I have a function that takes in kafka ConsumerRecords<Object, Object> records and what I need to do is make an Element object out of each record.
Below is how it works for the Json implementation where I create a JsonNode object for each record.
for (ConsumerRecord<Object, Object> record: records) {
KafkaMessage kafkaMsgVal = (KafkaMessage) record.value();
String rawJson = kafkaMsgVal.getMsgValue();
JsonNode jsonNode = null;
try {
JsonFactory factory = new JsonFactory();
ObjectMapper mapper = new ObjectMapper(factory);
jsonNode = mapper.readTree(rawJson);
}
}
I would like to do the same thing as above but for XML. So instead of JsonNode, I believe I have to use Element, or Document and then use the document.getRootElement(). What is the best way to do this? As you can see above, I was able to simply use JsonFactory and Object mapper to convert the record into a JsonNode, what would be the equivalent for XML?
Below is the idea for what I'm going for:
for (ConsumerRecord<Object, Object> record: records) {
KafkaMessage kafkaMsgVal = (KafkaMessage) record.value();
String rawXml = kafkaMsgVal.getMsgValue();
Element element = null;
try {
//What to do here to convert the rawXml into an Element or Document object?
}
}
You can use XmlMapper
pretty much the same way you have been using `ObjectMapper. Here is a sample code that I tested with:
public static void main(String[] args) {
XmlMapper xmlMapper = new XmlMapper();
String myXML = "<cookies>" +
"<cookie><type>Chocolate</type><price>5.0</price></cookie> " +
"<cookie><type>Sugar</type><price>5.0</price></cookie>" +
"</cookies>";
try {
// Note that the readTree method returns a `JsonNode` result
JsonNode root = xmlMapper.readTree(myXML);
System.out.println(root);
} catch (IOException e) {
e.printStackTrace();
}
}
This produces the below output:
{"cookie":[{"type":"Chocolate","price":"5.0"},{"type":"Sugar","price":"5.0"}]}
EDIT: Adding the Maven co-ordinates for the dependency that I used, just in case
<dependency>
<groupId>com.fasterxml.jackson.dataformat</groupId>
<artifactId>jackson-dataformat-xml</artifactId>
<version>2.14.1</version>
</dependency>
To get a 'Document' from the string you can do something like this:
...
StringReader strReader = new StringReader(myXML);
InputSource inSource = new InputSource(strReader);
// Get a DocumentBuilder instance
DocumentBuilder docBuilder =
DocumentBuilderFactory.newInstance().newDocumentBuilder();
// Parse String to Document
Document doc = docBuilder.parse(inSource);
// Printing the 'document' element name
System.out.println(doc.getDocumentElement().getTagName());
...
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