Parse nested XML using SAXParser in java

Question

I need to parse a nested XML using SAX Parser.

<ParentNode  id="3" name="3" >
    <ChildNode>
        <InnerNode id="13" name="13"   parentID="3" />
    </ChildNode>
    <ChildNode>
        <ParentNode id="2" name="2" >
            <ChildNode>
                <ParentNode id="1" name="1" >
                    <ChildNode>
                        <InnerNode id="11" name="11"   parentID="1" />
                    </ChildNode>
                    <ChildNode>
                        <InnerNode id="10" name="10"   parentID="1" />
                    </ChildNode>
                </ParentNode>
            </ChildNode>
            <ChildNode>
                <InnerNode id="12" name="12"   parentID="2" />
            </ChildNode>
        </ParentNode>
    </ChildNode>
</ParentNode>

ParentNode tag is the main tag here. ParentNode can also be inside the ChildNode tag. Here onyToMany relationship between ParentNode and ChildNode. and oneToOne relationship between ChildNode and InnerNode in hibernate domains.

This is not static XML. It can be more nested.

see Java SAX Parsing.

Nathan Hughes
– Nathan Hughes

2016-07-15 16:24:10 +00:00
Commented Jul 15, 2016 at 16:24 — Nathan Hughes
– Nathan Hughes, Commented Jul 15, 2016 at 16:24

Al Stead · Accepted Answer · 2016-07-15 16:09:08Z

2

A design pattern to consider if you are wanting to use the SAX parser is defining a stack of the objects (e.g. Stack objectStack = new Stack()). Push the corresponding object onto the stack in startElement. Pop the object off the stack in endElement. Peek at the top of the stack when you want to know the containing (parent) object. (e.g. in startElement, if you peek at the top of the stack and there is an object there, it is the parent of the object defined by the current element.)

answered Jul 15, 2016 at 16:09

Al Stead

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2 Comments

YakovL Over a year ago

Probably a very basic proof-of-concept piece of code would make you answer much more helpful. Just a friendly suggestion.

Nathan Hughes Over a year ago

for an implementation of this, see the JavaWorld series starting with Mapping XML to Java

TheWhiteRabbit · Accepted Answer · 2013-02-08 11:01:56Z

0

This should help

public static void main(String argv[]) {

    try {

    SAXParserFactory factory = SAXParserFactory.newInstance();
    SAXParser saxParser = factory.newSAXParser();

    DefaultHandler handler = new DefaultHandler() {

    boolean bfname = false;
    boolean blname = false;
    boolean bnname = false;
    boolean bsalary = false;

    public void startElement(String uri, String localName,String qName, 
                Attributes attributes) throws SAXException {

        System.out.println("Start Element :" + qName);



    }

    public void endElement(String uri, String localName,
        String qName) throws SAXException {

        System.out.println("End Element :" + qName);

    }

 saxParser.parse("yourfile.xml", handler);

     } catch (Exception e) {
       e.printStackTrace();
     }

   }

answered Feb 8, 2013 at 11:01

TheWhiteRabbit

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5 Comments

Rahul Jain Over a year ago

I am already using SAXParser using above technique but I need to save objects within objects. means ParentNode class objects should conatins the list of ChildNode and ChildNode object should contains the InnerNode object. At last when outer ParentNode object will be ready that time it will be saved in the database containing all information about inner objects.

TheWhiteRabbit Over a year ago

jaxb is best suited for you than serial parsing

Rahul Jain Over a year ago

Now I am using JAXB and getting object of ParentNode that conatins all information about its child but i am now not able to save this object via hibernate. it's giving error :- com.microsoft.sqlserver.jdbc.SQLServerException: The UPDATE statement conflicted with the FOREIGN KEY constraint "FKAF2F9C9B7BD425D8". The conflict occurred in database "chart", table "dbo.ParentNode", column 'id'.

TheWhiteRabbit Over a year ago

thats not related to jaxb, probably something to do with jdbc code

Rahul Jain Over a year ago

Problem resolved, I have used JAXB to parse this complex data.

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