大数据正式30

课程回顾

• AOP
  • AOP概念：面向切面编程
  • 连接点：目标方法
  • 切入点：规则（Expression），满足表达式的方法才称之为切入点
  • 切面：类 （事务、权限、异常）
  • 通知：额外的方法

今天：表达式

• 切入点的Execution表达式

  execution（modifiers-pattern? ret-type-pattern declaring-type-pattern? name-pattern（param-pattern） throws-pattern?）

modifiers-pattern ?ret-type-patterndeclaring-type-pattern?name-pattern（param-pattern）throws-pattern ?修饰符
(可有可无)返回值全类名
(可有可无)方法名参数列表抛出异常
(可有可无)

• 例
  • 任意公共方法的执行：

    execution（public * *（..））

  • 任何一个名字以“set”开始的方法的执行：

    execution（* set*（..））

  • AccountService接口定义的任意方法的执行：

    execution（* com.xyz.service.AccountService.*（..））

  • 在service包中定义的任意方法的执行：

    execution（* com.xyz.service.*.*（..））

  • 在service包或其子包中定义的任意方法的执行：

    execution（* com.xyz.service..*.*（..））

• 注：xxx..yyy xxx开头yyy结尾即可，中间随便

五大通知

1. 环绕通知around
2. 前置通知before
   1. 事务开始
3. 后置通知after-returning
   1. 事务的提交
   2. 有异常它不执行
4. 异常通知after-throwing
   1. JoinPoint必须放在Throwable前面（Error：：0）
   2. 事务回滚
5. 最终通知after

环绕通知的嵌套

• 

例子

• 正常的通知（关键代码）

  • 切面类

    package com.peng.aspect;import org.aspectj.lang.JoinPoint;import org.aspectj.lang.ProceedingJoinPoint;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Qualifier;import org.springframework.stereotype.Component;import com.peng.manager.Manager;/** * 切面 *  * @author Administrator *  */@Component(value = "txaspect")public class TxAspect {    @Autowired    @Qualifier(value = "manager")    Manager manager;    // 前置通知    public void before(JoinPoint jp) {        System.out.println("前置通知类：" + jp.getTarget().getClass());        System.out.println("前置通知方法：" + jp.getSignature().getName());    }    // 环绕通知    public Object around(ProceedingJoinPoint joinPoint) throws Throwable {        manager.start();// 开始事务        // 执行目标方法        System.out.println("asdfghj");        Object result = joinPoint.proceed();        System.out.println("asdfghj");        manager.commit();// 提交事务        return result;    }    // 后置通知    public void after_returning(JoinPoint jp) {        System.out.println("后置通知类：" + jp.getTarget().getClass());        System.out.println("后置通知方法：" + jp.getSignature().getName());    }    // 异常通知    public void throwable(JoinPoint jp, Throwable tw) {        System.out.println("异常通知类：" + jp.getTarget().getClass());        System.out.println("异常通知方法：" + jp.getSignature().getName());        System.out.println("异常类型：" + tw.getClass());        System.out.println("异常信息：" + tw.getMessage());    }    // 最终通知    public void after(JoinPoint jp) {        System.out.println("最终通知类：" + jp.getTarget().getClass());        System.out.println("最终通知方法：" + jp.getSignature().getName());    }}

  • service层的业务逻辑

    package com.peng.service;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Qualifier;import org.springframework.stereotype.Service;import com.peng.dao.PersonDao;import com.peng.pojo.Person;@Service(value = "serviceImpl")public class PersonServiceImpl implements PersonService {    @Autowired    @Qualifier(value = "personDao")    private PersonDao dao;    @Override    public void savePerson(Person p) {        if (null != dao) {            // int a = 1 / 0;//异常通知实验            dao.savePerson(p);        }    }}

