Apache Commons Digester framework technical analysis in the Java class library
Apache Commons Digestter is a Java -based open source framework that is used to process XML data and convert it to Java objects.It provides a simple and powerful way to analyze and map XML documents so that developers can easily process and operate XML data.
The main functions of DIGESTER include:
1. Analyze XML file: Digester can read and analyze XML files. Whether it is local files or remote resources, it can add XML content to memory.
2. Map the XML element to Java object: Digerster can map the XML element to the Java object through configuration rules.Developers can use a series of rules to specify how to analyze XML elements and attributes and map them to fields or methods of Java objects.
The following is an example that demonstrates how to use Digestter to analyze XML data as Java object:
public class Employee {
private String name;
private int age;
// State the getter and setter method
// omit other code
}
public class DigesterExample {
public static void main(String[] args) {
Digester digester = new Digester();
// Configuration rules
digester.addObjectCreate("employees/employee", Employee.class);
digester.addBeanPropertySetter("employees/employee/name", "name");
digester.addBeanPropertySetter("employees/employee/age", "age");
digester.addSetNext("employees/employee", "add");
try {
// Analyze XML file
List<Employee> employees = (List<Employee>) digester.parse(new File("employees.xml"));
// Print results
for (Employee employee : employees) {
System.out.println("Name: " + employee.getName());
System.out.println("Age: " + employee.getAge());
}
} catch (IOException | SAXException e) {
e.printStackTrace();
}
}
}
In the above example, we created an Employee class to represent each employee node in XML.Then, by configuring the Digest rule, we specify how to map the XML element to the Employee object.Finally, we use the DIGESTER PARSE method to analyze the XML file as a list of the Employee object and output the results.
Using Apache Commons Digest, developers can process and operate XML data easier.It provides a flexible configuration option that enables developers to customize and analyze the rules according to their needs.Whether it is a simple XML analysis or complex data mapping, Digester is a good choice.
