Spring之aop

目录

1、什么是aop

2、AOP带来的好处

3、AOP中关键性概念

4.Aop的关键名词

1、前置通知

2、后置通知

3、环绕通知

4、异常通知

5、过滤通知

---

哈喽大家好！！今天给大家分享的是Spring的第二个知识aop！！！

1、什么是aop

AOP即面向切面编程

2、AOP带来的好处

让我们可以 “专心做事”
案例：
public void doSameBusiness (long lParam,String sParam){
// 记录日志
log.info(“调用 doSameBusiness方法，参数是：”+lParam);
// 输入合法性验证
if (lParam<=0){
throws new IllegalArgumentException(“xx应该大于0”);
}
if (sParam==null || sParam.trim().equals(“”)){
throws new IllegalArgumentException(“xx不能为空”);
}
// 异常处理
try{ …
}catch(…){
}catch(…){
}
// 事务控制
tx.commit();
}

3、AOP中关键性概念

①连接点(Joinpoint)：程序执行过程中明确的点，如方法的调用，或者异常的抛出.
②目标(Target)：被通知(被代理)的对象
完成具体的业务逻辑
③通知(Advice)：在某个特定的连接点上执行的动作，同时Advice也是程序代码的具体实现，例如一个实现日志记录的代码(通知有些书上也称为处理)
完成切面编程
④代理(Proxy)：将通知应用到目标对象后创建的对象(代理=目标+通知),
例子：外科医生+护士
只有代理对象才有AOP功能，而AOP的代码是写在通知的方法里面的
⑤切入点(Pointcut)：多个连接点的集合，定义了通知应该应用到那些连接点。
(也将Pointcut理解成一个条件 ，此条件决定了容器在什么情况下将通知和目标组合成代理返回给外部程序)
⑥适配器(Advisor)：适配器=通知(Advice)+切入点(Pointcut)

4.Aop的关键名词

1、前置通知

①spring-context.xml配置

<!-- 目标对象 -->
	<bean class="com.zking.aop.biz.impl.BookBizImpl" id="bookBiz"></bean>
	<!-- 前置通知 -->
	<bean class="com.zking.aop.advice.MyMethodBeforeAdvice" id="myBefore"></bean>
	<!-- 代理对象=目标+通知 -->
	<bean class="org.springframework.aop.framework.ProxyFactoryBean" id="bookProxy">
		<!-- 目标 -->
		<property name="target" ref="bookBiz"></property>
		<!-- 目标所实现的接口列表 -->
		<property name="proxyInterfaces">
			<list>
				<value>com.zking.aop.biz.BookBiz</value>
			</list>
		</property>
		<!-- 通知:正式调用目标方法的时候，会调用下面指定的通知 -->
		<property name="interceptorNames">
			<list>
				<value>myBefore</value>
			</list>
		</property>
	</bean>

MyMethodBeforeAdvice  

package com.zking.aop.advice;

import java.lang.reflect.Method;
import java.util.Arrays;

import org.springframework.aop.MethodBeforeAdvice;

/**
 * 前置通知
 *	买书、评论前加系统日志
 * @author Administrator
 *
 */
public class MyMethodBeforeAdvice implements MethodBeforeAdvice{

	@Override
	public void before(Method arg0, Object[] arg1, Object arg2) throws Throwable {
//		目标对象的类名
		String clzName = arg2.getClass().getName();
//		当前调用的方法是
		String methodName = arg0.getName();
//		当前调用方法所传递参数
		String args = Arrays.toString(arg1);
		System.out.println("【系统日志】："+clzName+"."+methodName+"被调用,传递的参数为："+args);
	}
	
