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Spring入门4 静态代理动态代理 CGLIB AOP切入点切面 AOP注解

2018-01-23 22:46 781 查看

2018年1月23日 21:57:48

静态代理动态代理 CGLIB AOP切入点切面 AOP注解

第一部分课程内容静态代理实现步骤

第一步创建Person接口

package com.bdqn.entity;

public interface Person {
void say();

}

第二步创建OldPerson类实现Person接口重写方法Syso(小伙子不错哦)

package com.bdqn.entity;

public class OldPerson implements Person{
@Override
public void say() {
// TODO Auto-generated method stub
System.out.println("小伙子，不错啊,哈哈");
}

}

第三步创建代理类也实现Person接口

package com.bdqn.entity;

public class PersonProxy implements Person{
//多态父类引用指向子类
Person person=new OldPerson();
@Override//重写接口的抽象方法
public void say() {
// TODO Auto-generated method stub
person.say();//调用具体对象的方法
}

}

第四步测试类的main方法

//静态代理 Person接口声明say方法 OldPerson实现接口说小伙不错代理也实现Person接口 newOldPerson 实现的方法里调用Oldperson的方法

// PersonProxy personProxy=new PersonProxy();创建代理类

// personProxy.say();调用代理类的方法代理这个方法里会取找具体对象的方法

第二部分课内容动态代理

第一步动态代理类

动态代理类实现 InvocationHandler 接口

私有化Object类型的object1属性

private Object object1;

公有的有参数返回Object获得代理类方法

把参数object2赋值给私有化的objcet1

声明Object object3=Proxy.newProxyInstance(object2.getClass().getClassLoader(), object2.getClass().getInterfaces(), this);
return object3;

注意Proxy.newProxyInstance();是固定写法

重写接口的抽象方法

Object object4=method.invoke(object1, args);
return object4;

注意object1是已经把参数赋值了object1

args是该方法参数字符串数组的名

第二步测试类

new 具体对象和代理类调用代理的获得代理方法把具体对象传进去返回Object强转成接口然后调用接口的抽象方法

这个动态代理有个确定就是只能多态不能new实现类传进去返回实现类

//动态代理第一步代理类InvocationHandler接口声明私有OBJ对象

// Person person=new OldPerson();//这个动态弊端是只能多态

// SysProxy sysProxy=new SysProxy();

// Person person2=(Person) sysProxy.getProxy(person);

// person2.say();

第三部分课内容 CGLIB

CGLIB和动态代理相似但他能解决多态只能父类引用指向子类这个CGLIB可以new实现类传进去返回实现类出来

CGLIB和动态代理不一样的是实现接口不一样多了一个有参数构造方法

第一步CglibProxy代理类实现MethodInterceptor接口

私有化属性

//私有化目标对象
private Object object1;

无参数构造方法

有参数构造方法

//有参数构造
public CglibProxy(Object object2) {
super();
this.object1 = object2;
}

Enhancer new出来 set父Class和set回调

//获得代理
public Object getProxy(){
Enhancer enhancer=new Enhancer();
enhancer.setSuperclass(object1.getClass());
enhancer.setCallback(this);
return enhancer.create();
}

然后当然是动态调用具体对象的方法

//动态调用目标对象的方法
@Override
public Object intercept(Object arg0, Method arg1, Object[] arg2,
MethodProxy arg3) throws Throwable {
// TODO Auto-generated method stub
Object object3=arg1.invoke(object1, arg2);
return object3;
}

注意arg1是当前方法参数Method 的名,object1是有参数构造方法已经把参数赋值了object1,arg2是当前方法参数Object数组的名

测试类

//CGLIB动态代理第一步添加jar包实现接口第二步私有化属性第三步有参数构造第四步获得代理方法第五步动态调用方法的方法

// OldPerson oldPerson=new OldPerson();

// CglibProxy cglibProxy=new CglibProxy(oldPerson);

// OldPerson oldPerson2=(OldPerson) cglibProxy.getProxy();

