采用Annotation实现AOP

导入spring库文件
1. spring-framework-2.0\dist\spring.jar
2. spring-framework-2.0\lib\jakarta-commons\commons-logging.jar
3. spring-framework-2.0\lib\log4j\log4j-1.2.14.jar
4. spring-framework-2.0\lib\aspectj\*.jar

采用@Aspect定义切面

/**
 * 定义Aspect
 * @author Administrator
 *
 */
@Aspect
public class SecurityHandler {
	
	/**
	 * 定义Pointcut，Pointcut的名称就是allAddMethod
	 * 此方法不能有返回值和参数，此方法只是一个标识
	 * Pointcut中是个表达式，表示那些方法（订阅JoinPoint）
	 */
	@Pointcut("execution(* add*(..))|| execution(* del*(..))")
	private void allAddMethod(){};
	
	@Before("allAddMethod()")
	private void chechSecurity(){
		System.out.println("---------chechSecurity----------");
	}

}

在配置文件中启用Aspectj对Annotation的支持

<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"
	     xmlns:tx="http://www.springframework.org/schema/tx"
	     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">
	<aop:aspectj-autoproxy/>
	<bean id="SecurityHandler" class="com.twh.spring.SecurityHandler"/>
	<bean id="UserManagerImpl" class="com.twh.spring.UserManagerImpl"/>
</beans>

目标类的接口

public interface UserManager {
	
	public void addUser(String username,String password);
	
	public void deleteUser(int id);
	
	public void modifyUser(int id,String username,String password);
	
	public String findUserById(int id);

}

目标类

public class UserManagerImpl implements UserManager {

	public void addUser(String username, String password) {
		System.out.println("---------addUser----------");
	}

	public void deleteUser(int id) {
		System.out.println("---------deleteUser----------");
	}

	public String findUserById(int id) {
		System.out.println("---------findUserById----------");
		return null;
	}

	public void modifyUser(int id, String username, String password) {
		System.out.println("---------modifyUser----------");
	}
}

客户端访问：

public class Client {
	
	public static void main(String[] args){
		BeanFactory bf = new ClassPathXmlApplicationContext("applicationContext.xml");
		
		UserManager um = (UserManager)bf.getBean("UserManagerImpl");
		
		um.addUser("aaaa", "213213");
		um.deleteUser(123);
	}

}