I want to extract out all the <link> tags from this XML tree using java
Question
I have an XML file which has a 3 level deep XML tree. I want to extract all the <link> tags from that tree. The challenge here is that tree is dynamic and can be any level deep.
I have already extracted the root node <helplinks> and I have two methods at my disposal:
-> XmlUtil.getChildNodes(Node node,"name of the child") ~~ returns a list of child nodes from the parent node.
<helplinks message="Check these links out if you are trying to accomplish something like this: \\n">
<category name="Connectivity" value = "1" jsonValue="MEP">
<link name="Reset Password" value="https://www.google.com"></link>
<link name="Rename User" value="https://www.google.com"></link>
<link name="Change Database" value="https://www.google.com"></link>
<subcategory name="Internet" value = "1" jsonValue="MES">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<item name="Not Working" value = "1" jsonValue="MDS">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
<link name="Option 4" value="https://www.google.com"></link>
</item>
<item name="Working Slow" value = "2" jsonValue="MLP">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
<link name="Option 4" value="https://www.google.com"></link>
<link name="Option 5" value="https://www.google.com"></link>
</item>
</subcategory>
<subcategory name="VPN" value = "2" jsonValue="MES">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
<link name="Option 4" value="https://www.google.com"></link>
<link name="Option 5" value="https://www.google.com"></link>
<item name="Not Working" value = "1" jsonValue="MDS">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
</item>
<item name="Working Slow" value = "2" jsonValue="MLP">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
</item>
</subcategory>
</category>
<category name="Desktop/Laptop Issue" value = "2" jsonValue="LPM">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<subcategory name="Machine Down" value = "1" jsonValue="LPN">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
<item name="Power Down" value = "1" jsonValue="LMR">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
<link name="Option 4" value="https://www.google.com"></link>
</item>
<item name="Blank Screen" value = "2" jsonValue="LMV">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
</item>
</subcategory>
<subcategory name="Machine Slow" value = "2" jsonValue="LPO">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
<item name="Laptop" value = "1" jsonValue="LMA">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
</item>
<item name="Desktop" value = "2" jsonValue="LMQ">
<link name="Option 1" value="https://www.google.com"></link>
</item>
</subcategory>
<subcategory name="Need Upgrade" value = "3" jsonValue="LPC">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
<item name="Laptop" value = "1" jsonValue="LMT">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
</item>
<item name="Desktop" value = "2" jsonValue="LMP">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
</item>
</subcategory>
<subcategory name="Hardware Problem" value = "4" jsonValue="LPR">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
<link name="Option 4" value="https://www.google.com"></link>
<link name="Option 5" value="https://www.google.com"></link>
<link name="Option 6" value="https://www.google.com"></link>
<item name="Screen Problem" value = "1" jsonValue="LMW">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
</item>
<item name="HardDisk Problem" value = "2" jsonValue="LMG">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
</item>
<item name="Keyboard Problem" value = "3" jsonValue="LMH">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
</item>
<item name="Others" value = "4" jsonValue="LMI">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
</item>
</subcategory>
</category>
<category name="Business Application Issue" value = "3" jsonValue="ABC">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
<subcategory name="ERP" value = "1" jsonValue="ABC1">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
<link name="Option 4" value="https://www.google.com"></link>
<link name="Option 5" value="https://www.google.com"></link>
<link name="Option 6" value="https://www.google.com"></link>
<item name="Login Issue" value = "1" jsonValue="ABC11">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
<link name="Option 4" value="https://www.google.com"></link>
<link name="Option 5" value="https://www.google.com"></link>
<link name="Option 6" value="https://www.google.com"></link>
</item>
<item name="Workflow Issue" value = "2" jsonValue="ABC12">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
</item>
</subcategory>
<subcategory name="CRM" value = "2" jsonValue="ABC2">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
<item name="Login Issue" value = "1" jsonValue="ABC21">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
<link name="Option 4" value="https://www.google.com"></link>
<link name="Option 5" value="https://www.google.com"></link>
<link name="Option 6" value="https://www.google.com"></link>
</item>
<item name="Workflow Issue" value = "2" jsonValue="ABC22">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
<link name="Option 4" value="https://www.google.com"></link>
<link name="Option 5" value="https://www.google.com"></link>
<link name="Option 6" value="https://www.google.com"></link>
</item>
</subcategory>
<subcategory name="Email" value = "3" jsonValue="ABC3">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
<item name="Send Receive Issue" value = "1" jsonValue="ABC31">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
<link name="Option 4" value="https://www.google.com"></link>
<link name="Option 5" value="https://www.google.com"></link>
<link name="Option 6" value="https://www.google.com"></link>
</item>
<item name="Archive Issue" value = "2" jsonValue="ABC32">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
</item>
<item name="Space issue" value = "3" jsonValue="ABC33">
<link name="Option 1" value="https://www.google.com"></link>
<link name="Option 2" value="https://www.google.com"></link>
<link name="Option 3" value="https://www.google.com"></link>
</item>
</subcategory>
</category>
</helplinks>
To be clearly stated my goal is to extract out all the <link> tags regardless of the nesting.
1 answers
solution1
1 ACCPTED 2020-07-06 10:39:14
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathFactory;
import java.io.File;
import java.util.Map;
public class Test {
public static void main(String[] args) throws Exception {
File file = new File("C:\\Users\\rishabh.awatani\\Downloads\\something.xml");
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
Document document = documentBuilder.parse(file);
XPath xPath = XPathFactory.newInstance().newXPath();
String expression = "//link";
NodeList nodeList = (NodeList) xPath.compile(expression).evaluate(document, XPathConstants.NODESET);
for(int i = 0; i<nodeList.getLength(); i++){
Node node = nodeList.item(i);
NamedNodeMap nodeMap = node.getAttributes();
System.out.println(nodeMap.getNamedItem("name").getNodeValue() + " ----> " + nodeMap.getNamedItem("value").getNodeValue());
}
}
}
This worked for me as Tree structure was none of my concern. Using XPath to find all the <link> tags and then extracting out values of different elements.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.
Related Question
I want to insert subelement to a subelement in xml tree using Java
Need to extract particular tags and their values from a xml using java
How to parse the next xml using XPath in java?I want to extract the cue and the xscope from a sentence?
I want to extract all method names and variable names from a java source file using ANTLR4
Get all the tags and values from XML using SAX parser in java
extract URL location from an xml link in java
Getting all the tags in an XML file using java
Extract all the recurring element of XML using java
want to retrieve values from database for xml tags in java
Extract all HTML tags, including closing tags, from file using Java without using external library like Jsoup
Related Tags