// oldPerson2.say();

这样就可以返回实现类了

第四部分课 AOP切入点切面

<bean id="userdaoimpl" class="com.bdqn.daoImpl.UserDaoImpl"></bean>
<bean id="userserviceimpl" class="com.bdqn.serviceImpl.UserServiceImpl">
<property name="userDao" ref="userdaoimpl"></property>
</bean>
<bean id="qianmianlei" class="com.bdqn.entity.Mian"></bean>

<aop:config>

<aop:pointcut
expression="execution(* com.bdqn.serviceImpl.UserServiceImpl.*(..))"
id="qierudian" />

<aop:aspect ref="qianmianlei">

<aop:before method="qian" pointcut-ref="qierudian" />



<aop:after method="hou" pointcut-ref="qierudian" />
</aop:aspect>
</aop:config>

切面代理类里写各个方法

测试类

//切入点切入到哪个类去切面那个面切进去通知到哪个切入点
ApplicationContext AC=new ClassPathXmlApplicationContext("applicationContext.xml");
UserService userService=(UserService) AC.getBean("userserviceimpl");
userService.shut();

第五部分课内容 AOP注解

首先是配置文件必须在头部加入contxt和AOP那些还有jar包添加依赖

<?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:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd ">


<context:component-scan base-package="com.bdqn.entity,com.bdqn.dao,com.bdqn.daoImpl,com.bdqn.service,com.bdqn.serviceImpl,com.bdqn.test"></context:component-scan>

>
<bean class="com.bdqn.entity.ZhuJieMianDaiLi"></bean>


<aop:aspectj-autoproxy></aop:aspectj-autoproxy>

</beans>

UserDaoImpl类上@Repository("userDao")

UserServiceImpl类上@Service("service")下@Autowired

ZhuJieMianDaiLi类上切面@Aspect下切点方法上@Pointcut(value="execution(* com.bdqn.serviceImpl.UserServiceImpl.*(..))")要插入到哪个类具体对象类

要执行的之前方法上@Before(value="qie()")

要执行的之后方法上@After(value="qie()")

具体代理类代码

package com.bdqn.entity;

import org.aspectj.lang.annotation.After;

import org.aspectj.lang.annotation.Aspect;

import org.aspectj.lang.annotation.Before;

import org.aspectj.lang.annotation.Pointcut;

@Aspect

public class ZhuJieMianDaiLi {
@Pointcut(value="execution(* com.bdqn.serviceImpl.UserServiceImpl.*(..))")
public void qie(){}

@Before(value="qie()")
public void tongzhiqian(){
System.out.println("代理注解通知前的");
}
@After(value="qie()")
public void tongzhihou(){
System.out.println("代理注解通知后的");
}

}

测试类

package com.bdqn.test;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import org.springframework.stereotype.Repository;

import org.springframework.stereotype.Service;

import com.bdqn.service.UserService;

import com.bdqn.serviceImpl.UserServiceImpl;

public class Test {
public static void main(String[] args) {
//代理注解首先要在头部上面添加那几句contxt相关语句扫描包然后开启AOP注解支持
//第二步配置文件里代理类bean calss=全包名.类名可以不写id
//第三步 UserDaoImpl类类名上@Repository("userDao")
//第四步 UserService类类名上@Service("service") 类名下@Autowired
//第五步 xml文件开启AOP注解支持<aop:aspectj-autoproxy></aop:aspectj-autoproxy>
//第六步测试类只能多态父类引用指向子类
ApplicationContext ACC=new ClassPathXmlApplicationContext("applicationContextZhuJie.xml");
UserService userService=(UserService) ACC.getBean("service");
String str=userService.zhichi(88);
System.out.println(str);
}

}

下面附上本天课第一个项目静态代理动态代理 CGLIB AOP切入点切面所有类代码

package com.bdqn.entity;

public interface Person {
void say();

}

###############################################################

package com.bdqn.entity;

public class OldPerson implements Person{

@Override
public void say() {
// TODO Auto-generated method stub
System.out.println("小伙子，不错啊,哈哈");
}

