AOP的入门案例(登录时间记录)

导入坐标（pom.xml）

    <dependencies>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
            <scope>provided</scope>
        </dependency>
        <!--spring和springMVC环境依赖-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.18.RELEASE</version>
        </dependency>
        <!--servlet依赖-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <!--spring事务管理依赖-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.18.RELEASE</version>
        </dependency>
        <!--mybatis依赖-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.6</version>
        </dependency>
        <!--spring整合mybatis依赖-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.6</version>
        </dependency>
        <!--spring整合数据源依赖-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.2.6</version>
        </dependency>
        <!--mysql数据库连接-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.38</version>
        </dependency>
        <!--spring整合Junit依赖-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.2.18.RELEASE</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <!--lombok插件-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.10</version>
        </dependency>
        <!--日志支持-->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.0</version>
        </dependency>
    </dependencies>

连接点方法（service接口与实现类）

public interface UserService {
    public void login();
}

@Service
public class UserServiceImpl implements UserService {
    @Override
    public void login() {
        System.out.println("登录操作...");
    }
}

制作共性功能（通知类与通知，就是基于增强逻辑封装的方法）

public class MyAdvice {

   
    public void method(){
        System.out.println(new Date()+"登录...");
    }
}

创建切面类（一般都是直接在通知类上使用注解，标识当前类为切面配置类）

定义切入点

绑定切入点与通知关系（切面，在切面中完成切入点和通知的关联，通过注解实现）

//通知类必须配置成Spring管理的bean
@Component
//设置当前类为切面类类
@Aspect
public class MyAdvice {

    //设置切入点，@Pointcut注解要求配置在方法上方
    @Pointcut("execution(void com.yaorange.service.impl.UserServiceImpl.login())")
    public void pt(){}
    //设置在切入点pt()的方法执行后（不管是否出现异常）运行
    @After("pt()")
    public void method(){
        System.out.println(new Date()+"登录...");
    }
}

测试类运行代码

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = SpringConfig.class)
public class TeatAdvice {
    @Autowired
    private UserService userService;
    @Test
    public void login(){
        userService.login();
    }

}

运行结果: