{"id":32388,"date":"2025-10-21T05:41:14","date_gmt":"2025-10-21T02:41:14","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/?p=32388"},"modified":"2025-10-21T05:41:14","modified_gmt":"2025-10-21T02:41:14","slug":"opencsv-csvreader-csvwriter-ornekleri-ile-kapsamli-csv-isleme-rehberi","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/opencsv-csvreader-csvwriter-ornekleri-ile-kapsamli-csv-isleme-rehberi\/","title":{"rendered":"OpenCSV CSVReader CSVWriter \u00d6rnekleri ile Kapsaml\u0131 CSV \u0130\u015fleme Rehberi"},"content":{"rendered":"

<\/p>\n

OpenCSV CSVReader CSVWriter \u00d6rnekleri ile Kapsaml\u0131 CSV \u0130\u015fleme Rehberi<\/h2>\n

Giri\u015f: CSV Dosyalar\u0131 ve Veri Y\u00f6netimindeki Rol\u00fc<\/h3>\n

Veri, modern yaz\u0131l\u0131m uygulamalar\u0131n\u0131n ve i\u015f s\u00fcre\u00e7lerinin temelini olu\u015fturur. Farkl\u0131 sistemler aras\u0131nda veri al\u0131\u015fveri\u015fi yaparken veya b\u00fcy\u00fck veri k\u00fcmelerini depolarken, verinin standart ve okunabilir bir formatta olmas\u0131 b\u00fcy\u00fck \u00f6nem ta\u015f\u0131r. Bu ba\u011flamda, “Comma Separated Values” (CSV) dosyalar\u0131, basitli\u011fi, evrenselli\u011fi ve insan taraf\u0131ndan okunabilirli\u011fi sayesinde en yayg\u0131n kullan\u0131lan veri formatlar\u0131ndan biri haline gelmi\u015ftir.<\/p>\n

CSV dosyalar\u0131, d\u00fcz metin dosyalar\u0131d\u0131r ve her sat\u0131r bir veri kayd\u0131n\u0131 temsil ederken, her kay\u0131ttaki alanlar belirli bir ay\u0131r\u0131c\u0131 (genellikle virg\u00fcl, noktal\u0131 virg\u00fcl veya tab) ile ayr\u0131l\u0131r. \u00d6rne\u011fin, bir m\u00fc\u015fteri listesi, her sat\u0131rda bir m\u00fc\u015fteri bilgisi (Ad, Soyad, E-posta, Telefon) ve bu bilgilerin virg\u00fclle ayr\u0131lmas\u0131 \u015feklinde bir CSV dosyas\u0131nda saklanabilir. Bu basit yap\u0131, CSV’yi elektronik tablolar, veritabanlar\u0131 ve \u00e7e\u015fitli yaz\u0131l\u0131m uygulamalar\u0131 aras\u0131nda veri aktar\u0131m\u0131 i\u00e7in ideal bir se\u00e7im yapar.<\/p>\n

Ancak, CSV dosyalar\u0131 basit g\u00f6r\u00fcnse de, onlar\u0131 programatik olarak do\u011fru bir \u015fekilde ayr\u0131\u015ft\u0131rmak (parsing) veya olu\u015fturmak beklenenden daha karma\u015f\u0131k olabilir. \u00d6zel karakterler (t\u0131rnak i\u015faretleri, ay\u0131r\u0131c\u0131 karakterler), farkl\u0131 karakter kodlamalar\u0131 (UTF-8, ISO-8859-1), bo\u015fluklar ve bo\u015f alanlar gibi detaylar, manuel olarak yaz\u0131lan bir ayr\u0131\u015ft\u0131r\u0131c\u0131n\u0131n hatalara yol a\u00e7mas\u0131na neden olabilir. \u0130\u015fte bu noktada OpenCSV gibi g\u00fc\u00e7l\u00fc ve esnek k\u00fct\u00fcphaneler devreye girer.<\/p>\n

OpenCSV K\u00fct\u00fcphanesine Genel Bak\u0131\u015f<\/h3>\n

OpenCSV, Java ortam\u0131nda CSV dosyalar\u0131n\u0131 okuma ve yazma i\u015flemlerini kolayla\u015ft\u0131ran a\u00e7\u0131k kaynakl\u0131 bir k\u00fct\u00fcphanedir. CSV spesifikasyonunun \u00e7e\u015fitli n\u00fcanslar\u0131n\u0131 (\u00f6rne\u011fin, t\u0131rnak i\u015faretleri i\u00e7indeki virg\u00fcller, ka\u00e7\u0131\u015f karakterleri) ele alarak geli\u015ftiricilerin bu karma\u015f\u0131k detaylarla u\u011fra\u015fmak yerine do\u011frudan veri i\u015fleme mant\u0131\u011f\u0131na odaklanmas\u0131n\u0131 sa\u011flar.<\/p>\n

OpenCSV’nin ba\u015fl\u0131ca avantajlar\u0131 \u015funlard\u0131r:<\/p>\n

* Basit API:<\/strong> Sezgisel ve kullan\u0131m\u0131 kolay bir API sunar.
\n* Esneklik:<\/strong> \u00d6zel ay\u0131r\u0131c\u0131lar, t\u0131rnak karakterleri, ka\u00e7\u0131\u015f karakterleri gibi bir\u00e7ok konfig\u00fcrasyon se\u00e7ene\u011fi sunar.
\n* G\u00fcvenilirlik:<\/strong> CSV spesifikasyonunun bir\u00e7ok kenar durumunu (edge case) do\u011fru bir \u015fekilde ele al\u0131r.
\n* Nesne Haritalama:<\/strong> CSV verilerini do\u011frudan Java nesnelerine d\u00f6n\u00fc\u015ft\u00fcrme ve Java nesnelerinden CSV’ye yazma yetene\u011fi sayesinde geli\u015ftirme s\u00fcrecini h\u0131zland\u0131r\u0131r ve kodun okunabilirli\u011fini art\u0131r\u0131r.
\n* Aktif Geli\u015ftirme:<\/strong> S\u00fcrekli olarak g\u00fcncellenen ve topluluk taraf\u0131ndan desteklenen bir k\u00fct\u00fcphanedir.<\/p>\n

Manuel olarak bir CSV ayr\u0131\u015ft\u0131r\u0131c\u0131s\u0131 yazmak, \u00f6zellikle t\u0131rnak i\u015faretleri i\u00e7inde virg\u00fcl bulunmas\u0131, yeni sat\u0131r karakterleri veya \u00f6zel ka\u00e7\u0131\u015f dizileri gibi durumlar s\u00f6z konusu oldu\u011funda olduk\u00e7a hataya a\u00e7\u0131k ve zaman al\u0131c\u0131 bir s\u00fcre\u00e7tir. OpenCSV, bu karma\u015f\u0131kl\u0131\u011f\u0131 soyutlayarak geli\u015ftiricilere sa\u011flam ve test edilmi\u015f bir \u00e7\u00f6z\u00fcm sunar.<\/p>\n

Kurulum: Maven ve Gradle<\/h4>\n

OpenCSV’yi projenize dahil etmek olduk\u00e7a basittir. Projenizin ba\u011f\u0131ml\u0131l\u0131k y\u00f6netimi arac\u0131na (Maven veya Gradle) ilgili ba\u011f\u0131ml\u0131l\u0131\u011f\u0131 eklemeniz yeterlidir.<\/p>\n

