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2016/05/04

[XStream] How to create XML via XStream (a more complex example)

Requirement
The XSD for xml is as following: 
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<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="Root">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="Attributes">
          <xs:complexType>
            <xs:sequence>
              <xs:element type="xs:string" name="WorkLoad"/>
              <xs:element type="xs:string" name="DetailDocCat"/>
              <xs:element type="xs:string" name="ScanDate"/>
              <xs:element type="xs:time" name="ScanTime"/>
              <xs:element type="xs:float" name="StockingNumber"/>
              <xs:element type="xs:string" name="CaseId"/>
              <xs:element name="PolicyNumbers">
                <xs:complexType>
                  <xs:sequence>
                    <xs:element type="xs:string" name="PolicyNumber" maxOccurs="unbounded" minOccurs="0"/>
                  </xs:sequence>
                </xs:complexType>
              </xs:element>
              <xs:element name="ProposalNums">
                <xs:complexType>
                  <xs:sequence>
                    <xs:element type="xs:string" name="ProposalNum" maxOccurs="unbounded" minOccurs="0"/>
                  </xs:sequence>
                </xs:complexType>
              </xs:element>
            </xs:sequence>
          </xs:complexType>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>

The resulting XML looks like this: 
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<Root>
  <Attributes>
    <WorkLoad>TW_NEWNBED</WorkLoad>
    <DetailDocCat>xxx要保書</DetailDocCat>
    <ScanDate>2016/03/02</ScanDate>
    <ScanTime>15:56:00</ScanTime>
    <StockingNumber>2016E000001</StockingNumber>
    <CaseId>ABCD-201600100001</CaseId>
    <PolicyNumbers>
      <PolicyNumber>A12345678</PolicyNumber>
    </PolicyNumbers>
    <ProposalNums>
      <ProposalNum>B87654321</ProposalNum>
    </ProposalNums>
  </Attributes>
</Root>


How-to
Step1. According xsd definition, creating classes to be serialized

 Root class looks like this: 
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package albert.practice.xstream.beans;

import java.io.Serializable;

import org.apache.commons.lang.builder.ToStringBuilder;
import org.apache.commons.lang.builder.ToStringStyle;

public class Root implements Serializable {

 private static final long serialVersionUID = 1L;

 private Attributes Attributes;

 public Attributes getAttributes() {
  return Attributes;
 }

 public void setAttributes(Attributes Attributes) {
  this.Attributes = Attributes;
 }

 @Override
 public String toString() {
  return ToStringBuilder.reflectionToString(this, ToStringStyle.MULTI_LINE_STYLE);
 }
}


Attributes class looks like this: 
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package albert.practice.xstream.beans;

import java.io.Serializable;
import java.util.List;

import org.apache.commons.lang.builder.ToStringBuilder;
import org.apache.commons.lang.builder.ToStringStyle;

public class Attributes implements Serializable {

 private static final long serialVersionUID = 1L;

 private String WorkLoad;

 private String DetailDocCat;

 private String ScanDate;

 private String ScanTime;

 private String StockingNumber;

 private String CaseId;

 private List<PolicyNumbers> PolicyNumbers;

 private List<ProposalNums> ProposalNums;

 public String getWorkLoad() {
  return WorkLoad;
 }

 public void setWorkLoad(String WorkLoad) {
  this.WorkLoad = WorkLoad;
 }

 public String getDetailDocCat() {
  return DetailDocCat;
 }

 public void setDetailDocCat(String DetailDocCat) {
  this.DetailDocCat = DetailDocCat;
 }

 public String getStockingNumber() {
  return StockingNumber;
 }

 public void setStockingNumber(String StockingNumber) {
  this.StockingNumber = StockingNumber;
 }

 public List<PolicyNumbers> getPolicyNumbers() {
  return PolicyNumbers;
 }

 public void setPolicyNumbers(List<PolicyNumbers> policyNumbers) {
  PolicyNumbers = policyNumbers;
 }

 public String getCaseId() {
  return CaseId;
 }

 public void setCaseId(String CaseId) {
  this.CaseId = CaseId;
 }

 public String getScanDate() {
  return ScanDate;
 }

 public void setScanDate(String ScanDate) {
  this.ScanDate = ScanDate;
 }

 public String getScanTime() {
  return ScanTime;
 }

 public void setScanTime(String ScanTime) {
  this.ScanTime = ScanTime;
 }

 public List<ProposalNums> getProposalNums() {
  return ProposalNums;
 }

 public void setProposalNums(List<ProposalNums> proposalNums) {
  ProposalNums = proposalNums;
 }

