Spring AOP Schema aop:config、tx:advice
本文内容纲要:
- Spring AOP Schema aop:config、tx:advice- 一、 利用aop:config标签实现AOP
- 1. 第一种方法aop:config中配置aop:pointcut和aop:aspect
- 2. 第二种方法aop:config中配置aop:pointcut和aop:advisor
- 二、 AOP中加入事务,引入tx:advice
Spring AOP Schema aop:config、tx:advice
一、 利用aop:config标签实现AOP
首先看个例子,如下
接口代码:
package com.lei.demo.aop.schema;public interface IHello {
public void sayHello();
}
接口实现:
package com.lei.demo.aop.schema;public class HelloService implements IHello {
public void sayHello() {
System.out.println("-----Hello World!-----");
}
}
接下来我们要实现AOP,即调用sayHello方法时切入通知。
1. 第一种方法aop:config中配置aop:pointcut和aop:aspect
定义一个切面支持类HelloAspect.java
package com.lei.demo.aop.schema;/*
* 切面支持类
*/
public class HelloAspect {
//前置通知
public void beforeAdvice() {
System.out.println("===========before advice");
}
//后置最终通知
public void afterFinallyAdvice() {
System.out.println("===========after finally advice");
}
}
Xml配置:Spring-AOP-Schema.xml
<?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"
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">
<!-- 目标类 -->
<bean id="helloService" class="com.lei.demo.aop.schema.HelloService" />
<bean id="helloAspect" class="com.lei.demo.aop.schema.HelloAspect" />
<!-- 配置切面 -->
<!-- aop:advisor,是有顺序的,必须放在aop:pointcut之后 -->
<aop:config>
<aop:pointcut id="helloPointcut" expression="execution(* com.lei.demo.aop.schema..*.*(..))" />
<aop:aspect ref="helloAspect">
<!—以下使用了两种方法定义切入点 pointcut-ref和pointcut-->
<aop:before pointcut-ref="helloPointcut" method="beforeAdvice" />
<aop:after pointcut="execution(* com.lei.demo.aop.schema..*.*(..))" method="afterFinallyAdvice" />
</aop:aspect>
</aop:config>
</beans>
以上配置中method=*"beforeAdvice"**、method="afterFinallyAdvice"*对应helloAspect中的方法
测试,App.java
package com.lei.demo.aop.schema;import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class App {
private static ApplicationContext ctx;
public static void main(String[] args) {
ctx = new ClassPathXmlApplicationContext("Spring-AOP-Schema.xml");
IHello helloService = ctx.getBean("helloService",IHello.class);
helloService.sayHello();
}
}
运行App.java,结果如下:
===========before advice
-----Hello World!-----
===========after finally advice
2. 第二种方法aop:config中配置aop:pointcut和aop:advisor
实现org.aopalliance.intercept.MethodInvocation接口,
HelloAroundAdvice.java如下:
package com.lei.demo.aop.schema;import java.lang.reflect.Method;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
public class HelloAroundAdvice implements MethodInterceptor {
public Object invoke(MethodInvocation arg0) throws Throwable {
System.out.println("++++++before advice");
arg0.proceed();
System.out.println("++++++after advice");
return null;
}
}
Xml配置:Spring-AOP-Schema.xml
<?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"
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">
<!-- 目标类 -->
<bean id="helloService" class="com.lei.demo.aop.schema.HelloService" />
<bean id="helloAspect" class="com.lei.demo.aop.schema.HelloAspect" />
<bean id="helloArroundAdvice" class="com.lei.demo.aop.schema.HelloAroundAdvice" />
<!-- 配置切面 -->
<aop:config>
<aop:pointcut id="helloPointcut" expression="execution(* com.lei.demo.aop.schema..*.*(..))" />
<aop:advisor advice-ref="helloArroundAdvice" pointcut-ref="helloPointcut"/>
</aop:config>
</beans>
仍然运行App.java,结果如下:
++++++before advice
-----Hello World!-----
++++++after advice
二、 AOP中加入事务,引入tx:advice
集成Hibernate时,需要引入事务,以下配置引用Spring 4.0.3和Hibernate 4.3.5
Spring-hibernate.xml如下:
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
">
<!-- Hibernate4 -->
<!-- 加载资源文件 其中包含变量信息,必须在Spring配置文件的最前面加载,即第一个加载-->
<context:property-placeholder location="classpath:persistence-mysql.properties" />
<bean id="sessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="packagesToScan">
<list>
<!-- 可以加多个包 -->
<value>com.lei.demo.entity</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop>
<prop key="hibernate.dialect">${hibernate.dialect}</prop>
<prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
</props>
</property>
</bean>
<!-- 数据库映射 -->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${jdbc.driverClassName}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.user}" />
<property name="password" value="${jdbc.pass}" />
</bean>
<!-- 配置Hibernate事务管理器 -->
<bean id="transactionManager"
class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
<!-- 配置事务异常封装 -->
<bean id="persistenceExceptionTranslationPostProcessor"
class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" />
<!-- 声明式容器事务管理 ,transaction-manager指定事务管理器为transactionManager-->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="add*" propagation="REQUIRED" />
<tx:method name="get*" propagation="REQUIRED" />
<tx:method name="*" read-only="true" />
</tx:attributes>
</tx:advice>
<aop:config expose-proxy="true">
<!-- 只对业务逻辑层实施事务 -->
<aop:pointcut id="txPointcut" expression="execution(* com.lei.demo.service..*.*(..))" />
<!-- Advisor定义,切入点和通知分别为txPointcut、txAdvice -->
<aop:advisor pointcut-ref="txPointcut" advice-ref="txAdvice"/>
</aop:config>
</beans>
重点看一下tx:advice的配置
<tx:advice id="txAdvice" transaction-manager="transactionManager"> <tx:attributes>
<tx:method name="add*" propagation="REQUIRED" />
<tx:method name="get*" propagation="REQUIRED" />
<tx:method name="*" read-only="true" />
</tx:attributes>
</tx:advice>
意思是说,这个事务advice的管理者为transactionManager,而这个advice中规定了匹配add*、get*方法的传输方式为required,也就是说没有sessionFactory的时候会自动建立,有的时候就不会建立了。当然这只是规定了一个advice,你还需要指定一个aop:pointcut去引用它,例如下边的aop:config配置节。这样,这个advice就被织入到txPointcut这个pointcut上了。
本文内容总结:Spring AOP Schema aop:config、tx:advice,一、 利用aop:config标签实现AOP,1. 第一种方法aop:config中配置aop:pointcut和aop:aspect,2. 第二种方法aop:config中配置aop:pointcut和aop:advisor,二、 AOP中加入事务,引入tx:advice,
原文链接:https://www.cnblogs.com/leiOOlei/p/3709607.html
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