How does Java read XML file implementation
- 2020-04-01 02:35:05
- OfStack
Today's CSDN FAQ shows you how to read the contents of an XML file in Java.
Directly on the code, comments written very clearly!
import java.io.*;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
public class XMLReaderTest {
public static void main(String args[]) {
Element element = null;
//Absolute path force can be used
File f = new File("test.xml");
//DocumentBuilder cannot be directly instantiated as an abstraction (converting XML files to DOM files)
DocumentBuilder db = null;
DocumentBuilderFactory dbf = null;
try {
//Returns the documentBuilderFactory object
dbf = DocumentBuilderFactory.newInstance();
//Returns the db object with the documentBuilderFatory object to get the returned documentBuildr object
db = dbf.newDocumentBuilder();
//You get a DOM and return it to the document object
Document dt = db.parse(f);
//Gets an elment root element
element = dt.getDocumentElement();
//Get the root node
System.out.println(" The root element: " + element.getNodeName());
//Gets the child node under the root element
NodeList childNodes = element.getChildNodes();
//Iterate over the child nodes
for (int i = 0; i < childNodes.getLength(); i++) {
//Get the node for each corresponding position I
Node node1 = childNodes.item(i);
if ("Account".equals(node1.getNodeName())) {
//If the name of the node is "Account", the Account element attribute type is output
System.out.println("rn Find an account number . area : " + node1.getAttributes().getNamedItem("type").getNodeValue() + ". ");
//Get <Accounts> The node
NodeList nodeDetail = node1.getChildNodes();
//Traverse <Accounts> The node
for (int j = 0; j < nodeDetail.getLength(); j++) {
//Get <Accounts> Element each node
Node detail = nodeDetail.item(j);
if ("code".equals(detail.getNodeName())) //The output code
System.out.println(" The card number : " + detail.getTextContent());
else if ("pass".equals(detail.getNodeName())) //Output pass
System.out.println(" password : " + detail.getTextContent());
else if ("name".equals(detail.getNodeName())) //Output the name
System.out.println(" The name : " + detail.getTextContent());
else if ("money".equals(detail.getNodeName())) //Output money
System.out.println(" The balance of : " + detail.getTextContent());
}
}
}
}
catch (Exception e) {
e.printStackTrace();
}
}
}
Then the XML file we tested (test.xml) will be placed in the root directory of the project. Its contents are:
<?xml version="1.0" encoding="gbk"?>
<Accounts>
<Account type="type1">
<code>100001</code>
<pass>123</pass>
<name> Li si </name>
<money>1000000.00</money>
</Account>
<Account type="type2">
<code>100002</code>
<pass>123</pass>
<name> Zhang SAN </name>
<money>1000.00</money>
</Account>
</Accounts>
Directly run the code, output:
Root element: Accounts
Found an account. Area: type1.
Card number: 100001
Password: 123
Name: li si
Balance: 1000000.00
Found an account. Area: type2.
Card number: 100002
Password: 123
Name: zhang SAN
Balance: 1000.00