How to handle json array parsing with Jackson parser in Android

Question

Here is my structure of json data. It has huge amount of data similarly to this. I am using Jackson parser for parsing this.

{
 "dealers":
 {
  "google.com":{"id":1,"merchantname":"google","status":"active"},
  "apple.com":{"id":2,"merchantname":"apple","status":"active"}
 }
}

Code:

    while (jParser.nextToken() != JsonToken.END_OBJECT) {
            jParser.nextToken();

            while (jParser.nextToken() != JsonToken.END_OBJECT) {
                jParser.nextToken();

                while (jParser.nextToken() != JsonToken.END_OBJECT) {
                    jParser.nextToken();
                    String fieldname = jParser.getCurrentName();
                    if (fieldname != null) {

                        if ("id".equals(fieldname)) {
                            jParser.nextToken();
                            if (jParser.getText() != null)
                                merchantID = jParser.getText();
                            else
                                merchantID = "";
                        }

                        if ("merchantname".equals(fieldname)) {
                            jParser.nextToken();
                            if (jParser.getText() != null)
                                merchantname = jParser.getText();
                            else
                                merchantname = "";
                        }

                        if ("status".equals(fieldname)) {
                            jParser.nextToken();
                            if (jParser.getText() != null)
                                name = jParser.getText();
                        }

                    }

                }
            }
        }

The data is not parsed properly. Messed up with the jParser.nextToken() methods. Can anyone point out the mistake here?

There is no array in your json

Selvin
– Selvin

2013-10-07 18:51:43 +00:00
Commented Oct 7, 2013 at 18:51 — Selvin
– Selvin, Commented Oct 7, 2013 at 18:51
Updated code. It goes infinite through the loop.

intrepidkarthi
– intrepidkarthi

2013-10-07 19:02:33 +00:00
Commented Oct 7, 2013 at 19:02 — intrepidkarthi
– intrepidkarthi, Commented Oct 7, 2013 at 19:02

Michał Ziober · Accepted Answer · 2013-10-07 19:17:32Z

4

"dealers" property in JSON represents Map<String, POJO_CLASS>. You can easily convert it to below POJO classes:

class RootEntity {

    private Map<String, Entity> dealers;

    //getters,setters, toString
}

class Entity {

    private int id;
    private String merchantname;
    private String status;

    //getters,setters, toString
}

Example usage:

import java.io.File;
import java.io.IOException;
import java.util.Map;

import com.fasterxml.jackson.databind.ObjectMapper;

public class JacksonProgram {

    public static void main(String[] args) throws IOException {
        ObjectMapper mapper = new ObjectMapper();
        System.out.println(mapper.readValue(new File("/data/x.json"), RootEntity.class));
    }
}

prints:

RootEntity [dealers={google.com=Entity [id=1, merchantname=google, status=active], apple.com=Entity [id=2, merchantname=apple, status=active]}]

answered Oct 7, 2013 at 19:17

Michał Ziober

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5 Comments

intrepidkarthi Over a year ago

I am getting com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "id" (class com.juteralabs.perkmobile.models.AllDealerssModel), not marked as ignorable (3 known properties: , "id", "merchantname", "status" [truncated]])

Michał Ziober Over a year ago

1. No, but your code is really ugly and really hard to maintenance. 2. This exception suggests that you want to deserialize JSON to wrong POJO or your JSON looks differently than in question.

intrepidkarthi Over a year ago

It works. Thanks. But I am just curious to know what is wrong in the code I have posted? Unable to find out the mistake in that while loop.

Michał Ziober Over a year ago

How did you create "jParser" object? Debugger is your friend in this case.

intrepidkarthi Over a year ago

jParser = jfactory.createParser(data); And data is a String

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