 @Override
 public String toString() {
  return ToStringBuilder.reflectionToString(this, ToStringStyle.MULTI_LINE_STYLE);
 }
}


PolicyNumbers looks like this: 
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package albert.practice.xstream.beans;

import java.io.Serializable;
import java.util.List;

import org.apache.commons.lang.builder.ToStringBuilder;
import org.apache.commons.lang.builder.ToStringStyle;

public class PolicyNumbers implements Serializable {

 private static final long serialVersionUID = 1L;

 private String PolicyNumber;
 private List<PolicyNumbers> PolicyNumberList;

 public List<PolicyNumbers> getPolicyNumberList() {
  return PolicyNumberList;
 }

 public void setPolicyNumberList(List<PolicyNumbers> policyNumberList) {
  PolicyNumberList = policyNumberList;
 }

 public PolicyNumbers(String policyNumber) {
  this.PolicyNumber = policyNumber;
 }

 public String getPolicyNumber() {
  return PolicyNumber;
 }

 public void setPolicyNumber(String policyNumber) {
  this.PolicyNumber = policyNumber;
 }

 public PolicyNumbers() {
  super();
 }

 @Override
 public String toString() {
  return ToStringBuilder.reflectionToString(this, ToStringStyle.MULTI_LINE_STYLE);
 }
}


ProposalNumbers looks like this: 
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package albert.practice.xstream.beans;

import java.io.Serializable;
import java.util.List;

import org.apache.commons.lang.builder.ToStringBuilder;
import org.apache.commons.lang.builder.ToStringStyle;

public class ProposalNums implements Serializable {

 private static final long serialVersionUID = 1L;

 private String ProposalNum;
 private List<ProposalNums> ProposalNumList;

 public String getProposalNum() {
  return ProposalNum;
 }

 public void setProposalNum(String proposalNum) {
  ProposalNum = proposalNum;
 }

 public List<ProposalNums> getProposalNumList() {
  return ProposalNumList;
 }

 public void setProposalNumList(List<ProposalNums> proposalNumList) {
  ProposalNumList = proposalNumList;
 }

 public ProposalNums(String proposalNum) {
  super();
  ProposalNum = proposalNum;
 }

 public ProposalNums() {
  super();
 }

 @Override
 public String toString() {
  return ToStringBuilder.reflectionToString(this, ToStringStyle.MULTI_LINE_STYLE);
 }

}


Step2. Utilize XStream API to fulfill our requirement 
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public class XStreamTestClient {

 public static void main(String[] args) throws IOException {

  // create an instance of beans and populate its fields:
  Attributes attribute = new Attributes();
  attribute.setWorkLoad("TW_NEWNBED");
  attribute.setDetailDocCat("xxx要保書");
  attribute.setScanDate("2016/03/02");
  attribute.setScanTime("15:56:00");
  attribute.setStockingNumber("2016E000001");
  attribute.setCaseId("ABCD-201600100001");

  List<PolicyNumbers> policyNumberList = new ArrayList<PolicyNumbers>();
  policyNumberList.add(new PolicyNumbers("A12345678"));

  attribute.setPolicyNumbers(policyNumberList);

  List<ProposalNums> proposalNumList = new ArrayList<ProposalNums>();
  proposalNumList.add(new ProposalNums("B87654321"));

  attribute.setProposalNums(proposalNumList);

  Root root = new Root();
  root.setAttributes(attribute);

  String xml = new XStreamTestClient().toXml(root);
  System.out.println(xml);

 }

 public String toXml(Root root) {
  // instantiate the XStream class
  XStream xStream = new XStream();

  // create an alias to the desired class:
  xStream.alias("Root", Root.class);
  xStream.alias("PolicyNumbers", PolicyNumbers.class);
  xStream.alias("ProposalNums", ProposalNums.class);

  // whenever you have a collection which doesn't need to display it's
  // root tag, you can map it as an implicit collection
  xStream.addImplicitCollection(Attributes.class, "PolicyNumbers");
  xStream.addImplicitCollection(Attributes.class, "ProposalNums");

  return xStream.toXML(root);
 }
}




Posted by Albert Kuo at 8:00 AM
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