  • 配置文件

    <?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"    xmlns:context="http://www.springframework.org/schema/context"    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd">    <!-- 开启包扫描 -->    <context:component-scan base-package="com.peng"></context:component-scan>    <!-- 开启注解开关 -->    <context:annotation-config></context:annotation-config>    <aop:config>        <!-- 切入点(规则:其实就是个路径) -->        <aop:pointcut expression="execution(* com.peng.service.*.*(..))"            id="pc" />        <!-- 配置切面 -->        <aop:aspect ref="txaspect">            <!-- 方法 通知 -->            <aop:before method="before" pointcut-ref="pc" />            <aop:around method="around" pointcut-ref="pc" />            <aop:after-returning method="after_returning"                pointcut-ref="pc" />            <aop:after-throwing method="throwable" throwing="tw"                pointcut-ref="pc" />            <aop:after method="after" pointcut-ref="pc" />        </aop:aspect>    </aop:config></beans>

  • 执行效果

    十二月 22, 2017 10:59:26 上午 org.springframework.context.support.AbstractApplicationContext prepareRefreshINFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@873b9f: startup date [Fri Dec 22 10:59:26 CST 2017]; root of context hierarchy十二月 22, 2017 10:59:26 上午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitionsINFO: Loading XML bean definitions from class path resource [applicationContext.xml]十二月 22, 2017 10:59:28 上午 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletonsINFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@9ea162: defining beans [txaspect,personDao,manager,person,serviceImpl,serviceImpl2,personServlet,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,org.springframework.aop.config.internalAutoProxyCreator,pc,org.springframework.aop.aspectj.AspectJPointcutAdvisor#0,org.springframework.aop.aspectj.AspectJPointcutAdvisor#1,org.springframework.aop.aspectj.AspectJPointcutAdvisor#2,org.springframework.aop.aspectj.AspectJPointcutAdvisor#3,org.springframework.aop.aspectj.AspectJPointcutAdvisor#4,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor]; root of factory hierarchy=================懒加载在此之后=============================构造函数================Person=====init==========前置通知类：class com.peng.service.PersonServiceImpl前置通知方法：savePersonstart................asdfghj保存了~~名称：张三，年龄：12asdfghjcommit................后置通知类：class com.peng.service.PersonServiceImpl后置通知方法：savePerson最终通知类：class com.peng.service.PersonServiceImpl最终通知方法：savePerson十二月 22, 2017 10:59:28 上午 org.springframework.context.support.AbstractApplicationContext doCloseINFO: Closing org.springframework.context.support.ClassPathXmlApplicationContext@873b9f: startup date [Fri Dec 22 10:59:26 CST 2017]; root of context hierarchy十二月 22, 2017 10:59:28 上午 org.springframework.beans.factory.support.DefaultSingletonBeanRegistry destroySingletonsINFO: Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@9ea162: defining beans [txaspect,personDao,manager,person,serviceImpl,serviceImpl2,personServlet,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,org.springframework.aop.config.internalAutoProxyCreator,pc,org.springframework.aop.aspectj.AspectJPointcutAdvisor#0,org.springframework.aop.aspectj.AspectJPointcutAdvisor#1,org.springframework.aop.aspectj.AspectJPointcutAdvisor#2,org.springframework.aop.aspectj.AspectJPointcutAdvisor#3,org.springframework.aop.aspectj.AspectJPointcutAdvisor#4,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor]; root of factory hierarchy=====Person=====destory==========