}

BookBizImpl 

package com.zking.aop.biz.impl;

import com.zking.aop.biz.BookBiz;
import com.zking.aop.exception.PriceException;

public class BookBizImpl implements BookBiz {

	public BookBizImpl() {
		super();
	}

	public boolean buy(String userName, String bookName, Double price) {
		// 通过控制台的输出方式模拟购书
		if (null == price || price <= 0) {
			throw new PriceException("book price exception");
		}
//		logDao.add->sout("买书相关日志...")
		System.out.println(userName + " buy " + bookName + ", spend " + price);
		return true;
	}

	public void comment(String userName, String comments) {
		// 通过控制台的输出方式模拟发表书评
		System.out.println(userName + " say:" + comments);
	}

}

PriceException 

package com.zking.aop.exception;

public class PriceException extends RuntimeException {

	public PriceException() {
		super();
	}

	public PriceException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
		super(message, cause, enableSuppression, writableStackTrace);
	}

	public PriceException(String message, Throwable cause) {
		super(message, cause);
	}

	public PriceException(String message) {
		super(message);
	}

	public PriceException(Throwable cause) {
		super(cause);
	}
	
}

Demo1 

package com.zking.aop.test;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.zking.aop.biz.BookBiz;

public class Demo1 {
	@SuppressWarnings("resource")
	public static void main(String[] args) {
		ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("/spring-context.xml");
//		BookBiz bean = (BookBiz)context.getBean("bookBiz");
		BookBiz bean = (BookBiz)context.getBean("bookProxy");
		bean.buy("bobo", "dsq", 6.6d);
		bean.comment("sfd", "asd");
	}
}

 

2、后置通知

①spring-context.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<beans default-autowire="byName" 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: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/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

	<!-- IOC的主要作用管理整个项目的javabean，依靠依赖注入、控制反转的特点进行管理 -->
	<bean class="com.zking.biz.impl.UserBizImpl1" id="userBiz"></bean>
	<!-- <bean class="com.zking.biz.impl.UserBizImpl2" id="userBiz"></bean> -->
	<!-- set注入 -->
	<bean class="com.zking.web.UserAction" id="userAction">
		<property name="userBiz" ref="userBiz"></property>
		<property name="age" value="22"></property>
		<property name="name" value="zhangsan"></property>
		<property name="hobby">
			<list>
				<value>篮球</value>
				<value>boy</value>
				<value>篮球</value>
			</list>
		</property>
	</bean>
	<!-- 构造注入 -->
	<bean class="com.zking.web.OrderAction" id="orderAction">
		<property name="userBiz" ref="userBiz"></property>
		<constructor-arg name="name" value="zhangsan"></constructor-arg>
		<constructor-arg name="age" value="22"></constructor-arg>
		<constructor-arg name="hobby">
			<list>
				<value>篮球</value>
				<value>boy</value>
				<value>篮球</value>
			</list>
		</constructor-arg>
	</bean>
	
	<!-- 目标对象 -->
	<bean class="com.zking.aop.biz.impl.BookBizImpl" id="bookBiz"></bean>
	<!-- 前置通知 -->
	<bean class="com.zking.aop.advice.MyMethodBeforeAdvice" id="myBefore"></bean>
	<!-- 后置通知 -->
	<bean class="com.zking.aop.advice.MyAfterReturningAdvice" id="myAfter"></bean>
	<!-- 代理对象=目标+通知 -->
	<bean class="org.springframework.aop.framework.ProxyFactoryBean" id="bookProxy">
		<!-- 目标 -->
		<property name="target" ref="bookBiz"></property>
		<!-- 目标所实现的接口列表 -->
		<property name="proxyInterfaces">
			<list>
				<value>com.zking.aop.biz.BookBiz</value>
			</list>
		</property>
		<!-- 通知:正式调用目标方法的时候，会调用下面指定的通知 -->
		<property name="interceptorNames">
			<list>
				<value>myBefore</value>
				<value>myAfter</value>
			</list>
		</property>
	</bean>
	
