Spring学习基于注解的AOP配置

喜欢ヅ旅行 2024-02-05 22:50 47阅读 0赞

### 5.1.创建工程 ###

![d93540201a6c4b8ebc9ff11202bd0d11.png][]

#### 5.1.1.pom.xml ####

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>com.by</groupId>
        <artifactId>Spring_AOP_Annotation</artifactId>
        <version>1.0-SNAPSHOT</version>
    
        <dependencies>
            
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>5.1.8.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-aspects</artifactId>
                <version>5.1.8.RELEASE</version>
            </dependency>
        </dependencies>
    </project>

#### 5.1.2.dao ####

@Repository
    public class UserDaoImpl implements UserDao {
        
    
        @Override
        public void addUser(){
        
            System.out.println("insert into tb_user......");
        }
    }

#### 5.1.3.service ####

@Service
    public class UserServiceImpl implements UserService {
        
    
        @Autowired
        private UserDao userDao;
    
        public void addUser() {
        
            userDao.addUser();
        }
    }

#### 5.1.4.applicationContext.xml ####

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xmlns:aop="http://www.springframework.org/schema/aop"
           xmlns:context="http://www.springframework.org/schema/context"
           xsi:schemaLocation="http://www.springframework.org/schema/beans
            		http://www.springframework.org/schema/beans/spring-beans.xsd
            		http://www.springframework.org/schema/aop
            		http://www.springframework.org/schema/aop/spring-aop.xsd
            		http://www.springframework.org/schema/context
            		http://www.springframework.org/schema/context/spring-context.xsd">
    
        <context:component-scan base-package="com.by"></context:component-scan>
    </beans>

#### 5.1.5.测试 ####

/**
     * 模拟表现层
     */
    public class Client {
        
        public static void main(String[] args) {
        
            ApplicationContext ac = 
                new ClassPathXmlApplicationContext("applicationContext.xml");
            //使用对象
            UserService userService = ac.getBean("userServiceImpl",UserService.class);
            userService.addUser();
        }
    }

### 5.2.增强 ###

#### 5.2.1.applicationContext.xml ####

<aop:aspectj-autoproxy/>

#### 3.2.3.AOP配置 ####

1.  常用注解
    
     *  @Aspect：把当前类声明为切面类
     *  @Before：前置通知，可以指定切入点表达式
     *  @AfterReturning：后置【try】通知，可以指定切入点表达式
     *  @AfterThrowing：异常【catch】通知，可以指定切入点表达式
     *  @After：最终【finally】通知，可以指定切入点表达式
     *  @Around：环绕通知，可以指定切入点表达式
2.  注解方式实现aop
    
        @Component
        @Aspect
        public class MyLogger {
              
        
            @Before("execution(* com.by.service.*.*(..))")
            public void before(){
              
                System.out.println("方法开始时间："+new Date());
            }
        
            @After("execution(* com.by.service.*.*(..))")
            public void after(){
              
                System.out.println("方法结束时间："+new Date());
            }
        }

##  ##

[d93540201a6c4b8ebc9ff11202bd0d11.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/6dc433888cf348de83b9330ee45ebc02.png