SpringAOP两种使用方式

1.通过配置文件织入
1）导入jar包

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<!-- Spring --> <dependency>   <groupId>org.springframework</groupId>   <artifactId>spring-context</artifactId>   <version>4.3.18.Release</version> </dependency> <dependency>   <groupId>org.springframework</groupId>   <artifactId>spring-core</artifactId>   <version>4.3.18.Release</version> </dependency>   <dependency>   <groupId>org.springframework</groupId>   <artifactId>spring-beans</artifactId>   <version>4.3.18.Release</version> </dependency> <dependency>   <groupId>org.springframework</groupId>   <artifactId>spring-context-support</artifactId>   <version>4.3.18.Release</version> </dependency>         <dependency>   <groupId>org.springframework</groupId>   <artifactId>spring-expression</artifactId>   <version>4.3.18.RELEASE</version> </dependency>         <dependency>   <groupId>commons-logging</groupId>   <artifactId>commons-logging</artifactId>   <version>1.1.3</version> </dependency>   <dependency>   <groupId>log4j</groupId>   <artifactId>log4j</artifactId>   <version>1.2.16</version> </dependency>       <!-- 配置servlet--> <dependency>   <groupId>javax.servlet</groupId>   <artifactId>javax.servlet-api</artifactId>   <version>3.1.0</version>   <scope>provided</scope> </dependency>   <!--配置jsp的依赖 --> <dependency>   <groupId>javax.servlet.jsp</groupId>   <artifactId>jsp-api</artifactId>   <version>2.2</version>   <scope>provided</scope> </dependency>   <!-- 配置jstl --> <dependency>   <groupId>javax.servlet</groupId>   <artifactId>jstl</artifactId>   <version>1.2</version> </dependency> <dependency>   <groupId>taglibs</groupId>   <artifactId>standard</artifactId>   <version>1.1.2</version> </dependency>   <dependency>   <groupId>mysql</groupId>   <artifactId>mysql-connector-java</artifactId>   <version>5.1.37</version> </dependency> <dependency>   <groupId>commons-dbutils</groupId>   <artifactId>commons-dbutils</artifactId>   <version>1.6</version> </dependency> <dependency>   <groupId>com.mchange</groupId>   <artifactId>c3p0</artifactId>   <version>0.9.5.2</version> </dependency>   <!-- 配置的 spring-jdbc --> <dependency>   <groupId>org.springframework</groupId>   <artifactId>spring-jdbc</artifactId>   <version>4.3.18.RELEASE</version> </dependency>   <!-- 事务相关的架包 --> <dependency>   <groupId>org.springframework</groupId>   <artifactId>spring-tx</artifactId>   <version>4.3.18.RELEASE</version> </dependency>   <dependency>   <groupId>org.springframework</groupId>   <artifactId>spring-aspects</artifactId>   <version>4.3.18.RELEASE</version> </dependency>   <dependency>   <groupId>org.springframework</groupId>   <artifactId>spring-aop</artifactId>   <version>4.3.18.RELEASE</version> </dependency>       <!-- aop --> <dependency>   <groupId>org.aspectj</groupId>   <artifactId>aspectjweaver</artifactId>   <version>1.8.10</version> </dependency>   <dependency>   <groupId>org.springframework</groupId>   <artifactId>spring-aspects</artifactId>   <version>4.3.18.RELEASE</version> </dependency>   <dependency>   <groupId>org.springframework</groupId>   <artifactId>spring-aop</artifactId>   <version>4.3.18.RELEASE</version> </dependency>

　　

2） 创建目标类

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public interface IUserService {       public void add();       public void update();       public void delete();       public void select();     }

　　

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package com.test.service.impl;<br> import com.test.service.IUserService; <br>import org.springframework.stereotype.Service; <br>@Service <br>public class UserService implements IUserService { @Override public void add() { System.out.println("这是添加用户"); } <br>@Override public void update() { System.out.println("这是修改用户"); } @Override public void delete() { System.out.println("这是删除用户"); } @Override public void select() { System.out.println("这是查询用户"); } } 3)创建增强类

