{"id":748,"date":"2023-03-30T21:21:13","date_gmt":"2023-05-03T06:52:25","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%81%abjava%e3%81%a7%e8%bf%bd%e8%a8%98%e3%81%99%e3%82%8b%e3%80%82\/"},"modified":"2025-08-01T02:08:24","modified_gmt":"2025-07-31T17:08:24","slug":"%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%81%abjava%e3%81%a7%e8%bf%bd%e8%a8%98%e3%81%99%e3%82%8b%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%81%abjava%e3%81%a7%e8%bf%bd%e8%a8%98%e3%81%99%e3%82%8b%e3%80%82\/","title":{"rendered":"\u30d5\u30a1\u30a4\u30eb\u306bJava\u3067\u8ffd\u8a18\u3059\u308b\u3002"},"content":{"rendered":"

\u4eca\u65e5\u306f\u3001Java\u3067\u30d5\u30a1\u30a4\u30eb\u306b\u8ffd\u8a18\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3059\u3002Java\u3067\u306e\u30d5\u30a1\u30a4\u30eb\u3078\u306e\u8ffd\u8a18\u306f\u4e00\u822c\u7684\u306aJava IO\u64cd\u4f5c\u3067\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u4f55\u304b\u3092\u30b5\u30fc\u30d0\u30fc\u30ed\u30b0\u306b\u5370\u5237\u3059\u308b\u3068\u3001\u65e2\u5b58\u306e\u30d5\u30a1\u30a4\u30eb\u306b\u8ffd\u8a18\u3055\u308c\u307e\u3059\u3002<\/p>\n

\u30d5\u30a1\u30a4\u30eb\u306bJava\u3067\u8ffd\u8a18\u3059\u308b<\/h2>\n

\u4ee5\u4e0b\u306e\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001Java\u3067\u30d5\u30a1\u30a4\u30eb\u306b\u8ffd\u8a18\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

    \n
  1. \n
      Java\u3067FileWriter\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u306b\u8ffd\u8a18\u3059\u308b<\/ol>\n<\/li>\n<\/ol>\n

       <\/p>\n

        \n
      1. \n
          Java\u3067BufferedWriter\u3092\u4f7f\u7528\u3057\u3066\u65e2\u5b58\u306e\u30d5\u30a1\u30a4\u30eb\u306b\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u8ffd\u8a18\u3059\u308b<\/ol>\n<\/li>\n<\/ol>\n

           <\/p>\n

            \n
          1. \n
              Java\u3067PrintWriter\u3092\u4f7f\u7528\u3057\u3066\u30c6\u30ad\u30b9\u30c8\u3092\u30d5\u30a1\u30a4\u30eb\u306b\u8ffd\u8a18\u3059\u308b<\/ol>\n<\/li>\n<\/ol>\n

               <\/p>\n

                Java\u3067FileOutputStream\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u306b\u8ffd\u8a18\u3059\u308b<\/ol>\n
                \"java<\/div>\n

                \u4ee5\u4e0b\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u65e5\u672c\u8a9e\u3067\u81ea\u7136\u306b\u8a00\u3044\u63db\u3048\u3066\u304f\u3060\u3055\u3044\u3002\u4e00\u3064\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u304c\u5fc5\u8981\u3067\u3059\uff1a
                \n\u300cJava\u306eFileWriter\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u306b\u8ffd\u52a0\u3059\u308b\u300d<\/h3>\n

                \u4ee5\u4e0b\u306f\u3001Java\u306eFileWriter\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u306b\u8ffd\u8a18\u3059\u308b\u305f\u3081\u306e\u77ed\u3044\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u3059\u3002\u5f8c\u3067\u5b8c\u5168\u306aJava\u306e\u30d5\u30a1\u30a4\u30eb\u306b\u8ffd\u8a18\u3059\u308b\u4f8b\u3092\u3054\u7d39\u4ecb\u3044\u305f\u3057\u307e\u3059\u3002<\/p>\n

