Geek asks and answers

Creating json as json from JAXB and Jersey

I am working with a datamodel created using JAXB from which I can directly create XML

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>\
<metadata xmlns="http://musicbrainz.org/ns/mmd-2.0#" xmlns:ext="http://musicbrainz.org/ns/ext#-2.0">
<artist-list offset="0" count="1">
   <artist ext:score="100" type="Group" id="4302e264-1cf0-4d1f-aca7-2a6f89e34b36">       
       <name>Farming Incident</name>
       <ipi-list>
          <ipi>1001</ipi>
       </ipi-list>
   </artist>
</artist-list>
</metadata>

and using jersey also generates json using natural notation

"artist-list":
    {"offset":0,
     "count":1,
     "artist":[
         {"score":"100",
          "type":"Group",
          "id":"4302e264-1cf0-4d1faca7-2a6f89e34b36",
          "name":"Farming Incident",
          "ipi-list":
              {
                  "ipi":[
                       "1001"
                    ]
             }
          }]
     }

Xml is excellent, json is almost perfect, except that since Json directly supports arrays with elements like ipi-list and artist-list, it doesn't seem very json, is it possible to generate more json like json from my model?

Json MMD- http://svn.musicbrainz.org/mmd-schema/trunk/brainz-mmd2-jaxb/src/main/resources/musicbrainz_mmd-2.0.xsd JAXB Jersey,  http://svn.musicbrainz.org/search_server/trunk/servlet/src/main/java/org/musicbrainz/search/servlet/mmd2/ResultsWriter.java http://svn.musicbrainz.org/search_server/trunk/servlet/src/main/java/org/musicbrainz/search/servlet/mmd2/ArtistWriter.java

, Json XML , , , Json , ( json)

+5
5

. EclipseLink JAXB (MOXy) JAXB (JSR-222).

JSON-Binding EclipseLink JAXB (MOXy) .

(oxml.xml)

@XmlPath(".") MOXy . ".", MOXy, node.

<?xml version="1.0"?>
<xml-bindings
    xmlns="http://www.eclipse.org/eclipselink/xsds/persistence/oxm"
    package-name="forum10699038">
    <java-types>
        <java-type name="Metadata">
            <java-attributes>
                <xml-element java-attribute="artistList" xml-path="."/>
            </java-attributes>
        </java-type>
        <java-type name="Artist">
            <java-attributes>
                <xml-element java-attribute="ipiList" xml-path="."/>
            </java-attributes>
        </java-type>
    </java-types>
</xml-bindings>

jaxb.properties

MOXy JAXB, jaxb.properties , , .

javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory

Demo

XML-, JSON. , MOXy JSON.

package forum10699038;

import java.io.File;
import java.util.*;
import javax.xml.bind.*;

import org.eclipse.persistence.jaxb.JAXBContextProperties;

public class Demo {

    public static void main(String[] args) throws Exception {
        // READ FROM XML
        JAXBContext jcXML = JAXBContext.newInstance(Metadata.class);

        File xml = new File("src/forum10699038/input.xml");
        Unmarshaller unmarshaller = jcXML.createUnmarshaller();
        Metadata metadata = (Metadata) unmarshaller.unmarshal(xml);

        // WRITE TO JSON
        Map<String, Object> properties = new HashMap<String, Object>(3);
        properties.put(JAXBContextProperties.OXM_METADATA_SOURCE, "forum10699038/oxm.xml");
        properties.put(JAXBContextProperties.MEDIA_TYPE, "application/json");
        properties.put(JAXBContextProperties.JSON_INCLUDE_ROOT, false);
        JAXBContext jcJSON = JAXBContext.newInstance(new Class[] {Metadata.class}, properties);

        Marshaller marshaller = jcJSON.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(metadata, System.out);
    }

}


{
   "artist" : [ {
      "id" : "4302e264-1cf0-4d1f-aca7-2a6f89e34b36",
      "type" : "Group",
      "score" : "100",
      "name" : "Farming Incident",
      "ipi" : [ "1001" ]
   } ]
}

MOXy Jersey

MOXy JSON JAXB-RS, , :

, , , .

Input.xml

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<metadata xmlns="http://musicbrainz.org/ns/mmd-2.0#" xmlns:ext="http://musicbrainz.org/ns/ext#-2.0">
    <artist-list offset="0" count="1">
        <artist ext:score="100" type="Group"
            id="4302e264-1cf0-4d1f-aca7-2a6f89e34b36">
            <name>Farming Incident</name>
            <ipi-list>
                <ipi>1001</ipi>
            </ipi-list>
        </artist>
    </artist-list>
</metadata>

Metadata​​STRONG >

package forum10699038;

import javax.xml.bind.annotation.*;

@XmlRootElement
public class Metadata {

    @XmlElement(name="artist-list")
    ArtistList artistList;

}

ArtistList

package forum10699038;

import java.util.List;

public class ArtistList {

    private List<Artist> artist;

}


package forum10699038;

import javax.xml.bind.annotation.*;

@XmlType(propOrder={"name", "ipiList"})
public class Artist {

    @XmlAttribute
    private String id;

    @XmlAttribute
    private String type;

    @XmlAttribute(namespace="http://musicbrainz.org/ns/ext#-2.0")
    private String score;

    @XmlElement(name="ipi-list")
    private IPIList ipiList;

    private String name;

}

IPList

package forum10699038;

import java.util.List;

public class IPIList {

    private List<String> ipi;

}

-

@XmlSchema( 
    namespace = "http://musicbrainz.org/ns/mmd-2.0#", 
    elementFormDefault = XmlNsForm.QUALIFIED,
    xmlns={
        @XmlNs(prefix="", namespaceURI = "http://musicbrainz.org/ns/mmd-2.0#")
    }
) 
@XmlAccessorType(XmlAccessType.FIELD)
package forum10699038;

import javax.xml.bind.annotation.*;
+3

JSON, , JSOON , . , , , , , .

artist-list , ? ipi-list? , , , .

+1

. JSON/XML .:)

, (Gson ):

mapper = new ObjectMapper();
JsonNode root = mapper.createObjectNode();

JsonNode artist = mapper.createObjectNode();
artist.put("score", "100");
root.put("artist-list", artist);

ArrayNode ipiList = mapper.createArrayNode();
ipi.add("1001");
artist.put("ipi-list", ipiList);

. JSON . Json() - . : https://github.com/richardzcode/metrics/blob/master/src/main/java/com/rz/metrics/core/entities

.

JAXB , , :

@XmlElement(name = "ipi-list")
private List<Ipi> ipi;
+1

I managed to solve a JSON array and a primitive field error in the json json library. The secret ingredient is mentioned earlier. JSONConfiguration and ContextResolver magic. See My next post, it has a complete code sample, custom ContextResolver and the rest. An application class may be somewhat fuzzy at first glance.

How to serialize Java primitives using Jersey REST

  • json array for java null or singleton lists
  • primitive integer or logical fields without quotes
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