【Spring Boot 实战与进阶】AOP 的两种动态代理，java 注解的实现原理

示例一（Cglib 动态代理，默认）

1、BookDaoImpl

@Repository

public class BookDaoImpl implements BookDao {

@Override

public void addBook(String name, String author) {

System.out.println("BookDaoImpl 实现类：bookName:"+name+", bookAuthor:"+author);

}

}

2、BookAop

@Component

@Aspect

public class BookAop {

// 定义切入点

public static final String POINT_CUT = "execution(* com.example.bootaop.dao...(..))";

@Before(POINT_CUT)

public void before() {

System.out.println("----------添加图书方法前[校验]-----------");

}

@After(POINT_CUT)

public void after(JoinPoint jp) {

System.out.println("----------添加图书成功后-----------");

System.out.println(jp.getTarget().getClass());

System.out.println(Arrays.asList(jp.getArgs()));

}

}

3、BootAopApplication

@SpringBootApplication

public class BootAopApplication {

public static void main(String[] args) {

ConfigurableApplicationContext

context = SpringApplication.run(BootAopApplication.class, args);

BookDaoImpl bookDao = context.getBean(BookDaoImpl.class);

System.out.p

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rintln(bookDao.getClass());

bookDao.addBook("神雕侠侣", "金庸");

context.close();

}

}

控制台输出

class com.example.bootaop.dao.BookDaoImpl

2d857802

----------添加图书方法前[校验]-----------

BookDaoImpl 实现类：bookName:神雕侠侣, bookAuthor:金庸

----------添加图书成功后-----------

class com.example.bootaop.dao.BookDaoImpl

[神雕侠侣, 金庸]

示例二（JDK 动态代理，只能对实现了接口的类生成代理）

1、BookDao

@Repository

public class BookDaoImpl1 implements BookDao {

@Override

public void addBook(String name, String author) {

}

}

2、BookDaoImpl1

@Repository

public class BookDaoImpl1 implements BookDao {

@Override

public void addBook(String name, String author) {

}

}

3、BootAopApplication

@SpringBootApplication

public class BootAopApplication {

public static void main(String[] args) {

ConfigurableApplicationContext

context = SpringApplication.run(BootAopApplication.class, args);

BookDao bookDao = context.getBean("bookDaoImpl1", BookDao.class);//多个实现类时

System.out.println(bookDao.getClass());

bookDao.addBook("鹿鼎记", "金庸");

context.close();

}

}

配置文件增加：spring.aop.proxy-target-class=false

控制台输出

class com.sun.proxy.$Proxy61

----------添加图书方法前[校验]-----------