</beans>

MyAfterReturningAdvice 

package com.zking.aop.advice;

import java.lang.reflect.Method;
import java.util.Arrays;

import org.springframework.aop.AfterReturningAdvice;

public class MyAfterReturningAdvice implements AfterReturningAdvice{

	@Override
	public void afterReturning(Object arg0, Method arg1, Object[] arg2, Object arg3) throws Throwable {
//		目标对象的类名
		String clzName = arg3.getClass().getName();
//		当前调用的方法是
		String methodName = arg1.getName();
//		当前调用方法所传递参数
		String args = Arrays.toString(arg2);
		System.out.println("【买书返利】："+clzName+"."+methodName+"被调用,传递的参数为："+args+";目标对象方法返回值为："+arg0);
	}

}

3、环绕通知

①Demo1

package com.zking.aop.test;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.zking.aop.biz.BookBiz;

public class Demo1 {
	@SuppressWarnings("resource")
	public static void main(String[] args) {
		ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("/spring-context.xml");
//		BookBiz bean = (BookBiz)context.getBean("bookBiz");
		BookBiz bean = (BookBiz)context.getBean("bookProxy");
		bean.buy("bobo", "jpm", 6.6d);
		bean.comment("sfd", "asd");
	}
}

MethodInterceptor 

package com.zking.aop.advice;

import java.util.Arrays;

import org.aopalliance.intercept.MethodInvocation;

/**
 * 环绕通知=前置通知+后置通知
 * @author Administrator
 *
 */
public class MethodInterceptor implements org.aopalliance.intercept.MethodInterceptor{

	@Override
	public Object invoke(MethodInvocation arg0) throws Throwable {
//		目标对象的类名
		String clzName = arg0.getThis().getClass().getName();
//		当前调用的方法是
		String methodName = arg0.getMethod().getName();
//		当前调用方法所传递参数
		String args = Arrays.toString(arg0.getArguments());
		System.out.println("【环绕通知】："+clzName+"."+methodName+"被调用,传递的参数为："+args);
//		方法的返回值	执行目标方法	bookBiz.buy(as,jasd,6.6);
		Object rs = arg0.proceed();
		System.out.println("【环绕通知】：目标对象方法返回值为："+rs);
		return rs;
	}

}

③spring-context.xml 

<?xml version="1.0" encoding="UTF-8"?>
<beans default-autowire="byName" 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: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/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

	<!-- IOC的主要作用管理整个项目的javabean，依靠依赖注入、控制反转的特点进行管理 -->
	<bean class="com.zking.biz.impl.UserBizImpl1" id="userBiz"></bean>
	<!-- <bean class="com.zking.biz.impl.UserBizImpl2" id="userBiz"></bean> -->
	<!-- set注入 -->
	<bean class="com.zking.web.UserAction" id="userAction">
		<property name="userBiz" ref="userBiz"></property>
		<property name="age" value="22"></property>
		<property name="name" value="zhangsan"></property>
		<property name="hobby">
			<list>
				<value>篮球</value>
				<value>boy</value>
				<value>篮球</value>
			</list>
		</property>
	</bean>
	<!-- 构造注入 -->
	<bean class="com.zking.web.OrderAction" id="orderAction">
		<property name="userBiz" ref="userBiz"></property>
		<constructor-arg name="name" value="bobo"></constructor-arg>
		<constructor-arg name="age" value="19"></constructor-arg>
		<constructor-arg name="hobby">
			<list>
				<value>篮球</value>
				<value>boy</value>
				<value>篮球</value>
			</list>
		</constructor-arg>
	</bean>
	
	<!-- 目标对象 -->
	<bean class="com.zking.aop.biz.impl.BookBizImpl" id="bookBiz"></bean>
	<!-- 前置通知 -->
	<bean class="com.zking.aop.advice.MyMethodBeforeAdvice" id="myBefore"></bean>
	<!-- 后置通知 -->
	<bean class="com.zking.aop.advice.MyAfterReturningAdvice" id="myAfter"></bean>
	<!-- 环绕通知 -->
	<bean class="com.zking.aop.advice.MethodInterceptor" id="myMethod"></bean>
	<!-- 代理对象=目标+通知 -->
	<bean class="org.springframework.aop.framework.ProxyFactoryBean" id="bookProxy">
		<!-- 目标 -->
		<property name="target" ref="bookBiz"></property>
		<!-- 目标所实现的接口列表 -->
		<property name="proxyInterfaces">
			<list>
				<value>com.zking.aop.biz.BookBiz</value>
			</list>
		</property>
		<!-- 通知:正式调用目标方法的时候，会调用下面指定的通知 -->
		<property name="interceptorNames">
			<list>
				<value>myBefore</value>
				<value>myAfter</value>
				<value>myMethod</value>
			</list>
		</property>
	</bean>
	