• 有异常的通知

  • 切面类

    package com.peng.aspect;import org.aspectj.lang.JoinPoint;import org.aspectj.lang.ProceedingJoinPoint;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Qualifier;import org.springframework.stereotype.Component;import com.peng.manager.Manager;/** * 切面 *  * @author Administrator *  */@Component(value = "txaspect")public class TxAspect {    @Autowired    @Qualifier(value = "manager")    Manager manager;    // 前置通知    public void before(JoinPoint jp) {        System.out.println("前置通知类：" + jp.getTarget().getClass());        System.out.println("前置通知方法：" + jp.getSignature().getName());    }    // 环绕通知    public Object around(ProceedingJoinPoint joinPoint) throws Throwable {        manager.start();// 开始事务        // 执行目标方法        System.out.println("asdfghj");        Object result = joinPoint.proceed();        System.out.println("asdfghj");        manager.commit();// 提交事务        return result;    }    // 后置通知    public void after_returning(JoinPoint jp) {        System.out.println("后置通知类：" + jp.getTarget().getClass());        System.out.println("后置通知方法：" + jp.getSignature().getName());    }    // 异常通知    public void throwable(JoinPoint jp, Throwable tw) {        System.out.println("异常通知类：" + jp.getTarget().getClass());        System.out.println("异常通知方法：" + jp.getSignature().getName());        System.out.println("异常类型：" + tw.getClass());        System.out.println("异常信息：" + tw.getMessage());    }    // 最终通知    public void after(JoinPoint jp) {        System.out.println("最终通知类：" + jp.getTarget().getClass());        System.out.println("最终通知方法：" + jp.getSignature().getName());    }}

  • service层的业务逻辑

    package com.peng.service;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Qualifier;import org.springframework.stereotype.Service;import com.peng.dao.PersonDao;import com.peng.pojo.Person;@Service(value = "serviceImpl")public class PersonServiceImpl implements PersonService {    @Autowired    @Qualifier(value = "personDao")    private PersonDao dao;    @Override    public void savePerson(Person p) {        if (null != dao) {            int a = 1 / 0;//异常通知实验            dao.savePerson(p);        }    }}

  • 配置文件

    <?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"    xmlns:context="http://www.springframework.org/schema/context"    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd">    <!-- 开启包扫描 -->    <context:component-scan base-package="com.peng"></context:component-scan>    <!-- 开启注解开关 -->    <context:annotation-config></context:annotation-config>    <aop:config>        <!-- 切入点(规则:其实就是个路径) -->        <aop:pointcut expression="execution(* com.peng.service.*.*(..))"            id="pc" />        <!-- 配置切面 -->        <aop:aspect ref="txaspect">            <!-- 方法 通知 -->            <aop:before method="before" pointcut-ref="pc" />            <aop:around method="around" pointcut-ref="pc" />            <aop:after-returning method="after_returning"                pointcut-ref="pc" />            <aop:after-throwing method="throwable" throwing="tw"                pointcut-ref="pc" />            <aop:after method="after" pointcut-ref="pc" />        </aop:aspect>    </aop:config></beans>

  • 执行效果

    十二月 22, 2017 11:01:30 上午 org.springframework.context.support.AbstractApplicationContext prepareRefreshINFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@873b9f: startup date [Fri Dec 22 11:01:30 CST 2017]; root of context hierarchy十二月 22, 2017 11:01:30 上午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitionsINFO: Loading XML bean definitions from class path resource [applicationContext.xml]十二月 22, 2017 11:01:31 上午 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletonsINFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@7561aa: defining beans [txaspect,personDao,manager,person,serviceImpl,serviceImpl2,personServlet,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,org.springframework.aop.config.internalAutoProxyCreator,pc,org.springframework.aop.aspectj.AspectJPointcutAdvisor#0,org.springframework.aop.aspectj.AspectJPointcutAdvisor#1,org.springframework.aop.aspectj.AspectJPointcutAdvisor#2,org.springframework.aop.aspectj.AspectJPointcutAdvisor#3,org.springframework.aop.aspectj.AspectJPointcutAdvisor#4,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor]; root of factory hierarchy=================懒加载在此之后=============================构造函数================Person=====init==========前置通知类：class com.peng.service.PersonServiceImpl前置通知方法：savePersonstart................asdfghj异常通知类：class com.peng.service.PersonServiceImpl异常通知方法：savePerson异常类型：class java.lang.ArithmeticException异常信息：/ by zero最终通知类：class com.peng.service.PersonServiceImpl最终通知方法：savePerson

