Apache Servicemix :: Bundles :: Spring AOP framework in the development of Java library development
Apache Servicemix :: Bundles :: Spring AOP framework in the development of Java library development
Introduction:
In the development of the Java library, using the Spring AOP (program -oriented programming) framework is a very useful technique.This article will introduce the Bundles provided by Apache Servicemix, and how to use Spring Aop to improve the performance and maintenance of the Java library.
What is Apache Servicemix :: Bundles?
Apache Servicemix :: Bundles is a tool set to build and manage Javabundle resources.It provides a convenient way to pack and deploy the Java class library so that it can be used in the ServiceMix container.Bundles also has some pre -configured functions and libraries, allowing developers to use the functions provided by Spring AOP more easily.
How to use Apache Servicemix :: Bundles and Spring Aop?
Step 1: Install Apache Servicemix :: Bundles
First, you need to download and install Apache ServiceMix :: Bundles.Find the latest version of Bundles on the download page and install it according to the instructions provided.After the installation is completed, the tool can be used in the ServiceMix container.
Step 2: Create a java class library
Next, create a Java class library project.Use any Java development tool, such as ECLIPSE or Intellij IDEA, create a new Java project, and include the required classes and methods in the project.Java code for writing business logic.
Step 3: Configure Spring Aop
In the Java class library project, add the related dependence of Spring AOP.In the Maven project, it can be achieved by adding the following dependencies to the POM.XML file:
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>...</version>
</dependency>
<!-Add other Spring related dependencies->
</dependencies>
Step 4: Create the cut surface
In the Java library project, create a cut -off class.The cutting type is a class used to define the entry point and enhance the operation.In the cutting class, you can use the Spring Aop annotation to identify the entry point and the enhanced operation that needs to be performed.
For example, the following is a simple example of cutting -sided classes:
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
@Aspect
public class LoggingAspect {
@Before("execution(* com.example.*.*(..))")
public void beforeAdvice() {
System.out.println("Before method execution");
}
}
In the above example, the annotation of `@aspect` indicates that this is a cut type.`@Before` Note defines the enhanced operation that needs to be performed before the entry point method is performed.
Step 5: Add cutting surface configuration
In Spring Aop, you need to configure the reference of the cutting type in the configuration file.Add the following in the configuration file of the Java class library project (such as ApplicationContext.xml), add the following:
<bean id="loggingAspect" class="com.example.LoggingAspect"/>
<aop:aspectj-autoproxy proxy-target-class="true"/>
The configuration above is registered with the cutting surface `Loggingaspect` as a bean, and use the` AOP: Aspectj-Autoproxy> `tag to enable automatic proxy.
Step 6: Deploy java class library
Package the Java library into a jar file and deploy it to the ServiceMix container.You can manage and deploy bundles with the command line tool or web interface provided by Apache Servicemix :: Bundles.
After the above steps are completed, the Java library will be able to run in the ServiceMix container and automatically perform the registered enhanced operation when performing the entry point method.
Summarize:
This article introduces how to use Apache Servicemix :: Bundles and Spring Aop to improve the performance and maintenance of the Java library.By using Spring AOP's cutting classes and configurations, developers can easily implement plane programming in the Java class library to enhance the reused and scalability of the code.By installing Apache Servicemix :: Bundles, it can be more convenient to manage and deploy the Java class library and make full use of the Spring AOP function.
