Apache Servicemix :: Bundles :: Spring AOP framework in the Java library
Apache Servicemix :: Bundles :: Spring AOP framework in the Java library
Summary:
The Spring framework is a powerful open source framework that is used to build an enterprise -level Java application.The AOP (facing surface programming) module enables developers to separate the Cross-Cutting Concerns from the main business logic to improve the maintenance and reusability of the code.This article will introduce the application of the Spring AOP framework in the Java library of Apache Servicemix, and provide some corresponding Java code examples.
Import Spring AOP dependence:
Before using Spring Aop, you need to import the corresponding dependencies in the Java library of Apache Servicemix.In the Maven project, the introduction can be achieved by adding the following dependencies in the POM.XML file:
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>5.3.9</version>
</dependency>
Create a cut -off class:
Using Spring Aop in the Java library, you first need to create a cut -off class.The cut -off class is an ordinary Java class, which contains a series of horizontal logic.Here are a simple example of cutting surface:
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
@Aspect
public class LoggingAspect {
@Before("execution(* com.example.MyService.*(..))")
public void beforeMethodExecution() {
System.out.println("Log before method execution");
}
}
In the above example, the cut -onated loggingaspect contains a @BeFore type notification method BeForeMethodexecution ().This method uses @ASPECT annotations to mark it as the cut surface, and the @Before annotation indicates that the method will be executed before the entry point method.In this example, the entry point method is all methods in the MyService class.
Configure Spring Aop:
Configuration Spring AOP can be implemented by configuration files or using annotated configurations.The following is an example based on XML configuration:
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
<aop:aspectj-autoproxy>
<aop:include name="loggingAspect"/>
</aop:aspectj-autoproxy>
<bean id="loggingAspect" class="com.example.LoggingAspect"/>
</beans>
In the above examples, the cutting of the cut class Loggingaspect is introduced into the Spring Aop through the element of the `AOP: Include>` `` `` `` ``<AOP: Aspectj-AutoProxy>` `` `` `` `` `` `The element indicates the Spring AOP of the annotation driver.
Apply Spring Aop:
When the Spring AOP configuration is completed, it can be applied to the target class in the Java class library.The following is an example:
import org.springframework.stereotype.Component;
@Component
public class MyService {
public void doSomething() {
System.out.println("Doing something");
}
}
In the above examples, the target class MyService is marked as a Spring component with the `@component` annotation.
Finally, when the method of the MyService class is called, the BeForeMethodexEcution () method in the cutting type Loggingaspect will be called before the method execution, and the log information "LOG BeFore Method Execution".
in conclusion:
This article introduces the application of the Spring AOP framework in the Java library of Apache Servicemix.By creating cutting type, configured Spring AOP, and applying it to the target class, developers can use AOP in Java applications to achieve the separation of cross -sectional attention points.This method can improve the maintenance and reusability of the code, while also achieving better code isolation and modularization.
Hope this article helps to understand the application of the Spring AOP framework in Apache Servicemix.