</beans>

4、异常通知

①Demo1

package com.zking.aop.test;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.zking.aop.biz.BookBiz;

public class Demo1 {
	@SuppressWarnings("resource")
	public static void main(String[] args) {
		ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("/spring-context.xml");
//		BookBiz bean = (BookBiz)context.getBean("bookBiz");
		BookBiz bean = (BookBiz)context.getBean("bookProxy");
		bean.buy("bobo", "jpm", -6.6d);
		bean.comment("sfd", "asd");
	}
}

MyThrowsAdvice 

package com.zking.aop.advice;

import org.springframework.aop.ThrowsAdvice;

import com.zking.aop.exception.PriceException;

/**
 * 关于过滤通知
 * 	相较于前置通知、后置通知、环绕通知有一个非常大的区别
 * 	前面三大通知都需要实现其中的方法
 * 	环绕通知则不需要，但是，它的方法名又是固定的；
 * @author Administrator
 *
 */
public class MyThrowsAdvice implements ThrowsAdvice{
	public void after(PriceException p) {
		System.out.println("【异常通知】：当价格发生异常，那么执行此处代码块！！！");
	}
}

③spring-context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans default-autowire="byName" 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: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/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

	<!-- IOC的主要作用管理整个项目的javabean，依靠依赖注入、控制反转的特点进行管理 -->
	<bean class="com.zking.biz.impl.UserBizImpl1" id="userBiz"></bean>
	<!-- <bean class="com.zking.biz.impl.UserBizImpl2" id="userBiz"></bean> -->
	<!-- set注入 -->
	<bean class="com.zking.web.UserAction" id="userAction">
		<property name="userBiz" ref="userBiz"></property>
		<property name="age" value="22"></property>
		<property name="name" value="bobo"></property>
		<property name="hobby">
			<list>
				<value>篮球</value>
				<value>boy</value>
				<value>篮球</value>
			</list>
		</property>
	</bean>
	<!-- 构造注入 -->
	<bean class="com.zking.web.OrderAction" id="orderAction">
		<property name="userBiz" ref="userBiz"></property>
		<constructor-arg name="name" value="bobo"></constructor-arg>
		<constructor-arg name="age" value="22"></constructor-arg>
		<constructor-arg name="hobby">
			<list>
				<value>篮球</value>
				<value>boy</value>
				<value>篮球</value>
			</list>
		</constructor-arg>
	</bean>
	
	<!-- 目标对象 -->
	<bean class="com.zking.aop.biz.impl.BookBizImpl" id="bookBiz"></bean>
	<!-- 前置通知 -->
	<bean class="com.zking.aop.advice.MyMethodBeforeAdvice" id="myBefore"></bean>
	<!-- 后置通知 -->
	<bean class="com.zking.aop.advice.MyAfterReturningAdvice" id="myAfter"></bean>
	<!-- 异常通知 -->
	<bean class="com.zking.aop.advice.MyThrowsAdvice" id="myThrows"></bean>
	<!-- 环绕通知 -->
	<bean class="com.zking.aop.advice.MethodInterceptor" id="myMethod"></bean>
	<!-- 代理对象=目标+通知 -->
	<bean class="org.springframework.aop.framework.ProxyFactoryBean" id="bookProxy">
		<!-- 目标 -->
		<property name="target" ref="bookBiz"></property>
		<!-- 目标所实现的接口列表 -->
		<property name="proxyInterfaces">
			<list>
				<value>com.zking.aop.biz.BookBiz</value>
			</list>
		</property>
		<!-- 通知:正式调用目标方法的时候，会调用下面指定的通知 -->
		<property name="interceptorNames">
			<list>
				<value>myBefore</value>
				<value>myAfter</value>
				<value>myMethod</value>
				<value>myThrows</value>
			</list>
		</property>
	</bean>
	
