Detail

Detail Commons Beanutils Core is an open source Java class library that provides the function of simplifying Java object attribute operations.Through a set of simple and easy -to -use APIs, it makes it more convenient and flexible to read, write, copy and convey the attributes in Java applications. The technical principles of Commons Beanutils Core can be summarized as the following aspects: 1. Reflective mechanism: Commons Beanutils Core uses the Java's reflection mechanism to obtain and operate the attributes of the Java object.By calling the object and setter method of the object, you can read and modify the attribute values of the object.Using the reflection mechanism can dynamically obtain and operate the attributes of the object at runtime, thereby avoiding the specific name of the attributes of the object of the object during compilation. 2. Packaging and conversion: Use Commons Beanutils Core to encapsulate the attributes of the Java object into a MAP object, or get the attribute value from the MAP object and inject it into the object.In this way, we can use the MAP object to operate the attributes of the Java object, which is very useful.In addition, Commons Beanutils Core also provides the function of type conversion, which can automatically convert the attribute value of the string type into the type of target attribute, thereby avoiding the manual type conversion work. 3. Access control: Commons Beanutils Core provides an access control mechanism for object attributes.By setting the access level of object attributes, we can control which attributes can be read and modified, which attributes are read only, and which attributes are not visible.In this way, we can more flexibly control the access of object attributes. The following is some specific example code, which shows the usage of Commons Beanutils Core: 1. Obtain object attribute value: Person person = new Person(); person.setName("John"); String name = (String) PropertyUtils.getProperty(person, "name"); System.out.println (name); // Output: John 2. Set object attribute value: Person person = new Person(); PropertyUtils.setProperty(person, "name", "John"); System.out.println (Person.getName ()); // Output: John 3. Inject the MAP object into the Java object: Map<String, Object> properties = new HashMap<>(); properties.put("name", "John"); properties.put("age", 25); Person person = new Person(); BeanUtils.populate(person, properties); System.out.println (Person.getName ()); // Output: John System.out.println (Person.getage ()); // Output: 25 In summary, the Commons Beanutils Core framework has simplified the operation of the Java object attribute by using the Java's reflection mechanism, packaging and conversion, and access control technology, providing a convenient and flexible attribute operation function.It is a very practical tool that can save us in Java applications to write tedious attribute operation code and improve the readability and maintenance of code.