Spring中实现AOP 迎客

AspectJ介绍：

AspectJ是一个面向切面的框架，它扩展了Java语言。

AspectJ定义了AOP语法所以它有一个专门的编译器用来生成遵守Java字节编码规范的Class文件.

Spring 可以使用了和AspectJ 5一样的注解，并使用AspectJ来做切入点解析和匹配。

但是，AOP在运行时仍旧是纯的Spring AOP，并不依赖于AspectJ的编译器或者织入器（weaver）。

aspectJ下载：http://www.eclipse.org/aspectj/downloads.php

采用AspectJ声明实现AOP：

接口UserManager.java:

1 package com.springdemo.manager;
2 
3  public interface UserManager {
4     public void add(String name,String password);
5     public void delete(String name);
6     public int count();
7 }
8

类UserManagerImpl.java:

代码

 1 package com.springdemo.manager;
 2 
 3 
 4  public class UserManagerImpl implements UserManager {
 5 
 6     public void add(String name, String password) {
 7         System.out.println(" do add user ... ");        
 8     }
 9 
10     public void delete(String name) {
11         System.out.println(" do delete user ... ");        
12     }
13 
14     public int count() {
15         return 10;
16     }
17 }
18

切面UserManagerHandler.java:

代码

 1 package com.springdemo.manager;
 2 
 3  import org.aspectj.lang.annotation.Aspect;
 4  import org.aspectj.lang.annotation.Before;
 5  import org.aspectj.lang.annotation.Pointcut;
 6 
 7 @Aspect
 8  public class UserManagerHandler {
 9 
10     /**
11      * PointCut名，不能有返回值
12      */
13     @Pointcut("execution(* *.*(..))")
14     public void pointCutMethods(){}
15     
16     /**
17      * 定义Advice
18      */
19     @Before("pointCutMethods()")
20     public void checkPower() {
21         System.out.println("check manager power ....");
22     } 
23 }
24

bean.xml:

代码

 1 <beans xmlns="http://www.springframework.org/schema/beans"
 2     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
 3     xmlns:util="http://www.springframework.org/schema/util"
 4     xmlns:aop="http://www.springframework.org/schema/aop"
 5     xsi:schemaLocation="http://www.springframework.org/schema/beans
 6          http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
 7          http://www.springframework.org/schema/context
 8          http://www.springframework.org/schema/context/spring-context-3.0.xsd
 9          http://www.springframework.org/schema/util
10         http://www.springframework.org/schema/util/spring-util-3.0.xsd
11         http://www.springframework.org/schema/aop
12         http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
13 
14 
15     <aop:aspectj-autoproxy/>
16     <bean id="UserManagerHandler" class="com.springdemo.manager.UserManagerHandler"/>
17     <bean id="UserManagerImpl" class="com.springdemo.manager.UserManagerImpl"/>
18 </beans>
19

测试代码：

代码

 1 package com.springdemo.client;
 2 
 3 import org.springframework.beans.factory.BeanFactory;
 4 import org.springframework.context.support.ClassPathXmlApplicationContext;
 5 import com.springdemo.manager.UserManager;
 6 
 7 public class Client {
 8     public static void main(String[] args) {
 9         //Resource res = new ClassPathResource("bean.xml");
10         //BeanFactory fac = new XmlBeanFactory(res);
11         BeanFactory fac = new ClassPathXmlApplicationContext("bean.xml");       
12         UserManager userManager = (UserManager)fac.getBean("UserManagerImpl");
13         userManager.add("pxl..", "pwd..");
14     }
15 
16 }
17

基于Schema的AOP实现：

UserManager.java 和 UserManagerImpl.java 代码同上。

切面UserManagerHandler.java：

1 package com.springdemo.manager;
2  public class UserManagerHandler {
3     public void checkPower() {
4         System.out.println("check manager power ....");
5     } 
6 }

配置Spring容器bean.xml：

代码

 1 <beans xmlns="http://www.springframework.org/schema/beans"
 2     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
 3     xmlns:util="http://www.springframework.org/schema/util"
 4     xmlns:aop="http://www.springframework.org/schema/aop"
 5     xsi:schemaLocation="http://www.springframework.org/schema/beans
 6          http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
 7          http://www.springframework.org/schema/context
 8          http://www.springframework.org/schema/context/spring-context-3.0.xsd
 9          http://www.springframework.org/schema/util
10          http://www.springframework.org/schema/util/spring-util-3.0.xsd
11         http://www.springframework.org/schema/aop
12         http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
13 
14     <bean id="UserManagerHandler" class="com.springdemo.manager.UserManagerHandler"/>
15     <bean id="UserManagerImpl" class="com.springdemo.manager.UserManagerImpl"/>
16     
17     <aop:config>
18         <aop:aspect id="UserMangerAspect" ref="UserManagerHandler">
19             <aop:pointcut expression="execution(* *.*(..))" id="pointCutMethods"/>
20             <aop:before method="checkPower" pointcut-ref="pointCutMethods" />
21         </aop:aspect>
22     </aop:config>
23 </beans>

测试代码：

代码

 1 package com.springdemo.client;
 2 
 3 import org.springframework.beans.factory.BeanFactory;
 4 import org.springframework.context.support.ClassPathXmlApplicationContext;
 5 
 6 import com.springdemo.manager.UserManager;
 7 
 8 public class Client {
 9     public static void main(String[] args) {
10         //Resource res = new ClassPathResource("bean.xml");
11         //BeanFactory fac = new XmlBeanFactory(res);
12         BeanFactory fac = new ClassPathXmlApplicationContext("bean.xml");       
13         UserManager userManager = (UserManager)fac.getBean("UserManagerImpl");
14         userManager.add("pxl..", "pwd..");
15     }
16 
17 }