Research on the technical principle of the Commons Beanutils framework

Research on the technical principle of the Commons Beanutils framework Commons Beanutils is an open source Java framework developed by the Apache organization, which provides a convenient way to operate the attributes and methods of the Java object.It can help developers simplify code and improve the flexibility and scalability of the system.This article will study the technical principles of the Commons Beanutils framework, and provide some Java code examples to illustrate its usage. 1. Reflective mechanism COMMONS BeANUTIL's core principle is Java's reflection mechanism.Reflection refers to the attributes, methods, and constructors that dynamically obtain and operate the class during runtime.By using reflexes, Commons Beanutils can obtain and set the attributes and methods of Java objects during runtime, without having to know its specific structure in advance.This allows developers to write universal code, which can apply to different Java classes and objects. The following is an example that shows how to use the reflex function of Commons Beanutils to obtain and set the attributes of the Java object: // Create a Java object User user = new User(); user.setName("John"); user.setAge(25); // Use Beanutils to obtain the attribute value of the object String name = Beanutils.getProperty (user, "name"); // Get the attribute value "John" int age = Integer.parseint (Beanutils.GetProperty (user, "Age"); // Get the attribute value 25 // Use Beanutils to set the attribute value of the object Beanutils.setproperty (user, "name", "mike"); // set the attribute value to "mike" Beanutils.setproperty (user, "age", "30"); // Set the attribute value to 30 2. Package and adapter In addition to the reflection mechanism, Commons Beanutils also provides packaging and adapter functions.Packaging refers to packaging the Java object into another object to provide more convenient access and operation.The adapter refers to the adaptation of the Java object as an interface or class that executes specific operations. A common application is to encapsulate the Java object into the MAP object for more convenient access and operating attributes.The following is an example that shows how to use Commons Beanutils to encapsulate the Java object into the map: // Create a Java object User user = new User(); user.setName("John"); user.setAge(25); // Package the Java object into the map Map<String, Object> userMap = BeanUtils.describe(user); // Get the attribute value of the object from the map String name = (string) usermap.get ("name"); // Get the attribute value "john" int age = Integer.parseint ((String) Usermap.get ("Age"); // Get the attribute value of 25 at 25 3. Other functions Commons Beanutils also provides other useful functions, such as type conversion, attribute copy, and batch operations.These functions can help developers to handle Java objects more conveniently. The following is an example that shows how to use Commons Beanutils for type conversion and attribute copy: // Create a source object User sourceUser = new User(); sourceUser.setName("John"); sourceUser.setAge(25); // Create a target object User targetUser = new User(); // Use Beanutils for attribute copy and type conversion BeanUtils.copyProperties(targetUser, sourceUser); System.out.println (targetuser.getName ()); // output "John" System.out.println (targetuser.getage ()); // Output 25 In summary, Commons Beanutils is a Java framework based on a reflection mechanism, which provides a convenient way to operate the attributes and methods of the Java object.By using technical principles such as reflexes, packaging, and adapter, Commons Beanutils enables developers to easily handle and operate Java objects, saving a lot of development time and code. The above is an overview of the research principles of the Commons Beanutils framework, and it provides some Java code examples to illustrate its usage.It is hoped that through the introduction of this article, readers can better understand and apply the Commons Beanutils framework.