Spring——AOP注解使用

悠悠 2023-10-11 11:06 9阅读 0赞

**一、导入依赖：**

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<dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>5.0.2.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context-support</artifactId>
                <version>5.0.2.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-core</artifactId>
                <version>5.0.2.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-beans</artifactId>
                <version>5.0.2.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-expression</artifactId>
                <version>5.0.2.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-test</artifactId>
                <version>5.0.2.RELEASE</version>
            </dependency>
    
            
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-aop</artifactId>
                <version>5.0.2.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>aopalliance</groupId>
                <artifactId>aopalliance</artifactId>
                <version>1.0</version>
            </dependency>
            <dependency>
                <groupId>org.aspectj</groupId>
                <artifactId>aspectjweaver</artifactId>
                <version>1.8.7</version>
            </dependency>
    
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.12</version>
            </dependency>
    
            <dependency>
                <groupId>commons-logging</groupId>
                <artifactId>commons-logging</artifactId>
                <version>1.1.2</version>
            </dependency>

依赖

**二、通知类：**

@Component
    @Aspect
    public class Log {
        @Pointcut("execution( * com.qf.aop..*(..))")
        public void logPointCut() { }
    
        @Before("logPointCut()")
        public void before() {
            System.out.println("前置通知");
        }
        @AfterReturning("logPointCut()")
        public void afterReturning() {
            System.out.println("后置通知(方法不出现异常)");
        }
        @AfterThrowing("logPointCut()")
        public void afterException() {
            System.out.println("异常通知");
        }
        @After("logPointCut()")
        public void after() {
            System.out.println("最终通知(方法不出现异常)");
        }
    
        @Around("logPointCut()")
        public Object around(ProceedingJoinPoint point) throws Throwable {
            System.out.println("这是环绕通知之前的部分");
            Object proceed=null;
            try {
                proceed = point.proceed();
                System.out.println("这是环绕通知之后的部分");
            }catch (Exception e){
                System.out.println(e.getMessage());
                System.out.println("这是环绕通知异常的部分");
            }finally {
                System.out.println("这是最终通知");
            }
            return proceed;
        }
    }

**三、被增强类：**

@Component
    public class UserManager {
        public void addStudent(User user) {
            //System.out.println(3/0);
            System.out.println("增加用户");
        }
    }

**四、application-context.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:bean="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">
        
        <bean:component-scan base-package="com.qf" />
        
        <aop:aspectj-autoproxy ></aop:aspectj-autoproxy>
    </beans>

**五、测试：**

public class T {
        public static void main(String[] args) {
            ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("application-context.xml");
            UserManager userManager = context.getBean("userManager",UserManager.class);
            userManager.addStudent(new User());
        }
    }

**六、注意点：**

使用注解配置：最终通知会再后置通知之前，但是环绕通知还是照常；

转载于:https://www.cnblogs.com/Tractors/p/11333448.html

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