Mule: Is there simple way of converting XML to JSON

Question

Is there simple way of converting XML to JSON, without binding XML to a java object first?

Just like how this does it -- http://www.utilities-online.info/xmltojson/

Answer 1

You can build a custom transformer[1] based on json-lib[2].

[1] http://www.mulesoft.org/documentation/display/current/Creating+Custom+Transformers

[2] http://json-lib.sourceforge.net/

Answer 2

Here's the implementation using link 1 from Pontus and FasterXML/Jackson

import java.util.List;

import org.codehaus.jackson.map.ObjectMapper;
import org.mule.api.MuleMessage;
import org.mule.api.transformer.DiscoverableTransformer;
import org.mule.api.transformer.TransformerException;
import org.mule.transformer.AbstractMessageTransformer;
import com.fasterxml.jackson.dataformat.xml.XmlMapper;

public class XmlToJsonTransformer extends AbstractMessageTransformer implements
   DiscoverableTransformer {

public Object transformMessage(MuleMessage message, String outputEncoding)
        throws TransformerException {

    try {
        String xml = (String) message.getPayload();

        XmlMapper xmlMapper = new XmlMapper();
        List entries = xmlMapper.readValue(xml, List.class);

        ObjectMapper jsonMapper = new ObjectMapper();
        String json = jsonMapper.writeValueAsString(entries);
        return json;
    } catch (Exception e) {
        System.out.println("Error: " + e);
        e.printStackTrace();
    }
    return null;
}

@Override
public int getPriorityWeighting() {
    return 0;
}

@Override
public void setPriorityWeighting(int weighting) {
}
}

The flow could look something like this:

<flow name="xmltojsontransformerFlow1" doc:name="xmltojsontransformerFlow1">
    <quartz:inbound-endpoint jobName="job"
        repeatInterval="0" repeatCount="0" startDelay="300" responseTimeout="10000"
        doc:name="Quartz">
        <quartz:event-generator-job />
    </quartz:inbound-endpoint>
    <parse-template
        location="/Users/tjs/MuleStudio/workspace3/xmltojsontransformer/src/main/resources/cd_catalog.xml"
        doc:name="Parse Template" />
    <custom-transformer class="cc.notsoclever.mule.XmlToJsonTransformer" doc:name="XmlToJson"/>
    <logger message="#[payload]" level="INFO" doc:name="Logger" />
</flow>

Answer 3

This what I ended up doing --

  <custom-transformer class="com.mycompany.transformer.XmlToJson" name="XmlToJson" doc:name="Java"/>

  <flow name="HTTP" doc:name="HTTP">
    <http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="8081" path="test" doc:name="HTTP" contentType="application/json"/>
    <http:outbound-endpoint exchange-pattern="request-response" method="GET" address="http://server-address.com" doc:name="service-call"/>
    <object-to-string-transformer doc:name="Object to String"/>
    <transformer ref="XmlToJson" doc:name="Transformer Reference"/>
</flow>

Here is XmlToJson.java --

import org.json.XML;
import org.mule.api.transformer.TransformerException;
import org.mule.transformer.AbstractTransformer;

public class XmlToJson extends AbstractTransformer{

@Override
protected Object doTransform(Object src, String enc)
        throws TransformerException {
    JSONObject jsonObj = XML.toJSONObject((String) src);
            return  jsonObj.toString();
}
}

Answer 4

Use the XML to Json transformer in Mule ESB or use the Dataweave transformer.