Java - parse nested xml file and write to the file

Question

I have a .xml file like below:

    <?xml version="1.0"?>
    <Event>
    <Issue>ggg</Issue>
    <City>Athen</City>   
      <Group>
      <AlternateIdentification>
        <AlternateID>DG800</AlternateID>
        <AlternateIDType>GoA</AlternateIDType>
      </AlternateIdentification>
      <AlternateIdentification>
        <AlternateID>SS500</AlternateID>
        <AlternateIDType>SDD</AlternateIDType>
      </AlternateIdentification>
      <AlternateIdentification>
        <AlternateID>TY158</AlternateID>
        <AlternateIDType>YTU</AlternateIDType>
      </AlternateIdentification>
      </Group>
    </Event>

And I would like to parse .xml file and write the output to the flat .txt file with lines like this:

ggg Athen DG800
ggg Athen SS500
ggg Athen TY158

Can you help me and tell me how to do this with javax DOM parser? I have no idea how to start :( This common part confuses me the most because I need to iterate this file in this case 3 times to get 3x "ggg Athen" and then additional tag AlternateID?

Can you use a more sophisticated XML library such as GSON or Jackson for the task? — Mick Mnemonic
– Mick Mnemonic, Commented Jul 28, 2017 at 22:11
If not, the Java tutorial for XML->DOM is a good starting point. — Mick Mnemonic
– Mick Mnemonic, Commented Jul 28, 2017 at 22:13
But in which file do you want to write the output ? In another file I assume ? — davidxxx
– davidxxx, Commented Jul 28, 2017 at 22:36
@davidxxx yes, the output should be in another flat file - .txt — EdXX
– EdXX, Commented Jul 28, 2017 at 22:42
Try to write code first , then ask questions, there are plenty of tutorial available, refer this - tutorialspoint.com/java_xml/java_dom_parse_document.htm — Derrick
– Derrick, Commented Sep 6, 2017 at 10:28

davidxxx · Accepted Answer · 2017-07-28 21:56:00Z

2

Java - parse nested xml file and write to the file

A simple way :

Read line by line with BufferedReader.readLine() until finding the start of the nested xml part.
For example : <?xml version="1.0"?>
When you identified this line, add each read line in a StringBuilder instance until you encounter the end of the xml part that you want to analyse. For example the end tag of the root element of it.
Here : </Event>
Create a org.w3c.dom.Document from the String contained in the StringBuilder :

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); Document document = builder.parse(new InputSource(new StringReader( stringBuilder.toString())));
Use your preferred way to find data in the document : dom, jdom, xpath, etc...

answered Jul 28, 2017 at 21:56

davidxxx

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2 Comments

EdXX Over a year ago

I don't even understand the first point from your answer :( Read line by line until the start of the nested xml part. For example <?xml version="1.0"?> ?? It's the begining of the xml file not only the nested part

davidxxx Over a year ago

Ah I though that you had nested xml in your xml... It should easier so.

Malakai · Accepted Answer · 2017-07-28 21:43:41Z

0

You definitely need to look at Sax XML Parser. Tutorial for that can be found here

Good luck

answered Jul 28, 2017 at 21:43

Malakai

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1 Comment

EdXX Over a year ago

But how to do this with javax DOM parser??

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