案例一

案例二

角色分析

package coms.Design.Mode.Demo1;/*** 代理模式*/
public interface Rent {public  void  rent();public void x();
}

package coms.Design.Mode.Demo1;/*** 中介这个角色*/public class Proxy implements Rent {private Host host;public Proxy() {}public Proxy(Host host) {this.host = host;}@Overridepublic void rent() {host.rent();}@Overridepublic void x() {host.x();}//看房子public void seeHse() {System.out.println("中介带你看房子");}//收费public void money() {System.out.println("收中介费");}//合同public void Heh() {System.out.println("合同");}public  void  Phone(){System.out.println("中介带电话给房东明确交房的时间");}}

package coms.Design.Mode.Demo1;
//房东  租房
public class Host implements Rent{@Overridepublic void rent() {System.out.println("房东要租房子,要出租房子");}@Overridepublic void x() {System.out.println("我要执行的是X方法");}
}

package coms.Design.Mode.Demo1;/*** 操作的内容单一*/
public class Client {public static void main(String[] args) {Host host=new Host();
//        host.rent();//代理Proxy proxy = new Proxy(host);proxy.rent();proxy.seeHse();proxy.money();proxy.Heh();proxy.Phone();proxy.x();}}

"C:\Program Files\Java\jdk1.8.0_171\bin\java.exe" "-javaagent:D:\IDEA\com.text\IntelliJ IDEA 2020.1.2\lib\idea_rt.jar=58971:D:\IDEA\com.text\IntelliJ IDEA 2020.1.2\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_171\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_171\jre\lib\rt.jar;D:\SSM\com.JavaBasics\out\production\com.JavaBasics" coms.Design.Mode.Demo1.Client
房东要租房子,要出租房子
中介带你看房子
收中介费
合同
中介带电话给房东明确交房的时间
我要执行的是X方法Process finished with exit code 0

package coms.Design.Mode.Demo02;public interface UserService {void  adds();void delete();void  update();void  query();
}

package coms.Design.Mode.Demo02;/*** 正式的对象*/
public class UserServiceImp  implements  UserService{@Overridepublic void adds() {System.out.println("增加一条数据");}@Overridepublic void delete() {System.out.println("删除一条数据");}@Overridepublic void update() {System.out.println("修改一条数据");}@Overridepublic void query() {System.out.println("查询一条数据");}
}

package coms.Design.Mode.Demo02;public class UserServiceProxy implements UserService {private   UserServiceImp userService;public void  setUserService(UserServiceImp userService){this.userService=userService;}@Overridepublic void adds() {log("增加");userService.adds();}@Overridepublic void delete() {log("修改");userService.delete();}@Overridepublic void update() {userService.update();}@Overridepublic void query() {userService.query();}//日public  void  log(String msg){System.out.println("使用了"+msg+"msg想方法");}
}

Aop代码底层的本质是动态代理

package coms.Design.Mode.Demo03;/*** 代理模式*/
public interface Rent {public  void  rent();
}

package coms.Design.Mode.Demo03;//房东  租房
public class Host implements Rent {@Overridepublic void rent() {System.out.println("房东要租房子,要出租房子");}
}

package coms.Design.Mode.Demo03;import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;/*** 等会用这个类自动生成代理类*/
//处理代理实例并返回的结果
public class ProxyInvocationHandler implements InvocationHandler {//被代理的接口private Rent rent;public void setRent(Rent rent) {this.rent = rent;}//生成代理类 固定代码public Object getProxy() {
// 类的位置  接口  应用对象return Proxy.newProxyInstance(this.getClass().getClassLoader(), rent.getClass().getInterfaces(), this);}@Overridepublic Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
//动代代理的机制本质又是反射机制first();setHandler();Object result = method.invoke(rent, args);farer();end();return result;}public  void  setHandler(){System.out.println("中介在看房子");}public  void  farer(){System.out.println("看完后收中介费");}public   void  first(){System.out.println("去中介哪里找房子");}public   void  end(){System.out.println("收合同");}}

//案例一
public interface Rent {
public class Host implements Rent{
public class Proxy implements Rent {
//案例三
public interface Rent {
public class Host implements Rent {
public class ProxyInvocationHandler implements InvocationHandler {

package coms.Design.Mode.Demo04;import coms.Design.Mode.Demo03.Rent;import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;/*** 等会用这个类自动生成代理类*/
//处理代理实例并返回的结果
public class ProxyInvocationHandler implements InvocationHandler {//被代理的接口private Object target;public void setTarget(Object target) {this.target = target;}//生成代理类 固定代码public Object getProxy() {
// 类的位置  接口  应用对象return Proxy.newProxyInstance(this.getClass().getClassLoader(), target.getClass().getInterfaces(), this);}@Overridepublic Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
//动代代理的机制本质又是反射机制log(method.getName());Object result = method.invoke(target, args);return result;}//全自动化public  void log(String msg){System.out.println("执行了陌陌"+msg+"方法");}}

