Research on the technical principles of the core framework in the Java class library

Research on the technical principles of the core framework in the Java class library In Java development, verifying the core framework is a very important technology.By verifying the framework, we can effectively test the input data to ensure that it meets the expected format, scope and rules.This article will introduce the principle of verifying the core framework and how to achieve it in the Java class library. The principle of verification core framework mainly involves three aspects: the definition of verification rules, the implementation of the verification device, and the trigger of the verification process.The implementation principles of each aspect will be introduced in detail below. 1. Definition of verification rules: Verification rules refer to the conditions or restrictions required to input data.In Java, we can use Annotion to define verification rules.By adding specific annotations to the attribute or method, we can specify the verification rules corresponding to the attribute or method.For example, using @Notnull annotations can indicate that the attribute cannot be empty. 2. Implementation of the verification device: The verification device is a tool for performing verification rules.In the Java class library, we can customize the verification device or use the existing verification library.The verification device usually traverses the attribute or method of the object of the object, and verifies the input data according to the verification rules defined in the annotation.If the verification fails, the verification device will generate corresponding error information.Common verification gallery include Hibernate Validator and Spring Validation. The following is the Java code of an example verification device: public class UserValidator { public List<String> validate(User user) { List<String> errors = new ArrayList<>(); if (user.getUsername() == null || user.getUsername().isEmpty()) { errors.add ("Username cannot be empty"); } // Other verification rules ... return errors; } } 3. Verification process trigger: In the Java library, the verification process is usually triggered by the framework or developer.The verification process can be carried out when the object's creation, update, or method call occurs.By triggering the verification process, we can obtain error information returned by the verification device and processed accordingly.For example, the error message can be displayed to the user or recorded in the log. The following is a Java code for examples to trigger the verification process: public class UserService { private UserValidator validator; // Inject it public void createUser(User user) { List<String> errors = validator.validate(user); if (!errors.isEmpty()) { // Process error information ... } // Create a user ... } } Through the above implementation principles, we can build a verification core framework in the Java library to ensure the effectiveness of the input data.Verifying the core framework can help us improve the security and stability of the system and reduce potential errors.