12.如何通过配置使用@AspectJ切面

1 public interface Waiter {
2     void greetTo(String name);
3 
4     void serveTo(String name);
5 }

 1 public class NaiveWaiter implements Waiter {
 2 
 3     public void greetTo(String name) {
 4         System.out.println("greet to " + name + "...");
 5     }
 6 
 7     public void serveTo(String name) {
 8         System.out.println("serving " + name + "...");
 9     }
10 }

1 @Aspect
2 public class PreGreetingAspect {
3     
4     @Before("execution(* greetTo(..))")
5     public void beforeGreeting(){
6         
7         System.out.println("how are you");
8     }
9 }

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
 4     xmlns:context="http://www.springframework.org/schema/context"
 5     xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
 6     xsi:schemaLocation="http://www.springframework.org/schema/beans 
 7        http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
 8        http://www.springframework.org/schema/context 
 9        http://www.springframework.org/schema/context/spring-context-3.1.xsd
10        http://www.springframework.org/schema/tx 
11        http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
12        http://www.springframework.org/schema/aop
13        http://www.springframework.org/schema/aop/spring-aop-3.1.xsd">
14 
15     <!-- 扫描类包下的类 这样Spring定义的注解才能产生作用 如@Resposity @Autowired -->
16     <bean id="waiter" class="com.asm.NaiveWaiter"></bean>
17     <bean class="com.asm.PreGreetingAspect"></bean>
18 
19     <bean
20         class="org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator"></bean>
21 </beans>

 1 package com.asm;
 2 
 3 import org.springframework.context.ApplicationContext;
 4 import org.springframework.context.support.ClassPathXmlApplicationContext;
 5 import org.testng.annotations.Test;
 6 
 7 public class SpringTest1 {
 8     
 9     public static void main(String[] args) {
10         
11         ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
12         Waiter waiter = (Waiter)ctx.getBean("waiter");
13         waiter.greetTo("join");
14         waiter.serveTo("join");
15     }
16 }

基于Schema的配置

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
 4     xmlns:context="http://www.springframework.org/schema/context"
 5     xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
 6     xsi:schemaLocation="http://www.springframework.org/schema/beans 
 7        http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
 8        http://www.springframework.org/schema/context 
 9        http://www.springframework.org/schema/context/spring-context-3.1.xsd
10        http://www.springframework.org/schema/tx 
11        http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
12        http://www.springframework.org/schema/aop
13        http://www.springframework.org/schema/aop/spring-aop-3.1.xsd">
14 
15     <!-- 扫描类包下的类 这样Spring定义的注解才能产生作用 如@Resposity @Autowired -->
16     <bean id="waiter" class="com.asm.NaiveWaiter"></bean>
17     <bean class="com.asm.PreGreetingAspect"></bean>
18     //基于@Aspectj的切面配置
19     <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
20 </beans>

 1 package com.asm;
 2 
 3 import org.springframework.context.ApplicationContext;
 4 import org.springframework.context.support.ClassPathXmlApplicationContext;
 5 import org.testng.annotations.Test;
 6 
 7 public class SpringTest1 {
 8     
 9     public static void main(String[] args) {
10         
11         ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
12         Waiter waiter = (Waiter)ctx.getBean("waiter");
13         waiter.greetTo("join");
14         waiter.serveTo("join");
15     }
16 }

 1 一种方式是使用AspectJ提供的注解:
 2 
 3 package test.mine.spring.bean;
 4 
 5 import org.aspectj.lang.annotation.AfterReturning;
 6 import org.aspectj.lang.annotation.Aspect;
 7 import org.aspectj.lang.annotation.Before;
 8 import org.aspectj.lang.annotation.Pointcut;
 9 @Aspect
10 public class SleepHelper {
11 
12     public SleepHelper(){
13         
14     }
15     
16     @Pointcut("execution(* *.sleep())")
17     public void sleeppoint(){}
18     
19     @Before("sleeppoint()")
20     public void beforeSleep(){
21         System.out.println("睡觉前要脱衣服!");
22     }
23     
24     @AfterReturning("sleeppoint()")
25     public void afterSleep(){
26         System.out.println("睡醒了要穿衣服！");
27     }
28     
29 }
30 
31 用@Aspect的注解来标识切面,注意不要把它漏了，否则Spring创建代理的时候会找不到它,@Pointcut注解指定了切点，@Before和@AfterReturning指定了运行时的通知，注
32 
33 意的是要在注解中传入切点的名称
34 
35 然后我们在Spring配置文件上下点功夫,首先是增加AOP的XML命名空间和声明相关schema
36 命名空间:
37 xmlns:aop="http://www.springframework.org/schema/aop"
38 schema声明:
39 http://www.springframework.org/schema/aop
40 http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
41 
42 然后加上这个标签:
43 <aop:aspectj-autoproxy/> 有了这个Spring就能够自动扫描被@Aspect标注的切面了
44 
45 最后是运行，很简单方便了：
46 public class Test {
47 
48     public static void main(String[] args){
49         ApplicationContext appCtx = new ClassPathXmlApplicationContext("applicationContext.xml");
50         Sleepable human = (Sleepable)appCtx.getBean("human");
51         human.sleep();
52     }
53 }
54 
55 
56 、

posted on 2016-06-20 22:28 Sharpest 阅读(258) 评论(0) 编辑收藏举报