Converting xml to json using jackson

Question

I want to convert an xml to json.

The format of of xml is as follows -

Answer 1

I was able to get the solution to this problem by using org.json API to convert source XML to JSONObject and then to JSON by Jackson API.

Code

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;

import org.apache.commons.io.IOUtils;
import org.json.JSONObject;
import org.json.XML;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;

...
...

try (InputStream inputStream = new FileInputStream(new File(
                "source.xml"))) {
    String xml = IOUtils.toString(inputStream);
    JSONObject jObject = XML.toJSONObject(xml);
    ObjectMapper mapper = new ObjectMapper();
    mapper.enable(SerializationFeature.INDENT_OUTPUT);
    Object json = mapper.readValue(jObject.toString(), Object.class);
    String output = mapper.writeValueAsString(json);
    System.out.println(output);
}

...
...

Answer 2

While working on a group project I ran into the same issue you have described. The solution we used to get this to work was to change our Maven dependency from Jackson to json-lib. We used this site as a guide: http://answers.oreilly.com/topic/278-how-to-convert-xml-to-json-in-java/

<dependency>
    <groupId>net.sf.json-lib</groupId>
    <artifactId>json-lib</artifactId>
    <version>2.4</version>
    <type>jar</type>
    <classifier>jdk15</classifier>
    <scope>compile</scope>
</dependency>

--$pli7

Answer 3

I also ran into this issue, using Jackson 2.5. My solution was to replace the implementation of javax.json.JsonObjectBuilder in use with my own, which when a new object is added behaves like this :

public class CustomJsonObjectBuilder implements JsonObjectBuilder {

  private final Map<String, JsonValue> jsonFragments;

  // other methods omitted for brevity

   public JsonObjectBuilder add(String name, JsonValue value) {
     if(jsonFragments.containsKey(name)) {
        JsonValue oldValue = jsonFragments.get(name);
        JsonArrayBuilder newBuilder = new JsonArrayBuilderImpl();
        if(oldValue instanceof JsonArray) {
            JsonArray theArray = (JsonArray) oldValue;
            for (JsonObject oldValues : theArray.getValuesAs(JsonObject.class)) {
                newBuilder.add(oldValues);
            }
        } else {
            newBuilder.add(oldValue);
        }
        newBuilder.add(value);
        jsonFragments.put(name, newBuilder.build());
     } else {
        jsonFragments.put(name, value);
     }
     return this;
   }