Maven Kullan\u0131yorsan\u0131z (pom.xml):<\/strong><\/p>\n

\n    com.opencsv<\/groupId>\n    opencsv<\/artifactId>\n    5.9<\/version> \n<\/dependency><\/code><\/pre>\n
Gradle Kullan\u0131yorsan\u0131z (build.gradle):<\/strong><\/p>\n
implementation 'com.opencsv:opencsv:5.9' \/\/ En g\u00fcncel s\u00fcr\u00fcm\u00fc kontrol edin<\/code><\/pre>\n
Bu ba\u011f\u0131ml\u0131l\u0131\u011f\u0131 ekledikten sonra, OpenCSV s\u0131n\u0131flar\u0131n\u0131 projenizde kullanmaya ba\u015flayabilirsiniz.<\/p>\n
CSVReader ile CSV Dosyalar\u0131n\u0131 Okuma<\/h3>\n
OpenCSV’nin CSVReader<\/code> s\u0131n\u0131f\u0131, CSV dosyalar\u0131ndan veri okumak i\u00e7in temel bile\u015fendir. Bu s\u0131n\u0131f, CSV dosyas\u0131n\u0131 sat\u0131r sat\u0131r veya tek seferde okuyabilir, ayr\u0131ca \u00e7e\u015fitli konfig\u00fcrasyon se\u00e7enekleriyle esnek okuma imkanlar\u0131 sunar.<\/p>\n
Temel CSV Okuma \u0130\u015flemleri<\/h4>\n
CSVReader<\/code>, bir Reader<\/code> nesnesi (\u00f6rne\u011fin, FileReader<\/code>) al\u0131r ve CSV verilerini ayr\u0131\u015ft\u0131rmak i\u00e7in kullan\u0131l\u0131r. En basit kullan\u0131m senaryosunda, dosyadaki her sat\u0131r\u0131 bir String dizisi (String[]<\/code>) olarak okuyabiliriz.<\/p>\n
\u00d6ncelikle, okuyaca\u011f\u0131m\u0131z bir CSV dosyas\u0131 olu\u015ftural\u0131m. veri.csv<\/code> ad\u0131nda bir dosya ve i\u00e7eri\u011fi \u015f\u00f6yle olsun:<\/p>\n
Ad,Soyad,Ya\u015f,\u015eehir\nAli,Can,30,Ankara\nAy\u015fe,Y\u0131lmaz,25,\u0130stanbul\nMehmet,Demir,40,\u0130zmir\n\"Fatma,G\u00fcl\",35,Bursa<\/code><\/pre>\n
Yukar\u0131daki \u00f6rnekte “Fatma,G\u00fcl” ismindeki virg\u00fcl\u00fcn t\u0131rnak i\u015faretleri i\u00e7ine al\u0131nd\u0131\u011f\u0131na dikkat edin. OpenCSV bunu otomatik olarak tek bir alan olarak alg\u0131layacakt\u0131r.<\/p>\n
1. Sat\u0131r Sat\u0131r Okuma (Line by Line):<\/strong><\/p>\n
Bu y\u00f6ntem, \u00f6zellikle b\u00fcy\u00fck CSV dosyalar\u0131n\u0131 i\u015flerken bellek verimlili\u011fi a\u00e7\u0131s\u0131ndan tercih edilir. Her readNext()<\/code> \u00e7a\u011fr\u0131s\u0131 bir sonraki CSV sat\u0131r\u0131n\u0131 String[]<\/code> olarak d\u00f6nd\u00fcr\u00fcr.<\/p>\n
import com.opencsv.CSVReader;\nimport com.opencsv.exceptions.CsvValidationException;\n\nimport java.io.FileReader;\nimport java.io.IOException;\nimport java.util.Arrays;\n\npublic class CsvReaderTemelOrnek {\n\n    public static void main(String[] args) {\n        String dosyaYolu = \"veri.csv\";\n\n        try (CSVReader reader = new CSVReader(new FileReader(dosyaYolu))) {\n            String[] nextLine;\n            int satirSayisi = 0;\n\n            \/\/ \u0130lk sat\u0131r\u0131 (ba\u015fl\u0131k) oku ve atla\n            reader.readNext(); \/\/ Veya isterseniz ba\u015fl\u0131k sat\u0131r\u0131n\u0131 i\u015fleyebilirsiniz.\n            satirSayisi++;\n\n            while ((nextLine = reader.readNext()) != null) {\n                System.out.println(\"Sat\u0131r \" + (satirSayisi + 1) + \": \" + Arrays.toString(nextLine));\n                satirSayisi++;\n            }\n            System.out.println(\"Toplam \" + (satirSayisi) + \" sat\u0131r okundu.\");\n\n        } catch (IOException | CsvValidationException e) {\n            System.err.println(\"CSV okuma hatas\u0131: \" + e.getMessage());\n            e.printStackTrace();\n        }\n    }\n}<\/code><\/pre>\n
\u00c7\u0131kt\u0131:<\/strong><\/p>\n
Sat\u0131r 2: [Ali, Can, 30, Ankara]\nSat\u0131r 3: [Ay\u015fe, Y\u0131lmaz, 25, \u0130stanbul]\nSat\u0131r 4: [Mehmet, Demir, 40, \u0130zmir]\nSat\u0131r 5: [Fatma,G\u00fcl, 35, Bursa]\nToplam 5 sat\u0131r okundu.<\/code><\/pre>\n
try-with-resources<\/code> yap\u0131s\u0131, CSVReader<\/code> ve FileReader<\/code> kaynaklar\u0131n\u0131n otomatik olarak kapat\u0131lmas\u0131n\u0131 sa\u011flayarak olas\u0131 kaynak s\u0131z\u0131nt\u0131lar\u0131n\u0131 \u00f6nler. CsvValidationException<\/code>, CSV verilerinde ayr\u0131\u015ft\u0131rma kurallar\u0131na uymayan bir durum oldu\u011funda f\u0131rlat\u0131l\u0131r.<\/p>\n
2. T\u00fcm Sat\u0131rlar\u0131 Bir Kerede Okuma:<\/strong><\/p>\n
Daha k\u00fc\u00e7\u00fck CSV dosyalar\u0131 i\u00e7in t\u00fcm veriyi belle\u011fe y\u00fcklemek pratik olabilir. readAll()<\/code> metodu, dosyadaki t\u00fcm sat\u0131rlar\u0131 List<\/code> olarak d\u00f6nd\u00fcr\u00fcr.<\/p>\n
import com.opencsv.CSVReader;\nimport com.opencsv.exceptions.CsvException; \/\/ CsvValidationException'\u0131n s\u00fcper s\u0131n\u0131f\u0131\n\nimport java.io.FileReader;\nimport java.io.IOException;\nimport java.util.List;\nimport java.util.Arrays;\n\npublic class CsvReaderReadAllOrnek {\n\n    public static void main(String[] args) {\n        String dosyaYolu = \"veri.csv\";\n\n        try (CSVReader reader = new CSVReader(new FileReader(dosyaYolu))) {\n            List tumVeri = reader.readAll();\n\n            \/\/ \u0130lk sat\u0131r genellikle ba\u015fl\u0131k oldu\u011fu i\u00e7in onu ayr\u0131 i\u015fleyebiliriz.\n            if (!tumVeri.isEmpty()) {\n                String[] baslik = tumVeri.get(0);\n                System.out.println(\"Ba\u015fl\u0131k: \" + Arrays.toString(baslik));\n\n                for (int i = 1; i < tumVeri.size(); i++) { \/\/ Ba\u015fl\u0131ktan sonraki sat\u0131rlar\u0131 i\u015fle\n                    System.out.println(\"Veri Sat\u0131r\u0131 \" + i + \": \" + Arrays.toString(tumVeri.get(i)));\n                }\n            }\n            System.out.println(\"Toplam \" + tumVeri.size() + \" sat\u0131r okundu.\");\n\n        } catch (IOException | CsvException e) {\n            System.err.println(\"CSV okuma hatas\u0131: \" + e.getMessage());\n            e.printStackTrace();\n        }\n    }\n}<\/code><\/pre>\n
\u00c7\u0131kt\u0131:<\/strong><\/p>\n
Ba\u015fl\u0131k: [Ad, Soyad, Ya\u015f, \u015eehir]\nVeri Sat\u0131r\u0131 1: [Ali, Can, 30, Ankara]\nVeri Sat\u0131r\u0131 2: [Ay\u015fe, Y\u0131lmaz, 25, \u0130stanbul]\nVeri Sat\u0131r\u0131 3: [Mehmet, Demir, 40, \u0130zmir]\nVeri Sat\u0131r\u0131 4: [Fatma,G\u00fcl, 35, Bursa]\nToplam 5 sat\u0131r okundu.<\/code><\/pre>\n
Geli\u015fmi\u015f CSV Okuma Konfig\u00fcrasyonlar\u0131<\/h4>\n
