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

@Mouscellaneous basically answered this for you so please give him the credit.

Here is what I came up with:

package edu.apollogrp.csvtojson;

import au.com.bytecode.opencsv.bean.CsvToBean;
import au.com.bytecode.opencsv.bean.HeaderColumnNameMappingStrategy;
import org.codehaus.jackson.map.ObjectMapper;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.List;

public class ConvertCsvToJson {
    public static void main(String[] args) throws IOException, ClassNotFoundException {
        if (args.length > 1) {
            String pathToCsvFile = args[0];
            String javaBeanClassName = "edu.apollogrp.csvtojson.bean." + args[1];
            final File file = new File(pathToCsvFile);
            if (!file.exists()) {
                System.out.println("The file you specified does not exist. path=" + pathToCsvFile);
            }
            Class type = null;
            try {
                type = Class.forName(javaBeanClassName);
            } catch (ClassNotFoundException e) {
                System.out.println("The java bean you specified does not exist. className=" + javaBeanClassName);
            }

            HeaderColumnNameMappingStrategy strat = new HeaderColumnNameMappingStrategy();
            strat.setType(type);

            CsvToBean csv = new CsvToBean();
            List list = csv.parse(strat, new InputStreamReader(new FileInputStream(file)));
            System.out.println(new ObjectMapper().writeValueAsString(list));
        } else {
            System.out.println("Please specify the path to the csv file.");
        }
    }
}

I used maven to include the dependencies, but you could also download them manually and include them in your classpath.

    net.sf.opencsv
    opencsv
    2.0



    org.codehaus.jackson
    jackson-mapper-asl
    1.9.12


    org.codehaus.jackson
    jackson-core-asl
    1.9.12