How to use the Javax Interceptor API in the Java library

The steps of using the Javax Interceptor API in the Java class library are as follows: 1. Import dependencies: First, ensure that the construction configuration of the project contains the dependency item of the javax.interceptor library.For example, in the Maven project, you can introduce the following dependencies to the Javax.interceptor library by adding the following dependencies in the DEPENDENCIES section of the pom.xml file: <dependency> <groupId>javax.interceptor</groupId> <artifactId>javax.interceptor-api</artifactId> <version>1.2</version> </dependency> 2. Create an interceptor class: Next, create a class to implement the interceptor interface in the javax.interceptor library.The interface defines the interceptor method that is executed before and after the method calls.The following is a code of an example interceptor: import javax.interceptor.AroundInvoke; import javax.interceptor.Interceptor; import javax.interceptor.InvocationContext; @Interceptor public class LoggingInterceptor { @AroundInvoke public Object logMethodExecution(InvocationContext context) throws Exception { // Process before the method call System.out.println ("Before calling:" + context.getmethod (). GetName ()); // Call the target method Object result = context.proceed(); // After the method calls, process it System.out.println ("After calling:" + context.getmethod (). GetName ()); return result; } } In the above code, we use @Interceptor and @AroundnDinvoke to mark this class as a interceptor and specify the interceptor method executed before and after the method calls. 3. Application interceptor: To use the interceptor to block the method, you need to add @InterCeptors annotations to the target class or method, and pass the reference of the interceptor class.The following is an example class that shows how to apply interceptors on the target method: import javax.interceptor.Interceptors; @Interceptors(LoggingInterceptor.class) public class MyClass { public void myMethod() { // The implementation of the target method } } In the above code, we applied LoggingInterceptor interceptors on the MyClass class.This means that when the MyMethod () method is called, the loggingInterceptor interceptor's logMethodexecution () method will be executed before and after the method calls. 4. Configuration interceptor: Finally, some configurations need to be performed according to the requirements of the specific application server or framework.For example, in the Javaee application server, the interceptor may be required in the web.xml file.Specific configuration steps and grammar are different from the application server, you can refer to the relevant documentation for configuration. In summary, this is how to use the Javax Interceptor API in the Java library.You need to import the dependency item of the javax.interceptor library, create a interceptor class to implement the interceptor interface, apply the interceptor to the target class or method, and perform appropriate configuration according to specific requirements.