OpenCSV, CSVReaderBuilder<\/code> s\u0131n\u0131f\u0131 arac\u0131l\u0131\u011f\u0131yla CSV okuma i\u015flemini daha da \u00f6zelle\u015ftirmenize olanak tan\u0131r. Bu, standart virg\u00fcl ay\u0131r\u0131c\u0131l\u0131 CSV'lerden farkl\u0131 formatlara sahip dosyalar\u0131 i\u015flerken \u00e7ok kullan\u0131\u015fl\u0131d\u0131r.<\/p>\n
1. \u00d6zel Ay\u0131r\u0131c\u0131 (Delimiter) Kullan\u0131m\u0131:<\/strong><\/p>\n
Baz\u0131 CSV benzeri dosyalar virg\u00fcl yerine noktal\u0131 virg\u00fcl, tab veya ba\u015fka bir karakter kullanabilir. withSeparator()<\/code> metodu ile bu ay\u0131r\u0131c\u0131y\u0131 belirleyebilirsiniz.<\/p>\n
\u00d6rne\u011fin, veri_noktali_virgul.csv<\/code> dosyas\u0131:<\/p>\n
Ad;Soyad;Ya\u015f;\u015eehir\nAli;Can;30;Ankara\nAy\u015fe;Y\u0131lmaz;25;\u0130stanbul<\/code><\/pre>\n
import com.opencsv.CSVReader;\nimport com.opencsv.CSVReaderBuilder;\nimport com.opencsv.exceptions.CsvValidationException;\n\nimport java.io.FileReader;\nimport java.io.IOException;\nimport java.util.Arrays;\n\npublic class CsvReaderOzelAyiriciOrnek {\n\n    public static void main(String[] args) {\n        String dosyaYolu = \"veri_noktali_virgul.csv\";\n\n        try (CSVReader reader = new CSVReaderBuilder(new FileReader(dosyaYolu))\n                .withSeparator(';') \/\/ Noktal\u0131 virg\u00fcl ay\u0131r\u0131c\u0131 kullan\n                .build()) {\n\n            String[] nextLine;\n            while ((nextLine = reader.readNext()) != null) {\n                System.out.println(Arrays.toString(nextLine));\n            }\n\n        } catch (IOException | CsvValidationException e) {\n            System.err.println(\"CSV okuma hatas\u0131: \" + e.getMessage());\n            e.printStackTrace();\n        }\n    }\n}<\/code><\/pre>\n
2. \u00d6zel T\u0131rnak (Quote) Karakteri Kullan\u0131m\u0131:<\/strong><\/p>\n
Varsay\u0131lan olarak, OpenCSV \u00e7ift t\u0131rnak (\") karakterini t\u0131rnak karakteri olarak kabul eder. Baz\u0131 durumlarda tek t\u0131rnak (') veya ba\u015fka bir karakter kullan\u0131labilir. withQuoteChar()<\/code> metodu ile bu ayar\u0131 yapabilirsiniz.<\/p>\n
\/\/ ... (\u0130lgili importlar)\nimport com.opencsv.CSVReaderBuilder;\n\npublic class CsvReaderOzelTirnakOrnek {\n\n    public static void main(String[] args) {\n        String dosyaYolu = \"veri_tek_tirnak.csv\"; \/\/ \u00d6rn: 'Ad','Soyad'\n        \/\/ veri_tek_tirnak.csv i\u00e7eri\u011fi: 'Ad','Soyad','Ya\u015f' \\n 'Ali','Can',30\n\n        try (CSVReader reader = new CSVReaderBuilder(new FileReader(dosyaYolu))\n                .withQuoteChar('\\'') \/\/ Tek t\u0131rnak karakteri kullan\n                .build()) {\n\n            String[] nextLine;\n            while ((nextLine = reader.readNext()) != null) {\n                System.out.println(Arrays.toString(nextLine));\n            }\n\n        } catch (IOException | CsvValidationException e) {\n            System.err.println(\"CSV okuma hatas\u0131: \" + e.getMessage());\n            e.printStackTrace();\n        }\n    }\n}<\/code><\/pre>\n
3. Ba\u015fl\u0131k Sat\u0131r\u0131n\u0131 Atlama (Skipping Lines):<\/strong><\/p>\n
\u00c7o\u011fu CSV dosyas\u0131n\u0131n ilk sat\u0131r\u0131 ba\u015fl\u0131k bilgilerini i\u00e7erir ve bu sat\u0131r\u0131 veri olarak i\u015flemek istemeyebilirsiniz. withSkipLines()<\/code> metodu ile belirli say\u0131da sat\u0131r\u0131 atlayabilirsiniz.<\/p>\n
\/\/ ... (\u0130lgili importlar)\nimport com.opencsv.CSVReaderBuilder;\n\npublic class CsvReaderBaslikAtlaOrnek {\n\n    public static void main(String[] args) {\n        String dosyaYolu = \"veri.csv\"; \/\/ Ba\u015fl\u0131k i\u00e7eren dosya\n\n        try (CSVReader reader = new CSVReaderBuilder(new FileReader(dosyaYolu))\n                .withSkipLines(1) \/\/ \u0130lk sat\u0131r\u0131 atla (ba\u015fl\u0131k)\n                .build()) {\n\n            String[] nextLine;\n            while ((nextLine = reader.readNext()) != null) {\n                System.out.println(Arrays.toString(nextLine));\n            }\n\n        } catch (IOException | CsvValidationException e) {\n            System.err.println(\"CSV okuma hatas\u0131: \" + e.getMessage());\n            e.printStackTrace();\n        }\n    }\n}<\/code><\/pre>\n
\u00c7\u0131kt\u0131 (Ba\u015fl\u0131k hari\u00e7):<\/strong><\/p>\n
[Ali, Can, 30, Ankara]\n[Ay\u015fe, Y\u0131lmaz, 25, \u0130stanbul]\n[Mehmet, Demir, 40, \u0130zmir]\n[Fatma,G\u00fcl, 35, Bursa]<\/code><\/pre>\n
CSVReaderBuilder<\/code>, bu ve benzeri bir\u00e7ok konfig\u00fcrasyon se\u00e7ene\u011fini (\u00f6rne\u011fin, withEscapeChar()<\/code>, withStrictQuotes()<\/code>) birle\u015ftirerek karma\u015f\u0131k CSV formatlar\u0131n\u0131 bile kolayca okuman\u0131z\u0131 sa\u011flar.<\/p>\n
Hata Y\u00f6netimi ve Kaynak Kapatma<\/h4>\n
CSV okuma i\u015flemleri s\u0131ras\u0131nda IOException<\/code> (dosya bulunamad\u0131, okuma izni yok vb.) veya CsvValidationException<\/code> (CSV format\u0131 kurallar\u0131na uymayan veri) gibi hatalar meydana gelebilir. Bu hatalar\u0131 yakalamak ve uygun \u015fekilde i\u015flemek uygulaman\u0131z\u0131n sa\u011flaml\u0131\u011f\u0131 i\u00e7in kritik \u00f6neme sahiptir.<\/p>\n
Yukar\u0131daki \u00f6rneklerde g\u00f6sterildi\u011fi gibi, try-with-resources<\/code> yap\u0131s\u0131 CSVReader<\/code> ve FileReader<\/code> gibi kaynaklar\u0131n i\u015fleri bitti\u011finde veya bir hata olu\u015ftu\u011funda otomatik olarak kapat\u0131lmas\u0131n\u0131 garanti eder. Bu, kaynak s\u0131z\u0131nt\u0131lar\u0131n\u0131 \u00f6nlemenin en iyi yoludur.<\/p>\n
try (CSVReader reader = new CSVReader(new FileReader(dosyaYolu))) {\n    \/\/ Okuma i\u015flemleri\n} catch (IOException e) {\n    System.err.println(\"Dosya eri\u015fim hatas\u0131: \" + e.getMessage());\n} catch (CsvValidationException e) {\n    System.err.println(\"CSV veri do\u011frulama hatas\u0131: \" + e.getMessage());\n}<\/code><\/pre>\n
CSVWriter ile CSV Dosyalar\u0131na Yazma<\/h3>\n
CSVWriter<\/code> s\u0131n\u0131f\u0131, OpenCSV'nin CSV dosyalar\u0131na veri yazma bile\u015fenidir. CSVReader<\/code> gibi, CSVWriter<\/code> da \u00e7e\u015fitli konfig\u00fcrasyon se\u00e7enekleriyle esnek yazma yetenekleri sunar.<\/p>\n
Temel CSV Yazma \u0130\u015flemleri<\/h4>\n
CSVWriter<\/code>, bir Writer<\/code> nesnesi (\u00f6rne\u011fin, FileWriter<\/code>) al\u0131r ve String[]<\/code> format\u0131ndaki verileri CSV dosyas\u0131na yazar.<\/p>\n
