xml的方式配置AOP:Aspect Oriented Programming

小程序：扫一扫查出行
【扫一扫了解最新限行尾号】
复制小程序

在某些类中, 什么时机, 做什么事情
切入点(point-cut): 在某些类中(Class<?>[] itfc = new Class<?>[] { IStudentService.class })
通知: 什么时机, 做什么事情(InvocationHandler的invoke方法)
切面: 切入点 + 通知
织入(weaver): Proxy.newProxyInstance: 把切入点和通知施加到具体的业务逻辑上的过程

XML配置AOP步骤:
1,准备了一个实现接口的bean, 还有一个事务的碎片化方法的类;
2,把这两个类配置到Spring容器中;
3,配置springAOP
1)引入aop命名空间;
2)配置AOP,格式如下
<aop:config>
      <aop:point-cut expression="" id="sample" />
      <aop:aspect ref="">
           <aop:before method="" pointcut-ref="sample">
           <aop:after-returning method="" pointcut-ref="sample">
           <aop:after-throwing method="" pointcut-ref="sample">
      </aop:aspect>
</aop:config>
1] aop:config: AOP配置
2] aop:point-cut: AOP切入点
3] aop:aspect: AOP切面配置
4] aop:* 都是一个AOP切面

4,在接口文件中配置一个业务逻辑对象的接口,DI注入,并在test方法中直接调用该接口的具体业务逻辑

//接口:
package com.xk.spring.kp04_aop.aop.s01_xml;public interface IStudentService {
public void save(Student stu);
public void update(Student stu);
}

//Dao 实现类(service) 实现业务逻辑
package com.xk.spring.kp04_aop.aop.s01_xml;public class StudentServiceImpl implements IStudentService {
@Override
public void save(Student stu) {
System.out.println("调用Dao的save方法....");
}
@Override
public void update(Student stu) {
System.out.println("调用Dao的update方法...");
@SuppressWarnings("unused")
int i = 10/0;
}
}

//事物管理:将代码中的污染源抽出一个类,专门处理事物
package com.xk.spring.kp04_aop.aop.s01_xml;public class TransactionManager {
/**
* 事物开始
*/
public void begin(){
System.out.println("TransactionManager.begin()");
}
/**
* 事物提交
*/
public void commit(){
System.out.println("TransactionManager.commit()");
}
/**
* 事物回滚
*/
public void rollback(Throwable e){
System.out.println("TransactionManager.rollback()");
System.out.println("rollback()");
} /**
* 事物结束
*/
public void finished(){
System.out.println("TransactionManager.close()");
}
}

//Bean
//将bean注入就是指将数据注入Spring
package com.xk.spring.kp04_aop.aop.s01_xml;public class Student {
private String name;
private Integer age;public Student() {}public Student(String name, Integer age) {
this.name = name;
this.age = age;
}public String getName() {
return name;
}public void setName(String name) {
this.name = name;
}public Integer getAge() {
return age;
}public void setAge(Integer age) {
this.age = age;
}@Override
public String toString() {
return "Student [name=" + name + ", age=" + age + "]";
}
}

//测试类
package com.xk.spring.kp04_aop.aop.s01_xml;import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration
public class AOPXMLTest {
@Autowired
IStudentService seriver; @Test
public void testAOPXML() throws Exception {
seriver.save(new Student("张三", 18));
seriver.update(new Student("张4", 18));
}
}

<?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.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd"> <bean id="service" class="com.xk.spring.kp04_aop.aop.s01_xml.StudentServiceImpl" />
<bean id="manager" class="com.xk.spring.kp04_aop.aop.s01_xml.TransactionManager" />
<aop:config>

<aop:pointcut
expression="execution(* com.xk.spring.kp04_aop.aop.s01_xml.*Service.*(..))"
id="stuService" />
<aop:aspect ref="manager">
<aop:before method="begin" pointcut-ref="stuService" />

<aop:after-throwing method="rollback"
pointcut-ref="stuService" throwing="e" />
</aop:aspect>
</aop:config>
</beans>