Spring Learning Path (iii) Bean annotation Management AOP operations

Add annotations on the class above, on the method above, on the attributes, and with the bean;

Writing method: @ annotation Name (attribute name = value)

First step: Import the jar package

Import Spring-aop.jar (Spring annotations package);

Step two: Create an entity class (annotation object)

 PackageCOM.AOP;ImportOrg.springframework.context.annotation.Scope;Importorg.springframework.stereotype.Component;/*** value is a custom attribute value * @Component (value= "user") * @Controller Web Tier * @Service Business layer * @Repository persistence layer * * (value= "xx" equivalent to <bean id= "xx" class= "path" ></bean> * Four annotation methods, all functions are the same*/@Component (Value= "User") @Scope (value= "Prototype")//Create multiple cases or a single case Public classAopuser { Public voidAdd () {System.out.println ("Add---------------"); }}

Step Three: Configure the annotations file to introduce constraints

Core constraint: spring-beans.xsd

Annotation constraint: spring-context.xsd

<?XML version= "1.0" encoding= "UTF-8"?><Beansxmlns= "Http://www.springframework.org/schema/beans"Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"Xmlns:context= "Http://www.springframework.org/schema/context"xsi:schemalocation= "Http://www.springframework.org/schema/beans Http://www.springframework.org/schema/beans/spring-beans . xsd Http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-con Text.xsd ">         <!--Turn on annotation scanning -        <!--Base-package: All annotations are scanned to the inside of the package -        <Context:component-scanBase-package= "COM.AOP"></Context:component-scan>      <!--<context:annotation-config></context:annotation-config> Annotations on scan properties -</Beans>

Fourth Step: Test

    @Test    publicvoid  Test () {        // Load Spring configuration file        New classpathxmlapplicationcontext ("Bean2.xml"); //         to get the value        of the annotation object of value Aopuser user =  (aopuser) context.getbean ("User");        User.add ();    }

Multi-Example Exercises

 PackageCom.ioc;ImportJavax.annotation.Resource;Importorg.junit.Test;Importorg.springframework.beans.factory.annotation.Autowired;ImportOrg.springframework.context.ApplicationContext;ImportOrg.springframework.context.support.ClassPathXmlApplicationContext;Importorg.springframework.stereotype.Component;Importorg.springframework.stereotype.Service; @Service (Value= "User") Public classUser {//@Autowired Both of these methods can be@Resource (name= "Userdao")//get Userdao annotation name    PrivateUserdao Userdao; //get a DAO object that does not require a set method when using annotation mode     Public voidAdd () {System.out.println ("user=====--------");    Userdao.add (); }}//Userdao class@Component (Value= "Userdao") Public classUserdao { Public voidAdd () {System.out.println ("DAO---------------"); }}//test; config file ibid.@Test Public voidTest () {//load Spring configuration fileApplicationContext context =NewClasspathxmlapplicationcontext ("Bean2.xml");//to get the value of the annotation object of valueUser user = (user) Context.getbean ("user")); User.add ();}

AOP Operations

1. Import the jar package (see Spring Getting started)

2. Create an entity class

 PackageCom.ioc;ImportJavax.annotation.Resource; Public classUser { Public voidAdd () {System.out.println ("user=====--------"); }}//Userdao classImportOrg.aspectj.lang.ProceedingJoinPoint; Public classUserdao { Public voidAdd () {System.out.println ("Front-mounted enhancement---------------"); }     Public voidAfter () {System.out.println ("Post-Enhancement------------"); }    //Surround Notifications     Public voidArount (Proceedingjoinpoint proceedingjoinpoint)throwsthrowable{//method beforeSystem.out.println ("method before executing----------------");//implementing an enhanced approachproceedingjoinpoint.proceed ();//method AfterSystem.out.println ("Execute----------------after Method"); }}

3. Configure Bean file (import AOP constraints)

<?XML version= "1.0" encoding= "UTF-8"?><Beansxmlns= "Http://www.springframework.org/schema/beans"Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"Xmlns:context= "Http://www.springframework.org/schema/context"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/context http://www.springframework.org/schema/context/spring-con Text.xsd HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP http://www.springframework.org/schema/aop/spring-aop.x SD ">           <!--Configuration Objects -         <BeanID= "User"class= "Com.ioc.User"></Bean>         <BeanID= "Userdao"class= "Com.ioc.UserDao"></Bean>         <!--Configuring AOP Operations -         <Aop:config>             <!--Configure Pointcuts -              <!--Execution (< access modifier;? < return type >< method name > (< parameters >) < exception >) -             <Aop:pointcutexpression= "Execution (* com.ioc.user.* (..))"ID= "POINTCUT1"/>             <!--to configure a plane, to put an enhancement on a method -             <Aop:aspectref= "Userdao">                 <!--configuration enhancement type; method: Set enhanced methods name in Userdao pointcut-ref: point to Pointcut ID value is to execute the method in the Userdao before executing the method in the user. -                 <Aop:beforeMethod= "Add"Pointcut-ref= "POINTCUT1"/>                 <!--Post enhancement Executes the user's method before the After method is executed -                 <aop:after-returningMethod= "after"Pointcut-ref= "POINTCUT1"/>                 <!--execute the method before and after executing the user method -                 <Aop:aroundMethod= "Arount"Pointcut-ref= "POINTCUT1"/>             </Aop:aspect>         </Aop:config></Beans>

4. Testing

 PackageCom.junit;Import Staticorg.junit.assert.*;Importorg.junit.Test;ImportOrg.springframework.context.ApplicationContext;ImportOrg.springframework.context.support.ClassPathXmlApplicationContext;ImportCom.ioc.User; Public classText {@Test Public voidTest () {//load Spring configuration fileApplicationContext context =NewClasspathxmlapplicationcontext ("Bean2.xml");//to get the value of the annotation object of valueUser user = (user) Context.getbean ("user"));    User.add (); }}

Spring Learning Path (iii) Bean annotation Management AOP operations