OpenCSV\u306f\u8efd\u91cf\u306aJava CSV\u30d1\u30fc\u30b5\u30fc\u3067\u3059\u3002\u4eca\u65e5\u306f\u3001CSV\u30d1\u30fc\u30b9\u306e\u305f\u3081\u306eOpenCSV\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
OpenCSV\u306f\u3001CSV\u89e3\u6790\u306e\u305f\u3081\u306e\u307b\u3068\u3093\u3069\u306e\u57fa\u672c\u7684\u306a\u6a5f\u80fd\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002OpenCSV\u306f\u3001Java\u306b\u7d44\u307f\u8fbc\u307e\u308c\u305fCSV\u30d1\u30fc\u30b5\u30fc\u304c\u306a\u3044\u305f\u3081\u3001\u3088\u308a\u4eba\u6c17\u304c\u3042\u308a\u307e\u3059\u3002OpenCSV\u306eCSV\u30d1\u30fc\u30b5\u30fc\u306e\u4e2d\u3067\u3082\u91cd\u8981\u306a\u30af\u30e9\u30b9\u306b\u306f\u3001\u6b21\u306e\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
<\/p>\n
<\/p>\n
<\/p>\n
\u4ee5\u4e0b\u306eMaven\u4f9d\u5b58\u95a2\u4fc2\u3092\u4f7f\u7528\u3057\u3066\u3001OpenCSV\u306ejar\u30d5\u30a1\u30a4\u30eb\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
<dependency>\r\n\t<groupId>com.opencsv<\/groupId>\r\n\t<artifactId>opencsv<\/artifactId>\r\n\t<version>3.8<\/version>\r\n<\/dependency>\r\n<\/code><\/pre>\n\u4f8b\u984c\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u898b\u308b\u524d\u306b\u3001\u30c7\u30e2\u7528\u306eCSV\u30c7\u30fc\u30bf\u3068\u5bfe\u5fdc\u3059\u308bJava Bean\u304c\u5fc5\u8981\u3067\u3059\u3002\u4ee5\u4e0b\u306f\u30b5\u30f3\u30d7\u30eb\u306eCSV\u30d5\u30a1\u30a4\u30eb\u3067\u3042\u308b\u3001emps.csv\u3067\u3059\u3002<\/p>\n
1,Pankaj Kumar,20,India\r\n2,David Dan,40,USA\r\n3,Lisa Ray,28,Germany\r\n<\/code><\/pre>\n\u4ee5\u4e0b\u306f\u3001CSV\u30c7\u30fc\u30bf\u3092\u4fdd\u6301\u3059\u308b\u305f\u3081\u306e\u79c1\u305f\u3061\u306eJava Bean\u30af\u30e9\u30b9\u3067\u3059\u3002<\/p>\n
package com.scdev.csv.model;\r\n\r\npublic class Employee {\r\n\r\n\tprivate String id;\r\n\tprivate String name;\r\n\tprivate String age;\r\n\tprivate String country;\r\n\r\n\tpublic String getId() {\r\n\t\treturn id;\r\n\t}\r\n\r\n\tpublic void setId(String 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 getAge() {\r\n\t\treturn age;\r\n\t}\r\n\r\n\tpublic void setAge(String age) {\r\n\t\tthis.age = age;\r\n\t}\r\n\r\n\tpublic String getCountry() {\r\n\t\treturn country;\r\n\t}\r\n\r\n\tpublic void setCountry(String country) {\r\n\t\tthis.country = country;\r\n\t}\r\n\r\n\t@Override\r\n\tpublic String toString() {\r\n\t\treturn \"{\" + id + \"::\" + name + \"::\" + age + \"::\" + country + \"}\";\r\n\t}\r\n}\r\n<\/code><\/pre>\nCSV\u306e\u30d1\u30fc\u30b9\u3068CSV\u306e\u66f8\u304d\u8fbc\u307f\u306e\u4e00\u822c\u7684\u306a\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
CSV\u30ea\u30fc\u30c0\u30fc<\/h3>\n
\u6700\u521d\u306eCSVReader\u306e\u4f8b\u306f\u3001CSV\u30d5\u30a1\u30a4\u30eb\u306e\u884c\u3092\u4e00\u3064\u305a\u3064\u8aad\u307f\u8fbc\u3093\u3067\u3001\u305d\u308c\u3092\u5f93\u696d\u54e1\u306e\u30ea\u30b9\u30c8\u306b\u5909\u63db\u3059\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n
package com.scdev.csv.opencsv.parser;\r\n\r\nimport java.io.FileReader;\r\nimport java.io.IOException;\r\nimport java.util.ArrayList;\r\nimport java.util.List;\r\n\r\nimport com.scdev.csv.model.Employee;\r\nimport com.opencsv.CSVReader;\r\n\r\n\/**\r\n * OpenCSV CSVReader Example, Read line by line\r\n * \r\n * @author scdev\r\n *\r\n *\/\r\npublic class OpenCSVReaderLineByLineExample {\r\n\r\n\tpublic static void main(String[] args) throws IOException {\r\n\r\n\t\tCSVReader reader = new CSVReader(new