1. Sat\u0131r Sat\u0131r Yazma (Line by Line):<\/strong><\/p>\n
writeNext()<\/code> metodu, tek bir String[]<\/code> dizisini CSV format\u0131nda bir sat\u0131r olarak dosyaya yazar.<\/p>\n
import com.opencsv.CSVWriter;\n\nimport java.io.FileWriter;\nimport java.io.IOException;\n\npublic class CsvWriterTemelOrnek {\n\n    public static void main(String[] args) {\n        String dosyaYolu = \"yeni_veri.csv\";\n\n        String[] baslik = {\"Ad\", \"Soyad\", \"Ya\u015f\", \"\u015eehir\"};\n        String[] veri1 = {\"Can\", \"Y\u0131lmaz\", \"28\", \"\u0130stanbul\"};\n        String[] veri2 = {\"Zeynep\", \"Kara\", \"32\", \"Ankara\"};\n        String[] veri3 = {\"Ahmet\", \"Ak\", \"45\", \"\u0130zmir\"};\n        String[] veri4 = {\"\"Merhaba, D\u00fcnya\"\", \"\u00d6zel\", \"10\", \"Gezegen\"}; \/\/ Virg\u00fcl i\u00e7eren veri\n\n        try (CSVWriter writer = new CSVWriter(new FileWriter(dosyaYolu))) {\n            writer.writeNext(baslik);\n            writer.writeNext(veri1);\n            writer.writeNext(veri2);\n            writer.writeNext(veri3);\n            writer.writeNext(veri4);\n\n            System.out.println(dosyaYolu + \" dosyas\u0131na veri ba\u015far\u0131yla yaz\u0131ld\u0131.\");\n\n        } catch (IOException e) {\n            System.err.println(\"CSV yazma hatas\u0131: \" + e.getMessage());\n            e.printStackTrace();\n        }\n    }\n}<\/code><\/pre>\n
yeni_veri.csv<\/code> i\u00e7eri\u011fi:<\/strong><\/p>\n
Ad,Soyad,Ya\u015f,\u015eehir\nCan,Y\u0131lmaz,28,\u0130stanbul\nZeynep,Kara,32,Ankara\nAhmet,Ak,45,\u0130zmir\n\"\"\"Merhaba, D\u00fcnya\"\"\",\u00d6zel,10,Gezegen<\/code><\/pre>\n
Dikkat edin: \"Merhaba, D\u00fcnya\"<\/code> ifadesi OpenCSV taraf\u0131ndan otomatik olarak \"\"\"Merhaba, D\u00fcnya\"\"\"<\/code> \u015feklinde yaz\u0131ld\u0131. \u0130lk ve son t\u0131rnaklar alan\u0131n t\u0131rnak i\u00e7ine al\u0131nd\u0131\u011f\u0131n\u0131 belirtirken, i\u00e7indeki t\u0131rnaklar ka\u00e7\u0131\u015f karakteri olarak \u00e7ift t\u0131rnakla temsil edildi. Bu, CSV standartlar\u0131na uygun bir davran\u0131\u015ft\u0131r.<\/p>\n
2. T\u00fcm Sat\u0131rlar\u0131 Bir Kerede Yazma:<\/strong><\/p>\n
writeAll()<\/code> metodu, List<\/code> tipindeki t\u00fcm verileri tek seferde dosyaya yazar. Bu, \u00f6zellikle bellekte zaten haz\u0131r olan k\u00fc\u00e7\u00fck veri k\u00fcmeleri i\u00e7in kullan\u0131\u015fl\u0131d\u0131r.<\/p>\n
import com.opencsv.CSVWriter;\n\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.util.ArrayList;\nimport java.util.List;\n\npublic class CsvWriterReadAllOrnek {\n\n    public static void main(String[] args) {\n        String dosyaYolu = \"tum_yeni_veri.csv\";\n\n        List veriListesi = new ArrayList<>();\n        veriListesi.add(new String[]{\"\u00dcr\u00fcn Kodu\", \"\u00dcr\u00fcn Ad\u0131\", \"Fiyat\", \"Stok\"});\n        veriListesi.add(new String[]{\"P001\", \"Laptop\", \"1200.50\", \"50\"});\n        veriListesi.add(new String[]{\"P002\", \"Mouse\", \"25.99\", \"200\"});\n        veriListesi.add(new String[]{\"P003\", \"Klavye\", \"75.00\", \"150\"});\n\n        try (CSVWriter writer = new CSVWriter(new FileWriter(dosyaYolu))) {\n            writer.writeAll(veriListesi);\n            System.out.println(dosyaYolu + \" dosyas\u0131na t\u00fcm veri ba\u015far\u0131yla yaz\u0131ld\u0131.\");\n\n        } catch (IOException e) {\n            System.err.println(\"CSV yazma hatas\u0131: \" + e.getMessage());\n            e.printStackTrace();\n        }\n    }\n}<\/code><\/pre>\n
Geli\u015fmi\u015f CSV Yazma Konfig\u00fcrasyonlar\u0131<\/h4>\n
CSVWriterBuilder<\/code> s\u0131n\u0131f\u0131, CSVWriter<\/code>'\u0131n davran\u0131\u015f\u0131n\u0131 \u00f6zelle\u015ftirmek i\u00e7in kullan\u0131l\u0131r.<\/p>\n
1. \u00d6zel Ay\u0131r\u0131c\u0131, T\u0131rnak ve Ka\u00e7\u0131\u015f Karakterleri Kullan\u0131m\u0131:<\/strong><\/p>\n
CSVWriterBuilder<\/code> ile ay\u0131r\u0131c\u0131, t\u0131rnak karakteri ve ka\u00e7\u0131\u015f karakterini belirleyebilirsiniz. Bu, belirli bir formatta CSV dosyas\u0131 olu\u015fturman\u0131z gerekti\u011finde faydal\u0131d\u0131r.<\/p>\n
import com.opencsv.CSVWriter;\nimport com.opencsv.CSVWriterBuilder;\nimport com.opencsv.ICSVWriter; \/\/ Sabitleri i\u00e7erir\n\nimport java.io.FileWriter;\nimport java.io.IOException;\n\npublic class CsvWriterOzelKonfigurasyonOrnek {\n\n    public static void main(String[] args) {\n        String dosyaYolu = \"ozel_format_veri.csv\";\n\n        String[] baslik = {\"ID\", \"A\u00e7\u0131klama\", \"De\u011fer\"};\n        String[] veri1 = {\"1\", \"Bu bir a\u00e7\u0131klama; noktal\u0131 virg\u00fcl i\u00e7erir\", \"100\"};\n        String[] veri2 = {\"2\", \"Ba\u015fka bir a\u00e7\u0131klama\", \"200\"};\n\n        try (CSVWriter writer = new CSVWriterBuilder(new FileWriter(dosyaYolu))\n                .withSeparator(';') \/\/ Noktal\u0131 virg\u00fcl ay\u0131r\u0131c\u0131\n                .withQuoteChar('\\'') \/\/ Tek t\u0131rnak karakteri\n                .withEscapeChar('\\\\') \/\/ Ters e\u011fik \u00e7izgi ka\u00e7\u0131\u015f karakteri\n                .withLineEnd(ICSVWriter.RFC4180_LINE_END) \/\/ Sat\u0131r sonu karakteri (varsay\u0131lan)\n                .build()) {\n\n            writer.writeNext(baslik);\n            writer.writeNext(veri1);\n            writer.writeNext(veri2);\n\n            System.out.println(dosyaYolu + \" dosyas\u0131na \u00f6zel formatta veri yaz\u0131ld\u0131.\");\n\n        } catch (IOException e) {\n            System.err.println(\"CSV yazma hatas\u0131: \" + e.getMessage());\n            e.printStackTrace();\n        }\n    }\n}<\/code><\/pre>\n
ozel_format_veri.csv<\/code> i\u00e7eri\u011fi:<\/strong><\/p>\n
'ID';'A\u00e7\u0131klama';'De\u011fer'\n'1';'Bu bir a\u00e7\u0131klama\\; noktal\u0131 virg\u00fcl i\u00e7erir';'100'\n'2';'Ba\u015fka bir a\u00e7\u0131klama';'200'<\/code><\/pre>\n
Yukar\u0131daki \u00f6rnekte, noktal\u0131 virg\u00fcl i\u00e7eren alan otomatik olarak tek t\u0131rnak i\u00e7ine al\u0131nm\u0131\u015f ve i\u00e7indeki noktal\u0131 virg\u00fcl ka\u00e7\u0131\u015f karakteriyle (\\<\/code>) belirtilmi\u015ftir.<\/p>\n
2. Mevcut Dosyaya Ekleme (Appending):<\/strong><\/p>\n