                File file = new File(\"append.txt\");\r\nFileWriter fr = new FileWriter(file, true);\r\nfr.write(\"data\");\r\nfr.close();\r\n<\/code><\/pre>\n
                BufferedWriter\u3092\u4f7f\u7528\u3057\u3066\u3001\u65e2\u5b58\u306e\u30d5\u30a1\u30a4\u30eb\u306bJava\u306e\u5185\u5bb9\u3092\u8ffd\u52a0\u3059\u308b\u3002<\/h3>\n
                File file = new File(\"append.txt\");\r\nFileWriter fr = new FileWriter(file, true);\r\nBufferedWriter br = new BufferedWriter(fr);\r\nbr.write(\"data\");\r\n\r\nbr.close();\r\nfr.close();\r\n<\/code><\/pre>\n
                Java\u306ePrintWriter\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u306b\u30c6\u30ad\u30b9\u30c8\u3092\u8ffd\u52a0\u3059\u308b<\/h3>\n
                \u79c1\u305f\u3061\u306f\u3001Java\u3067\u30d5\u30a1\u30a4\u30eb\u306b\u8ffd\u8a18\u3059\u308b\u305f\u3081\u306bPrintWriter\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n
                File file = new File(\"append.txt\");\r\nFileWriter fr = new FileWriter(file, true);\r\nBufferedWriter br = new BufferedWriter(fr);\r\nPrintWriter pr = new PrintWriter(br);\r\npr.println(\"data\");\r\npr.close();\r\nbr.close();\r\nfr.close();\r\n<\/code><\/pre>\n
                Java\u306eFileOutputStream\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u306b\u8ffd\u8a18\u3059\u308b<\/h3>\n
                \u751f\u30c7\u30fc\u30bf\u3001\u30d0\u30a4\u30ca\u30ea\u30c7\u30fc\u30bf\u3001\u753b\u50cf\u3001\u30d3\u30c7\u30aa\u306a\u3069\u306e\u30d5\u30a1\u30a4\u30eb\u306b\u30c7\u30fc\u30bf\u3092\u8ffd\u8a18\u3059\u308b\u5834\u5408\u306f\u3001FileOutputStream\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
                OutputStream os = new FileOutputStream(new File(\"append.txt\"), true);\r\nos.write(\"data\".getBytes(), 0, \"data\".length());\r\nos.close();\r\n<\/code><\/pre>\n
                Java\u306e\u30d5\u30a1\u30a4\u30eb\u3078\u306e\u8ffd\u52a0\u4f8b<\/h3>\n
                \u4e0a\u8a18\u3067\u8b70\u8ad6\u3057\u305f\u3059\u3079\u3066\u306e\u7570\u306a\u308b\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u8868\u793a\u3059\u308b\u3001\u6700\u7d42\u306eJava\u30d5\u30a1\u30a4\u30eb\u8ffd\u52a0\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u3053\u3061\u3089\u3067\u3059\u3002<\/p>\n
                package com.scdev.files;\r\n\r\nimport java.io.BufferedWriter;\r\nimport java.io.File;\r\nimport java.io.FileOutputStream;\r\nimport java.io.FileWriter;\r\nimport java.io.IOException;\r\nimport java.io.OutputStream;\r\nimport java.io.PrintWriter;\r\n\r\npublic class JavaAppendToFile {\r\n\r\n\t\/**\r\n\t * Java append to file example\r\n\t * \r\n\t * @param args\r\n\t *\/\r\n\tpublic static void main(String[] args) {\r\n\t\tString filePath = \"\/Users\/scdev\/Downloads\/append.txt\";\r\n\r\n\t\tString appendText = \"This String will be appended to the file, Byte=0x0A 0xFF\";\r\n\r\n\t\tappendUsingFileWriter(filePath, appendText);\r\n\r\n\t\tappendUsingBufferedWriter(filePath, appendText, 2);\r\n\r\n\t\tappendUsingPrintWriter(filePath, appendText);\r\n\r\n\t\tappendUsingFileOutputStream(filePath, appendText);\r\n\t}\r\n\r\n\tprivate static void appendUsingPrintWriter(String filePath, String text) {\r\n\t\tFile file = new File(filePath);\r\n\t\tFileWriter fr = null;\r\n\t\tBufferedWriter br = null;\r\n\t\tPrintWriter pr = null;\r\n\t\ttry {\r\n\t\t\t\/\/ to append to file, you need to initialize FileWriter using below constructor\r\n\t\t\tfr = new FileWriter(file, true);\r\n\t\t\tbr = new BufferedWriter(fr);\r\n\t\t\tpr = new PrintWriter(br);\r\n\t\t\tpr.println(text);\r\n\t\t} catch (IOException e) {\r\n\t\t\te.printStackTrace();\r\n\t\t} finally {\r\n\t\t\ttry {\r\n\t\t\t\tpr.close();\r\n\t\t\t\tbr.close();\r\n\t\t\t\tfr.close();\r\n\t\t\t} catch (IOException e) {\r\n\t\t\t\te.printStackTrace();\r\n\t\t\t}\r\n\t\t}\r\n\t}\r\n\r\n\t\/**\r\n\t * Use