Converting an CSV file to a JSON object in Java

Question

Is there an open source java library to convert a CSV (or XLS) file to a JSON object?

I tried using json.cdl, but somehow it does not seem to work for large CSV stri

Answer 1

Here is a class I generated to return JSONArray, not just to print to a file.

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.dataformat.csv.CsvMapper;
import com.fasterxml.jackson.dataformat.csv.CsvSchema;
import org.json.simple.JSONArray;
import org.json.simple.parser.JSONParser;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


import java.io.File;
import java.util.List;
import java.util.Map;


public class CsvToJson {

private static final Logger log = LoggerFactory.getLogger(UtilsFormat.class);
private static CsvToJson instance;


public static JSONArray convert(File input) throws Exception {

    JSONParser parser = new JSONParser();
    CsvSchema csvSchema = CsvSchema.builder().setUseHeader(true).build();
    CsvMapper csvMapper = new CsvMapper();

    // Read data from CSV file
    List readAll = csvMapper.readerFor(Map.class).with(csvSchema).readValues(input).readAll();

    ObjectMapper mapper = new ObjectMapper();

    JSONArray jsonObject = (JSONArray) parser.parse(mapper.writerWithDefaultPrettyPrinter().writeValueAsString(readAll));
    System.out.print(jsonObject.toString());

    return new JSONArray();
}
}