FileReader(\"emps.csv\"), ',');\r\n\r\n\t\tList<Employee> emps = new ArrayList<Employee>();\r\n\r\n\t\t\/\/ read line by line\r\n\t\tString[] record = null;\r\n\r\n\t\twhile ((record = reader.readNext()) != null) {\r\n\t\t\tEmployee emp = new Employee();\r\n\t\t\temp.setId(record[0]);\r\n\t\t\temp.setName(record[1]);\r\n\t\t\temp.setAge(record[2]);\r\n\t\t\temp.setCountry(record[3]);\r\n\t\t\temps.add(emp);\r\n\t\t}\r\n\r\n\t\tSystem.out.println(emps);\r\n\t\t\r\n\t\treader.close();\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n\u4e0a\u8a18\u306eCSVReader\u306e\u4f8b\u306f\u3001\u7406\u89e3\u3057\u3084\u3059\u3044\u3067\u3059\u3002\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\u306f\u3001\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3092\u907f\u3051\u308b\u305f\u3081\u306bCSVReader\u3092\u9589\u3058\u308b\u3053\u3068\u3067\u3059\u3002\u307e\u305f\u3001\u4ed6\u306e\u6587\u5b57\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u306b\u5099\u3048\u3066\u533a\u5207\u308a\u6587\u5b57\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u6b21\u306eCSVReader\u306e\u4f8b\u306f\u3001CSVReader\u306ereadAll()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u30c7\u30fc\u30bf\u3092\u4e00\u5ea6\u306b\u3059\u3079\u3066\u8aad\u307f\u53d6\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n
package com.scdev.csv.opencsv.parser;\r\n\r\nimport java.io.FileReader;\r\nimport java.io.IOException;\r\nimport java.util.ArrayList;\r\nimport java.util.Iterator;\r\nimport java.util.List;\r\n\r\nimport com.scdev.csv.model.Employee;\r\nimport com.opencsv.CSVReader;\r\n\r\n\/**\r\n * OpenCSV CSVReader Example, Read all at once\r\n * \r\n * @author scdev\r\n *\r\n *\/\r\npublic class OpenCSVReaderReadAllExample {\r\n\r\n\tpublic static void main(String[] args) throws IOException {\r\n\t\tCSVReader reader = new CSVReader(new FileReader(\"emps.csv\"), ',');\r\n\r\n\t\tList<Employee> emps = new ArrayList<Employee>();\r\n\r\n\t\tList<String[]> records = reader.readAll();\r\n\r\n\t\tIterator<String[]> iterator = records.iterator();\r\n\r\n\t\twhile (iterator.hasNext()) {\r\n\t\t\tString[] record = iterator.next();\r\n\t\t\tEmployee emp = new Employee();\r\n\t\t\temp.setId(record[0]);\r\n\t\t\temp.setName(record[1]);\r\n\t\t\temp.setAge(record[2]);\r\n\t\t\temp.setCountry(record[3]);\r\n\t\t\temps.add(emp);\r\n\t\t}\r\n\r\n\t\tSystem.out.println(emps);\r\n\r\n\t\treader.close();\r\n\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\nCsvToBean \u306e\u5185\u5bb9\u3092\u65e5\u672c\u8a9e\u3067\u8aac\u660e\u3059\u308b\u3068\u3001
\n\u300cCsvToBean\u306f\u3001CSV\u5f62\u5f0f\u306e\u30c7\u30fc\u30bf\u3092Java\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u63db\u3059\u308b\u305f\u3081\u306e\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u3059\u3002\u300d<\/h3>\n
\u307b\u3068\u3093\u3069\u306e\u5834\u5408\u3001CSV\u3092Java\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5909\u63db\u3057\u305f\u3044\u3067\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u5834\u5408\u306f\u3001CsvToBean\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u5f93\u696d\u54e1CSV\u30d5\u30a1\u30a4\u30eb\u3092\u5f93\u696d\u54e1\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30ea\u30b9\u30c8\u306b\u5909\u63db\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3059\u7c21\u5358\u306a\u4f8b\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