Stream for java append to file when you are dealing with raw data, binary\r\n\t * data\r\n\t * \r\n\t * @param data\r\n\t *\/\r\n\tprivate static void appendUsingFileOutputStream(String fileName, String data) {\r\n\t\tOutputStream os = null;\r\n\t\ttry {\r\n\t\t\t\/\/ below true flag tells OutputStream to append\r\n\t\t\tos = new FileOutputStream(new File(fileName), true);\r\n\t\t\tos.write(data.getBytes(), 0, data.length());\r\n\t\t} catch (IOException e) {\r\n\t\t\te.printStackTrace();\r\n\t\t} finally {\r\n\t\t\ttry {\r\n\t\t\t\tos.close();\r\n\t\t\t} catch (IOException e) {\r\n\t\t\t\te.printStackTrace();\r\n\t\t\t}\r\n\t\t}\r\n\t}\r\n\r\n\t\/**\r\n\t * Use BufferedWriter when number of write operations are more\r\n\t * \r\n\t * @param filePath\r\n\t * @param text\r\n\t * @param noOfLines\r\n\t *\/\r\n\tprivate static void appendUsingBufferedWriter(String filePath, String text, int noOfLines) {\r\n\t\tFile file = new File(filePath);\r\n\t\tFileWriter fr = null;\r\n\t\tBufferedWriter br = null;\r\n\t\ttry {\r\n\t\t\t\/\/ to append to file, you need to initialize FileWriter using below constructor\r\n\t\t\tfr = new FileWriter(file, true);\r\n\t\t\tbr = new BufferedWriter(fr);\r\n\t\t\tfor (int i = 0; i < noOfLines; i++) {\r\n\t\t\t\tbr.newLine();\r\n\t\t\t\t\/\/ you can use write or append method\r\n\t\t\t\tbr.write(text);\r\n\t\t\t}\r\n\r\n\t\t} catch (IOException e) {\r\n\t\t\te.printStackTrace();\r\n\t\t} finally {\r\n\t\t\ttry {\r\n\t\t\t\tbr.close();\r\n\t\t\t\tfr.close();\r\n\t\t\t} catch (IOException e) {\r\n\t\t\t\te.printStackTrace();\r\n\t\t\t}\r\n\t\t}\r\n\t}\r\n\r\n\t\/**\r\n\t * Use FileWriter when number of write operations are less\r\n\t * \r\n\t * @param filePath\r\n\t * @param text\r\n\t * @param noOfLines\r\n\t *\/\r\n\tprivate static void appendUsingFileWriter(String filePath, String text) {\r\n\t\tFile file = new File(filePath);\r\n\t\tFileWriter fr = null;\r\n\t\ttry {\r\n\t\t\t\/\/ Below constructor argument decides whether to append or override\r\n\t\t\tfr = new FileWriter(file, true);\r\n\t\t\tfr.write(text);\r\n\r\n\t\t} catch (IOException e) {\r\n\t\t\te.printStackTrace();\r\n\t\t} finally {\r\n\t\t\ttry {\r\n\t\t\t\tfr.close();\r\n\t\t\t} catch (IOException e) {\r\n\t\t\t\te.printStackTrace();\r\n\t\t\t}\r\n\t\t}\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
                Java\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u306e\u30d5\u30a1\u30a4\u30eb\u3078\u306e\u66f8\u304d\u8fbc\u307f\u306f\u4ee5\u4e0a\u3067\u3059\u3002<\/p>\n
                \u79c1\u305f\u3061\u306eGitHub\u30ea\u30dd\u30b8\u30c8\u30ea\u304b\u3089\u3001\u3082\u3063\u3068JavaIO\u306e\u4f8b\u3092\u30c1\u30a7\u30c3\u30af\u30a2\u30a6\u30c8\u3067\u304d\u307e\u3059\u3002<\/p>\n
                \u53c2\u8003\u6587\u732e\uff1a<\/p>\n
                  \n
                • PrintWriter API Doc<\/li>\n
                • FileWriter API Doc<\/li>\n
                • BufferedWriter API Doc<\/li>\n
                • FileOutputStream API Doc<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
                  \u4eca\u65e5\u306f\u3001Java\u3067\u30d5\u30a1\u30a4\u30eb\u306b\u8ffd\u8a18\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3059\u3002Java\u3067\u306e\u30d5\u30a1\u30a4\u30eb\u3078\u306e\u8ffd\u8a18\u306f\u4e00\u822c\u7684\u306aJava IO\u64cd\u4f5c\u3067\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u4f55\u304b\u3092\u30b5\u30fc\u30d0\u30fc\u30ed\u30b0\u306b\u5370\u5237\u3059\u308b\u3068\u3001\u65e2\u5b58\u306e\u30d5\u30a1\u30a4\u30eb\u306b\u8ffd\u8a18\u3055\u308c\u307e\u3059\u3002 \u30d5\u30a1\u30a4\u30eb\u306bJava\u3067\u8ffd […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-748","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"\n\u30d5\u30a1\u30a4\u30eb\u306bJava\u3067\u8ffd\u8a18\u3059\u308b\u3002 - 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