Use XML Pull to resolve the steps and examples of the API in the Java library
Use XML Pull to resolve the steps and examples of the API in the Java library
XML PULL parsing API is a method of fast and efficient analysis of XML documents.It provides a set of simple tools and classes for extracting data from XML documents, and processing and operation.
step:
1. Import the required class library and bag.Add under the top of the java file: Import statement:
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;
import java.io.InputStream;
2. Create an XMLPULL parser object.At the beginning of the code, create a XMLPullParserFactory instance and use it to create an XMLPULLPARSER object.
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
XmlPullParser parser = factory.newPullParser();
3. Set input stream.The XML data file is passed to the XML parser as an input.
InputStream inputStream = new FileInputStream("data.xml");
parser.setInput(inputStream, null);
4. Analyze the XML file.Through cycle traversal, the XML file can be read -by -line, and each event is processed as needed.
int eventType = parser.getEventType();
while (eventType != XmlPullParser.END_DOCUMENT) {
switch (eventType) {
case XmlPullParser.START_TAG:
String tagName = parser.getName();
if (tagName.equals("tag1")) {
// Process tag1 Start label
} else if (tagName.equals("tag2")) {
// Process tag2 Start label
}
break;
case XmlPullParser.END_TAG:
String tagName = parser.getName();
if (tagName.equals("tag1")) {
// Treat tag1 to end the label
} else if (tagName.equals("tag2")) {
// Treat tag2 end tags
}
break;
case XmlPullParser.TEXT:
String text = parser.getText();
// Process text content
break;
}
eventType = parser.next();
}
Example:
Suppose we have a XML file called "Students.xml", and the content is as follows:
<students>
<student>
<name> Zhang San </name>
<age>18</age>
</student>
<student>
<name> Li Si </name>
<age>20</age>
</student>
</students>
We can use XML PULL to analyze the API to read and process this XML file.The following is an example of Java code:
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;
import java.io.FileInputStream;
import java.io.IOException;
public class XmlPullParserExample {
public static void main(String[] args) {
try {
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
XmlPullParser parser = factory.newPullParser();
FileInputStream fileInputStream = new FileInputStream("students.xml");
parser.setInput(fileInputStream, null);
int eventType = parser.getEventType();
while (eventType != XmlPullParser.END_DOCUMENT) {
switch (eventType) {
case XmlPullParser.START_TAG:
String tagName = parser.getName();
if (tagName.equalsIgnoreCase("name")) {
System.out.println ("Name:" + Parser.nextText ());
} else if (tagName.equalsIgnoreCase("age")) {
System.out.println ("age:" + Parser.nextText ());
}
break;
}
eventType = parser.next();
}
fileInputStream.close();
} catch (XmlPullParserException | IOException e) {
e.printStackTrace();
}
}
}
Run the above example, the following will output the following:
Name: Zhang San
Age: 18
Name: Li Si
Age: 20
This example shows how to use XML Pull to parse the API to resolve XML files and extract the student's name and age information for processing.You can further expand and process XML data according to your needs.
