Java\u3067\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u3080\u65b9\u6cd5\u306f\u305f\u304f\u3055\u3093\u3042\u308a\u307e\u3059\u3002\u9806\u756a\u306bJava\u3067\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u3080\u7570\u306a\u308b\u65b9\u6cd5\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
Java\u306b\u306f\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u305f\u3081\u306e\u3055\u307e\u3056\u307e\u306a\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u306f\u6587\u5b57\u3067\u69cb\u6210\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3001Reader\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001Java\u3067\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u305f\u3081\u306e\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30af\u30e9\u30b9\u3082\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\u3002<\/p>\n
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\u305d\u308c\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066Java\u3067\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u3080\u65b9\u6cd5\u3092\u793a\u3059\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u30d5\u30a1\u30a4\u30eb\u306e\u3059\u3079\u3066\u306e\u5185\u5bb9\u3092\u30d0\u30a4\u30c8\u914d\u5217\u306b\u8aad\u307f\u8fbc\u3080\u305f\u3081\u306bFiles\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002Files\u30af\u30e9\u30b9\u306b\u306f\u3001\u3059\u3079\u3066\u306e\u884c\u3092\u6587\u5b57\u5217\u306e\u30ea\u30b9\u30c8\u306b\u8aad\u307f\u8fbc\u3080\u30e1\u30bd\u30c3\u30c9\u3082\u3042\u308a\u307e\u3059\u3002Files\u30af\u30e9\u30b9\u306fJava 7\u3067\u5c0e\u5165\u3055\u308c\u3001\u30d5\u30a1\u30a4\u30eb\u306e\u5185\u5bb9\u3092\u3059\u3079\u3066\u8aad\u307f\u8fbc\u3080\u5834\u5408\u306b\u4fbf\u5229\u3067\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u5c0f\u3055\u306a\u30d5\u30a1\u30a4\u30eb\u306b\u53d6\u308a\u7d44\u3093\u3067\u304a\u308a\u3001\u3059\u3079\u3066\u306e\u30d5\u30a1\u30a4\u30eb\u5185\u5bb9\u304c\u30e1\u30e2\u30ea\u306b\u5fc5\u8981\u306a\u5834\u5408\u306b\u306e\u307f\u4f7f\u7528\u3059\u308b\u3079\u304d\u3067\u3059\u3002<\/p>\n
String fileName = \"\/Users\/scdev\/source.txt\";\r\nPath path = Paths.get(fileName);\r\nbyte[] bytes = Files.readAllBytes(path);\r\nList<String> allLines = Files.readAllLines(path, StandardCharsets.UTF_8);\r\n<\/code><\/pre>\nJava.io.FileReader\u3092\u4f7f\u3063\u3066\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u3080\u3002<\/h3>\n
FileReader\u3092\u4f7f\u7528\u3057\u3066BufferedReader\u3092\u53d6\u5f97\u3057\u3001\u305d\u306e\u5f8c\u30d5\u30a1\u30a4\u30eb\u3092\u884c\u3054\u3068\u306b\u8aad\u307f\u53d6\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002FileReader\u306f\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u30b5\u30dd\u30fc\u30c8\u305b\u305a\u3001\u30b7\u30b9\u30c6\u30e0\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3067\u52d5\u4f5c\u3059\u308b\u305f\u3081\u3001Java\u3067\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u53d6\u308b\u306b\u306f\u975e\u52b9\u7387\u306a\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n
String fileName = \"\/Users\/scdev\/source.txt\";\r\nFile file = new File(fileName);\r\nFileReader fr = new FileReader(file);\r\nBufferedReader br = new BufferedReader(fr);\r\nString line;\r\nwhile((line = br.readLine()) != null){\r\n \/\/process the line\r\n System.out.println(line);\r\n}\r\n<\/code><\/pre>\nJava.io.BufferedReader\u3092\u4f7f\u7528\u3057\u3066\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u3002<\/h3>\n
\u30d5\u30a1\u30a4\u30eb\u3092\u4e00\u884c\u305a\u3064\u8aad\u307f\u8fbc\u3093\u3067\u51e6\u7406\u3057\u305f\u3044\u5834\u5408\u306b\u306f\u3001BufferedReader\u304c\u4fbf\u5229\u3067\u3059\u3002\u5927\u304d\u306a\u30d5\u30a1\u30a4\u30eb\u306e\u51e6\u7406\u306b\u3082\u9069\u3057\u3066\u304a\u308a\u3001\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3082\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u3002BufferedReader\u306f\u540c\u671f\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u8907\u6570\u306e\u30b9\u30ec\u30c3\u30c9\u304b\u3089\u5b89\u5168\u306b\u8aad\u307f\u8fbc\u307f\u64cd\u4f5c\u304c\u884c\u3048\u307e\u3059\u3002BufferedReader\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30d0\u30c3\u30d5\u30a1\u30fc\u30b5\u30a4\u30ba\u306f8KB\u3067\u3059\u3002<\/p>\n