案例四的运行结果

项目的结构

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>spring0909</groupId><artifactId>Com.Spring</artifactId><packaging>pom</packaging><version>1.0-SNAPSHOT</version><modules><module>Spring-01-aop</module></modules><dependencies><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>5.2.0.RELEASE</version></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version><scope>test</scope></dependency></dependencies></project>

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><parent><artifactId>Com.Spring</artifactId><groupId>spring0909</groupId><version>1.0-SNAPSHOT</version></parent><modelVersion>4.0.0</modelVersion><artifactId>Spring-01-aop</artifactId><dependencies><dependency><groupId>org.aspectj</groupId><artifactId>aspectjweaver</artifactId><version>1.9.4</version></dependency></dependencies></project>

<?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:context="http://www.springframework.org/schema/context"xmlns:aop="http://www.springframework.org/schema/aop"xmlns:tx="http://www.springframework.org/schema/tx"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop.xsdhttp://www.springframework.org/schema/txhttp://www.springframework.org/schema/tx/spring-tx.xsd"><!--注册Bean--><bean id="userservice" class="com.service.UserServiceImp"></bean><bean id="log" class="log.Log"></bean><bean id="afterlog" class="log.Afterlog"></bean><!--方式三 --><bean id="annotationPointCut" class="diy.AnnotationPointCut"></bean><!--代理Aop注解支持 JDK  proxy-target-class="false" --><aop:aspectj-autoproxy></aop:aspectj-autoproxy>
</beans>

package diy;import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;/*** 方式三 使用注解方式实现Aop*/
//@Aspect 标注这个类是切面/*** @Before("execution(* com.service.UserServiceImp.*(..))")*  @After("execution(* com.service.UserServiceImp.*(..))")*/
@Aspect
public class AnnotationPointCut {@Before("execution(* com.service.UserServiceImp.*(..))")public void before() {System.out.println("==============方法执行前=================");}@After("execution(* com.service.UserServiceImp.*(..))")public void after() {System.out.println("==============方法执行后==================");}@Around("execution(* com.service.UserServiceImp.*(..))")public  void  around(ProceedingJoinPoint jp) throws Throwable {System.out.println("在环绕增强中,我们可以定义一个参数，代表我们要获取处理的切入点");Object o = jp.proceed();System.out.println("环绕前");}
}

package diy;/*** 自定义类*/
public class DiyPointcut {public  void  before(){System.out.println("==============方法执行前=================");}public  void  after(){System.out.println("==============方法执行后==================");}public  void  see(){System.out.println("SpringAop开发第二种方案自定义类");}
}

 <bean id="diy" class="diy.DiyPointcut"></bean><aop:config><!--自定义切面 ref 要引用的类--><aop:aspect ref="diy"><!--切入点--><aop:pointcut id="point" expression="execution(* com.service.UserServiceImp.*(..)))"/><!--通知--><aop:before method="before" pointcut-ref="point"></aop:before><aop:after method="after" pointcut-ref="point"></aop:after><aop:after method="see" pointcut-ref="point"></aop:after></aop:aspect></aop:config>

package com.service;public interface UserService {public  void  add();public  void  delete();public  void  update();public  void  query();
}

package com.service;public class UserServiceImp  implements UserService{@Overridepublic void add() {System.out.println("增加了一个用户");}@Overridepublic void delete() {System.out.println("删除了一个用户");}@Overridepublic void update() {System.out.println("修改了一个用户");}@Overridepublic void query() {System.out.println("查询了一个用户");}
}

package log;import org.springframework.aop.AfterReturningAdvice;import java.lang.reflect.Method;public class Afterlog  implements AfterReturningAdvice {/*** 多了一个返回值* @param o* @param method* @param objects* @param o1* @throws Throwable*/@Overridepublic void afterReturning(Object o, Method method, Object[] objects, Object o1) throws Throwable {System.out.println("执行了"+method.getName()+"返回了"+o);}
}

package log;import org.springframework.aop.MethodBeforeAdvice;import java.lang.reflect.Method;public class Log  implements MethodBeforeAdvice {//Method 要执行的目标对象方法//orgs  参数//target 目标对象@Overridepublic void before(Method method, Object[] args, Object target) throws Throwable {System.out.println(target.getClass().getName()+"的"+method.getName()+"被执行了");}
}

import com.service.UserService;
import com.service.UserServiceImp;
import org.springframework.context.support.ClassPathXmlApplicationContext;public class MaTest {public static void main(String[] args) {ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
//动态代理的是接口UserService userservice = (UserService) applicationContext.getBean("userservice");userservice.add();}
}

import com.service.UserService;
import com.service.UserServiceImp;
import org.springframework.context.support.ClassPathXmlApplicationContext;public class MaTest {public static void main(String[] args) {ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
//动态代理的是接口UserService userservice = (UserService) applicationContext.getBean("userservice");userservice.add();userservice.delete();userservice.query();userservice.update();}
}