Mevcut bir CSV dosyas\u0131na yeni sat\u0131rlar eklemek isterseniz, FileWriter<\/code>'\u0131 true<\/code> parametresiyle (append modu) olu\u015fturman\u0131z ve CSVWriter<\/code>'a vermeniz yeterlidir.<\/p>\n
import com.opencsv.CSVWriter;\n\nimport java.io.FileWriter;\nimport java.io.IOException;\n\npublic class CsvWriterAppendOrnek {\n\n    public static void main(String[] args) {\n        String dosyaYolu = \"mevcut_veri.csv\"; \/\/ Bu dosyan\u0131n \u00f6nceden var oldu\u011funu varsayal\u0131m\n\n        \/\/ \u0130lk \u00e7al\u0131\u015ft\u0131rmada bir dosya olu\u015ftural\u0131m (e\u011fer yoksa)\n        try (CSVWriter writer = new CSVWriter(new FileWriter(dosyaYolu))) {\n            writer.writeNext(new String[]{\"\u00dcr\u00fcn\", \"Miktar\"});\n            writer.writeNext(new String[]{\"Elma\", \"100\"});\n        } catch (IOException e) { \/ Hata y\u00f6netimi <\/em>\/ }\n\n        \/\/ \u015eimdi mevcut dosyaya ekleyelim\n        String[] yeniVeri1 = {\"Armut\", \"50\"};\n        String[] yeniVeri2 = {\"Muz\", \"75\"};\n\n        try (CSVWriter writer = new CSVWriter(new FileWriter(dosyaYolu, true))) { \/\/ true = append modu\n            writer.writeNext(yeniVeri1);\n            writer.writeNext(yeniVeri2);\n            System.out.println(dosyaYolu + \" dosyas\u0131na yeni veriler eklendi.\");\n        } catch (IOException e) {\n            System.err.println(\"CSV ekleme hatas\u0131: \" + e.getMessage());\n            e.printStackTrace();\n        }\n    }\n}<\/code><\/pre>\n
mevcut_veri.csv<\/code> i\u00e7eri\u011fi (ekleme sonras\u0131):<\/strong><\/p>\n
\u00dcr\u00fcn,Miktar\nElma,100\nArmut,50\nMuz,75<\/code><\/pre>\n
Hata Y\u00f6netimi ve Kaynak Kapatma<\/h4>\n
Yazma i\u015flemlerinde de IOException<\/code> hatalar\u0131 meydana gelebilir (disk dolu, yazma izni yok vb.). try-with-resources<\/code> yine en iyi pratik olup, CSVWriter<\/code> ve FileWriter<\/code> kaynaklar\u0131n\u0131n otomatik olarak kapat\u0131lmas\u0131n\u0131 sa\u011flar. Ayr\u0131ca, writer.flush()<\/code> metodunu \u00e7a\u011f\u0131rarak tamponlanan verilerin dosyaya yaz\u0131ld\u0131\u011f\u0131ndan emin olabilirsiniz, ancak try-with-resources<\/code> bunu otomatik olarak halleder.<\/p>\n
try (CSVWriter writer = new CSVWriter(new FileWriter(dosyaYolu))) {\n    \/\/ Yazma i\u015flemleri\n} catch (IOException e) {\n    System.err.println(\"Dosya yazma hatas\u0131: \" + e.getMessage());\n}<\/code><\/pre>\n
Nesne Haritalama (Object Mapping) ile Daha Kolay CSV \u0130\u015flemleri<\/h3>\n
OpenCSV'nin en g\u00fc\u00e7l\u00fc \u00f6zelliklerinden biri, CSV verilerini do\u011frudan Java nesnelerine d\u00f6n\u00fc\u015ft\u00fcrme (okuma) ve Java nesnelerini CSV format\u0131na d\u00f6n\u00fc\u015ft\u00fcrme (yazma) yetene\u011fidir. Bu, kodunuzu daha okunabilir, tip g\u00fcvenli ve s\u00fcrd\u00fcr\u00fclebilir hale getirir. Bu i\u015flem i\u00e7in CsvToBean<\/code>, CsvToBeanBuilder<\/code> ve StatefulBeanToCsv<\/code>, StatefulBeanToCsvBuilder<\/code> s\u0131n\u0131flar\u0131 kullan\u0131l\u0131r.<\/p>\n
\u00d6ncelikle, CSV verilerini temsil edecek basit bir Java s\u0131n\u0131f\u0131 (POJO - Plain Old Java Object) tan\u0131mlayal\u0131m:<\/p>\n
public class Musteri {\n    private String ad;\n    private String soyad;\n    private int yas;\n    private String sehir;\n\n    \/\/ Varsay\u0131lan kurucu metot (OpenCSV i\u00e7in gereklidir)\n    public Musteri() {\n    }\n\n    public Musteri(String ad, String soyad, int yas, String sehir) {\n        this.ad = ad;\n        this.soyad = soyad;\n        this.yas = yas;\n        this.sehir = sehir;\n    }\n\n    \/\/ Getter ve Setter metotlar\u0131\n    public String getAd() { return ad; }\n    public void setAd(String ad) { this.ad = ad; }\n    public String getSoyad() { return soyad; }\n    public void setSoyad(String soyad) { this.soyad = soyad; }\n    public int getYas() { return yas; }\n    public void setYas(int yas) { this.yas = yas; }\n    public String getSehir() { return sehir; }\n    public void setSehir(String sehir) { this.sehir = sehir; }\n\n    @Override\n    public String toString() {\n        return \"Musteri{\" +\n               \"ad='\" + ad + '\\'' +\n               \", soyad='\" + soyad + '\\'' +\n               \", yas=\" + yas +\n               \", sehir='\" + sehir + '\\'' +\n               '}';\n    }\n}<\/code><\/pre>\n
CSVReader ile Java Nesnelerine Okuma<\/h4>\n
CsvToBeanBuilder<\/code> s\u0131n\u0131f\u0131, CSVReader<\/code> ile okunan verileri Musteri<\/code> gibi bir Java nesnesine d\u00f6n\u00fc\u015ft\u00fcrmek i\u00e7in kullan\u0131l\u0131r. \u0130ki ana strateji vard\u0131r:<\/p>\n
1. HeaderColumnNameMappingStrategy<\/code> (Ba\u015fl\u0131k Adlar\u0131na G\u00f6re Haritalama):<\/strong><\/p>\n
Bu strateji, CSV dosyas\u0131n\u0131n ba\u015fl\u0131k sat\u0131r\u0131ndaki s\u00fctun adlar\u0131n\u0131 Java s\u0131n\u0131f\u0131n\u0131n alan adlar\u0131yla e\u015fle\u015ftirir. Bu, en esnek ve okunabilir y\u00f6ntemdir.<\/p>\n
import com.opencsv.bean.CsvToBean;\nimport com.opencsv.bean.CsvToBeanBuilder;\nimport com.opencsv.bean.HeaderColumnNameMappingStrategy;\n\nimport java.io.FileReader;\nimport java.io.IOException;\nimport java.util.List;\n\npublic class CsvToBeanBaslikHaritalamaOrnek {\n\n    public static void main(String[] args) {\n        String dosyaYolu = \"veri.csv\"; \/\/ Ba\u015fl\u0131k sat\u0131r\u0131 i\u00e7eren dosya\n\n        try (FileReader reader = new FileReader(dosyaYolu)) {\n            HeaderColumnNameMappingStrategy strategy = new HeaderColumnNameMappingStrategy<>();\n            strategy.setType(Musteri.class);\n\n            CsvToBean csvToBean = new CsvToBeanBuilder(reader)\n                    .withType(Musteri.class)\n                    .withMappingStrategy(strategy)\n                    .build();\n\n            List musteriler = csvToBean.parse();\n\n            for (Musteri musteri : musteriler) {\n                System.out.println(musteri);\n            }\n\n        } catch (IOException e) {\n            System.err.println(\"CSV okuma hatas\u0131: \" + e.getMessage());\n            e.printStackTrace();\n        }\n    }\n}<\/code><\/pre>\n
\u00c7\u0131kt\u0131:<\/strong><\/p>\n
