#分析
AOP: 面向切面编程,相对于OOP面向对象编程。
OOP: Object Oriented Programming,面向对象的程序设计。
Spring的AOP的存在目的是为了解耦。AOP可以让一组类共享相同的行为。
在OOP中只能通过继承类和实现接口,来使代码的耦合度增强,且类继承只能为单继承,阻碍更多行为添加到一组类上,AOP弥补了OOP的不足。
Spring支持AspectJ的注解式切面编程
```
1、使用@Aspect声明类是一个切面
2、使用@After,@Before,@Around 定义建言(advice),可直接将拦截规则(切点)作为参数。
3、其中@After,@Before,@Around参数的拦截规则为切点(PointCut),为了使切点复用,
可使用@PointCut专门定义拦截规则,然后在@After,@Before,@Around的参数中调用
4、其中符合条件的每一个被拦截处为连接点(JoinPoint)
```
本示例演示基于注解拦截和基于方法拦截两种方式,演示一种模拟记录操作的日志系统的实现。
其中注解式拦截能够很好地控制要拦截的粒度和获得更丰富的信息,Spring本身在事务处理(@Transcational)和数据缓存(@Cacheable等)上面都使用此种形式的拦截。
pom.xml的配置不再累赘写上。
不知道写的朋友请见此篇博客:
http://blog.csdn.net/qq_26525215/article/details/53010442
#示例
##添加Spring aop支持及AspectJ依赖
```
<!-- spring aop 支持-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>4.2.3.RELEASE</version>
</dependency>
<!-- aspectj支持 -->
<!-- https://mvnrepository.com/artifact/org.aspectj/aspectjrt -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>1.8.9</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.9</version>
</dependency>
```
##编写拦截规则的注解
```
package cn.hncu.p1_3_3_aop;
import java.lang.annotation.*;
/**
* Created with IntelliJ IDEA.
* User: 陈浩翔.
* Date: 2016/11/9.
* Time: 上午 11:11.
* Explain:注解类
*/
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Action {
String name();
}
```
##编写使用注解的被拦截类
```
package cn.hncu.p1_3_3_aop;
import org.springframework.stereotype.Service;
/**
* Created with IntelliJ IDEA.
* User: 陈浩翔.
* Date: 2016/11/9.
* Time: 上午 11:16.
* Explain:使用注解的被拦截类
*/
@Service
public class DemoAnnotationService {
@Action(name = "@Action---DemoAnnotationService.add操作")
public void add(){
System.out.println("DemoAnnotationService.add...");
}
}
```
##编写使用方法规则的被拦截类
```
package cn.hncu.p1_3_3_aop;
import org.springframework.stereotype.Service;
/**
* Created with IntelliJ IDEA.
* User: 陈浩翔.
* Date: 2016/11/9.
* Time: 上午 11:23.
* Explain:使用方法规则的被拦截类
*/
@Service
public class DemoMethodService {
@Action(name="@Action---DemoMethodService.add操作")
public void add(){
System.out.println("DemoMethodService.add...");
}
}
```
##编写切面
```
package cn.hncu.p1_3_3_aop;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;
import java.lang.reflect.Method;
/**
* Created with IntelliJ IDEA.
* User: 陈浩翔.
* Date: 2016/11/9.
* Time: 上午 11:24.
* Explain:切面
*/
@Aspect
//通过@Aspect注解声明这是一个切面
@Component
//通过@Component让此切面成为Spring容器管理的Bean
public class LogAspect {
//注意这两个@Pointcut写法的区别!!!
// 一个是拦截注解(写了@Action注解的方法都会被拦截),一个是拦截类方法
@Pointcut("@annotation(cn.hncu.p1_3_3_aop.Action)")//通过@PointCut注解声明切点
//@Pointcut("execution(* cn.hncu.p1_3_3_aop.DemoAnnotationService..*(..))")
//配置切入点,该方法无方法体,主要为方便同类中其他方法使用此处配置的切入点
public void annotatiomPointCut(){ }
//拦截注解
@After("annotatiomPointCut()")//通过@After注解声明一个建言,并使用@PointCut定义的切点
public void after(JoinPoint joinPoint){
MethodSignature signature =(MethodSignature)joinPoint.getSignature();
Method method = signature.getMethod();
Action action = method.getAnnotation(Action.class);
System.out.println(action.name());//通过反射可获得注解上的属性,可以用来做日志记录等相关操作
}
@Before("execution(* cn.hncu.p1_3_3_aop.DemoMethodService.*(..))")
//通过@Before注解声明一个建言,此建言直接使用拦截规则作为参数
public void before(JoinPoint joinPoint){
MethodSignature signature = (MethodSignature) joinPoint.getSignature();
Method method = signature.getMethod();
Action action = method.getAnnotation(Action.class);
System.out.println("方法规则式拦截:" + method.getName()+" "+action.name());
}
}
```
##编写配置类
```
package cn.hncu.p1_3_3_aop;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableAspectJAutoProxy;
/**
* Created with IntelliJ IDEA.
* User: 陈浩翔.
* Date: 2016/11/9.
* Time: 上午 11:42.
* Explain:配置类
*/
@Configuration
@ComponentScan("cn.hncu.p1_3_3_aop")
@EnableAspectJAutoProxy //使用@EnableAspectJAutoProxy注解开启Spring对AspectJ代理的支持
public class AopConfig {
}
```
##运行类
```
package cn.hncu.p1_3_3_aop;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
/**
* Created with IntelliJ IDEA.
* User: 陈浩翔.
* Date: 2016/11/9.
* Time: 上午 11:41.
* Explain:运行类
*/
public class Main {
public static void main(String[] args) {
AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(AopConfig.class);
DemoAnnotationService demoAnnotationService = context.getBean(DemoAnnotationService.class);
demoAnnotationService.add();
DemoMethodService demoMethodService = context.getBean(DemoMethodService.class);
demoMethodService.add();
context.close();
}
}
```
#运行结果
![](http://img.blog.csdn.net/20161109134215690)
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