Develop Reference

How to get the value of subelement from XML?

I want to get the value of the middle name from the below XML in JAVA.
<employee>
<emp1 name='firstName'>FNAme</emp1>
<emp1 name='middleName'>MNAme</emp1>
<emp1 name='LastName'>LNAme</emp1>
</employee>

this work for me pretty well:
java code
import java.io.File;
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
public class main
{
public static void main(String[] args) {
try {
File file = new File(".idea/company.xml");
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document document = db.parse(file);
document.getDocumentElement().normalize();
System.out.println("Root Element :" + document.getDocumentElement().getNodeName());
NodeList nList = document.getElementsByTagName("employee");
System.out.println("----------------------------");
for (int temp = 0; temp < nList.getLength(); temp++) {
Node nNode = nList.item(temp);
System.out.println("\nCurrent Element :" + nNode.getNodeName());
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element eElement = (Element) nNode;
System.out.println("First Name : " + eElement.getElementsByTagName("firstName").item(0).getTextContent());
System.out.println("Middle Name : " + eElement.getElementsByTagName("middleName").item(0).getTextContent());
System.out.println("Last Name : " + eElement.getElementsByTagName("lastName").item(0).getTextContent());
}
}
}
catch(IOException | ParserConfigurationException | SAXException e) {
System.out.println(e);
}
the xml look like this:
<?xml version="1.0"?>
<company>
<employee>
<firstName>FNAme</firstName>
<middleName>MNAme</middleName>
<lastName>LNAme</lastName>
</employee>
</company>

Store xml value as a Map using XPATH using JAVA

I am using XPATH to parse xml document,please find the xml below
<?xml version="1.0" encoding="UTF-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body>
<bookEvent>
<bookName>harry_potter</bookName>
<bookEntity>comic</bookEntity>
<bookEntityId>10987645</bookEntityId>
<bookParameter>
<name>Name1</name>
<value>value1</value>
</bookParameter>
<bookParameter>
<name>Name2</name>
<value>value2</value>
</bookParameter>
<bookParameter>
<name>Name3</name>
<value>value3</value>
</bookParameter>
<bookParameter>
<name>Name4</name>
<value>value4</value>
</bookParameter>
<bookParameter>
<name>Name5</name>
<value>value5</value>
</bookParameter>
</bookEvent>
</soap:Body>
</soap:Envelope>
Here I would like to convert BookParameters to Map like below
{"Name1":"value1","Name2":"value2" etc}
I have tried the below code and i can get a Map but not in the expected format,
try{
Map<String,String> eventParameters = new HashMap<>();
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse("book.xml");
XPathFactory xPathfactory = XPathFactory.newInstance();
XPath xpath = xPathfactory.newXPath();
NodeList nodeList = (NodeList)xpath.compile("//bookEvent//eventParameter").evaluate(doc, XPathConstants.NODESET);
for (int i = 0; i < nodeList.getLength(); i++) {
Node node = nodeList.item(i);
if(node.hasChildNodes()) {
NodeList childNodes = node.getChildNodes();
for (int j = 0; j < childNodes.getLength(); j++) {
Node childNode = childNodes.item(j);
if (childNode.getNodeType() == Node.ELEMENT_NODE) {
System.out.println(childNode.getNodeName()+"::"+childNode.getNodeValue()+"::"+childNode.getTextContent());
eventParameters.put(childNode.getTextContent(),childNode.getTextContent());
}
}
}
}
System.out.println("print map::"+eventParameters);
} catch (Exception e) {
e.printStackTrace();
}
The output looks like this
print map::{Name3=Name3, Name4=Name4, value5=value5, Name5=Name5, value2=value2, value1=value1, value4=value4, value3=value3, Name1=Name1, Name2=Name2}
Please somebody guide me to create a below map from the xml,Any help would be appreciable.
{"Name1":"value1","Name2":"value2" etc}

You can do it as a one-liner in XPath 3.1:
map:merge(//bookParameter!map{string(name): string(value)})
=> serialize(map{'method':'json'})
You can run XPath 3.1 from Java by installing Saxon-HE 9.8 (open source)

Use Below code :
import java.io.File;
import java.util.LinkedHashMap;
import java.util.Map;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
public class ReadXMLFile {
public static Map<String,String> hMap = new LinkedHashMap<>();
public static void main(String argv[]) {
try {
File fXmlFile = new File("C:\\Users\\jaikant\\Desktop\\QUESTION.xml");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(fXmlFile);
doc.getDocumentElement().normalize();
NodeList nodeList = doc.getElementsByTagName("bookParameter");
for (int parameter = 0; parameter < nodeList.getLength(); parameter++) {
Node node = nodeList.item(parameter);
if (node.getNodeType() == Node.ELEMENT_NODE) {
Element eElement = (Element) node;
String name = eElement.getElementsByTagName("name").item(0).getTextContent();
String value = eElement.getElementsByTagName("value").item(0).getTextContent();
hMap.put(name, value);
}
}
} catch (Exception e) {
e.printStackTrace();
}
hMap.forEach((h,k) -> {
System.out.println(h + ":" + k);
});
}
}
It will print exactly what you are looking for.