Musteri{ad='Ali', soyad='Can', yas=30, sehir='Ankara'}\nMusteri{ad='Ay\u015fe', soyad='Y\u0131lmaz', yas=25, sehir='\u0130stanbul'}\nMusteri{ad='Mehmet', soyad='Demir', yas=40, sehir='\u0130zmir'}\nMusteri{ad='Fatma,G\u00fcl', soyad='35', yas=0, sehir='Bursa'} \/\/ Hata: '35' soyad de\u011fil ya\u015f olmal\u0131yd\u0131.<\/code><\/pre>\n
\u00d6nemli Not:<\/strong> Yukar\u0131daki \u00e7\u0131kt\u0131da \"Fatma,G\u00fcl\" sat\u0131r\u0131nda bir hata olu\u015ftu\u011funu fark edeceksiniz. Bunun nedeni, veri.csv<\/code> dosyas\u0131ndaki \"Fatma,G\u00fcl\",35,Bursa\" sat\u0131r\u0131nda \"35\" de\u011ferinin soyad<\/code> alan\u0131na kar\u015f\u0131l\u0131k gelmesi ve yas<\/code> alan\u0131n\u0131n bo\u015f kalmas\u0131d\u0131r. OpenCSV, int<\/code> gibi ilkel tipler i\u00e7in varsay\u0131lan de\u011fer (0) atar. Bu t\u00fcr durumlarda, CsvBindByName<\/code> veya CsvBindByPosition<\/code> gibi anotasyonlar kullanarak haritalamay\u0131 daha hassas hale getirebiliriz.<\/p>\n
Musteri<\/code> s\u0131n\u0131f\u0131n\u0131 anotasyonlarla g\u00fcncelleyelim:<\/p>\n
import com.opencsv.bean.CsvBindByName; \/\/ Ba\u015fl\u0131k ad\u0131na g\u00f6re ba\u011flama\nimport com.opencsv.bean.CsvBindByPosition; \/\/ Pozisyona g\u00f6re ba\u011flama (iste\u011fe ba\u011fl\u0131)\n\npublic class Musteri {\n    @CsvBindByName(column = \"Ad\")\n    private String ad;\n    @CsvBindByName(column = \"Soyad\")\n    private String soyad;\n    @CsvBindByName(column = \"Ya\u015f\")\n    private int yas;\n    @CsvBindByName(column = \"\u015eehir\")\n    private String sehir;\n\n    \/\/ ... (Kurucular, Getter\/Setter, toString metotlar\u0131 ayn\u0131 kal\u0131r)\n}<\/code><\/pre>\n
Anotasyonlar\u0131 ekledikten sonra, CsvToBeanBaslikHaritalamaOrnek<\/code> kodunu tekrar \u00e7al\u0131\u015ft\u0131r\u0131rsak, \u00e7\u0131kt\u0131 do\u011fru olacakt\u0131r:<\/p>\n
Musteri{ad='Ali', soyad='Can', yas=30, sehir='Ankara'}\nMusteri{ad='Ay\u015fe', soyad='Y\u0131lmaz', yas=25, sehir='\u0130stanbul'}\nMusteri{ad='Mehmet', soyad='Demir', yas=40, sehir='\u0130zmir'}\nMusteri{ad='Fatma,G\u00fcl', soyad='35', yas=0, sehir='Bursa'} \/\/ Hata hala var!<\/code><\/pre>\n
Hata hala devam ediyor, \u00e7\u00fcnk\u00fc veri.csv<\/code> dosyas\u0131nda Fatma,G\u00fcl<\/code> alan\u0131 \u00e7ift t\u0131rnak i\u00e7inde oldu\u011fu i\u00e7in OpenCSV bunu tek bir alan olarak alg\u0131l\u0131yor: \"Fatma,G\u00fcl\"<\/code>. Geri kalan 35<\/code> ve Bursa<\/code> ise s\u0131ras\u0131yla soyad<\/code> ve yas<\/code> alanlar\u0131na denk geliyor. Bu durumda yas<\/code> alan\u0131na 35<\/code> de\u011feri atan\u0131rken, sehir<\/code> alan\u0131 Bursa<\/code> oluyor ve soyad<\/code> alan\u0131 bo\u015f kal\u0131yor (veya 35<\/code> de\u011feri string olarak atan\u0131p yas<\/code> 0 oluyor).<\/p>\n
Do\u011fru veri.csv<\/code> sat\u0131r\u0131 \"Fatma,G\u00fcl\" i\u00e7in:<\/strong><\/p>\n
Ad,Soyad,Ya\u015f,\u015eehir\nAli,Can,30,Ankara\nAy\u015fe,Y\u0131lmaz,25,\u0130stanbul\nMehmet,Demir,40,\u0130zmir\n\"Fatma\",\"G\u00fcl\",35,Bursa  \/\/ E\u011fer Fatma ve G\u00fcl ayr\u0131 alanlarsa<\/code><\/pre>\n
Veya e\u011fer \"Fatma,G\u00fcl\" tek bir alan ise ve ya\u015f 35 ise:<\/p>\n
\"Fatma,G\u00fcl\",Bilinmiyor,35,Bursa \/\/ \"Bilinmiyor\" soyad i\u00e7in bir yer tutucu<\/code><\/pre>\n
Basitlik ad\u0131na, veri.csv<\/code> dosyas\u0131n\u0131 \u015fu \u015fekilde g\u00fcncelleyelim ki, HeaderColumnNameMappingStrategy<\/code> do\u011fru \u00e7al\u0131\u015fs\u0131n:<\/p>\n
Ad,Soyad,Ya\u015f,\u015eehir\nAli,Can,30,Ankara\nAy\u015fe,Y\u0131lmaz,25,\u0130stanbul\nMehmet,Demir,40,\u0130zmir\nFatma,G\u00fcl,35,Bursa<\/code><\/pre>\n
Bu durumda \"Fatma,G\u00fcl\" sat\u0131r\u0131 art\u0131k sorun yaratmayacakt\u0131r, \u00e7\u00fcnk\u00fc virg\u00fcl t\u0131rnak i\u00e7inde de\u011fil. E\u011fer ger\u00e7ekten \"Fatma,G\u00fcl\" tek bir isimse, o zaman CSV'de \"Fatma,G\u00fcl\",Soyad,Ya\u015f,\u015eehir<\/code> \u015feklinde yaz\u0131lmas\u0131 ve Musteri<\/code> s\u0131n\u0131f\u0131nda ad<\/code> alan\u0131n\u0131n bu tek de\u011feri almas\u0131 gerekir. Mevcut Musteri<\/code> s\u0131n\u0131f\u0131m\u0131zda ad<\/code> ve soyad<\/code> ayr\u0131 alanlar oldu\u011fu i\u00e7in, bu CSV yap\u0131s\u0131 daha uygun.<\/p>\n
Tekrar \u00e7al\u0131\u015ft\u0131rd\u0131\u011f\u0131m\u0131zda \u00e7\u0131kt\u0131 \u015f\u00f6yle olacakt\u0131r:<\/p>\n
Musteri{ad='Ali', soyad='Can', yas=30, sehir='Ankara'}\nMusteri{ad='Ay\u015fe', soyad='Y\u0131lmaz', yas=25, sehir='\u0130stanbul'}\nMusteri{ad='Mehmet', soyad='Demir', yas=40, sehir='\u0130zmir'}\nMusteri{ad='Fatma', soyad='G\u00fcl', yas=35, sehir='Bursa'}<\/code><\/pre>\n
Bu, beklenen do\u011fru \u00e7\u0131kt\u0131d\u0131r.<\/p>\n
2. ColumnPositionMappingStrategy<\/code> (S\u00fctun Pozisyonuna G\u00f6re Haritalama):<\/strong><\/p>\n
Bu strateji, CSV dosyas\u0131n\u0131n s\u00fctunlar\u0131n\u0131n pozisyonlar\u0131n\u0131 Java s\u0131n\u0131f\u0131n\u0131n alanlar\u0131yla e\u015fle\u015ftirir. CSV dosyas\u0131nda ba\u015fl\u0131k sat\u0131r\u0131 yoksa veya s\u00fctun adlar\u0131 garanti edilmiyorsa kullan\u0131\u015fl\u0131d\u0131r. Anotasyon olarak CsvBindByPosition<\/code> kullan\u0131l\u0131r.<\/p>\n
Musteri<\/code> s\u0131n\u0131f\u0131n\u0131 pozisyonlara g\u00f6re g\u00fcncelleyelim:<\/p>\n
import com.opencsv.bean.CsvBindByPosition;\n\npublic class Musteri {\n    @CsvBindByPosition(position = 0)\n    private String ad;\n    @CsvBindByPosition(position = 1)\n    private String soyad;\n    @CsvBindByPosition(position = 2)\n    private int yas;\n    @CsvBindByPosition(position = 3)\n    private String sehir;\n\n    \/\/ ... (Kurucular, Getter\/Setter, toString metotlar\u0131 ayn\u0131 kal\u0131r)\n}<\/code><\/pre>\n
Okuma kodu:<\/p>\n
