SpringBoot整合aop面向切面编程过程解析

<!--aop-->
<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-aop</artifactId>
</dependency>
<!--spring 的aop默认是使用JDK代理，即-->
<!--用来动态代理用的,基于类的代理-->
<dependency>
  <groupId>cglib</groupId>
  <artifactId>cglib</artifactId>
  <version>3.2.12</version>
</dependency>

/**
 * 普通业务组件
 */
@Component
public class CustomerBusiness {

  private String message;

  public void setMessage(String message) {
    this.message = message;
  }

  public void getMessage() {
    System.out.println("Your Message : " + message);
  }
}

@Aspect //声明式一个切面组件
@Component //加入到IoC容器
public class TimeHandler {
  
  //指定切入点表达式，拦截那些方法，即为哪些类生成代理对象
  @Pointcut("execution(* com.linhw.demo.ascpet.CustomerBusiness.*())")
  public void pointCut(){
    
  }
  
  @Before("pointCut()")
  public void printBeforeTime() {
    System.out.println("---------------Before CurrentTime = " + System.currentTimeMillis());
  }
  
  @After("pointCut()")
  public void prinAftertTime() {
    System.out.println("---------------After CurrentTime = " + System.currentTimeMillis());
  }
  
}

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = {AopApplication.class})
public class AopTest {

  @Autowired
  CustomerBusiness business;

  @Test
  public void testAop(){
    business.setMessage("hello world");
    business.getMessage();
  }
}