I am struggling to get the data out of the following XML node. I use DocumentBuilder to parse XML and I usually get the value of a node by defining the node but in this case I am not sure how the node would be.
<Session.openRs status="success" sessionID="19217B84:AA3649FE:B211FF37:E61A78F1:7A35D91D:48E90C41" roleBasedSecurity="1" entityID="1" />
This is how I am getting the values for other tags by the tag name.
public List<NYProgramTO> getNYPPAData() throws Exception {
this.getConfiguration();
List<NYProgramTO> to = dao.getLatestNYData();
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
Document document = null;
// Returns chunkSize
/*List<NYProgramTO> myList = getNextChunk(to);
ExecutorService executor = Executors.newFixedThreadPool(myList.size());
myList.stream().parallel()
.forEach((NYProgramTO nyTo) ->
{
executor.execute(new NYExecutorThread(nyTo, migrationConfig , appContext, dao));
});
executor.shutdown();
executor.awaitTermination(300, TimeUnit.SECONDS);
System.gc();*/
try {
DocumentBuilder builder = factory.newDocumentBuilder();
InputSource source = new InputSource();
for(NYProgramTO nyProgram: to) {
String reqXML = nyProgram.getRequestXML();
String response = RatingRequestProcessor.postRequestToDC(reqXML, URL);
// dao.storeData(nyProgram);
System.out.println(response);
if(response != null) {
source.setCharacterStream(new StringReader(response));
document = builder.parse(source);
NodeList list = document.getElementsByTagName(NYPG3Constants.SERVER);
for(int iterate = 0; iterate < list.getLength(); iterate++){
Node node = list.item(iterate);
if(node.getNodeType() == Node.ELEMENT_NODE) {
Element element = (Element) node;
nyProgram.setResponseXML(response);
nyProgram.setFirstName(element.getElementsByTagName(NYPG3Constants.F_NAME).item(0).getTextContent());
nyProgram.setLastName(element.getElementsByTagName(NYPG3Constants.L_NAME).item(0).getTextContent());
nyProgram.setPolicyNumber(element.getElementsByTagName(NYPG3Constants.P_NUMBER).item(0).getTextContent());
nyProgram.setZipCode(element.getElementsByTagName(NYPG3Constants.Z_CODE).item(0).getTextContent());
nyProgram.setDateOfBirth(element.getElementsByTagName(NYPG3Constants.DOB).item(0).getTextContent());
nyProgram.setAgencyCode(element.getElementsByTagName(NYPG3Constants.AGENCY_CODE).item(0).getTextContent());
nyProgram.setLob(element.getElementsByTagName(NYPG3Constants.LINE_OF_BUSINESS).item(0).getTextContent());
if(element.getElementsByTagName(NYPG3Constants.SUBMISSION_NUMBER).item(0) != null){
nyProgram.setSubmissionNumber(element.getElementsByTagName(NYPG3Constants.SUBMISSION_NUMBER).item(0).getTextContent());
} else {
nyProgram.setSubmissionNumber("null");
}
I need to get the value for sessionId. What I want to know is the node, I am sure it can't be .I am retrieving the values via tag names so what would be the tag name in this case?
Thanks in advance
You should consider using XPath. At least for me, is so much easy to use and, in your case, in order to get sessionID you could try something like this:
XPath xPath = XPathFactory.newInstance().newXPath();
String expression = "/Session.openRs/#sessionID";
String sessionID = xPath.evaluate(expression,document);
You can obtain 'document' like this:
Document document = builder.newDocumentBuilder();
Hope this can help!!
