Spring对AOP的实现提供了很好的支持。下面我们就使用Spring的注解来完成AOP做一个例子。
首先，为了使用Spring的AOP注解功能，必须导入如下几个包。aspectjrt.jar,aspectjweaver.jar,cglib-nodep.jar.
1、实体bean
public class Person {
private Long id;
private String name;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
2、接口类
public interface PersonService {
public void save(Person person);
public void update(Person person);
public Person getByIdPerson(Long id);
public void delete(Long id);
}
3、实现类
public class PersonServiceImpl implements PersonService{
Map<Long, Person> maps = new HashMap<Long, Person>();
@Override
public void save(Person person) {
System.out.println("***执行save方法***");
maps.put(person.getId(), person);
}
@Override
public void update(Person person) {
System.out.println("***执行update()方法***");
maps.remove(person.getId());
maps.put(person.getId(), person);
}
@Override
public Person getByIdPerson(Long id) {
System.out.println("***执行getByIdPerson()方法***");
return maps.get(id);
}
@Override
public void delete(Long id) {
System.out.println("***执行delete()方法***");
maps.remove(id);
}
}
4、定义Aspect
public class MyInterceptor {
/**在核心业务执行前执行，不能阻止核心业务的调用*/
public void doBefore(JoinPoint joinPoint) {
//可通过joinPoint来获取所需要的内容
Object[] objects = joinPoint.getArgs();
Person person = (Person) objects[0];
System.out.println("前置通知:"+person.getName());
}
/** 核心业务逻辑退出后（包括正常执行结束和异常退出），执行此Advice @param joinPoint */
public void doAfter(JoinPoint joinPoint) {
System.out.println("最终通知");
}
/**
* 核心业务逻辑调用正常退出后，不管是否有返回值，正常退出后，均执行此Advice
* @param joinPoint
*/
public void doAfterReturning(JoinPoint joinPoint) {
System.out.println("后置通知");
}
/**异常通知*/
public void doAfterThrowing(Throwable ex) {
System.out.println("异常通知："+ex.getMessage());
}
/**环绕通知*/
public Object doAround(ProceedingJoinPoint pjp) throws Throwable {
System.out.println("进入环绕通知");
Object object = pjp.proceed();//执行该方法
System.out.println("退出方法");
return object;
}
}
5、在Spring的XML配置文件中配置AOP
<?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:tx="http://www.springframework.org/schema/tx"
xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
<context:annotation-config />
<context:component-scan base-package="cn.tzz.aop.annotation" />
<!--AOP 注解 -->
<aop:aspectj-autoproxy proxy-target-class="true" />
<bean id="personService" class="cn.tzz.aop.annotation.service.impl.PersonServiceImpl"></bean>
<bean id="myInterceptor" class="cn.tzz.aop.annotation.MyInterceptor"></bean>
<!--XML 注解 -->
<bean id="personXmlService" class="cn.tzz.aop.xml.service.impl.PersonServiceImpl"></bean>
<bean id="myXmlInterceptor" class="cn.tzz.aop.xml.MyInterceptor"></bean>
<aop:config>
<aop:aspect id="aspect" ref="myXmlInterceptor">
<!--定义切点 -->
<aop:pointcut id="myPoint" expression="execution(* cn.tzz.aop.xml.
service.impl..*.*(..))"/>
<aop:before method="doBefore" arg-names="person" pointcut-ref="myPoint"/>
<aop:after method="doAfter" pointcut-ref="myPoint"/>
<aop:after-returning method="doAfterReturning" pointcut-ref="myPoint"/>
<aop:after-throwing method="doAfterThrowing" throwing="ex"
pointcut-ref="myPoint"/>
<aop:around method="doAround" pointcut-ref="myPoint"/>
</aop:aspect>
</aop:config>
</beans>
6、测试
public class TestAop {
private static ApplicationContext ctx = null;
private static PersonService personService = null;
static{
ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
personService = (PersonService)ctx.getBean("personXmlService");
}
public void testSave(){
Person person = new Person();
person.setId(1L);
person.setName("abc");
personService.save(person);
}
public void testGetByIdPerson(){
Person p = personService.getByIdPerson(1L);
System.out.println(p.getId()+"---"+p.getName());
}
public void testUpdate(){
Person person = new Person();
person.setId(1L);
person.setName("abc_1");
personService.update(person);
}
public void testDelete(){
personService.delete(1L);
}
@Test
public void testInteceptor(){
testSave();
// testGetByIdPerson();
// testUpdate();
// testGetByIdPerson();
// testDelete();
// testGetByIdPerson();
}
}
7、测试结果
前置通知:abc 进入环绕通知 ***执行save方法*** 最终通知 后置通知 退出方法
扫描二维码关注公众号，回复：
833804 查看本文章
