【Spring】

AOP Maven包:

      org.springframework
      spring-aop
    
    
      org.springframework
      spring-aspects
    

方式一：Spring AOP 1.x 配置
包的结构：

1. 先定义一个Service的接口

public interface TestSerivce {
    public void logIn();
    public boolean test();
    public void logOut();
}

2. 然后实现这个接口

public class TestServiceImpl implements TestSerivce{
    @Override
    public void logIn() {
        System.out.println("LogIn success");
    }

    @Override
    public boolean test() {
        try{
            System.out.println("test success");
            return true;
        }catch (Exception e){
            e.getMessage();
            return false;
        }
    }

    @Override
    public void logOut() {
        System.out.println("Logout success");
    }
}

3. 定义增强类：
   a. 前置通知：

public class BeforeAdvice implements MethodBeforeAdvice {
    @Override
    public void before(Method method, Object[] objects, Object o) throws Throwable {
        System.out.println("This is Before Advice");
    }
}

b. 后置通知

public class AfterAdvice implements AfterReturningAdvice {
    @Override
    public void afterReturning(Object o, Method method, Object[] objects, Object o1) throws Throwable {
        System.out.println("This is a after advice");
    }
}
	c. 环绕通知
```java
public class AroundAdvice implements MethodInterceptor {
    @Override
    public Object invoke(MethodInvocation methodInvocation) throws Throwable {
        System.out.println("环绕执行开始");

        //执行目标
        Object proceed = methodInvocation.proceed();

        System.out.println("环绕执行结束");
        return proceed;
    }
}

d. 异常通知：

public class ExceptionAdvice implements ThrowsAdvice {
//    可以利用重载抓取不同类型的Exception
    public void afterThrowing(NullPointerException nullPointerException){
        System.out.println(nullPointerException.getMessage());
        System.out.println("Get a Null exception");
    }

    public void afterThrowing(Exception e){
        System.out.println(e.getMessage());
    }
}

4. xml配置：

    


    
    
    
    


    

        

        
            
                logIn
            
        
    

    
        
        
            
               test
            
        
    

    
        
        
            
                test
            
        
    

    
        
        
            
                logIn
                test
                logOut
            
        
    


    
        
        
            
                aop01.service.TestSerivce
            
        
        
            
                beforeMethod
                afterMethod
                aroundMethod
                excMethod
            
        
    

5. 运行:

public class TestAOP {
    public static void main(String[] args) {
        ApplicationContext app=new ClassPathXmlApplicationContext("aop01/aopConfig.xml");
        TestSerivce testService =(TestSerivce) app.getBean("testService");
        testService.logIn();
        testService.test();
        testService.logOut();
    }
}

6. 运行结果：