Writing java object into .csv

Question

I have the java class below:

class DeviceUser{
private String d1;
@CsvBind
private Long u1;
@CsvBind
private Long lt;
@CsvBind
private DeviceUser ref;
//getters and setters
}

I want to write the data, stored in the DeviceUser object, into a .csv file.

output should be:
output.csv:
deviceId,6111,1200,deviceId,6111,1200,

Answer 1

To your class add the following method:

public String[] toArray() {
    String[] result = new String[6];
    result[0] = this.d1;
    result[1] = this.u2.toString();
    result[2] = this.lt.toString();
    result[3] = this.ref.getd1();
    result[4] = this.ref.getu2().toString();
    result[5] = this.ref.getlt().toString();
    return result;
}

And now use the following:

 CSVWriter writer = new CSVWriter(new FileWriter("yourfile.csv"), ',');
 // feed in your array (or convert your data to an array)
 writer.writeNext(deviceUser.toArray());
 writer.close();

Although it'll work, it's not how you want to do that. For writing objects to files it's better to write JSONs. I would recommend Google Gson.

Gson gson = new Gson();
gson.toJson(obj, new FileWriter("yourfile.csv"));