Using the technical principles and case analysis of ObjectOS :: Auto :: AUTO :: Annitations framework
Objectos :: auto :: Annotations is a Java -based automated mapping framework to simplify the mapping process between Java objects.It provides a simple and convenient way to come from the similar attributes between the two objects, which reduces the workload of the developer to manually write the mapping code.
Technical principle:
Objectos :: auto :: Annotations is to use Java's reflection mechanism to achieve automatic mapping.It analyzes the attributes of the source object and the target object, and then identifies the mapping relationship between the attributes by annotation.During the mapping process, it will automatically assign the attribute value of the source object to the target object according to the annotation configuration.
case analysis:
Suppose there is a User class and a UserDto class that has the same field name and needs to map the attribute value of one object to another.
First of all, we need to use @Mapto annotations on the userdto class to identify the mapping relationship.For example, we can add @Mapto ("Username") annotation to UserDto's name attribute, indicating that the username property of the user object is mapped to the name attribute of userdto.
public class User {
private String username;
private String email;
// Other attributes and methods
}
public class UserDto {
@MapTo("username")
private String name;
@MapTo("email")
private String emailAddress;
// Other attributes and methods
}
We can then use ObjectOS :: Auto :: Annotations framework to achieve automatic mapping.
public class Main {
public static void main(String[] args) {
User user = new User();
user.setUsername("John Doe");
user.setEmail("johndoe@example.com");
Mapper mapper = new Mapper();
UserDto userDto = mapper.map(user, UserDto.class);
System.out.println (userdto.getName ()); // Output "John Doe"
System.out.println (userdto.GeteMaiLDDRESS ()); // Output "Johndoe@example.com"
}
}
In the above example, we first created a User object and set the values of its username and email properties.Then, we created a mapper object and used its Map method to map the User object to UserDTO object.Finally, we can access the attributes of the UserDto object to get the value after mapping.
Summarize:
Objectos :: auto :: Annotations framework can help developers simplify the mapping process between Java objects.It uses the reflex mechanism and annotations to complete the attribute mapping, which reduces the workload of manual writing the mapping code.By using this framework, developers can more efficient data conversion between objects.
