基于代理类的Aop实现

Dear 丶 2022-04-13 14:07 233阅读 0赞

1.pom.xml文件

<?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>edu.njxz.demo</groupId>
        <artifactId>springTest</artifactId>
        <version>1.0-SNAPSHOT</version>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>5.0.6.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.12</version>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>5.1.47</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-jdbc</artifactId>
                <version>5.1.2.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>commons-logging</groupId>
                <artifactId>commons-logging</artifactId>
                <version>1.2</version>
            </dependency>
            <dependency>
                <groupId>aopalliance</groupId>
                <artifactId>aopalliance</artifactId>
                <version>1.0</version>
            </dependency>
        </dependencies>
    
    
    </project>

2.创建目标类接口

public interface TestDao {
        void save();
        void delete();
    }

3.实现接口类

public class TestDaoImpl  implements TestDao{
        public void save() {
            System.out.println("保存");
        }
    
        public void delete() {
            System.out.println("删除");
        }
    }

4.创建切面类

public class MyAspect implements MethodInterceptor {
        public Object invoke(MethodInvocation invocation) throws Throwable {
                    //增强方法
            check();
            except();
    
            //执行目标方法
            Object obj=invocation.proceed();
    
            //增强方法
            log();
            minitor();
    
            return obj;
    
        }
        
    
        public void check(){
            System.out.println("模拟权限控制");
        }
    
        public void except(){
            System.out.println("模拟异常处理");
        }
    
        public void log(){
            System.out.println("模拟日志记录");
        }
    
        public void minitor(){
            System.out.println("模拟性能检测");
        }
    }

5.配置切面并指定代理

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    
        
        <bean id="testDao" class="edu.njxz.demo.dynamicProxy.TestDaoImpl">
        </bean>
    
        
        <bean id="myAspect" class="edu.njxz.demo.springAop.MyAspect">
        </bean>
    
        
        <bean id="testDaoProxy" class="org.springframework.aop.framework.ProxyFactoryBean">
            
            <property name="proxyInterfaces" value="edu.njxz.demo.dynamicProxy.TestDao"></property>
            
            <property name="target" ref="testDao"></property>
            
            <property name="interceptorNames" value="myAspect"></property>
            
            <property name="proxyTargetClass" value="true"></property>
        </bean>
    </beans>

6.创建测试类

public class Test {
        public static void main(String[] args) {
            //把beans.xml的类加载到容器
            ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
    
            //从容器中获取增强后的目标对象
            TestDao testDaoAdvice =(TestDao)applicationContext.getBean("testDaoProxy");
    
            //执行方法
            testDaoAdvice.save();
            System.out.println("***************");
            testDaoAdvice.delete();
        }
    }

7.测试运行结果  
[![springAopResult][]][springAopResult 1]

[springAopResult]: https://github.com/yangxuechen/learnSSM/raw/master/resource/sping-learn-images/springAopResult.jpg
[springAopResult 1]: https://github.com/yangxuechen/learnSSM/blob/master/resource/sping-learn-images/springAopResult.jpg