SprintAOP两种使用方式-CFANZ编程社区

1.通过配置文件织入
1）导入jar包

<!-- 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

public interface IUserService {

    public void add();

    public void update();

    public void delete();

    public void select();


}

package com.test.service.impl;

import com.test.service.IUserService;
import org.springframework.stereotype.Service;

@Service
public class UserService implements IUserService {

    @Override
    public void add() {
        System.out.println("这是添加用户");
    }

    @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

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

<?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

@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