AOP的注解形式

• 切面类

  package com.peng.aspect;import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.Around;import org.aspectj.lang.annotation.Aspect;import org.aspectj.lang.annotation.Before;import org.aspectj.lang.annotation.Pointcut;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Qualifier;import org.springframework.stereotype.Component;import com.peng.manager.Manager;/** * 切面 *  * @author Administrator *  */@Component@Aspectpublic class TxAspect {    @Autowired    @Qualifier(value = "manager")    Manager manager;    // /创建一个切入点表达式的引用    @Pointcut("within(com.peng.service.*)")    public void pc() {    }    // 此方法当代理对象执行方法的时候去执行---------连接点    @Around(value = "pc()")    public Object around(ProceedingJoinPoint joinPoint) throws Throwable {        manager.start();// 开始事务        // 执行目标方法        Object result = joinPoint.proceed();        manager.commit();// 提交事务        return result;    }}

• 配置文件

  <?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"    xmlns:context="http://www.springframework.org/schema/context"    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd">    <!-- 开启包扫描 -->    <context:component-scan base-package="com.peng"></context:component-scan>    <!-- 开启注解开关 -->    <context:annotation-config>    </context:annotation-config>    <!-- aop注解开关 -->    <aop:aspectj-autoproxy></aop:aspectj-autoproxy></beans>

自定义注解

• 方便自己来更好的控制
• 步骤
  • 声明注解
    • 
  • 使用注解
    • 
  • 判断注解
    • 
• 使用前景
  • 事务
  • 安全
  • 。。。

• 例子

  • 自定义注解

    package com.peng.create;import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;@Target(ElementType.METHOD)// 注解类型--方法@Retention(RetentionPolicy.RUNTIME)// 时间点--运行时public @interface Transication {    // 参数声明    String value() default "small";// 有default可以不用写，没有default必须写--------------具体用到的注解中}

  • service层

    package com.peng.service;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Qualifier;import org.springframework.stereotype.Service;import com.peng.create.Transication;import com.peng.dao.PersonDao;import com.peng.pojo.Person;@Service(value = "serviceImpl")public class PersonServiceImpl implements PersonService {    @Autowired    @Qualifier(value = "personDao")    private PersonDao dao;    @Override    @Transication(value = "save")    public void savePerson(Person p) {        if (null != dao) {            dao.savePerson(p);        }    }}

  • 切面

    package com.peng.aspect;import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.Around;import org.aspectj.lang.annotation.Aspect;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Qualifier;import org.springframework.stereotype.Component;import com.peng.create.Transication;import com.peng.manager.Manager;/** * 切面 *  * @author Administrator *  */@Component@Aspectpublic class TxAspect {    @Autowired    @Qualifier(value = "manager")    Manager manager;    // /创建一个切入点表达式的引用    // 此方法当代理对象执行方法的时候去执行---------连接点    @Around(value = "within(com.peng.service.*) && @annotation(ts)")    public Object around(ProceedingJoinPoint joinPoint, Transication ts)            throws Throwable {        System.out.println(ts.value());        // TODO权限        // 获取用户的权限        // 获取注解中的权限--权限类（静态list）        // 判断当前用户中是否有该权限，并执行相应的操作        manager.start();// 开始事务        // 执行目标方法        Object result = joinPoint.proceed();        manager.commit();// 提交事务        return result;    }}

  • 配置文件

    <?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"    xmlns:context="http://www.springframework.org/schema/context"    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd">    <!-- 开启包扫描 -->    <context:component-scan base-package="com.peng"></context:component-scan>    <!-- 开启注解开关 -->    <context:annotation-config>    </context:annotation-config>    <!-- aop注解开关 -->    <aop:aspectj-autoproxy></aop:aspectj-autoproxy></beans>