I'm trying to read the value of "release" tag of a remote XML file and return it's value .I'm able to find the value of "release" tag using getElementText() but not by getElementValue()
Java Code..
try {
URL url1 = new URL("http://hsv-artifactory.emrsn.org:8081/artifactory/libs-release-local/com/avocent/commonplatform/cps/symbols/gdd/GDDResources/maven-metadata.xml");
XMLStreamReader reader1 = XMLInputFactory.newInstance().createXMLStreamReader(url1.openStream());
String Latest = null;
while (reader1.hasNext()) {
if (reader1.next() == XMLStreamConstants.START_ELEMENT) {
if (reader1.getLocalName().equals("release")) {
Latest = reader1.getElementText();
break;
}
}
}
System.out.println("Latest version in Artifactory is :"+Latest);
} catch (IOException ex) {
// handle exception
Logger.getLogger(SVNRepoConnector1.class.getName()).log(Level.SEVERE, null, ex);
} catch (XMLStreamException ex) {
// handle exception
Logger.getLogger(SVNRepoConnector1.class.getName()).log(Level.SEVERE, null, ex);
} finally {
// close the stream
}
In the above code the value is being stored in a String variable but i want to store it in an integer variable so that i can perform operations like addition,subtraction on it afterwards..Please Help
DOM Solution:
URL url1 = new URL("http://hsv-artifactory.emrsn.org:8081/artifactory/libs-release-local/com/avocent/commonplatform/cps/symbols/gdd/GDDResources/maven-metadata.xml");
InputSource xmlInputSource = new InputSource(url1.openStream());
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document dom = dBuilder.parse(xmlInputSource);
XPathFactory xPathfactory = XPathFactory.newInstance();
XPath xpath = xPathfactory.newXPath();
XPathExpression expr = xpath.compile("//release");//all release elements
NodeList nodes = (NodeList) expr.evaluate(e,XPathConstants.NODESET);
ArrayList<Integer> releaseList = new ArrayList<Integer>();
for (int i = 0; i < nodes.getLength(); i++) {
Element releaseElem = (Element) nodes.item(i);
releaseList.add(Integer.parseInt(releaseElem.getText()));
}
Just catch the exceptions.
I am parsing an XML document and I need to put every child in to a List and then once it is in a List I need to be able to grab a specific child node from an index in the List. My code so far only grabs every child node but I don't know how to put it in a List, looping through it doesn't seem to work. Here is what I have so far:
public static void main(String[] args){
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
try {
URL url = new URL ("http://feeds.cdnak.neulion.com/fs/nhl/mobile/feeds/data/20140401.xml");
URLConnection connection = url.openConnection();
InputStream is = connection.getInputStream();
// use the factory to create a documentbuilder
DocumentBuilder builder = factory.newDocumentBuilder();
// create a new document from input stream
Document doc = builder.parse(is); // get the first element
Element element = doc.getDocumentElement();
System.out.println(element);
// get all child nodes
NodeList nodes = element.getChildNodes();
// print the text content of each child
for (int i = 0; i < nodes.getLength(); i++) {
System.out.println("" + nodes.item(i).getTextContent());
} } catch (Exception ex) {
ex.printStackTrace();
}
}
Here's some basic xml doc:
<h1>My Heading</h1>
<p align = "center"> My paragraph
<img src="smiley.gif" alt="Smiley face" height="42" width="42"></img>
<img src="sad.gif" alt="Sad face" height="45" width="45"></img>
<img src="funny.gif" alt="Funny face" height="48" width="48"></img>
</p>
<p>My para</p>
What am i trying to do is find element, all his attributes and save attribute name + attribute value for each element. Here's my code so far:
private Map <String, String> tag = new HashMap <String,String> ();
public Map <String, String> findElement () {
try {
FileReader fRead = new FileReader (sourcePage);
BufferedReader bRead = new BufferedReader (fRead);
DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance ();
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder ();
Document doc = docBuilder.parse(new FileInputStream (new File (sourcePage)));
XPathFactory xFactory = XPathFactory.newInstance ();
XPath xPath = xFactory.newXPath ();
NodeList nl = (NodeList) xPath.evaluate("//img/#*", doc, XPathConstants.NODESET);
for( int i=0; i<nl.getLength (); i++) {
Attr attr = (Attr) nl.item(i);
String name = attr.getName();
String value = attr.getValue();
tag.put (name,value);
}
bRead.close ();
fRead.close ();
}
catch (Exception e) {
e.printStackTrace();
System.err.println ("An error has occured.");
}
Problem appears when i am looking for img's attributes, because of identical attributes. HashMap is not suitable for this, for its overwriting of values with the same key. Maybe i'm using wrong expression to find all attributes. Is there any other way, how to get attributes names and values of nth img element?
