How to generate json string in required format in JAVA?

Question

I need to generate the JSON string in following format:

[{"param1":"value1","param2":"value2"},{"param1":"value3","param2":"value4"}]

I tried to store data in following way:

JSONArray jsonArray = JSONArray();

HashMap<String, String> hmap = new HashMap<String, String>();
hmap.put("param1", "value1");
hmap.put("param2", "value2");
jsonArray.add(hmap);

hmap = new HashMap<String, String>();
hmap.put("param1", "value3");
hmap.put("param2", "value4");
jsonArray.add(hmap);

System.out.print(jsonArray.toString());

But it generated the json string in following format:

["{param1:value1,param2:value2}", "{param1:value3,param2:value4}"]

What changes are need to get the string in required format?

stackoverflow.com/q/11143363/1007273 + json.org/java

hovanessyan
– hovanessyan

2013-05-31 09:43:13 +00:00
Commented May 31, 2013 at 9:43 — hovanessyan
– hovanessyan, Commented May 31, 2013 at 9:43

Sumit Desai · Accepted Answer · 2013-05-31 10:02:41Z

1

This should work. Use JSONObject instead of a map and add them to JSONArray.

JSONArray jsonArray = new JSONArray();

JSONObject jsonObject1= new JSONObject();
JSONObject jsonObject2= new JSONObject();

jsonObject1.put("param1", "value1");
jsonObject1.put("param2", "value2");
jsonArray.add(jsonObject1);


jsonObject2.put("param1", "value3");
jsonObject2.put("param2", "value4");
jsonArray.add(jsonObject2);

System.out.print(jsonArray.toString());

I would suggest a better alternative to use a third party library such as XStream, which does it for you.

edited May 31, 2013 at 10:02

answered May 31, 2013 at 9:53

Sumit Desai

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Balint Bako · Accepted Answer · 2013-05-31 10:04:05Z

0

Use Jettison and it will do exactly what you want

import org.codehaus.jettison.json.JSONArray;

public class JSONPrintTest extends TestCase{

public void testPrinting(){
    JSONArray jsonArray = new JSONArray();

    HashMap<String, String> hmap = new HashMap<String, String>();
    hmap.put("param1", "value1");
    hmap.put("param2", "value2");
    jsonArray.put(hmap);

    hmap = new HashMap<String, String>();
    hmap.put("param1", "value3");
    hmap.put("param2", "value4");
    jsonArray.put(hmap);

    System.out.print(jsonArray.toString());
}

}

Output: [{"param1":"value1","param2":"value2"},{"param1":"value3","param2":"value4"}]

answered May 31, 2013 at 10:04

Balint Bako

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