package com.scdev.csv.opencsv.parser;\r\n\r\nimport java.io.FileReader;\r\nimport java.io.IOException;\r\nimport java.util.List;\r\n\r\nimport com.scdev.csv.model.Employee;\r\nimport com.opencsv.CSVReader;\r\nimport com.opencsv.bean.ColumnPositionMappingStrategy;\r\nimport com.opencsv.bean.CsvToBean;\r\nimport com.opencsv.bean.HeaderColumnNameMappingStrategy;\r\n\r\npublic class OpenCSVParseToBeanExample {\r\n\r\n\tpublic static void main(String[] args) throws IOException {\r\n\t\t\r\n\t\tCSVReader reader = new CSVReader(new FileReader(\"emps.csv\"), ',');\r\n\t\t\r\n\t\tColumnPositionMappingStrategy<Employee> beanStrategy = new ColumnPositionMappingStrategy<Employee>();\r\n\t\tbeanStrategy.setType(Employee.class);\r\n\t\tbeanStrategy.setColumnMapping(new String[] {\"id\",\"name\",\"age\",\"country\"});\r\n\t\t\r\n\t\tCsvToBean<Employee> csvToBean = new CsvToBean<Employee>();\r\n\t\t\r\n\t\tList<Employee> emps = csvToBean.parse(beanStrategy, reader);\r\n\t\t\r\n\t\tSystem.out.println(emps);\r\n\t\t\r\n\t}\r\n}\r\n<\/code><\/pre>\nColumnPositionMappingStrategy\u306f\u3001CSV\u30c7\u30fc\u30bf\u306e\u884c\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092Employee\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u30de\u30c3\u30d4\u30f3\u30b0\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u6642\u306b\u306fCSV\u30d5\u30a1\u30a4\u30eb\u306b\u30d8\u30c3\u30c0\u30fc\u30c7\u30fc\u30bf\u3082\u542b\u307e\u308c\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306aemps1.csv\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
ID,NAME,age, country\r\n1,Pankaj Kumar,20,India\r\n2,David Dan,40,USA\r\n3,Lisa Ray,28,Germany\r\n<\/code><\/pre>\n\u3053\u306e\u5834\u5408\u3001MappingStrategy\u306e\u5b9f\u88c5\u3068\u3057\u3066HeaderColumnNameMappingStrategy\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u3001HeaderColumnNameMappingStrategy\u306e\u4f7f\u7528\u3092\u793a\u3059\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/p>\n
\/\/ returning list of Employee for CSVWriter example demo data\r\npublic static List<Employee> parseCSVWithHeader() throws IOException {\r\n\tCSVReader reader = new CSVReader(new FileReader(\"emps1.csv\"), ',');\r\n\t\r\n\tHeaderColumnNameMappingStrategy<Employee> beanStrategy = new HeaderColumnNameMappingStrategy<Employee>();\r\n\tbeanStrategy.setType(Employee.class);\r\n\t\r\n\tCsvToBean<Employee> csvToBean = new CsvToBean<Employee>();\r\n\tList<Employee> emps = csvToBean.parse(beanStrategy, reader);\r\n\t\r\n\tSystem.out.println(emps);\r\n\treader.close();\r\n\t\r\n\treturn emps;\r\n}\r\n<\/code><\/pre>\nCSVWriter\u3092\u65e5\u672c\u8a9e\u3067\u8868\u73fe\u3059\u308b\u3068\u3001\u300cCSV\u306e\u66f8\u304d\u8fbc\u307f\u8005\u300d\u3068\u306a\u308a\u307e\u3059\u3002<\/h3>\n
CSVWriter\u306e\u4f8b\u3092\u898b\u3066\u3001Java\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092CSV\u3078\u66f8\u304d\u8fbc\u3080\u65b9\u6cd5\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u5148\u7a0b\u5b9a\u7fa9\u3057\u305fparseCSVWithHeader()\u3092\u518d\u5229\u7528\u3057\u307e\u3059\u3002<\/p>\n