First, let's level the field a little. I cleaned up your code a bit to have a compiling starting point. I removed the unnecessary code and fixed the method by my best guess of what it is supposed to do. And I generized it a little to make it accept one tagName parameter. It's still the same code and does the same mistake, but now it compiles (Java 7 features used for convenience, switch it back to Java 6 if you want). I also split the try-catch into multiple blocks just for the sake of it:
public Map<String, String> getElementAttributesByTagName(String tagName) {
Document document;
try (InputStream input = new FileInputStream(sourcePage)) {
DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
document = docBuilder.parse(input);
} catch (IOException | ParserConfigurationException | SAXException e) {
throw new RuntimeException(e);
}
NodeList attributeList;
try {
XPath xPath = XPathFactory.newInstance().newXPath();
attributeList = (NodeList)xPath.evaluate("//descendant::" + tagName + "[1]/#*", document, XPathConstants.NODESET);
} catch (XPathExpressionException e) {
throw new RuntimeException(e);
}
Map<String, String> tagInfo = new HashMap<>();
for (int i = 0; i < attributeList.getLength(); i++) {
Attr attribute = (Attr)attributeList.item(i);
tagInfo.put(attribute.getName(), attribute.getValue());
}
return tagInfo;
}
When run against your example code above, it returns:
{height=48, alt=Funny face, width=48, src=funny.gif}
The solution depends on what is your expected output. You either want
To get the attributes of only one of the <img> elements (say, the first one)
To get a list of all <img> elements and their attributes
For the first solution, it's enough to change your XPath expression to
//descendant::img[1]/#*
or
//descendant::" + tagName + "[1]/#*
with the tagName parameter. Beware, that this is not the same as //img[1]/#* even though it returns the same element in this particular case.
When changed this way, the method returns:
{height=42, alt=Smiley face, width=42, src=smiley.gif}
which are correctly returned attributes of the first <img> element.
Note that you don't even have to use XPath expression for this kind of work. Here's a non-XPath version:
public Map<String, String> getElementAttributesByTagNameNoXPath(String tagName) {
Document document;
try (InputStream input = new FileInputStream(sourcePage)) {
DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
document = docBuilder.parse(input);
} catch (IOException | ParserConfigurationException | SAXException e) {
throw new RuntimeException(e);
}
Node node = document.getElementsByTagName(tagName).item(0);
NamedNodeMap attributeMap = node.getAttributes();
Map<String, String> tagInfo = new HashMap<>();
for (int i = 0; i < attributeMap.getLength(); i++) {
Node attribute = attributeMap.item(i);
tagInfo.put(attribute.getNodeName(), attribute.getNodeValue());
}
return tagInfo;
}
The second solution needs to change things a bit. We want to return the attributes of all <img> elements in the document. Multiple elements means we'll use a List which will hold multiple Map<String, String> instances, where every Map represents one <img> element.
