CODEWITHSUNDEEP
javaxmlxml-parsing
mosawi
mosawi

Reputation: 1323

How to get Key value pair from XML document Java

I have an XML document from which I would like to retrieve the key and value from this XML document. However I am have trouble getting both, I realize I should use the data type of Map but I am unsure how to accomplish this.

Example:

I have the following XML file:

<?xml version="1.0"?>
    <config>
        <Request name="ValidateEmailRequest">
            <requestqueue>emailrequest</requestqueue>
            <responsequeue>emailresponse</responsequeue>
        </Request>
        <Request name="CleanEmail">
            <requestqueue>Cleanrequest</requestqueue>
            <responsequeue>Cleanresponse</responsequeue>
        </Request>
    </config>

I'd like to write a method which parses this file and returns me a key value pair of the node (key) and value (value) of the XML.

Such as [requestqueue,emailrequest] [responsequeue,emailresponse], etc...

What I currently have:

public Map<String, String> parseXML(File f) throws Exception {

    String xml = FileUtils.readFileToString(f);

    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder builder = factory.newDocumentBuilder();

    Document document = builder.parse(new InputSource(new StringReader(xml)));
    Element rootElement = document.getDocumentElement();

    // I'm stuck...

    return null;
}

Any help or assistance would be much appreciated, thanks.

Edit:

I did some research and I found something that will print me the values but only 1 of the keys "Return"

@Test
public void testConverter() throws Exception {
    String xml = ("xmlDir/request.xml");
    Map<String,String> map = convertNodesFromXml(xml);

    for(Map.Entry<String, String> entry: map.entrySet()) {
        String key = entry.getKey(); 
        String value = entry.getValue();

        logger.debug("Key: "+key+" Value: "+value);
    }

}



public static Map<String, String> convertNodesFromXml(String xml) throws Exception {

    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
    dbf.setNamespaceAware(true);
    DocumentBuilder db = dbf.newDocumentBuilder();
    Document document = db.parse(xml);

    Element doc = document.getDocumentElement();
    logger.debug(doc.getFirstChild());

    return createMap(document.getDocumentElement());
}

public static Map<String, String> createMap(Node node) {
    Map<String, String> map = new HashMap<String, String>();
    NodeList nodeList = node.getChildNodes();
    for (int i = 0; i < nodeList.getLength(); i++) {
        Node currentNode = nodeList.item(i);
        if (currentNode.hasAttributes()) {
            for (int j = 0; j < currentNode.getAttributes().getLength(); j++) {
                Node item = currentNode.getAttributes().item(i);
                map.put(item.getNodeName(), item.getTextContent());
            }
        }
        if (node.getFirstChild() != null && node.getFirstChild().getNodeType() == Node.ELEMENT_NODE) {
            map.putAll(createMap(currentNode));
        } else if (node.getFirstChild().getNodeType() == Node.TEXT_NODE) {
            map.put(node.getLocalName(), node.getTextContent());
        }
    }
    return map;
}

Output:

2015-08-18 15:01:31,651 : Key: Return Value: 



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  555-11-2222

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  1632


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  1970-01-01


  555-11-2222


      CA

Upvotes: 2

Views: 9199

Answers (2)

stuparm
stuparm

Reputation: 553

Have you look at java documentation

First of all I will try with 

NodeList nodeList = rootElement.getElementsByTagName("equestqueue");

And later I will iterate through this List (also look at the api) and find attributes, values etc...

Upvotes: 0

pernpas
pernpas

Reputation: 199

The function getChildNodes() https://docs.oracle.com/javase/7/docs/api/org/w3c/dom/Node.html#getChildNodes() returns a nodelist which contains the children of this node. Maybe you make use of that function to walk through your nodetree. Alternatively you can use a frameworks like Jaxb which maps your xml into Java Pojos. With that pojos you can build your map

Upvotes: 0

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