Java HTML / XML How to - Read/write multilevel xml file via Jaxb

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Question

We would like to know how to read/write multilevel xml file via Jaxb.

Answer

<?xml version="1.0" encoding="UTF-8"?>
    <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" targetNamespace="http://www.serus.com" xmlns:ns1="http://www.serus.com">
      <xs:element name="part">
        <xs:complexType> 
          <xs:sequence minOccurs="1" maxOccurs="1">
            <xs:element ref="ns1:Product_Number"/>
            <xs:element ref="ns1:Product_Type"/>
            <xs:element ref="ns1:Product_Version"/>
            <xs:element ref="ns1:Status"/>
            <xs:choice minOccurs="0" maxOccurs="unbounded">
              <xs:element ref="ns1:part"/>
            </xs:choice>
          </xs:sequence>
        </xs:complexType>
      </xs:element>
      <xs:element name="Product_Number" type="xs:NCName"/>
      <xs:element name="Product_Type" type="xs:NCName"/>
      <xs:element name="Product_Version" type="xs:NCName"/>
      <xs:element name="Status" type="xs:NCName"/>
    </xs:schema>

Java code:

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
//from ww w  . j  av  a 2s . co m
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlTransient;

@XmlRootElement(name = "part")
public class Product implements Serializable {

  public static Product fromXML(InputStream in) throws Exception {
    JAXBContext context = JAXBContext.newInstance(Product.class);
    Unmarshaller um = context.createUnmarshaller();
    return (Product) um.unmarshal(in);
  }

  private static final long serialVersionUID = 1L;
  @XmlElement(name = "Product_Number")
  private String partNumber;
  @XmlElement(name = "Product_Type")
  private String partType;
  @XmlElement(name = "Product_Version")
  private String partVersion;
  @XmlElement(name = "Status")
  private String status;
  @XmlElement(name = "part")
  private Collection<Product> subProducts = null;

  public static void main(String args[]) throws JAXBException {
    Product mainProduct = new Product("1m", "m", "1", "draft");
    Product level1 = new Product("l1", "l1", "11", "new");
    level1.addProduct(new Product("l2", "l2", "1", "new"));
    level1.addProduct(new Product("l2-2", "l2", "1", "new"));
    mainProduct.addProduct(level1);
    System.out.println(mainProduct.toXML());
  }

  public Product() {
  }

  public Product(String no, String type, String ver, String stat) {
    this.partNumber = no;
    this.partType = type;
    this.partVersion = ver;
    this.status = stat;
  }

  @XmlTransient
  public String getProductNumber() {
    return this.partNumber;
  }

  public void setProductNumber(String partNumber) {
    this.partNumber = partNumber;
  }

  @XmlTransient
  public String getProductType() {
    return this.partType;
  }

  public void setProductType(String partType) {
    this.partType = partType;
  }

  @XmlTransient
  public String getProductVersion() {
    return this.partVersion;
  }

  public void setProductVersion(String partVersion) {
    this.partVersion = partVersion;
  }

  @XmlTransient
  public String getStatus() {
    return this.status;
  }

  public void setStatus(String status) {
    this.status = status;
  }

  @XmlTransient
  public Collection<Product> getSubparts() {
    return this.subProducts;
  }

  public void setSubparts(Collection<Product> subparts) {
    this.subProducts = subparts;
  }

  public void addProduct(Product part) {
    if (this.subProducts == null) {
      this.subProducts = new ArrayList<Product>();
    }
    this.subProducts.add(part);
  }

  public void addProducts(Collection<Product> parts) {
    if (this.subProducts == null) {
      this.subProducts = new ArrayList<Product>();
    }

    this.subProducts.addAll(parts);
  }

  public String toXML() throws JAXBException {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    JAXBContext context = JAXBContext.newInstance(Product.class);
    Marshaller m = context.createMarshaller();
    m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
    m.marshal(this, out);
    return out.toString();
  }

}

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