Self-study Spring AOP

I am a novice programmer is also the first time to write a blog this article is my combination of online information and some books to learn if there is something wrong, please leave a message to inform

This article describes the two knowledge points of AOP

1: Agent

There are two kinds of agents I write first: Java static proxy

1: Create an interface

Package com.proxy;/** * * @ClassName: iperson* @Description: Abstract definition of this role * @author * @date October 24, 2017 pm 6:40:43* */public in Terface IPerson {public void show ();

　　

2: Create class implementation interface

Package com.proxy;

public class Lishi implements IPerson {

public void Show () {
System.out.println ("La la La");
}

}

　　

3: Create proxy class implementation interface (requires incoming interface as parameter in construction method)

Package com.proxy;

/**
*
* @ClassName: Lishiproxy
* @Description: proxy class
* @author
* @date October 24, 2017 6:41:33
*
*/
public class Lishiproxy implements IPerson {
Private IPerson IP;

Public Lishiproxy (IPerson IPerson) {
Super ();
This.ip = IPerson;
}

public void Show () {
Ip.show ();
}

}

　　

4: Test class calls the proxy class for testing

Package Com.proxy;import Org.junit.test;public class Lishitest {@Testpublic void showls () {Lishi ls = new Lishi ();//an Agent can Sufficient to implement multiple implementation classes IPerson Lip = new Lishiproxy (LS); lip.show ();}}

　　

2:java Dynamic Agent

First steps.

1: Create an interface

Package Com.proxy2;public interface Iperson2 {public void eat ();

　　

2: Create class implementation interface

Package Com.proxy2;public class Ruan implements Iperson2 {public void Eat () {System.out.println ("Cheerleader");}

　　

3: Create proxy class Implementation interface Invocationhandler (constructor method requires incoming interface as parameter)

Package Com.proxy2;import Java.lang.reflect.invocationhandler;import Java.lang.reflect.method;public class Proxy2 Implements Invocationhandler {private Iperson2 iperson2;public Proxy2 (Iperson2 iperson2) {super (); This.iperson2 = Iperson2;}    Execute public object invoke (object proxy, method, object[] args) throws Throwable {//incoming is the executed person return Method.invoke (IP Erson2, args);}}

　　

Note Override a method

4: Test implements the proxy class for testing

Package Com.proxy2;import Java.lang.reflect.proxy;import Org.junit.test;public class Ruantest {@Testpublic void eat () { Iperson2 ip2 = new Ruan ();p roxy2 Proxy2 = new Proxy2 (IP2); Iperson2 iperson2 = (Iperson2) proxy.newproxyinstance (ruan.class . getClassLoader (), Ruan.class.getInterfaces (), Proxy2); Iperson2.eat ();}}

　　

2: Notice

Three types of notifications 1: Surround notifications

2: Front-facing notification

3: Post notification

Three kinds of notifications I wrote it together, sent it out once, and I'm going to write it down.

1: Create an interface

Package Com.proxy3;public interface IPerson3 {public void Seelp ();p ublic void Cadd ();}

　　

2: Create class to Implement interface target

Package Com.proxy3;public class Siming implements IPerson3 {public void Seelp () {System.out.println ("Hee Hee-hee hehe, ha ha ha haha");} public void Cadd () {System.out.println ("hahaha, notification Filtering");}}

　　

3: Create a proxy class notification

Package Com.proxy3;import Java.lang.reflect.method;import Org.springframework.aop.methodbeforeadvice;public class Beforeadvice implements Methodbeforeadvice {public void before (method, object[] args, Object target) throws Throwab Le {System.out.println ("Pre-Notification");}}

　　

4: Configure the Applicationcontext.xml file

<?xml version= "1.0" encoding= "UTF-8"? ><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" xmlns:tx= " Http://www.springframework.org/schema/tx "xmlns:context=" Http://www.springframework.org/schema/context "xsi: schemalocation= "Http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/ Spring-beans-4.3.xsd HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP/SPR Ing-aop-4.3.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/ Spring-context-4.3.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/ Spring-tx-4.3.xsd "><!--target instantiation--><bean id=" siming "class=" com.proxy3.Siming "></bean><!-- Pre-notification--><bean id= "Beforeadvice" class= "Com.proxy3.BeforeAdvice" ></bean><!--post notification--> <bean id= "Afteradvice" class= "Com.proxy3.AfterAdvice" ></bean><!--surround notification--><bean id= "Methods" class= "Com.proxy3.Methods" ></bean><!--a method to go back to trigger the notification--><bean id= "Mybefore" class= " Org.springframework.aop.support.RegexpMethodPointcutAdvisor "><property name=" advice "ref=" Beforeadvice " ></property><property name= "pattern" value= ". *add.*" ></property></bean><!--Configure the hybrid agent- -><bean id= "myproxy" class= "Org.springframework.aop.framework.ProxyFactoryBean" ><!--reference target-->< Property name= "Target" ref= "siming" ></property>< all interfaces implemented by!--target--><property name= "Proxyinterfaces" ><list><value>com.proxy3.IPerson3</value></list></property><!--Configuration Notifications- <property name= "Interceptornames" ><list><idref bean= "Methods"/><idref bean= "MyBefore"/> <idref bean= "Beforeadvice"/><idref bean= "Afteradvice"/&GT;&LT;/LIST&GT;&LT;/PROPERTY&GT;&LT;/BEAN&GT;&LT;/beans> 

This configuration file has a front and rear notification surrounding the configuration of the notification is interesting to see what has been written in detail

5: Use

Package Com.proxy3;import Org.junit.test;import Org.springframework.context.applicationcontext;import Org.springframework.context.support.classpathxmlapplicationcontext;public class Proxy3test {@Testpublic void Seelp ( {ApplicationContext AC = new Classpathxmlapplicationcontext ("Applicationcontext.xml"); IPerson3 IP3 = (IPerson3) Ac.getbean ("myproxy");//Ip3.seelp (); Ip3.cadd ();}}

　　

These are the results of my self-study. For the first time, if the writing is not good, please forgive me.

Self-study Spring AOP