Analizzare XML A JAVA POJO in modo efficiente

È possibile utilizzare JAXB per convertire XML in Java POJO. Ma prima di finalizzare la soluzione controlla questo sito per il confronto delle prestazioni.

Per coloro che cercano il codice JAXB per convertire xml in oggetto java:

//Convert xml to String first
Element partyLoaderRequest; // your xml data
String xmlString = new XMLOutputter().outputString(partyLoaderRequest);   
InputStream is = new ByteArrayInputStream(xmlString.getBytes());
DocumentBuilder docBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document document = docBuilder.parse(is);
org.w3c.dom.Element varElement = document.getDocumentElement();
JAXBContext context = JAXBContext.newInstance(Person.class);
Unmarshaller unmarshaller = context.createUnmarshaller();
JAXBElement<Person> loader = unmarshaller.unmarshal(varElement, Person.class);
Person inputFromXml = loader.getValue();

Mentre Person ha annotazioni XML corrette:

@XmlRootElement(name="Person")
public class CimbWlAdminUserAmendInput {
    @XmlElement(name="companyName",required=true,nillable=false) 
    private String companyName;
    ...
    //setters getters
    @XmlTransient
    public String getCompanyName() {
        return companyName;
    }

    public void setCompanyName(String companyName) {
        this.companyName = companyName;
    }
}

La serializzazione e la deserializzazione possono essere gestite da JacksonXmlModule.

// Item.class - use lombok or create g/setters
@JsonPropertyOrder({"name", "description", "note"})
public class Item { 
   private String name;
   private String description;
   private String note;
}


// Test.class
package hello.service;

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.dataformat.xml.JacksonXmlModule;
import com.fasterxml.jackson.dataformat.xml.XmlMapper;

import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlRootElement;
import hello.entity.Item;
import org.junit.Before;

import org.junit.Test;

import java.util.ArrayList;
import java.util.List;

import static org.junit.Assert.*;

public class NameServiceImplTest {

    ObjectMapper objectMapper;

    @Before
    public void setup() {
        JacksonXmlModule xmlModule = new JacksonXmlModule();
        xmlModule.setDefaultUseWrapper(false);
        this.objectMapper = new XmlMapper(xmlModule);
        this.objectMapper.enable(SerializationFeature.INDENT_OUTPUT);
    }

    @Test
    public void serializeTest() {

        // Wrapper
        @JacksonXmlRootElement(localName = "names")
        class Names {
            public List<Item> item = new ArrayList<>();
        }

        Item item = new Item();
        item.setName("Vladimir");
        item.setDescription("Desc");
        item.setNote("Note");

        Item item2 = new Item();
        item2.setName("Iva");
        item2.setDescription("Desc2");
        item2.setNote("Note2");

        Names names = new Names();
        names.item.add(item);
        names.item.add(item2);

        try {
            String xml = objectMapper.writeValueAsString(names);
            assertNotNull(xml);
            System.out.println(xml);
        } catch (Exception e) { // IOException
            System.out.println(e.getMessage());
            fail();
        }
    }

    @Test
    public void deserializeTest() {
        String xml = "<names>" +
                "<item><name>name</name><description>desc</description><note>note</note></item>" +
                "<item><name>name</name><description>desc</description><note>note</note></item>" +
                "</names>";

        try {
            List<Item> names = objectMapper.readValue(xml, new TypeReference<List<Item>>() {});
            names.forEach(item -> {

                assertEquals("name", item.getName());
                assertEquals("desc", item.getDescription());
                assertEquals("note", item.getNote());

            } );
        } catch (Exception e) { // IOException

        }


    }
}