JAVA XML child parsing

Question

I have a simple XML

        <task id ="MyMethod">
            <taskParameter>"Redicted"</taskParameter>
            <taskParameter>"ServerInitiated"</taskParameter>
        </task>
        <task id ="NoRedictedMethod">
            <taskParameter>"NoRedicted"</taskParameter>
        </task>

and I want to parse it with Java and I try to print them with the proper nesting

        NodeList ParentList = doc.getElementsByTagName("task");
        for (int i = 0; i < ParentList.getLength(); i++) {
            System.out.println("Parent is "+ ParentList.item(i).getTextContent());

            NodeList childList = ParentList.item(i).getChildNodes();

            for (int j = 0; j < childList.getLength(); j++) {
                System.out.println("Clild is "+ childList.item(j).getTextContent());
            }
        }

my results are not right. What am I doing wrong?

PS. I want to print something like that

    Parent is MyMethod
    Clild is Redicted
    Clild is ServerInitiated
    Parent is NoRedictedMethod
    Clild is NoRedicted

What are you trying to print? How should your desired output look like? — ayip
– ayip, Commented May 21, 2017 at 18:44

ayip · Accepted Answer · 2017-05-21 19:33:40Z

1

What you are calling as parent is an attribute node. So to retrieve that changes your code to:

Edited to avoid whitespace characters while parsing

NodeList ParentList = doc.getElementsByTagName("task");
        for (int i = 0; i < ParentList.getLength(); i++) {
            NamedNodeMap attributes = ParentList.item(i).getAttributes();

            for (int index = 0; index < attributes.getLength(); index++) {
                Node attribute = attributes.item(index);
                System.out.println("Parent is "+ attribute.getNodeValue());
            }

            NodeList childList = ParentList.item(i).getChildNodes();

            for (int j = 0; j < childList.getLength(); j++) {
               String text = childList.item(j).getTextContent();
               if (text.trim().length() != 0) {
                System.out.println("Clild is "+ text);
               }
            }
        }

edited May 21, 2017 at 19:33

answered May 21, 2017 at 18:58

ayip

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2 Comments

Michail N Over a year ago

I found my problem. When it parsed the XML it also parses the blancks so I have chilldren for the first node: "\n\t\t\t", "Redicted", "\n\t\t\t\t" "ServerInitiated", "\n\t\t\t\t" and this is why when I print them they are messed up. What to do in this case?

Michail N Over a year ago

Thanks a lot! I also tried to filter blanks wiht regural expression like: if(!childList.item(j).getTextContent().matches("^\n.*") ) which also works but your solution is way more elegant and generic.

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