Read the data from CSV file and Map it to java object in java.

If you want to read the CSV file and store the data into java object no need to set the data into java object one by one. Opencsv has given a nice feature for this.

Step 1- Create CSV file."worldcup.csv"

1975,WestInddies,Australia,17 Run
1979,WestInddies,England,92 Run
1983,India,WestInddies,43 Run
1987,Australia,England,7 Run
1992,Pakistan,England,22 Run
1996,Sri Lanka,Australia,7 Wicket
1999,Australia,Pakistan,8 Wicket
2003,Australia,India,125 Run
2007,Australia,Sri Lanka,53 Run
2011,India,Sri Lanka,6 Wicket
2015,Australia,New Zeland,7 Wicket



Step 2- Create pojo with appropriate member. In my case I have created Country.java with 4 member-
private String years;
private String winnerCountryName;
private String looserCountryName;
private String winningDetails;

Step 3- Create ColumnPositionMappingStrategy class object and call setType() method of this class by passing Country.class parameter
ColumnPositionMappingStrategy strat = new ColumnPositionMappingStrategy();
strat.setType(Country.class);

Step 4- Create String array as member name of pojo class and set this Strign array into strat object.
String[] columns = new String[]{"years", "winnerCountryName", "looserCountryName", "winningDetails"};
strat.setColumnMapping(columns);

Step 5- Create CsvToBean class object.
CsvToBean csv = new CsvToBean();

Step 6- Create CSVReader class object.
String csvFilename = "D:\\Ashish\\Personal\\WebApplication1\\worldcup.csv";
CSVReader csvReader = new CSVReader(new FileReader(csvFilename));

Step 7- Call csv.parse(strat, csvReader) method and get List object with all the data.

Step 8- Iterate this list and get Country class object
Country country = (Country) object;

Step 9- Call appropriate getter method of country class and get the data.

Example:

CSVReadWrite.java

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

package com.atozjavatutorials; import com.opencsv.CSVReader; import com.opencsv.CSVWriter; import com.opencsv.bean.ColumnPositionMappingStrategy; import com.opencsv.bean.CsvToBean; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import java.util.ArrayList; import java.util.List; public class CSVReadWrite { public static void main(String[] args) { try { mapJavaBeanExample(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } public static void mapJavaBeanExample() throws FileNotFoundException { ColumnPositionMappingStrategy strat = new ColumnPositionMappingStrategy(); strat.setType(Country.class); String[] columns = new String[]{"years", "winnerCountryName", "looserCountryName", "winningDetails"}; strat.setColumnMapping(columns); CsvToBean csv = new CsvToBean(); String csvFilename = "D:\\Ashish\\Personal\\WebApplication1\\worldcup.csv"; CSVReader csvReader = new CSVReader(new FileReader(csvFilename)); List list = csv.parse(strat, csvReader); for (Object object : list) { Country country = (Country) object; System.out.print("["+country.getYears() + "]:[" + country.getWinnerCountryName() + "] Win againest ["); System.out.print(country.getLooserCountryName() + "] by ["); System.out.println(country.getWinningDetails() + "]"); } } }

Output:

[1975]:[WestInddies] Win againest [Australia] by [17 Run]
[1979]:[WestInddies] Win againest [England] by [92 Run]
[1983]:[India] Win againest [WestInddies] by [43 Run]
[1987]:[Australia] Win againest [England] by [7 Run]
[1992]:[Pakistan] Win againest [England] by [22 Run]
[1996]:[Sri Lanka] Win againest [Australia] by [7 Wicket]
[1999]:[Australia] Win againest [Pakistan] by [8 Wicket]
[2003]:[Australia] Win againest [India] by [125 Run]
[2007]:[Australia] Win againest [Sri Lanka] by [53 Run]
[2011]:[India] Win againest [Sri Lanka] by [6 Wicket]
[2015]:[Australia] Win againest [New Zeland] by [7 Wicket]