项目结构：

 

 

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切面类：

package edu.nf.ch12.service.aspect;import org.aspectj.lang.JoinPoint;import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.*;import org.springframework.stereotype.Component;/** * @author wangl * @date 2018/10/24 */@Aspect //这个注解标识当前的类为一个切面@Component //标识容器受管的Bean对象public class UserServiceAspect {    /**     * 声明一个切入点,并编写切入点表达式     */    @Pointcut("execution(* edu.nf.ch12.service.*.*(..))")    public void pointcut(){    }    /**     * 前置通知,指定切入点函数     * 也可在注解中自定义不同的切入点表达式     * @Before("execution(...)")     *     */    @Before("pointcut()")    public void before(JoinPoint joinPoint){        System.out.println("前置通知..."+joinPoint.getArgs()[0]);    }    /**     * 后置通知     */    @AfterReturning(value = "pointcut()", returning = "returnVal")    public void afterReturn(String returnVal){        System.out.println("后置通知..." + returnVal);    }    /**     * 环绕通知     */    @Around("pointcut()")    public Object around(ProceedingJoinPoint pjp) throws Throwable {        System.out.println("环绕通知前...");        Object returnVal = pjp.proceed();        System.out.println("环绕通知后...");        return returnVal;    }    /**     * 异常通知     * 通过pointcut指定切入点     */    @AfterThrowing(pointcut = "pointcut()", throwing = "e")    public void throwableAdvice(Throwable e){        System.out.println("异常通知..." + e.getMessage());    }    /**     * 最终通知     */    @After("pointcut()")    public void after(){        System.out.println("最终通知...");    }}

配置类AppConfig：

package edu.nf.ch12.service.config;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.EnableAspectJAutoProxy;/** * @author wangl * @date 2018/10/24 */@ComponentScan("edu.nf.ch12") //启用包扫描@EnableAspectJAutoProxy //启用AspectJ注解自动配置,proxyTargetClass用于指定是否强制使用cglib代理public class AppConfig {}

接口类：

package edu.nf.ch12.service;/** * @author wangl * @date 2018/10/24 */public interface UserService {    /**     * 查询用户     * @param uid     * @return     */    String getUserNameById(String uid);}

接口实现类：

package edu.nf.ch12.service.impl;import edu.nf.ch12.service.UserService;import org.springframework.stereotype.Service;/** * @author wangl * @date 2018/10/24 */@Service("userService")public class UserServiceImpl implements UserService {    @Override    public String getUserNameById(String uid) {        System.out.println("查询用户..."+uid);        return "user1";    }}

程序测试类：

package edu.nf.ch12.test;import edu.nf.ch12.service.UserService;import edu.nf.ch12.service.config.AppConfig;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.annotation.AnnotationConfigApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;/** * @author wangl * @date 2018/10/24 */public class UserServiceTest {    @Test    public void testGetUser(){        //ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");        ApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class);        UserService service = context.getBean("userService", UserService.class);        service.getUserNameById("1001");    }}

如果半注解半配置文件实现的话， new ClassPathXmlApplicationContext("applicationContext.xml");实例 然后再配置一个xml

applicationContext：

 

运行结果：