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,

Have you tried anything? Please, write your code from your attempt (even if not working), so people know you don't want just someone to do it for you. Googling I easily found this: howtodoinjava.com/3rd-party/… — Tom
– Tom, Commented Oct 24, 2016 at 8:55

xenteros · Accepted Answer · 2016-10-24 08:36:55Z

2

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"));

edited Oct 24, 2016 at 8:36

answered Oct 24, 2016 at 8:26

xenteros

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7 Comments

sachin10 Over a year ago

Thanks for reply but because of reference, it is printing that object twice.

xenteros Over a year ago

is the reference to the object itself or to another object??

sachin10 Over a year ago

i want , deviceId,6111,1200,deviceId,6111,1200. but is giving, deviceId,6111,1200,deviceId,6111,1200,deviceId,6111,1200

sachin10 Over a year ago

it can be same or different object of same type

xenteros Over a year ago

@sachin10 it's not possible. My code prints 6 values. Are you sure you're using it as I wrote?

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