}

###############################################################

package com.bdqn.entity;

public class PersonProxy implements Person{

Person person=new OldPerson();

@Override
public void say() {
// TODO Auto-generated method stub
person.say();
}

}

################################################################

package com.bdqn.entity;

import java.lang.reflect.InvocationHandler;

import java.lang.reflect.Method;

import java.lang.reflect.Proxy;

/**

*

* @author Administrator

*动态代理

*/

public class SysProxy implements InvocationHandler{
//第一步实现接口

//目标对象
private Object object1;

//得到代理对象测试了就是调用这个方法
public Object getProxy(Object object2){

this.object1=object2;//把传进来的参数也就是具体对象赋值给本类的对象来用

//注意导包
Object object3=Proxy.newProxyInstance(object2.getClass().getClassLoader(), object2.getClass().getInterfaces(), this);
return object3;
}

//动态的调用目标对象得的方法
@Override
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
// TODO Auto-generated method stub

Object object4=method.invoke(object1, args);
return object4;
}

}

################################################################################################

package com.bdqn.entity;

import java.lang.reflect.Method;

import net.sf.cglib.proxy.Enhancer;

import net.sf.cglib.proxy.MethodInterceptor;

import net.sf.cglib.proxy.MethodProxy;

public class CglibProxy implements MethodInterceptor{

//第一步添加jar包依赖实现接口

//私有化目标对象
private Object object1;

public CglibProxy() {
super();
}

//有参数构造
public CglibProxy(Object object2) {
super();
this.object1 = object2;
}

//获得代理
public Object getProxy(){
Enhancer enhancer=new Enhancer();
enhancer.setSuperclass(object1.getClass());
enhancer.setCallback(this);
return enhancer.create();
}

//动态调用目标对象的方法
@Override
public Object intercept(Object arg0, Method arg1, Object[] arg2,
MethodProxy arg3) throws Throwable {
// TODO Auto-generated method stub
Object object3=arg1.invoke(object1, arg2);
return object3;
}

}

#######################################################################################################3

package com.bdqn.entity;

import java.io.Serializable;

public class User implements Serializable{
private String uName;
private String uPwd;
public User() {
super();
}
public User(String uName, String uPwd) {
super();
this.uName = uName;
this.uPwd = uPwd;
}
@Override
public String toString() {
return "User [uName=" + uName + ", uPwd=" + uPwd + "]";
}
public String getuName() {
return uName;
}
public void setuName(String uName) {
this.uName = uName;
}
public String getuPwd() {
return uPwd;
}
public void setuPwd(String uPwd) {
this.uPwd = uPwd;
}

}

############################################################################

package com.bdqn.dao;

public interface UserDao {
void shut();
String zhichi(int sum);

}

#############################################################################

package com.bdqn.daoImpl;

import javax.management.RuntimeErrorException;

import com.bdqn.dao.UserDao;

public class UserDaoImpl implements UserDao{

@Override
public void shut(){
// TODO Auto-generated method stub
System.out.println("用户类 shut 了"+"\n"+"切入面");
//throw new RuntimeException();
}

@Override
public String zhichi(int sum) {
// TODO Auto-generated method stub
System.out.println("传进了的int类型sum值是:"+sum);
return "Hello KGC!";
}

}

###########################################################################################

package com.bdqn.service;

public interface UserService {
void shut();
String zhichi(int sum);

}

#########################################################################################3

package com.bdqn.serviceImpl;

import com.bdqn.dao.UserDao;

import com.bdqn.daoImpl.UserDaoImpl;

import com.bdqn.service.UserService;

public class UserServiceImpl implements UserService{
private UserDao userDao;

public UserDao getUserDao() {
return userDao;
}

public void setUserDao(UserDao userDao) {
this.userDao = userDao;
}

@Override
public void shut() {
// TODO Auto-generated method stub
userDao.shut();
}