String fileName = \"\/Users\/scdev\/source.txt\";\r\nFile file = new File(fileName);\r\nFileInputStream fis = new FileInputStream(file);\r\nInputStreamReader isr = new InputStreamReader(fis, cs);\r\nBufferedReader br = new BufferedReader(isr);\r\n\r\nString line;\r\nwhile((line = br.readLine()) != null){\r\n \/\/process the line\r\n System.out.println(line);\r\n}\r\nbr.close();\r\n<\/code><\/pre>\nJava\u3067\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u3092\u30b9\u30ad\u30e3\u30ca\u30fc\u3092\u4f7f\u3063\u3066\u8aad\u307f\u8fbc\u3080\u3002<\/h3>\n
\u30d5\u30a1\u30a4\u30eb\u3092\u884c\u5358\u4f4d\u307e\u305f\u306fJava\u306e\u6b63\u898f\u8868\u73fe\u306b\u57fa\u3065\u3044\u3066\u8aad\u307f\u305f\u3044\u5834\u5408\u3001Scanner\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002Scanner\u306f\u3001\u30c7\u30ea\u30df\u30bf\u30d1\u30bf\u30fc\u30f3\u3092\u4f7f\u7528\u3057\u3066\u5165\u529b\u3092\u30c8\u30fc\u30af\u30f3\u306b\u5206\u5272\u3057\u307e\u3059\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u3001\u30c7\u30ea\u30df\u30bf\u306f\u7a7a\u767d\u306b\u30de\u30c3\u30c1\u3057\u307e\u3059\u3002\u6b21\u306b\u3001\u3055\u307e\u3056\u307e\u306anext\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u3053\u308c\u3089\u306e\u30c8\u30fc\u30af\u30f3\u3092\u7570\u306a\u308b\u578b\u306e\u5024\u306b\u5909\u63db\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002Scanner\u30af\u30e9\u30b9\u306f\u540c\u671f\u3055\u308c\u3066\u3044\u306a\u3044\u305f\u3081\u3001\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n
Path path = Paths.get(fileName);\r\nScanner scanner = new Scanner(path);\r\nSystem.out.println(\"Read text file using Scanner\");\r\n\/\/read line by line\r\nwhile(scanner.hasNextLine()){\r\n \/\/process each line\r\n String line = scanner.nextLine();\r\n System.out.println(line);\r\n}\r\nscanner.close();\r\n<\/code><\/pre>\nJava\u306e\u30d5\u30a1\u30a4\u30eb\u8aad\u307f\u8fbc\u307f\u306e\u4f8b<\/h3>\n
\u4ee5\u4e0b\u306b\u306f\u3001Java\u3067\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u65b9\u6cd5\u3092\u793a\u3059\u4f8b\u984c\u30af\u30e9\u30b9\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\u984c\u30e1\u30bd\u30c3\u30c9\u3067\u306f\u3001Scanner\u3001Files\u3001\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u30b5\u30dd\u30fc\u30c8\u4ed8\u304d\u306eBufferedReader\u3001\u305d\u3057\u3066FileReader\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
package com.scdev.files;\r\n\r\nimport java.io.BufferedReader;\r\nimport java.io.File;\r\nimport java.io.FileInputStream;\r\nimport java.io.FileReader;\r\nimport java.io.IOException;\r\nimport java.io.InputStreamReader;\r\nimport java.nio.charset.Charset;\r\nimport java.nio.charset.StandardCharsets;\r\nimport java.nio.file.Files;\r\nimport java.nio.file.Path;\r\nimport java.nio.file.Paths;\r\nimport java.util.List;\r\nimport java.util.Scanner;\r\n\r\npublic class JavaReadFile {\r\n\r\n public static void main(String[] args) throws IOException {\r\n String fileName = \"\/Users\/scdev\/source.txt\";\r\n \r\n \/\/using Java 7 Files class to process small files, get complete file data\r\n readUsingFiles(fileName);\r\n \r\n \/\/using Scanner class for large files, to read line by line\r\n readUsingScanner(fileName);\r\n \r\n \/\/read using BufferedReader, to read line by line\r\n readUsingBufferedReader(fileName);\r\n readUsingBufferedReaderJava7(fileName, StandardCharsets.UTF_8);\r\n readUsingBufferedReader(fileName, StandardCharsets.UTF_8);\r\n \r\n \/\/read using FileReader, no encoding support, not efficient\r\n readUsingFileReader(fileName);\r\n }\r\n\r\n private static void readUsingFileReader(String fileName) throws IOException {\r\n File file = new File(fileName);\r\n FileReader fr = new FileReader(file);\r\n BufferedReader br = new BufferedReader(fr);\r\n String line;\r\n System.out.println(\"Reading text file using FileReader\");\r\n while((line = br.readLine()) != null){\r\n \/\/process the line\r\n System.out.println(line);\r\n }\r\n br.close();\r\n fr.close();\r\n \r\n }\r\n\r\n private static void readUsingBufferedReader(String fileName, Charset cs) throws IOException {\r\n File file = new File(fileName);\r\n FileInputStream fis = new FileInputStream(file);\r\n InputStreamReader isr = new InputStreamReader(fis, cs);\r\n BufferedReader br = new