package com.scdev.csv.opencsv.parser;\r\n\r\nimport java.io.IOException;\r\nimport java.io.StringWriter;\r\nimport java.util.ArrayList;\r\nimport java.util.Iterator;\r\nimport java.util.List;\r\n\r\nimport com.scdev.csv.model.Employee;\r\nimport com.opencsv.CSVWriter;\r\n\r\npublic class OpenCSVWriterExample {\r\n\r\n\tpublic static void main(String[] args) throws IOException {\r\n\t\tStringWriter writer = new StringWriter();\r\n\t\t\r\n\t\t\/\/using custom delimiter and quote character\r\n\t\tCSVWriter csvWriter = new CSVWriter(writer, '#', '\\'');\r\n\r\n\t\tList<Employee> emps = OpenCSVParseToBeanExample.parseCSVWithHeader();\r\n\r\n\t\tList<String[]> data = toStringArray(emps);\r\n\r\n\t\tcsvWriter.writeAll(data);\r\n\r\n\t\tcsvWriter.close();\r\n\t\t\r\n\t\tSystem.out.println(writer);\r\n\r\n\t}\r\n\r\n\tprivate static List<String[]> toStringArray(List<Employee> emps) {\r\n\t\tList<String[]> records = new ArrayList<String[]>();\r\n\r\n\t\t\/\/ adding header record\r\n\t\trecords.add(new String[] { \"ID\", \"Name\", \"Age\", \"Country\" });\r\n\r\n\t\tIterator<Employee> it = emps.iterator();\r\n\t\twhile (it.hasNext()) {\r\n\t\t\tEmployee emp = it.next();\r\n\t\t\trecords.add(new String[] { emp.getId(), emp.getName(), emp.getAge(), emp.getCountry() });\r\n\t\t}\r\n\t\treturn records;\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\nCSV\u30c7\u30fc\u30bf\u3092\u66f8\u304f\u969b\u306b\u3001\u30ab\u30b9\u30bf\u30e0\u533a\u5207\u308a\u6587\u5b57\u306e\u4f7f\u7528\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u307e\u305f\u3001CSV\u306e\u5217\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3067\u4f7f\u7528\u3059\u308b\u5f15\u7528\u7b26\u306e\u6587\u5b57\u3082\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u4e0a\u8a18\u306eCSVWriter\u306e\u4f8b\u3067\u306f\u3001\u6b21\u306e\u51fa\u529b\u304c\u751f\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n
[{1::Pankaj Kumar::20::India}, {2::David Dan::40::USA}, {3::Lisa Ray::28::Germany}]\r\n'ID'#'Name'#'Age'#'Country'\r\n'1'#'Pankaj Kumar'#'20'#'India'\r\n'2'#'David Dan'#'40'#'USA'\r\n'3'#'Lisa Ray'#'28'#'Germany'\r\n<\/code><\/pre>\nOpenCSV\u306eCSVWriter\u3092\u4f7f\u7528\u3057\u3066\u3001ResultSet\u3092\u958b\u304f\u3002<\/h3>\n
\u6642\u3005\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u30c6\u30fc\u30d6\u30eb\u30c7\u30fc\u30bf\u3092\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u3068\u3057\u3066CSV\u30d5\u30a1\u30a4\u30eb\u306b\u51fa\u529b\u3057\u305f\u3044\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u5834\u5408\u306f\u3001CSVWriter\u306ewriteAll(ResultSet rs, boolean includeColumnNames)\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3048\u3070\u7c21\u5358\u306b\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
OpenCSV\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3<\/h3>\n
OpenCSV\u306f\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u30d9\u30fc\u30b9\u306e\u30b5\u30dd\u30fc\u30c8\u3082\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002OpenCSV\u306e\u4e00\u90e8\u306e\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306b\u306f\u3001\u6b21\u306e\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\n- CsvBindByName: for binding between a column name of the CSV input and a field in a bean.<\/li>\n
- CsvBindByPosition: for binding between a column number of the CSV input and a field in a bean.<\/li>\n
- CsvDate: for time based conversion.<\/li>\n<\/ul>\n
\u305f\u3060\u3057\u3001OpenCSV\u306e\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306f\u907f\u3051\u305f\u3044\u3067\u3059\u3002\u305d\u3046\u3059\u308b\u3068\u3001\u30b3\u30fc\u30c9\u306fOpenCSV\u3068\u5bc6\u306b\u7d50\u3073\u3064\u3044\u3066\u3057\u307e\u3044\u307e\u3059\u3002OpenCSV\u306eexample\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u306f\u4ee5\u4e0a\u3067\u3059\u3002\u53c2\u8003\uff1aOpenCSV\u516c\u5f0f\u30da\u30fc\u30b8\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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