A complete XPath version in case you actually need some complex XPath expression:
public List<Map<String, String>> getElementsAttributesByTagName(String tagName) {
Document document;
try (InputStream input = new FileInputStream(sourcePage)) {
DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
document = docBuilder.parse(input);
} catch (IOException | ParserConfigurationException | SAXException e) {
throw new RuntimeException(e);
}
NodeList nodeList;
try {
XPath xPath = XPathFactory.newInstance().newXPath();
nodeList = (NodeList)xPath.evaluate("//" + tagName, document, XPathConstants.NODESET);
} catch (XPathExpressionException e) {
throw new RuntimeException(e);
}
List<Map<String, String>> tagInfoList = new ArrayList<>();
for (int i = 0; i < nodeList.getLength(); i++) {
Node node = nodeList.item(i);
NamedNodeMap attributeMap = node.getAttributes();
Map<String, String> tagInfo = new HashMap<>();
for (int j = 0; j < attributeMap.getLength(); j++) {
Node attribute = attributeMap.item(j);
tagInfo.put(attribute.getNodeName(), attribute.getNodeValue());
}
tagInfoList.add(tagInfo);
}
return tagInfoList;
}
To get rid of the XPath part, you can simply switch it to a one-liner:
NodeList nodeList = document.getElementsByTagName(tagName);
Both these versions, when run against your test case above with an "img" parameter, return this: (formatted for clarity)
[ {height=42, alt=Smiley face, width=42, src=smiley.gif},
{height=45, alt=Sad face, width=45, src=sad.gif },
{height=48, alt=Funny face, width=48, src=funny.gif } ]
which is a correct list of all the <img> elements.
try using
Map <String, ArrayList<String>> tag = new HashMap <String, ArrayList<String>> ();
You can use a map inside the map:
Map<Map<int, String>, String> // int = "some index" 0,1,etc.. & String1(the value of the second Map) =src & String2(the value of the original Map) =smiley.gif
OR
You can inverse it and consider that when using it, like :
Map<String, String> // String1=key=smiley.gif , String2=value=src
I'm stumped, hopefully I've just done a dumb thing that I can fix easily.
I'm passing in a String full of XML, being 'XMLstring'. I want to get one of the elements and print the child nodes in a "name = value" on the console. The problem is that the console keeps printing garbage along with the element name that I cannot work out how to get rid of.
Anyway, this code:
try {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
InputSource is = new InputSource();
is.setCharacterStream(new StringReader(XMLstring));
Document doc = db.parse(is);
NodeList nodes = doc.getElementsByTagName("client-details");
Node node = nodes.item(0);
NodeList client_details = node.getChildNodes();
for (int i = 0; i < client_details.getLength(); i++) {
System.out.println(client_details.item(i).getNodeName()+" = "+getTextContents(client_details.item(i)));
}
}
catch (Exception e) {
e.printStackTrace();
}
Gives me the following:
#text =
testing-mode = false
#text =
name = testman
#text =
age = 30
Why is it printing the "#text ="? How do I get rid of it?
I am using NetBeans if that helps.
You want to use getNodeValue() instead:
System.out.println(client_details.item(i).getNodeValue()+" = "+getTextContents(client_details.item(i)));
If you look in the table at the top of this page, you see that for Text nodes, getNodeName() returns #text.
I am curious to see what each of the two function calls in your System.out.println() is printing out separately, only because the entire output should be on one line. One of those two is causing the problems, and i believe it may be internal to the function.
Otherwise, if you use String splitString = string.split("[=]"); it will split up the line based on the delimeter '='
then you can
String splitString = string.split("[=]");
System.out.println(splitString[1] + " = " + splitString[2]);
or, much more simply, make that one small edit that #retrodrone posted
OK I managed to resolve this issue, for anyone else who cares. The problem with the code is that the Node needs to be cast to an Element before you can get the tag name out of it in this manner. Therefore:
try {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
InputSource is = new InputSource();
is.setCharacterStream(new StringReader(XMLstring));
Document doc = db.parse(is);
NodeList nodes = doc.getElementsByTagName("client-details");
Node node = nodes.item(0);
NodeList client_details = node.getChildNodes();
Element elementary;
for (int i = 0; i < client_details.getLength(); i++) {
if(client_details.item(i).getNodeType() == Node.ELEMENT_NODE) {
elementary = (Element) client_details.item(i);
System.out.println(elementary.getTagName()+" = "+getTextContents(client_details.item(i)));
}
}
}
Which produces the desired result, minus that "#text" bollocks :)
testing-mode = false
name = testman
age = 30
Notice the new "if" statement I added inside the for loop and the cast of the node to an element before calling getNodeName, which does work for Elements.