@Override
public String zhichi(int sum) {
// TODO Auto-generated method stub
return userDao.zhichi(sum);
}

}

############################################################################################

package com.bdqn.test;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.bdqn.entity.CglibProxy;

import com.bdqn.entity.ErMian;

import com.bdqn.entity.OldPerson;

import com.bdqn.entity.Person;

import com.bdqn.entity.PersonProxy;

import com.bdqn.entity.SysProxy;

import com.bdqn.service.UserService;

import com.bdqn.serviceImpl.UserServiceImpl;

public class Test {
public static void main(String[] args) {

//静态代理 Person接口声明say方法 OldPerson实现接口说小伙不错代理也实现Person接口 newOldPerson 实现的方法里调用Oldperson的方法

// PersonProxy personProxy=new PersonProxy();

// personProxy.say();

//动态代理第一步代理类InvocationHandler接口声明私有OBJ对象

// Person person=new OldPerson();//这个动态弊端是只能多态

// SysProxy sysProxy=new SysProxy();

// Person person2=(Person) sysProxy.getProxy(person);

// person2.say();

//CGLIB动态代理第一步添加jar包实现接口第二步私有化属性第三步有参数构造第四步获得代理方法第五步动态调用方法的方法

// OldPerson oldPerson=new OldPerson();

// CglibProxy cglibProxy=new CglibProxy(oldPerson);

// OldPerson oldPerson2=(OldPerson) cglibProxy.getProxy();

// oldPerson2.say();

//切入点切入到哪个类去切面那个面切进去通知到哪个切入点
ApplicationContext AC=new ClassPathXmlApplicationContext("applicationContext.xml");
UserService userService=(UserService) AC.getBean("userserviceimpl");
userService.shut();
ErMian erMian=(ErMian) AC.getBean("ermian");
erMian.run();
}

}

#######################################################################################################

<?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:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd ">


<context:component-scan base-package="com.bdqn.service"></context:component-scan>

<bean id="userdaoimpl" class="com.bdqn.daoImpl.UserDaoImpl"></bean>
<bean id="ermian" class="com.bdqn.entity.ErMian"></bean>
<bean id="userserviceimpl" class="com.bdqn.serviceImpl.UserServiceImpl">
<property name="userDao" ref="userdaoimpl"></property>
</bean>
<bean id="qianmianlei" class="com.bdqn.entity.Mian"></bean>

<aop:config>

<aop:pointcut
expression="execution(* com.bdqn.serviceImpl.UserServiceImpl.*(..))"
id="qierudian" />

<aop:aspect ref="qianmianlei">

<aop:before method="qian" pointcut-ref="qierudian" />



<aop:after method="hou" pointcut-ref="qierudian" />
</aop:aspect>
</aop:config>

</beans>



#################################################################################################

package com.bdqn.entity;

public class Mian {
public void qian(){
System.out.println("before 是在某连接点之前执行的通知");
}

public void ret(){
System.out.println("returning 是在某连接点正常完成之后通知");
}

public void thr(){
System.out.println("throwing 是在方法抛出异常退出时执行的通知");
}

public void aro(){
System.out.println("around 是包围一个连接点的通知");
}
public void hou(){
System.out.println("after 是在某连接点退出时执行的通知");
}

}

################################################################################################

package com.bdqn.entity;

public class ErMian {
public void run(){
System.out.println("跑步"+"\n"+"跑了十圈");
}

}

################################################

下面附上本天课第二个项目 AOP注解所有类代码

package com.bdqn.test;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import org.springframework.stereotype.Repository;

import org.springframework.stereotype.Service;

import com.bdqn.service.UserService;

import com.bdqn.serviceImpl.UserServiceImpl;

public class Test {
public static void main(String[] args) {
//代理注解首先要在头部上面添加那几句contxt相关语句扫描包然后开启AOP注解支持
//第二步配置文件里代理类bean calss=全包名.类名可以不写id
//第三步 UserDaoImpl类类名上@Repository("userDao")
//第四步 UserService类类名上@Service("service") 类名下@Autowired
//第五步 xml文件开启AOP注解支持<aop:aspectj-autoproxy></aop:aspectj-autoproxy>
//第六步测试类只能多态父类引用指向子类
ApplicationContext ACC=new ClassPathXmlApplicationContext("applicationContextZhuJie.xml");
UserService userService=(UserService) ACC.getBean("service");
String str=userService.zhichi(88);
System.out.println(str);
}