BufferedReader(isr);\r\n String line;\r\n System.out.println(\"Read text file using InputStreamReader\");\r\n while((line = br.readLine()) != null){\r\n \/\/process the line\r\n System.out.println(line);\r\n }\r\n br.close();\r\n \r\n }\r\n\r\n private static void readUsingBufferedReaderJava7(String fileName, Charset cs) throws IOException {\r\n Path path = Paths.get(fileName);\r\n BufferedReader br = Files.newBufferedReader(path, cs);\r\n String line;\r\n System.out.println(\"Read text file using BufferedReader Java 7 improvement\");\r\n while((line = br.readLine()) != null){\r\n \/\/process the line\r\n System.out.println(line);\r\n }\r\n br.close();\r\n }\r\n\r\n private static void readUsingBufferedReader(String fileName) throws IOException {\r\n File file = new File(fileName);\r\n FileReader fr = new FileReader(file);\r\n BufferedReader br = new BufferedReader(fr);\r\n String line;\r\n System.out.println(\"Read text file using BufferedReader\");\r\n while((line = br.readLine()) != null){\r\n \/\/process the line\r\n System.out.println(line);\r\n }\r\n \/\/close resources\r\n br.close();\r\n fr.close();\r\n }\r\n\r\n private static void readUsingScanner(String fileName) throws IOException {\r\n Path path = Paths.get(fileName);\r\n Scanner scanner = new Scanner(path);\r\n System.out.println(\"Read text file using Scanner\");\r\n \/\/read line by line\r\n while(scanner.hasNextLine()){\r\n \/\/process each line\r\n String line = scanner.nextLine();\r\n System.out.println(line);\r\n }\r\n scanner.close();\r\n }\r\n\r\n private static void readUsingFiles(String fileName) throws IOException {\r\n Path path = Paths.get(fileName);\r\n \/\/read file to byte array\r\n byte[] bytes = Files.readAllBytes(path);\r\n System.out.println(\"Read text file using Files class\");\r\n \/\/read file to String list\r\n @SuppressWarnings(\"unused\")\r\n\t\tList<String> allLines = Files.readAllLines(path, StandardCharsets.UTF_8);\r\n System.out.println(new String(bytes));\r\n }\r\n\r\n}\r\n<\/code><\/pre>\n\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u8981\u4ef6\u306b\u5fdc\u3058\u3066\u3001\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u53d6\u308b\u305f\u3081\u306bScanner\u3001BufferedReader\u3001\u307e\u305f\u306fFiles\u306e\u3069\u308c\u3092\u4f7f\u7528\u3059\u308b\u304b\u9078\u629e\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001\u5358\u306b\u30d5\u30a1\u30a4\u30eb\u3092\u8a18\u9332\u3059\u308b\u5834\u5408\u306f\u3001Files\u3068BufferedReader\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002\u3082\u3057\u533a\u5207\u308a\u6587\u5b57\u306b\u57fa\u3065\u3044\u3066\u30d5\u30a1\u30a4\u30eb\u3092\u89e3\u6790\u3059\u308b\u5834\u5408\u306f\u3001Scanner\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3079\u304d\u3067\u3059\u3002\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3092\u7d42\u3048\u308b\u524d\u306b\u3001RandomAccessFile\u306b\u3064\u3044\u3066\u3082\u89e6\u308c\u3066\u304a\u304d\u307e\u3059\u3002\u3053\u308c\u3092\u4f7f\u7528\u3057\u3066Java\u3067\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u53d6\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
RandomAccessFile file = new RandomAccessFile(\"\/Users\/scdev\/Downloads\/myfile.txt\", \"r\");\r\nString str;\r\n\r\nwhile ((str = file.readLine()) != null) {\r\n\tSystem.out.println(str);\r\n}\r\nfile.close();\r\n<\/code><\/pre>\n\u305d\u308c\u304c\u3001Java\u306e\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u8aad\u307f\u8fbc\u307f\u306e\u4f8b\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5168\u3066\u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
Java\u3067\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u3080\u65b9\u6cd5\u306f\u305f\u304f\u3055\u3093\u3042\u308a\u307e\u3059\u3002\u9806\u756a\u306bJava\u3067\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u3080\u7570\u306a\u308b\u65b9\u6cd5\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002 Java\u3067\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u3080 Java\u306b\u306f\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u305f\u3081\u306e\u3055\u307e\u3056\u307e\u306a\u65b9\u6cd5\u304c\u3042 […]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-736","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"\n
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