Analysis of the technical principles of the Commons Beanutill framework in the Java class library
The Commons Beanutils framework is an open source Java class library, which aims to simplify the attribute copy between the Java objects and the acquisition and setting of attribute values.The framework provides a powerful and easy -to -use tool that helps developers to quickly operate the Java object.
The technical principles of the Commons Beanutils framework are as follows:
1. Reflex: Commons Beanutils framework uses Java's reflection mechanism to obtain and set the attribute value of the Java object.By reflection, you can dynamically obtain and set the attributes of the object without the need for developers to manually write a large number of Getter and Setter methods.
2. Internal province: Internal province is a mechanism to obtain and set the Java object attributes at runtime.The COMMONS BeANUTILS framework uses internal provinces to achieve the acquisition and setting of object cloning, attribute copy, and attribute values.Internal provinces allow developers to check the attributes of the object during runtime and operate these attributes by providing methods.
3. Type conversion: The Commons Beanutils framework provides a flexible type of conversion mechanism that can convert the attributes of the source object and the target object to ensure the correctness of the data.This framework supports the conversion between the basic data type and the common Java class, such as converting the string to an integer, converting the date to a string.
Below is a Java code example using the Commons Beanutils framework for attribute copy:
import org.apache.commons.beanutils.BeanUtils;
public class BeanCopyExample {
public static void main(String[] args) {
// Create source objects
SourceObject source = new SourceObject();
source.setName("John");
source.setAge(25);
// Create the target object
TargetObject target = new TargetObject();
try {
// Use Beanutils.copyproproPERTIES to copy attribute copy
BeanUtils.copyProperties(target, source);
// The attribute value of the output target object
System.out.println (target.getName ()); // Output: John
System.out.println (target.get.get ()); // Output: 25
} catch (Exception e) {
e.printStackTrace();
}
}
}
class SourceObject {
private String name;
private int age;
// omit the getter and setter method ...
}
class TargetObject {
private String name;
private int age;
// omit the getter and setter method ...
}
In the above example, we use Beanutils.copyProperties method to copy the attribute values of the source object into the target object.By reflecting and internal provincial mechanisms, the Commons Beanutils framework automatically copies the attribute value of the source object into the target object to achieve the function of the attribute copy.
Summary: The Commons Beanutils framework uses technologies such as reflection, internal province and type conversion to simplify the attribute copy and the acquisition and setting of the attribute values between the Java objects.It is a powerful and easy -to -use class library that can improve the development efficiency of developers.
