Spring Annotation注解进行aop的学习

Posted 2020-08-04

使用Maven管理项目，pom文件为：

 1 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 2     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 3     <modelVersion>4.0.0</modelVersion>
 4     <groupId>com.dzg</groupId>
 5     <artifactId>spring_study</artifactId>
 6     <version>0.0.1-SNAPSHOT</version>
 7     <properties>
 8         <maven.compiler.source>1.8</maven.compiler.source>
 9         <maven.compiler.target>1.8</maven.compiler.target>
10         <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion>
11     </properties>
12 
13     <dependencies>
14         <dependency>
15             <groupId>org.springframework</groupId>
16             <artifactId>spring-context</artifactId>
17             <version>4.3.2.RELEASE</version>
18         </dependency>
19         <!-- https://mvnrepository.com/artifact/junit/junit -->
20         <dependency>
21             <groupId>junit</groupId>
22             <artifactId>junit</artifactId>
23             <version>4.12</version>
24         </dependency>
25         <!-- https://mvnrepository.com/artifact/org.aspectj/aspectjrt -->
26         <dependency>
27             <groupId>org.aspectj</groupId>
28             <artifactId>aspectjrt</artifactId>
29             <version>1.8.9</version>
30         </dependency>
31         <!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
32         <dependency>
33             <groupId>org.aspectj</groupId>
34             <artifactId>aspectjweaver</artifactId>
35             <version>1.8.9</version>
36         </dependency>
37         <!-- https://mvnrepository.com/artifact/aopalliance/aopalliance -->
38         <dependency>
39             <groupId>aopalliance</groupId>
40             <artifactId>aopalliance</artifactId>
41             <version>1.0</version>
42         </dependency>
43 
44     </dependencies>
45 </project>

pom.xml

 

建立User类：

 1 package com.dzg.spring.model;
 2 
 3 public class User {
 4     private int id;
 5     private String password;
 6     private String username;
 7     public int getId() {
 8         return id;
 9     }
10     public String getPassword() {
11         return password;
12     }
13     public String getUsername() {
14         return username;
15     }
16     public void setId(int id) {
17         this.id = id;
18     }
19     public void setPassword(String password) {
20         this.password = password;
21     }
22     public void setUsername(String username) {
23         this.username = username;
24     }
25 }

User.java

 

建立UserService类：

 1 package com.dzg.spring.service;
 2 
 3 import javax.annotation.Resource;
 4 
 5 import org.springframework.stereotype.Component;
 6 
 7 import com.dzg.spring.dao.UserDAO;
 8 import com.dzg.spring.model.User;
 9 
10 @Component
11 public class UserService {
12 
13     private UserDAO userDAO;
14 
15     public void add(User user) {
16         userDAO.save(user);
17     }
18 
19     public UserDAO getUserDAO() {
20         return userDAO;
21     }
22 
23     public UserService() {
24 
25     }
26 
27     @Resource(name = "u")
28     public void setUserDAO(UserDAO userDAO) {
29         this.userDAO = userDAO;
30     }
31 
32 }

UserService.java

 

建立UserDAO接口类：

1 package com.dzg.spring.dao;
2 
3 import com.dzg.spring.model.User;
4 
5 public interface UserDAO {
6     public void save(User user);
7 }

UserDAO.java

 

建立实现UserDAO接口的实体类UserDAOImpl类：

 1 package com.dzg.spring.dao.impl;
 2 
 3 import org.springframework.stereotype.Component;
 4 
 5 import com.dzg.spring.dao.UserDAO;
 6 import com.dzg.spring.model.User;
 7 
 8 @Component("u")
 9 public class UserDAOImpl implements UserDAO {
10 
11     @Override
12     public void save(User user) {
13         System.out.println("user saved!");
14     }
15 
16 }

UserDAOImpl.java

 

建立LogInterceptor类：

 1 package com.dzg.spring.aop;
 2 
 3 import org.aspectj.lang.annotation.Aspect;
 4 import org.aspectj.lang.annotation.Before;
 5 import org.springframework.stereotype.Component;
 6 
 7 @Aspect
 8 @Component("log")
 9 public class LogInterceptor {
10 
11     @Before("execution(public void com.dzg.spring.dao.impl.UserDAOImpl.save(com.dzg.spring.model.User))")
12     public void beforeMethod() {
13         System.out.println("save start!");
14     }
15 
16 }

LogInterceptor.java

 beans.xml文件：

 

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
 4     xmlns:aop="http://www.springframework.org/schema/aop"
 5     xsi:schemaLocation="http://www.springframework.org/schema/beans
 6         http://www.springframework.org/schema/beans/spring-beans.xsd
 7         http://www.springframework.org/schema/context
 8         http://www.springframework.org/schema/context/spring-context.xsd
 9         http://www.springframework.org/schema/aop
10         http://www.springframework.org/schema/aop/spring-aop.xsd">
11 
12     <context:annotation-config></context:annotation-config>
13     <context:component-scan base-package="com.dzg.spring"></context:component-scan>
14     <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
15     <!-- <bean id="userDAO" class="com.dzg.spring.dao.impl.UserDAOImpl"></bean> 
16         <bean id="logInterceptor" class="com.dzg.spring.aop.LogInterceptor"></bean> 
17         <bean id="userService" class="com.dzg.spring.service.UserService"> <property 
18         name="UserDAO" ref="userDAO" /> </bean> -->
19 </beans>

beans.xml

 

测试代码（使用的是junit测试）

 1 package com.dzg.spring.service;
 2 
 3 import org.junit.Test;
 4 import org.springframework.context.support.ClassPathXmlApplicationContext;
 5 
 6 import com.dzg.spring.model.User;
 7 
 8 public class UserServiceTest {
 9 
10     @Test
11     public void testAdd() throws Exception {
12         ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
13 
14         UserService service = (UserService) ctx.getBean("userService");
15         System.out.println(service.getClass());
16         User u = new User();
17         u.setUsername("zhangsan");
18         u.setPassword("zhangsan");
19         service.add(u);
20         ctx.close();
21     }
22 
23 }

UserServiceTest.java

 

控制台输出：

class com.dzg.spring.service.UserService$$EnhancerBySpringCGLIB$$21c652e7
Method Around Start!
Method start!
user saved!
Method Around Complete!
Method Complete!