CODEWITHSUNDEEP
javaxmlxml-parsing
Patan
Patan

Reputation: 17893

How to get values of all elements from XML string in Java?

I have the a string in XML format. I want to read it and get the values of the elements.

I have tried Java JAXBContext unmarshell, but this needs creation of class which is not necessary for me.

String:

<customer>
    <age>35</age>
    <name>aaa</name>
</customer>

I want to get the values of age and name.

Upvotes: 17

Views: 104017

Answers (6)

Termininja
Termininja

Reputation: 7036

I iterate over all elements with this generic method:

public static void getElementValues(Node node) {
    NodeList nodeList = node.getChildNodes();
    for (int i = 0, len = nodeList.getLength(); i < len; i++) {
        Node currentNode = nodeList.item(i);
        if (len == 1 && currentNode.getNodeType() == Node.TEXT_NODE) {
            System.out.println(node.getLocalName() + "=" + currentNode.getTextContent());
        }
        else if (currentNode.getNodeType() == Node.ELEMENT_NODE) {
            getElementValues(currentNode);
        }
    }
}

Result:

age = 35
name = aaa

Upvotes: 0

kgui
kgui

Reputation: 4163

Just as a tidbit for users with more COMPLICATED XMLs, as I do. If you have elements with the same name but, different attributes, for example:

<field tag="8"> Country </field>
<field tag="12"> State </field>

The way to extract them is to follow @vault's answer but, make sure to change the value in the .item(int) function.

If you want the first field you use .item(0). If you want the second you use .item(1)

Hope this helps for future users as it did for me.

Upvotes: 1

McDowell
McDowell

Reputation: 108969

Using XPath in the standard API:

String xml = "<customer>" + "<age>35</age>" + "<name>aaa</name>"
    + "</customer>";
InputSource source = new InputSource(new StringReader(xml));
XPath xpath = XPathFactory.newInstance()
                          .newXPath();
Object customer = xpath.evaluate("/customer", source, XPathConstants.NODE);
String age = xpath.evaluate("age", customer);
String name = xpath.evaluate("name", customer);
System.out.println(age + " " + name);

Upvotes: 7

vault
vault

Reputation: 4087

This is your xml:

String xml = "<customer><age>35</age><name>aaa</name></customer>";

And this is the parser:

DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
InputSource src = new InputSource();
src.setCharacterStream(new StringReader(xml));

Document doc = builder.parse(src);
String age = doc.getElementsByTagName("age").item(0).getTextContent();
String name = doc.getElementsByTagName("name").item(0).getTextContent();

Upvotes: 54

Grooveek
Grooveek

Reputation: 10094

JSoup has a nice support for XML

import org.jsoup.*     
import org.jsoup.nodes.*   
import  org.jsoup.parser.*

//str is the xml string 
String str = "<customer><age>35</age><name>aaa</name></customer>"
Document doc = Jsoup.parse(str, "", Parser.xmlParser());
System.out.println(doc.select("age").text())

Upvotes: 11

asgoth
asgoth

Reputation: 35829

JDOM is quite easy to use:

SAXBuilder builder = new SAXBuilder();
File xmlFile = new File("c:\\file.xml");
Document document = (Document) builder.build(xmlFile);
Element rootNode = document.getRootElement();
List list = rootNode.getChildren("customer");

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

    Element node = (Element) list.get(i);

    System.out.println("Age : " + node.getChildText("age"));
    System.out.println("Name : " + node.getChildText("name"));         
}

Upvotes: 2

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