Converting Java Array/Collection to JSON array

Question

My Java code returns a Collection (ArrayList) and the resulting JSON produced by JAXB looks like:

{"todo":[{"name":"CAMPBELL","sales":"3","time":"1331662363931"},
{"name":"FRESNO","sales":"2","time":"1331662363931"}]}

But, is there a way I can make it look like:

[{"name":"CAMPBELL","sales":"3","time":"1331662363931"},
{"name":"FRESNO","sales":"2","time":"1331662363931"}]

Is there a way in Java/JAXB or maybe in AJAX callback using responseText. .

BTW, I've also tried with Java array but it made no difference.

Any help will be appreciated.

Matthew Flaschen · Accepted Answer · 2012-03-13 18:50:39Z

1

All you need is:

var todo = resp.todo;

where resp is the whole JSON response. Note that this is actually good design. A root array is not recommended due to JSON hijacking.

edited Mar 13, 2012 at 18:50

answered Mar 13, 2012 at 18:39

Matthew Flaschen

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3 Comments

user655577 Over a year ago

Did you mean responseText.todo? I tried both resp.todo and responseText.todo in FireBug I can see the value of var todo as undefined

Matthew Flaschen Over a year ago

@user655577, Felix is right. You do need to parse the JSON. Are you using a library or doing it yourself? If the latter, you can use json2.

user655577 Over a year ago

Sorry my bad, I forgot to parse the JSON. It's working now. It was simple, but i'm new to JavaScript.

bdoughan · Accepted Answer · 2012-03-15 17:13:23Z

Note: I'm the EclipseLink JAXB (MOXy) lead and a member of the JAXB 2 (JSR-222) expert group.

Instead of correcting bad JSON on the client, you could fix the problem on the server. Below is an example of how EclipseLink JAXB (MOXy) could be used to produce the desired JSON:

Demo

package forum9689970;

import java.io.StringReader;
import java.util.List;
import javax.xml.bind.*;
import javax.xml.transform.stream.StreamSource;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance(SalesPerson.class);

        Unmarshaller unmarshaller = jc.createUnmarshaller();
        unmarshaller.setProperty("eclipselink.media-type", "application/json");
        unmarshaller.setProperty("eclipselink.json.include-root", false);
        String jsonString = "[{\"name\":\"CAMPBELL\",\"sales\":\"3\",\"time\":\"1331662363931\"},{\"name\":\"FRESNO\",\"sales\":\"2\",\"time\":\"1331662363931\"}]";
        StreamSource json = new StreamSource(new StringReader(jsonString));
        List<SalesPerson> salesPeople = (List<SalesPerson>) unmarshaller.unmarshal(json, SalesPerson.class).getValue();

        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.setProperty("eclipselink.media-type", "application/json");
        marshaller.setProperty("eclipselink.json.include-root", false);
        marshaller.marshal(salesPeople, System.out);
    }

}

SalesPerson

package forum9689970;

import javax.xml.bind.annotation.*;

@XmlAccessorType(XmlAccessType.FIELD)
public class SalesPerson {

    private String name;
    private String sales;
    private String time;

}

Output

[ {
   "name" : "CAMPBELL",
   "sales" : "3",
   "time" : "1331662363931"
}, {
   "name" : "FRESNO",
   "sales" : "2",
   "time" : "1331662363931"
} ]

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