import com.opencsv.bean.CsvToBean;\nimport com.opencsv.bean.CsvToBeanBuilder;\nimport com.opencsv.bean.ColumnPositionMappingStrategy;\n\nimport java.io.FileReader;\nimport java.io.IOException;\nimport java.util.List;\n\npublic class CsvToBeanPozisyonHaritalamaOrnek {\n\n    public static void main(String[] args) {\n        String dosyaYolu = \"veri.csv\"; \/\/ Ba\u015fl\u0131k sat\u0131r\u0131 i\u00e7eren dosya\n\n        try (FileReader reader = new FileReader(dosyaYolu)) {\n            ColumnPositionMappingStrategy strategy = new ColumnPositionMappingStrategy<>();\n            strategy.setType(Musteri.class);\n\n            \/\/ E\u011fer ba\u015fl\u0131k sat\u0131r\u0131n\u0131 atlamak istiyorsak, reader'\u0131 ona g\u00f6re yap\u0131land\u0131rmal\u0131y\u0131z.\n            \/\/ Bu \u00f6rnekte, ba\u015fl\u0131k sat\u0131r\u0131n\u0131 atlamadan pozisyonlara g\u00f6re okuyaca\u011f\u0131z,\n            \/\/ bu da ba\u015fl\u0131k sat\u0131r\u0131n\u0131 da Musteri nesnesine d\u00f6n\u00fc\u015ft\u00fcrmeye \u00e7al\u0131\u015faca\u011f\u0131 anlam\u0131na gelir.\n            \/\/ Ger\u00e7ek uygulamalarda ba\u015fl\u0131k sat\u0131r\u0131 atlanmal\u0131d\u0131r.\n            \n            CsvToBean csvToBean = new CsvToBeanBuilder(reader)\n                    .withType(Musteri.class)\n                    .withMappingStrategy(strategy)\n                    .withSkipLines(1) \/\/ Ba\u015fl\u0131k sat\u0131r\u0131n\u0131 atla\n                    .build();\n\n            List musteriler = csvToBean.parse();\n\n            for (Musteri musteri : musteriler) {\n                System.out.println(musteri);\n            }\n\n        } catch (IOException e) {\n            System.err.println(\"CSV okuma hatas\u0131: \" + e.getMessage());\n            e.printStackTrace();\n        }\n    }\n}<\/code><\/pre>\n
\u00c7\u0131kt\u0131 (yine g\u00fcncellenmi\u015f veri.csv<\/code> ile):<\/strong><\/p>\n
Musteri{ad='Ali', soyad='Can', yas=30, sehir='Ankara'}\nMusteri{ad='Ay\u015fe', soyad='Y\u0131lmaz', yas=25, sehir='\u0130stanbul'}\nMusteri{ad='Mehmet', soyad='Demir', yas=40, sehir='\u0130zmir'}\nMusteri{ad='Fatma', soyad='G\u00fcl', yas=35, sehir='Bursa'}<\/code><\/pre>\n
withSkipLines(1)<\/code> kullan\u0131lmas\u0131, ba\u015fl\u0131k sat\u0131r\u0131n\u0131n Musteri<\/code> nesnesine d\u00f6n\u00fc\u015ft\u00fcr\u00fclmeye \u00e7al\u0131\u015f\u0131lmas\u0131n\u0131 engeller ve sadece veri sat\u0131rlar\u0131n\u0131n i\u015flenmesini sa\u011flar.<\/p>\n
CSVWriter ile Java Nesnelerinden Yazma<\/h4>\n
StatefulBeanToCsvBuilder<\/code> s\u0131n\u0131f\u0131, Java nesnelerinin listesini CSV format\u0131na yazmak i\u00e7in kullan\u0131l\u0131r. Bu da Musteri<\/code> s\u0131n\u0131f\u0131m\u0131zdaki anotasyonlar\u0131 kullan\u0131r.<\/p>\n
import com.opencsv.CSVWriter;\nimport com.opencsv.bean.StatefulBeanToCsv;\nimport com.opencsv.bean.StatefulBeanToCsvBuilder;\nimport com.opencsv.bean.HeaderColumnNameMappingStrategy;\nimport com.opencsv.exceptions.CsvDataTypeMismatchException;\nimport com.opencsv.exceptions.CsvRequiredFieldEmptyException;\n\nimport java.io.FileWriter;\nimport java.io.IOException;\nimport java.util.ArrayList;\nimport java.util.List;\n\npublic class BeanToCsvOrnek {\n\n    public static void main(String[] args) {\n        String dosyaYolu = \"musteri_listesi.csv\";\n\n        List musteriler = new ArrayList<>();\n        musteriler.add(new Musteri(\"Elif\", \"Kaya\", 22, \"Antalya\"));\n        musteriler.add(new Musteri(\"Burak\", \"Aslan\", 38, \"Konya\"));\n        musteriler.add(new Musteri(\"Gizem\", \"Deniz\", 29, \"Trabzon\"));\n\n        try (FileWriter writer = new FileWriter(dosyaYolu)) {\n            HeaderColumnNameMappingStrategy strategy = new HeaderColumnNameMappingStrategy<>();\n            strategy.setType(Musteri.class);\n\n            StatefulBeanToCsv beanToCsv = new StatefulBeanToCsvBuilder(writer)\n                    .withMappingStrategy(strategy)\n                    .withSeparator(CSVWriter.DEFAULT_SEPARATOR) \/\/ Varsay\u0131lan virg\u00fcl\n                    .withQuoteChar(CSVWriter.DEFAULT_QUOTE_CHARACTER) \/\/ Varsay\u0131lan \u00e7ift t\u0131rnak\n                    .build();\n\n            beanToCsv.write(musteriler);\n\n            System.out.println(dosyaYolu + \" dosyas\u0131na m\u00fc\u015fteri listesi ba\u015far\u0131yla yaz\u0131ld\u0131.\");\n\n        } catch (IOException | CsvDataTypeMismatchException | CsvRequiredFieldEmptyException e) {\n            System.err.println(\"CSV yazma hatas\u0131: \" + e.getMessage());\n            e.printStackTrace();\n        }\n    }\n}<\/code><\/pre>\n
musteri_listesi.csv<\/code> i\u00e7eri\u011fi:<\/strong><\/p>\n
Ad,Soyad,Ya\u015f,\u015eehir\nElif,Kaya,22,Antalya\nBurak,Aslan,38,Konya\nGizem,Deniz,29,Trabzon<\/code><\/pre>\n
StatefulBeanToCsvBuilder<\/code> varsay\u0131lan olarak ba\u015fl\u0131k sat\u0131r\u0131n\u0131 da yazar. HeaderColumnNameMappingStrategy<\/code> kullan\u0131ld\u0131\u011f\u0131 i\u00e7in, ba\u015fl\u0131klar Musteri<\/code> s\u0131n\u0131f\u0131ndaki @CsvBindByName<\/code> anotasyonlar\u0131nda belirtilen column<\/code> adlar\u0131ndan veya alan adlar\u0131ndan (anotasyon yoksa) al\u0131n\u0131r.<\/p>\n
OpenCSV ile En \u0130yi Uygulamalar ve Performans \u0130pu\u00e7lar\u0131<\/h3>\n
OpenCSV'yi kullan\u0131rken dikkate alman\u0131z gereken baz\u0131 en iyi uygulamalar ve performans ipu\u00e7lar\u0131:<\/p>\n
1.  Kaynak Y\u00f6netimi (try-with-resources<\/code>):<\/strong> Her zaman CSVReader<\/code>, CSVWriter<\/code>, FileReader<\/code> ve FileWriter<\/code> gibi kaynaklar\u0131 try-with-resources<\/code> blo\u011fu i\u00e7inde kullan\u0131n. Bu, kaynaklar\u0131n otomatik olarak kapat\u0131lmas\u0131n\u0131 sa\u011flayarak bellek s\u0131z\u0131nt\u0131lar\u0131n\u0131 ve dosya kilitleme sorunlar\u0131n\u0131 \u00f6nler.
\n2.  B\u00fcy\u00fck Dosyalar \u0130\u00e7in Bellek Y\u00f6netimi:<\/strong>
\n    *   Okuma:<\/strong> \u00c7ok b\u00fcy\u00fck CSV dosyalar\u0131n\u0131 okurken CSVReader.readAll()<\/code> yerine CSVReader.readNext()<\/code> metodunu bir d\u00f6ng\u00fc i\u00e7inde kullan\u0131n. Bu, t\u00fcm dosyan\u0131n i\u00e7eri\u011finin belle\u011fe y\u00fcklenmesini engeller ve bellek ta\u015fmas\u0131 (OutOfMemoryError) riskini azalt\u0131r.
\n    *   Yazma:<\/strong> Benzer \u015fekilde, b\u00fcy\u00fck veri k\u00fcmelerini yazarken CSVWriter.writeNext()<\/code> metodunu sat\u0131r sat\u0131r kullan\u0131n.
\n3.  Karakter Kodlamas\u0131 (UTF-8):<\/strong> \u00d6zellikle T\u00fcrk\u00e7e karakterler veya uluslararas\u0131 karakterler i\u00e7eren CSV dosyalar\u0131yla \u00e7al\u0131\u015f\u0131rken karakter kodlamas\u0131n\u0131 belirtmek \u00f6nemlidir. FileReader<\/code> veya FileWriter<\/code> yerine InputStreamReader<\/code> ve OutputStreamWriter<\/code> kullanarak karakter kodlamas\u0131n\u0131 (\u00f6rne\u011fin, StandardCharsets.UTF_8<\/code>) a\u00e7\u0131k\u00e7a belirtebilirsiniz.<\/p>\n