　　

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package com.test.aspects;   import org.aspectj.lang.ProceedingJoinPoint; import org.springframework.stereotype.Service;   import java.text.SimpleDateFormat; import java.util.Date;   //创建一个增强类   public class MyAdvice {       public void printTime()     {         String time= new SimpleDateFormat("yyyy-MM-dd hh:mm:ss").format(new Date());         System.out.println( "准备在目标方法的前面打印时间:"+time);     }       //无论是否成功 都会执行     public void printTimeAfter()     {         String time= new SimpleDateFormat("yyyy-MM-dd hh:mm:ss").format(new Date());         System.out.println( "准备在目标方法的后面打印时间:"+time);     }         //环绕通知     //环绕通知会替代原来的目标方法，如果没有放行目标方法 会导致目标方法只执行     public void round(ProceedingJoinPoint point) throws Throwable {         //查询方法         System.out.println( "准备在目标方法中添加环绕通知");           if(false)              point.proceed(); //放行目标方法     }       //成功后以后才执行     //如果配置了after通知  则afterReturning不会被执行     public void afterReturning()     {        System.out.println("目标方法成功运行后");     }     //出异常后以后才执行     //如果配置了after通知  则exception不会被执行     public void exception()     {         System.out.println("出异常了");     }       }

　　

4）在配置文件中织入

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<?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:context="http://www.springframework.org/schema/context"        xmlns:aop="http://www.springframework.org/schema/aop"        xsi:schemaLocation="http://www.springframework.org/schema/beans    http://www.springframework.org/schema/beans/spring-beans-4.0.xsd    http://www.springframework.org/schema/context    http://www.springframework.org/schema/context/spring-context-4.0.xsd    http://www.springframework.org/schema/aop    http://www.springframework.org/schema/aop/spring-aop-4.0.xsd    http://www.springframework.org/schema/tx    http://www.springframework.org/schema/tx/spring-tx.xsd">         <!-- 扫描注解所在的位置 -->     <context:component-scan base-package="com.test" />         <!-- 创建增强类对象-->   <bean id="myAdvice" class="com.test.aspects.MyAdvice"></bean>     <!-- 配置aop -->   <aop:config>         <!-- 创建切点 -->         <aop:pointcut id="pc" expression="execution(* com.test.service.impl.*Service.*(..))"/>          <!-- 织入 -->         <aop:aspect ref="myAdvice">              <aop:before method="printTime" pointcut-ref="pc" />              <!--<aop:after method="printTimeAfter" pointcut-ref="pc" />-->              <aop:around method="round" pointcut-ref="pc" />              <aop:after-returning method="afterReturning" pointcut-ref="pc" />             <aop:after-throwing method="exception" pointcut-ref="pc" />         </aop:aspect>        </aop:config> </beans>

　　

5)测试

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@Test public void fun() {     ClassPathXmlApplicationContext classPathXmlApplicationContext=new ClassPathXmlApplicationContext("/applicationContext-aop.xml");       IUserService userService=  classPathXmlApplicationContext.getBean("userService",IUserService.class);       userService.add();       userService.delete();   }

　　

注意:

​ befor通知：在目标方法调用前执行，目标方法会执行

around通知:在目标方法调用的时候执行，用来替代目标方法,如果在通知中没有放行目标方法，目标方法不会执行 ,如果目标方法有返回值 则around方法也应该有返回值

public void round(ProceedingJoinPoint point) throws Throwable {
//查询方法
System.out.println( “准备在目标方法中添加环绕通知”);
if(false)
point.proceed(); //放行目标方法
}

//环绕通知
public Object around(ProceedingJoinPoint point) throws Throwable {
System.out.println(“查询所有用户信息”);
return point.proceed();// 等价于userDao.select()
}
after：无论目标方式是成功返回还是出异常 都执行

afterReturning: 目标方法成功返回后执行

afterExeption ：目标方法出异常后执行