</beans>

5、过滤通知

①spring-context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans default-autowire="byName" 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: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/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

	<!-- IOC的主要作用管理整个项目的javabean，依靠依赖注入、控制反转的特点进行管理 -->
	<bean class="com.zking.biz.impl.UserBizImpl1" id="userBiz"></bean>
	<!-- <bean class="com.zking.biz.impl.UserBizImpl2" id="userBiz"></bean> -->
	<!-- set注入 -->
	<bean class="com.zking.web.UserAction" id="userAction">
		<property name="userBiz" ref="userBiz"></property>
		<property name="age" value="22"></property>
		<property name="name" value="zhangsan"></property>
		<property name="hobby">
			<list>
				<value>篮球</value>
				<value>boy</value>
				<value>篮球</value>
			</list>
		</property>
	</bean>
	<!-- 构造注入 -->
	<bean class="com.zking.web.OrderAction" id="orderAction">
		<property name="userBiz" ref="userBiz"></property>
		<constructor-arg name="name" value="zhangsan"></constructor-arg>
		<constructor-arg name="age" value="22"></constructor-arg>
		<constructor-arg name="hobby">
			<list>
				<value>篮球</value>
				<value>boy</value>
				<value>篮球</value>
			</list>
		</constructor-arg>
	</bean>
	
	<!-- 目标对象 -->
	<bean class="com.zking.aop.biz.impl.BookBizImpl" id="bookBiz"></bean>
	<!-- 前置通知 -->
	<bean class="com.zking.aop.advice.MyMethodBeforeAdvice" id="myBefore"></bean>
	<!-- 后置通知 -->
	<bean class="com.zking.aop.advice.MyAfterReturningAdvice" id="myAfter"></bean>
	<bean></bean>
	<!-- 异常通知 -->
	<bean class="com.zking.aop.advice.MyThrowsAdvice" id="myThrows"></bean>
	<!-- 环绕通知 -->
	<bean class="com.zking.aop.advice.MethodInterceptor" id="myMethod"></bean>
	<!-- 过滤通知:给后置通知添加一个过滤功能，只有买书返利，评论不返利 -->
	<bean class="org.springframework.aop.support.RegexpMethodPointcutAdvisor" id="myAfterPlus">
		<property name="advice" ref="myAfter"></property>
		<property name="pattern" value=".*buy"></property>
	</bean>
	<!-- 代理对象=目标+通知 -->
	<bean class="org.springframework.aop.framework.ProxyFactoryBean" id="bookProxy">
		<!-- 目标 -->
		<property name="target" ref="bookBiz"></property>
		<!-- 目标所实现的接口列表 -->
		<property name="proxyInterfaces">
			<list>
				<value>com.zking.aop.biz.BookBiz</value>
			</list>
		</property>
		<!-- 通知:正式调用目标方法的时候，会调用下面指定的通知 -->
		<property name="interceptorNames">
			<list>
				<value>myBefore</value>
				<!-- <value>myAfter</value> -->
				<value>myAfterPlus</value>
				<value>myMethod</value>
				<value>myThrows</value>
			</list>
		</property>
	</bean>
	
</beans>

Demo1

package com.zking.aop.test;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.zking.aop.biz.BookBiz;

public class Demo1 {
	@SuppressWarnings("resource")
	public static void main(String[] args) {
		ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("/spring-context.xml");
//		BookBiz bean = (BookBiz)context.getBean("bookBiz");
		BookBiz bean = (BookBiz)context.getBean("bookProxy");
		bean.buy("bobo", "jpm", 6.6d);
		bean.comment("sfd", "asd");
	}
}

今天的分享就到这啦~~我们下次再见！！！！！