How to go from one field to another in XML

<table name="categoryConfigTable">
<row>
<field name="mediaConfigId">0</field>
<field name="startDate">2005-01-01</field>
<field name="endDate">2025-12-31</field>
<field name="class">all</field>
<field name="CID">10</field>
<field name="sequenceNum">1</field>
<field name="parentCID">NULL</field>
</row>
</table>
This is part of my XML file, I want to retrieve CID values having parentCID as NULL
Part of my JAVA code is
`
public static void main(String[] args) {
try {
File fXmlFile = new File("/home/media.xml");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(fXmlFile);
doc.getDocumentElement().normalize();
System.out.println("Root element :" + doc.getDocumentElement().getNodeName());
NodeList nlist = doc.getElementsByTagName("field");
int len = nlist.getLength();
for (int i = 0; i < len; i++) {
Node node = nlist.item(i);
if (node.getNodeType() == Node.ELEMENT_NODE) {
Element e = (Element)node;
String attrVal = e.getAttribute("name");
try {
if(attrVal.equalsIgnoreCase("parentCID") && e.getTextContent().equals("NULL"))
{
System.out.println("root element" +e.getTextContent());
}
}
catch (IOException ie) {
//exception handling left as an exercise for the reader
}
}
}}catch (Exception e) {
e.printStackTrace();
}
}`
From this I get all parentCID having value as null but I want to go to CID how this can be done?

you can get it like this
import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
public class ReadXMLFile {
public static void main(String argv[]) {
try {
File fXmlFile = new File("src/test.xml");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory
.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(fXmlFile);
doc.getDocumentElement().normalize();
System.out.println("Root element :"
+ doc.getDocumentElement().getNodeName());
NodeList nList = doc.getElementsByTagName("row");
System.out.println("----------------------------");
for (int temp = 0; temp < nList.getLength(); temp++) {
Node nNode = nList.item(temp);
//System.out.println("\nCurrent Element :" + nNode.getNodeName());
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element eElement = (Element) nNode;
NodeList nList2 = eElement.getElementsByTagName("field");
String cidvalue=null;
for (int temp1 = 0; temp1 < nList2.getLength(); temp1++) {
Node nNode1 = nList2.item(temp1);
//System.out.println("\nCurrent Element Internal :"+ nNode1.getNodeName());
if (nNode1.getNodeType() == Node.ELEMENT_NODE) {
Element eElement1 = (Element) nNode1;
if(eElement1.getAttribute("name").equalsIgnoreCase("CID"))
{
cidvalue=eElement1.getTextContent();
}
if(eElement1.getAttribute("name").equalsIgnoreCase("parentCID") && (eElement1.getTextContent().equalsIgnoreCase("NULL")))
{
// System.out.println(eElement1.getTextContent());
System.out.println("row["+temp+"] where parentCID is NULL and corresponding CID value :: "+cidvalue);
cidvalue=null;
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}

Method getTagValue() is undefined in JAVA

I'm new to Java. I saw many example about reading XML and when I tried to copy to my code I got an error that getTagValue is undefined.
I'm using Eclipse, JRE 1.6.
As well as I understand that method (getTagValue) is exist?
This is the errors:
Exception in thread "main" java.lang.Error: Unresolved compilation problems:
The method getTagValue(String, Element) is undefined for the type WriteXMLFile
The method getTagValue(String, Element) is undefined for the type WriteXMLFile
The method getTagValue(String, Element) is undefined for the type WriteXMLFile
The method getTagValue(String, Element) is undefined for the type WriteXMLFile
this the code:
import java.io.File;
import java.io.ObjectInputStream.GetField;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
public class WriteXMLFile
{
public static void main(String argv[])
{
try {
DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
// root elements
Document doc = docBuilder.newDocument();
Element rootElement = doc.createElement("company");
doc.appendChild(rootElement);
// staff elements
Element staff = doc.createElement("Staff");
rootElement.appendChild(staff);
// set attribute to staff element
Attr attr = doc.createAttribute("id");
attr.setValue("1");
staff.setAttributeNode(attr);
// shorten way
// staff.setAttribute("id", "1");
// firstname elements
Element firstname = doc.createElement("firstname");
firstname.appendChild(doc.createTextNode("yong"));
staff.appendChild(firstname);
// lastname elements
Element lastname = doc.createElement("lastname");
lastname.appendChild(doc.createTextNode("mook kim"));
staff.appendChild(lastname);
// nickname elements
Element nickname = doc.createElement("nickname");
nickname.appendChild(doc.createTextNode("mkyong"));
staff.appendChild(nickname);
// salary elements
Element salary = doc.createElement("salary");
salary.appendChild(doc.createTextNode("100000"));
staff.appendChild(salary);
// write the content into xml file
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
DOMSource source = new DOMSource(doc);
StreamResult result = new StreamResult(new File("file.xml"));
// Output to console for testing
// StreamResult result = new StreamResult(System.out);
transformer.transform(source, result);
System.out.println("File saved!");
}
catch (ParserConfigurationException pce)
{
pce.printStackTrace();
}
catch (TransformerException tfe)
{
tfe.printStackTrace();
}
///// read
try {
File fXmlFile = new File("c:\\file.xml");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(fXmlFile);
doc.getDocumentElement().normalize();
System.out.println("Root element :" + doc.getDocumentElement().getNodeName());
NodeList nList = doc.getElementsByTagName("staff");
System.out.println("-----------------------");
for (int temp = 0; temp < nList.getLength(); temp++) {
Node nNode = nList.item(temp);
if (nNode.getNodeType() == Node.ELEMENT_NODE) {
Element eElement = (Element) nNode;
System.out.println("First Name : " + getTagValue("firstname", eElement));
System.out.println("Last Name : " + getTagValue("lastname", eElement));
System.out.println("Nick Name : " + getTagValue("nickname", eElement));
System.out.println("Salary : " + getTagValue("salary", eElement));
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}

