Read XML using Java

Hi All,

Good Morning, I have been working as a Manual Test engineer for last 4 years. Now i started learning java for automating some of the functionaries. And here goes my requirements.

Read huge complex xml and compare values with DB2 database and generate a report. So First of all i need to read xml using java . i did good research in google and came to know that there are many ways to read using different API like SAX, DOM , XOM Jar, XML Beans Jar and so on...

So i request you all to suggest best way to read XML ie SAX or Dom ? if possible sample code also.

WebTester.

View Answers

April 30, 2012 at 1:57 PM

import java.io.*;
import java.util.*;
import org.w3c.dom.*;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

public class ParseXmlFile{

 public static void main(String argv[]){
 ArrayList<Student> list=new ArrayList<Student>();
  try{
  File file = new File("c:\\file.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 node = document.getElementsByTagName("student");
  System.out.println("Information of the students");

  for(int i = 0; i < node.getLength(); i++){
  Node firstNode = node.item(i);
  if(firstNode.getNodeType()== Node.ELEMENT_NODE){
  Element element = (Element) firstNode;
  NodeList firstNameElemntList = element.getElementsByTagName("name");
  Element firstNameElement = (Element) firstNameElemntList.item(0);
  NodeList firstName = firstNameElement.getChildNodes();
  Node n1=firstName.item(0);
  String name=n1.getNodeValue();

  NodeList lastNameElementList = element.getElementsByTagName("address");
  Element lastNameElement = (Element)lastNameElementList.item(0);
  NodeList lastName = lastNameElement.getChildNodes();
  Node n2=lastName.item(0);
  String address=n2.getNodeValue();
  list.add(new Student(name,address));
  }
  }
  for(Student st:list){
  System.out.println(st.getName()+"\t"+st.getAddress());
  }
  }
  catch (Exception e) {
  e.printStackTrace();
  }
 }
}

April 30, 2012 at 1:58 PM

Parse XML using JDOM

import java.io.*;
import org.jdom.*;
import java.util.*;
import org.jdom.input.SAXBuilder;

public class ReadXMLUsingJDOM {
  public static void main(String[] args) {
      SAXBuilder builder = new SAXBuilder();
      File xmlFile = new File("c:\\student.xml");

      try {

        Document document = (Document) builder.build(xmlFile);
        Element rootNode = document.getRootElement();
        List list = rootNode.getChildren("class");

        for (int i = 0; i < list.size(); i++) {

           Element node = (Element) list.get(i);
           String classid = node.getAttribute("id").getValue();
           String name = node.getChildText("Name");
           System.out.println("Class ID: "+classid);
           System.out.println("Name: "+name);

           List list1 = node.getChildren("Student");
            for (int j = 0; j < list1.size(); j++) {
            Element node1 = (Element) list1.get(j);
            String sid = node1.getAttribute("id").getValue();
            String sname = node1.getChildText("Name");
            System.out.println("Student ID: "+sid);
            System.out.println("Student Name: "+sname);
            List list2 = node1.getChildren("Address");
            for (int k = 0; k < list2.size(); k++) {
               Element node2 = (Element) list2.get(k);
               String saddress = node2.getChildText("id");
               System.out.println("Address: "+saddress);
               }
            }
         }
      }
    catch(Exception e){
      System.out.println("Execption " + e.getMessage());
    }
  }
}

April 30, 2012 at 2:00 PM

Please visit the following links:

http://www.roseindia.net/xml/sax/EmployeeDetails.shtml

http://www.roseindia.net/java/example/java/xmlParsing/java-xml-parsing-using-sax.shtml

http://www.roseindia.net/xml/sax/EmployeeDetails.shtml

May 1, 2012 at 11:36 AM

Thanks a lot for the quick reply.

From above two codes i think reading xml using JDOM is simple. But my XML size ranges from 30 MB to 60 MB. Will JDOM handle such huge load ?

Thanks in advance

May 1, 2012 at 8:33 PM

Finally i decided to use JDOM . i am using following xml <Root> <Maste-item-detail coder="afrffica"> Name1 description description2

<Maste-item-detail coder="afrffica"> name2 description description2 <Maste-item-detail coder="afrffica"> name3 description description2

And my java code is here SAXBuilder builder = new SAXBuilder(); File xmlFile = new File("H:\sample1.xml");

  try {
    Document document = (Document) builder.build(xmlFile);

    Element rootNode = document.getRootElement();
    System.out.println ("Root element of the doc is " + rootNode.getName());
    List MasterItemlist = rootNode.getChildren("Maste-item-detail");

    System.out.println("Total Single Items : " + MasterItemlist.size());
    for (int i = 0; i < MasterItemlist.size(); i++) {

       Element node = (Element) MasterItemlist.get(i);
       Element innernode = (Element) node.getChildren("content");
       List name = innernode.getChildren("name");
       System.out.println("First Name : " + innernode.getChildText("name"));

    }

and i am getting following error Exception in thread "main" java.lang.ClassCastException: org.jdom.ContentList$FilterList cannot be cast to org.jdom.Element at ReadXMLFile.main(ReadXMLFile.java:28) Root element of the doc is Root Total Single Items : 3

please help me to get it right

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