}

#################################################################################
<?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:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd ">


<context:component-scan base-package="com.bdqn.entity,com.bdqn.dao,com.bdqn.daoImpl,com.bdqn.service,com.bdqn.serviceImpl,com.bdqn.test"></context:component-scan>

<bean class="com.bdqn.entity.ZhuJieMianDaiLi"></bean>


<aop:aspectj-autoproxy></aop:aspectj-autoproxy>

</beans>



##################################################################################################################
package com.bdqn.entity;

import org.aspectj.lang.annotation.After;

import org.aspectj.lang.annotation.Aspect;

import org.aspectj.lang.annotation.Before;

import org.aspectj.lang.annotation.Pointcut;

@Aspect

public class ZhuJieMianDaiLi {
@Pointcut(value="execution(* com.bdqn.serviceImpl.UserServiceImpl.*(..))")
public void qie(){}

@Before(value="qie()")
public void tongzhiqian(){
System.out.println("代理注解通知前的");
}
@After(value="qie()")
public void tongzhihou(){
System.out.println("代理注解通知后的");
}

}

##############################################################################################################
package com.bdqn.entity;

import java.io.Serializable;

public class User implements Serializable{
private String uName;
private String uPwd;
public User() {
super();
}
public User(String uName, String uPwd) {
super();
this.uName = uName;
this.uPwd = uPwd;
}
@Override
public String toString() {
return "User [uName=" + uName + ", uPwd=" + uPwd + "]";
}
public String getuName() {
return uName;
}
public void setuName(String uName) {
this.uName = uName;
}
public String getuPwd() {
return uPwd;
}
public void setuPwd(String uPwd) {
this.uPwd = uPwd;
}

}

########################################################################################################
package com.bdqn.dao;

public interface UserDao {
void shut();
String zhichi(int sum);

}

############################################################################################33333
package com.bdqn.daoImpl;

import javax.management.RuntimeErrorException;

import org.springframework.stereotype.Repository;

import com.bdqn.dao.UserDao;

@Repository("userDao")

public class UserDaoImpl implements UserDao{

@Override
public void shut(){
// TODO Auto-generated method stub
System.out.println("用户类 shut 了"+"\n"+"切入面");
//throw new RuntimeException();
}

@Override
public String zhichi(int sum) {
// TODO Auto-generated method stub
System.out.println("传进了的int类型sum值是:"+sum);
return "Hello KGC!";
}

}

#######################################################################################################
package com.bdqn.service;

public interface UserService {
void shut();
String zhichi(int sum);

}

######################################################################################################

package com.bdqn.serviceImpl;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Qualifier;

import org.springframework.stereotype.Service;

import com.bdqn.dao.UserDao;

import com.bdqn.daoImpl.UserDaoImpl;

import com.bdqn.service.UserService;

@Service("service")

public class UserServiceImpl implements UserService{
@Autowired
//@Qualifier
private UserDao userDao;

public UserDao getUserDao() {
return userDao;
}

public void setUserDao(UserDao userDao) {
this.userDao = userDao;
}

@Override
public void shut() {
// TODO Auto-generated method stub
userDao.shut();
}

@Override
public String zhichi(int sum) {
// TODO Auto-generated method stub
System.out.println("逻辑层实现了");
return userDao.zhichi(sum);
}

}
################################################################################################################

?

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章节导航

Spring入门4 静态代理 动态代理 CGLIB AOP切入点切面 AOP注解

Spring入门4 静态代理动态代理 CGLIB AOP切入点切面 AOP注解