\/\/ Okuma\n    try (CSVReader reader = new CSVReader(new InputStreamReader(new FileInputStream(dosyaYolu), StandardCharsets.UTF_8))) {\n        \/\/ ...\n    }\n\n    \/\/ Yazma\n    try (CSVWriter writer = new CSVWriter(new OutputStreamWriter(new FileOutputStream(dosyaYolu), StandardCharsets.UTF_8))) {\n        \/\/ ...\n    }<\/code><\/pre>\n
4.  Hata Y\u00f6netimi:<\/strong> IOException<\/code>, CsvValidationException<\/code>, CsvDataTypeMismatchException<\/code> gibi istisnalar\u0131 uygun \u015fekilde yakalay\u0131n ve kullan\u0131c\u0131lara anlaml\u0131 geri bildirim sa\u011flay\u0131n veya loglama yap\u0131n.
\n5.  Bo\u015f Sat\u0131rlar\u0131 ve Alanlar\u0131 Y\u00f6netme:<\/strong> OpenCSV, bo\u015f sat\u0131rlar\u0131 ve alanlar\u0131 varsay\u0131lan olarak do\u011fru \u015fekilde i\u015fler. Ancak, uygulaman\u0131z\u0131n \u00f6zel gereksinimleri varsa, CSVReaderBuilder<\/code> veya CsvToBeanBuilder<\/code> \u00fczerindeki withIgnoreEmptyLines()<\/code> gibi metotlar\u0131 veya \u00f6zel d\u00f6n\u00fc\u015ft\u00fcr\u00fcc\u00fcleri kullanabilirsiniz.
\n6.  Performans Optimizasyonu (Yazma):<\/strong> B\u00fcy\u00fck dosyalar yazarken, CSVWriter<\/code>'\u0131n dahili bir tamponu vard\u0131r. Daha iyi performans i\u00e7in writer.flush()<\/code> metodunu periyodik olarak \u00e7a\u011f\u0131rabilirsiniz (ancak try-with-resources<\/code> blo\u011fu sonunda otomatik olarak kapan\u0131rken bu \u00e7a\u011fr\u0131 yap\u0131l\u0131r).<\/p>\n
Sonu\u00e7<\/h3>\n
OpenCSV k\u00fct\u00fcphanesi, Java geli\u015ftiricileri i\u00e7in CSV dosyalar\u0131n\u0131 okuma ve yazma i\u015flemlerini \u00f6nemli \u00f6l\u00e7\u00fcde basitle\u015ftiren g\u00fc\u00e7l\u00fc ve esnek bir ara\u00e7t\u0131r. CSVReader<\/code> ve CSVWriter<\/code> s\u0131n\u0131flar\u0131 arac\u0131l\u0131\u011f\u0131yla temel okuma\/yazma i\u015flemlerinden, CSVReaderBuilder<\/code> ve CSVWriterBuilder<\/code> ile geli\u015fmi\u015f konfig\u00fcrasyonlara kadar geni\u015f bir yelpazede i\u015flevsellik sunar.<\/p>\n
\u00d6zellikle CsvToBean<\/code> ve StatefulBeanToCsv<\/code> ile sunulan nesne haritalama yetene\u011fi, CSV verilerini Java nesneleriyle do\u011frudan e\u015fle\u015ftirerek kodun okunabilirli\u011fini, bak\u0131m\u0131n\u0131 ve tip g\u00fcvenli\u011fini art\u0131r\u0131r. Bu \u00f6zellik, i\u015f mant\u0131\u011f\u0131n\u0131 veri ayr\u0131\u015ft\u0131rma detaylar\u0131ndan ay\u0131rarak geli\u015ftiricilerin daha karma\u015f\u0131k i\u015flevselliklere odaklanmas\u0131n\u0131 sa\u011flar.<\/p>\n
Bu makalede sunulan \u00f6rnekler ve a\u00e7\u0131klamalar, OpenCSV'yi projelerinize entegre etmek ve CSV i\u015fleme g\u00f6revlerini verimli bir \u015fekilde yerine getirmek i\u00e7in sa\u011flam bir temel sa\u011flam\u0131\u015ft\u0131r. Do\u011fru kullan\u0131m ve en iyi uygulamalarla OpenCSV, veri al\u0131\u015fveri\u015fi gereksinimleriniz i\u00e7in vazge\u00e7ilmez bir ara\u00e7 haline gelecektir.<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"OpenCSV CSVReader CSVWriter \u00d6rnekleri ile Kapsaml\u0131 CSV \u0130\u015fleme Rehberi\nGiri\u015f: CSV Dosyalar\u0131 ve Veri Y\u00f6netimindeki Rol\u00fc\nVeri, modern yaz\u0131l\u0131m","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_page_header_type":"","csco_page_load_nextpost":"","csco_page_subscribe_form":"","csco_page_contact_form":"","footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-32388","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-genel","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"\nOpenCSV CSVReader CSVWriter \u00d6rnekleri ile Kapsaml\u0131 CSV \u0130\u015fleme Rehberi - Kodlar\u0131n Gizemli D\u00fcnyas\u0131<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fatihsoysal.com\/blog\/opencsv-csvreader-csvwriter-ornekleri-ile-kapsamli-csv-isleme-rehberi\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"OpenCSV CSVReader CSVWriter \u00d6rnekleri ile Kapsaml\u0131 CSV \u0130\u015fleme Rehberi\" \/>\n<meta property=\"og:description\" content=\"OpenCSV CSVReader CSVWriter \u00d6rnekleri ile Kapsaml\u0131 CSV \u0130\u015fleme Rehberi Giri\u015f: CSV Dosyalar\u0131 ve Veri Y\u00f6netimindeki Rol\u00fc Veri, modern yaz\u0131l\u0131m\" \/>\n<meta property=\"og:url\" content=\"https:\/\/fatihsoysal.com\/blog\/opencsv-csvreader-csvwriter-ornekleri-ile-kapsamli-csv-isleme-rehberi\/\" \/>\n<meta property=\"og:site_name\" content=\"Kodlar\u0131n Gizemli D\u00fcnyas\u0131\" \/>\n<meta property=\"article:published_time\" content=\"2025-10-21T02:41:14+00:00\" \/>\n<meta name=\"author\" content=\"Fatih Soysal\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Yazan:\" \/>\n\t<meta name=\"twitter:data1\" content=\"Fatih Soysal\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tahmini okuma s\u00fcresi\" \/>\n\t<meta name=\"twitter:data2\" content=\"24 dakika\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/opencsv-csvreader-csvwriter-ornekleri-ile-kapsamli-csv-isleme-rehberi\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/opencsv-csvreader-csvwriter-ornekleri-ile-kapsamli-csv-isleme-rehberi\/\"},\"author\":{\"name\":\"Fatih Soysal\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"headline\":\"OpenCSV CSVReader CSVWriter \u00d6rnekleri ile Kapsaml\u0131 CSV \u0130\u015fleme Rehberi\",\"datePublished\":\"2025-10-21T02:41:14+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/opencsv-csvreader-csvwriter-ornekleri-ile-kapsamli-csv-isleme-rehberi\/\"},\"wordCount\":2463,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/fatihsoysal.com\/blog\/opencsv-csvreader-csvwriter-ornekleri-ile-kapsamli-csv-isleme-rehberi\/#respond\"]}],\"copyrightYear\":\"2025\",\"copyrightHolder\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/opencsv-csvreader-csvwriter-ornekleri-ile-kapsamli-csv-isleme-rehberi\/\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/opencsv-csvreader-csvwriter-ornekleri-ile-kapsamli-csv-isleme-rehberi\/\",\"name\":\"OpenCSV CSVReader CSVWriter \u00d6rnekleri ile Kapsaml\u0131 CSV \u0130\u015fleme Rehberi - 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