一、基于XML的声明式AspectJ的操作
1、导入相关的jar包
2、在com.itheima.aspectj.xml包下创建MyAspect.java切面类
package com.itheima.aspectj.xml;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
public class MyAspect {
//前置通知֪
public void mybefore(JoinPoint joinpoint){
System.out.print("前置通知：模拟执行权限检查...");
System.out.print("\n");
System.out.print("ִ目标类是："+joinpoint.getTarget());
System.out.print("\n");
System.out.print("执行的相应的切入点是（即执行的方法）："+ joinpoint.getSignature().getName());
System.out.print("\n");
}
//后置通知֪
public void myafterreturning(JoinPoint joinpoint){
System.out.print("后置通知：模拟记录日志");
System.out.print("\n");
System.out.print("执行相应的目标方法是（即切入点）："+ joinpoint.getSignature().getName());
System.out.print("\n");
}
//环绕通知֪
public Object myaround(ProceedingJoinPoint proceedingJoinPoint) throws Throwable{
System.out.print("环绕开始：执行方法之前，模拟开启事务....");
System.out.print("\n");
//ִ执行当前的目标方法
Object obj=proceedingJoinPoint.proceed();
System.out.print("环绕结束：执行目标方法之后，模拟关闭事务....");
System.out.print("\n");
return obj;
}
}
3、在com.demo包下编写业务逻辑层的Dao层，即UserDao.java接口类和相关的UserDaoImpl.java实现类
package com.demo;
public interface UserDao {
public void adduser();
public void deleteuser();
}
package com.demo;
import org.springframework.stereotype.Repository;
public class UserDaoImpl implements UserDao {
public void adduser() {
// TODO Auto-generated method stub
System.out.print("增加用户");
System.out.print("\n");
}
public void deleteuser() {
// TODO Auto-generated method stub
System.out.print("删除用户");
System.out.print("\n");
}
}
4、在src目录下创建ApplicationContext.xml文件，编写相关的配置
5、在com.test中编写test1.java，进行测试相关的面向接口编程（运行结果成功，代表基于XML的声明式AspectJ已经实现了AOP开发）
package com.test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.demo.UserDao;
public class test1 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
ApplicationContext app2=new ClassPathXmlApplicationContext("ApplicationContext.xml");
UserDao userdao=(UserDao)app2.getBean("userdao");
userdao.adduser();
userdao.deleteuser();
}
}
二、基于annotation（注解）的声明式AspectJ的操作
1、导入相关的jar包（同上）
2、在src.com.itheima.aspectj.xml包下创建MyAspect.java切面类
package src.com.itheima.aspectj.xml;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;
@Aspect
@Component
public class MyAspect {
@Pointcut("execution(* src.com.demo.*.*(..))")
private void mypoint(){}
//前置通知֪
@Before("mypoint()")
public void mybefore(JoinPoint joinpoint){
System.out.print("前置通知：模拟执行权限检查...");
System.out.print("\n");
System.out.print("目标类是："+joinpoint.getTarget());
System.out.print("\n");
System.out.print("执行的相应的切入点是（即执行的方法）："+ joinpoint.getSignature().getName());
System.out.print("\n");
}
//后置通知֪
@AfterReturning("mypoint()")
public void myafterreturning(JoinPoint joinpoint){
System.out.print("后置通知：模拟记录日志");
System.out.print("\n");
System.out.print("执行相应的目标方法是（即切入点）："+ joinpoint.getSignature().getName());
System.out.print("\n");
}
//环绕通知֪
@Around("mypoint()")
public Object myaround(ProceedingJoinPoint proceedingJoinPoint) throws Throwable{
System.out.print("环绕开始：执行方法之前，模拟开启事务....");
System.out.print("\n");
//ִ执行相关联的方法
Object obj=proceedingJoinPoint.proceed();
System.out.print("\n");
System.out.print("环绕结束：执行目标方法之后，模拟关闭事务....");
System.out.print("\n");
return obj;
}
}
3、在src.com.demo包下创建UserDao.java的接口类和UserDaoImpl.java的实现类
package src.com.demo;
public interface UserDao {
public void adduser();
public void deleteuser();
}
package src.com.demo;
import org.springframework.stereotype.Repository;
@Repository("userdao")
public class UserDaoImpl implements UserDao {
public void adduser() {
// TODO Auto-generated method stub
System.out.print("增加用户");
System.out.print("\n");
}
public void deleteuser() {
// TODO Auto-generated method stub
System.out.print("删除用户");
System.out.print("\n");
}
}
4、在src目录下创建ApplicationContext.xml文件，编写相关的配置
5、在com.test中编写test1.java，进行测试相关的面向接口编程（运行结果成功，代表基于注解的声明式AspectJ已经实现了AOP开发）
package src.com.test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import src.com.demo.UserDaoImpl;
import src.com.demo.UserDao;
public class test1 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
ApplicationContext app2=new ClassPathXmlApplicationContext("ApplicationContext.xml");
UserDao userdao=(UserDao)app2.getBean("userdao");
userdao.adduser();
}
}