The DIGESTER framework's analysis and conversion method of XML files
The DIGESTER framework is a Java library for parsing and converting XML files.It can convert XML data to Java objects and provide a series of methods to process the structure and content of the XML file.This article will introduce the basic usage of the DIGESTER framework and how to analyze and convert XML files, including how to configure the Digester parser and how to define the rules to map the XML element to the Java object.
The use of the DIGESTER framework is as follows:
1. Configure the DIGESTER parser:
First, we need to create a DIGESTER object and configure its parser.You can configure it in the following way:
Digester digester = new Digester();
digester.setValidating(false);
In the above example, we turn off the verification function to skip DTD or XML SCHEMA verification when parsing XML.
2. Definition rules:
Next, we need to define the rule set applied to the XML file.The rule is used to map the XML element to the field or method of the Java object.You can use the following methods to define rules:
digester.addObjectCreate("root/element", MyObject.class);
digester.addSetProperties("root/element");
digester.addBeanPropertySetter("root/element/property");
In the above example, we define a series of rules to map the `root/element` elements in XML to the` MyObject` class, and set its attributes to the value of the attribute to the `root/element/processy`.
3. Analysis and conversion XML file:
Once the Digester parser and rules are configured, we can use the following code analysis and conversion XML file:
MyObject myObject = (MyObject) digester.parse(new File("data.xml"));
In the above example, we parsed the `data.xml` file as an` myObject` object and assigned it to the `myObject` variable.
Through the above steps, we can easily resolve and convert XML files into Java objects with the DIGESTER framework.
Below is a complete example, demonstrating how to use the DIGESTER framework to analyze and convey the XML file:
import org.apache.commons.digester3.Digester;
import java.io.File;
public class XMLParser {
public static void main(String[] args) {
try {
// Create the DIGESTER object and configure the parser
Digester digester = new Digester();
digester.setValidating(false);
// Definition rules
digester.addObjectCreate("root/element", MyObject.class);
digester.addSetProperties("root/element");
digester.addBeanPropertySetter("root/element/property");
// Analysis and conversion XML file
MyObject myObject = (MyObject) digester.parse(new File("data.xml"));
// Print the Resolution Result
System.out.println(myObject.toString());
} catch (Exception e) {
e.printStackTrace();
}
}
public static class MyObject {
private String property;
public void setProperty(String property) {
this.property = property;
}
public String toString() {
return "MyObject [property=" + property + "]";
}
}
}
In the above code, we created a `MyObject` class, defining a` Property` attribute.We then use the Digester framework to analyze the XML file as the object and print the analysis results.
By understanding the basic usage and example code of the Digester framework, we can easily analyze and convert XML files and map it into the Java object.
