Interpretation of the technical principles and implementation details of the NANNING framework in the Java class library

The Nanning framework is a popular Java class library that provides an annotation of AOP -based AOP (face -oriented programming) solution.This article will interpret the technical principles and implementation details of the Nanning framework, including related programming code and configuration. 1. Technical principle The technical principles of the Nanning framework are based on dynamic proxy and bytecode enhanced technology, and cut surface programming by generating proxy classes during runtime.This framework uses the Java bytecode manipulating library to operate and modify the Java bytecode to achieve dynamic modification of the target class. 2. Implement details The implementation details of the Nanning framework are as follows: 2.1 Create cutting surface By defining a Java class with annotations, a cut -off class can be created.The cutting point that needs to be executed before or after the goal method is executed or after the cutting. 2.2 Create the target class Create a target class that needs to be cut into, and define methods that need to be cut in in this class. 2.3 Definition entry point Use the annotation to identify the entry point in the cut surface, and specify the target class and target methods that need to be cut into. 2.4 Generate proxy classes API using the NANNING framework to generate proxy categories at runtime.The proxy class will inherit the target class and implement the entry point defined in the cut surface. 2.5 Modify the byte code of the target class By manipulating the Java bytecode, the proxy class generated and target category is merged during runtime.This process will modify the bytecode of the target class to make it have the starting point defined in the cut type. 2.6 Execution of cutting logic Before or after the target method is executed or after execution, the cutting point defined in the cut surface will be triggered and the corresponding cutting logic is executed. 3. Example code Below is a simple example code to demonstrate how to use the Nanning framework for AOP programming. First, define a cut -off class: public class LoggingAspect { @Before("execution(* com.example.MyClass.myMethod(..))") public void beforeAdvice() { System.out.println("Before method execution"); } } Then, create a target class: public class MyClass { public void myMethod() { System.out.println("Executing myMethod"); } } Next, configure the Nanning framework at the entrance to the application to generate the proxy class: public class Application { public static void main(String[] args) { MyClass targetObject = new MyClass(); AspectFactory aspectFactory = Weaver.createDelegatingDynamicMethod(); AspectInstance aspectInstance = aspectFactory.newInstance(LoggingAspect.class); MyClass proxy = (MyClass) aspectInstance.getProxy(); proxy.myMethod(); } } In the above example, the Loggingaspect class is a cut -off class, and the @Beface annotation specifies the entry point executed before the target method execution.The MyClass class is the target class, which contains the Mymethod method that needs to be cut in. In the Application class, first create a target targetObject, and then use AspectFactory to create a cut instance Aspectinstance, and pass the cut classes loggingaspect as a parameter.Finally, a proxy object Proxy is generated through the aspectinstance.getProxy () method, and the PROXY mymethod method is called. When the program is executed, the entry point defined in the cut -type loggingAspect will be triggered, and the output "BeFore Method Execution" will be used as the execution result of the cutting logic. Summarize: This article introduces the technical principles and implementation details of the NANNING framework, including the use of annotations to define cutting planes, target classes, and entry points. The proxy class is dynamically generated and the byte code is modified to achieve AOP programming.The example code demonstrates the use of the NANNING framework.