\t}\r\n\r\n\tpublic void setId(int id) {\r\n\t\tthis.id = id;\r\n\t}\r\n\r\n\tpublic String getName() {\r\n\t\treturn name;\r\n\t}\r\n\r\n\tpublic void setName(String name) {\r\n\t\tthis.name = name;\r\n\t}\r\n\r\n\tpublic String getRole() {\r\n\t\treturn role;\r\n\t}\r\n\r\n\tpublic void setRole(String role) {\r\n\t\tthis.role = role;\r\n\t}\r\n\r\n\t@Override\r\n\tpublic String toString() {\r\n\t\treturn \"Emp[\" + id + \",\" + name + \",\" + role + \"]\";\r\n\t}\r\n}\r\n<\/code><\/pre>\n
            \n
          • \u7b2c\u4e00\u6b65\u662f\u4e3aCSV\u6587\u4ef6\u521b\u5efa\u626b\u63cf\u5668\uff0c\u5e76\u5c06\u6362\u884c\u7b26\u8bbe\u7f6e\u4e3a\u5206\u9694\u7b26\u3002<\/li>\n
          • \u7136\u540e\uff0c\u5bf9\u4e8e\u5305\u542bCSV\u683c\u5f0f\u5458\u5de5\u8bb0\u5f55\u7684\u6bcf\u4e00\u884c\uff0c\u4f7f\u7528\u53e6\u4e00\u4e2a\u626b\u63cf\u5668\u548c\u9017\u53f7\u4f5c\u4e3a\u5206\u9694\u7b26\u8fdb\u884c\u89e3\u6790\u3002parseEmployeeData()\u65b9\u6cd5\u6b63\u5728\u89e3\u6790\u6bcf\u4e00\u884c\u5e76\u521b\u5efaEmployee\u5bf9\u8c61\u3002<\/li>\n
          • \u6700\u540e\uff0c\u6211\u4eec\u5c06\u5458\u5de5\u5bf9\u8c61\u6dfb\u52a0\u5230\u5217\u8868\u4e2d\u5e76\u6253\u5370\u51fa\u6765\u3002<\/li>\n<\/ul>\n
            \u8f93\u51fa\uff1a[\u5458\u5de5[1, \u7b80\u6735, \u9996\u5e2d\u6267\u884c\u5b98], \u5458\u5de5[2, \u739b\u4e3d\u5b89, \u9996\u5e2d\u6280\u672f\u5b98], \u5458\u5de5[3, \u7ea6\u7ff0\u674e, \u9996\u5e2d\u8d22\u52a1\u5b98]]<\/p>\n
            3. Java \u6b63\u5219\u8868\u8fbe\u5f0f\u7684 Scanner \u793a\u4f8b<\/h3>\n
            \u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u5b57\u7b26\u4e32source\uff0c\u6211\u4eec\u60f3\u8981\u5904\u7406\u5176\u4e2d\u7684\u6574\u6570\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5e26\u6709\u975e\u6570\u5b57\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u626b\u63cf\u5668\uff0c\u4ee5\u83b7\u53d6\u53ea\u6709\u6574\u6570\u4f5c\u4e3a\u5904\u7406\u5bf9\u8c61\u7684\u6807\u8bb0\u3002<\/p>\n
            \/\/using regex to read only integers from a string source<\/span>\r\nString<\/span> data =<\/span> \"1a2b345c67d8,9#10\"<\/span>;<\/span>\r\nScanner<\/span> sc1 =<\/span> new<\/span> Scanner<\/span>(<\/span>data)<\/span>;<\/span>\r\n\r\n\/\/ setting non-digit regex as delimiter<\/span>\r\nsc1.<\/span>useDelimiter<\/span>(<\/span>\"\\\\D\"<\/span>)<\/span>;<\/span>\r\n\r\nwhile<\/span>(<\/span>sc1.<\/span>hasNext<\/span>(<\/span>)<\/span>)<\/span> {<\/span>\r\n\tSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>sc1.<\/span>next<\/span>(<\/span>)<\/span>)<\/span>;<\/span>\r\n}<\/span>\r\n\r\n\/\/ don't forget to close the scanner<\/span>\r\nsc1.<\/span>close<\/span>(<\/span>)<\/span>;<\/span>\r\n<\/code><\/pre>\n
            \u8f93\u51fa\uff1a<\/p>\n
            1\r\n2\r\n345\r\n67\r\n8\r\n9\r\n10\r\n<\/code><\/pre>\n
            \u7ed3\u8bba<\/h2>\n
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