This method needs to be included in your class file somewhere
private String getTagValue(String sTag, Element eElement) {
NodeList nlList = eElement.getElementsByTagName(sTag).item(0)
.getChildNodes();
Node nValue = (Node) nlList.item(0);
return nValue.getNodeValue();
}

How to embed xml file into java package and access it?

I have a XML file with data that is used in both my C# and Java version of a library.
Ideally I want to embed this XML file in a package in that library.
I only need to access it from within my library, so I was wondering: is that possible?

In Java, you could include the XML file itself in the JAR file. You can then use something like this:
InputStream istream = getClass().getResourceAsStream("/resource/path/to/some.xml");
And parse your InputStream as normal.
The above getResourceAsStream() looks in the current classpath, which would include the contents of any JAR files.

book.xml
<book>
<person>
<first>Kiran</first>
<last>Pai</last>
<age>22</age>
</person>
<person>
<first>Bill</first>
<last>Gates</last>
<age>46</age>
</person>
<person>
<first>Steve</first>
<last>Jobs</last>
<age>40</age>
</person>
<person>
<first>kunal</first>
<last>kumar</last>
<age>25</age>
</person>
</book>
create a xml file book.xml
made a jar file book.xml.jar and
palce it in war/web-inf/lib folder of your project..
then it will work..
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import javax.servlet.http.*;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
#SuppressWarnings("serial")
public class XMLParser extends HttpServlet {
InputStream istream =getClass().getResourceAsStream("/book.xml");
public void doGet(HttpServletRequest req, HttpServletResponse resp)throws IOException
{
DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = null;
try {
docBuilder = docBuilderFactory.newDocumentBuilder();
} catch (ParserConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Document doc = null;
try {
doc = docBuilder.parse (istream);
} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// normalize text representation
doc.getDocumentElement ().normalize ();
System.out.println ("Root element of the doc is " +
doc.getDocumentElement().getNodeName());
NodeList listOfPersons = doc.getElementsByTagName("person");
int totalPersons = listOfPersons.getLength();
System.out.println("Total no of people : " + totalPersons);
for(int s=0; s<listOfPersons.getLength() ; s++){
Node firstPersonNode = listOfPersons.item(s);
if(firstPersonNode.getNodeType() == Node.ELEMENT_NODE){
Element firstPersonElement = (Element)firstPersonNode;
//-------
NodeList firstNameList = firstPersonElement.getElementsByTagName("first");
Element firstNameElement = (Element)firstNameList.item(0);
NodeList textFNList = firstNameElement.getChildNodes();
System.out.println("First Name : " +
((Node)textFNList.item(0)).getNodeValue().trim());
//-------
NodeList lastNameList = firstPersonElement.getElementsByTagName("last");
Element lastNameElement = (Element)lastNameList.item(0);
NodeList textLNList = lastNameElement.getChildNodes();
System.out.println("Last Name : " +
((Node)textLNList.item(0)).getNodeValue().trim());
//----
NodeList ageList = firstPersonElement.getElementsByTagName("age");
Element ageElement = (Element)ageList.item(0);
NodeList textAgeList = ageElement.getChildNodes();
System.out.println("Age : " +
((Node)textAgeList.item(0)).getNodeValue().trim());
//------
}//end of if clause
}//end of for loop with s var
//System.exit (0);
}//end of main
}