使用Spring注解方试实现AOP1--前后通知与后置通知

配置文件的写法

<?xmlversion="1.0"encoding="UTF-8"?>

 

<!--

-ApplicationcontextdefinitionforJPetStore'sbusinesslayer.

-ContainsbeanreferencestothetransactionmanagerandtotheDAOsin

-dataAccessContext-local/jta.xml(seeweb.xml's"contextConfigLocation").

-->

<beansxmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:aop="http://www.springframework.org/schema/aop"

xsi:schemaLocation="

http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-2.5.xsd

http://www.springframework.org/schema/aop

http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">

<aop:aspectj-autoproxy/>

<bean id="Interceptor" class="com.sszd.aop.DbManage"/>

<bean id="DBBean" class="com.sszd.db.DbOpretor"/>

</beans>

 

首先编写一个方法类

package com.sszd.db;

 

public class DbOpretor{

publicvoidinsert(Stringsql)//带参数

{

System.out.println("insert方法(带参数)");

}

public int select(intid)//带返回值

{

  System.out.println("select方法(有返回值)");

  return id;

}

 

public void commit()

{

 System.out.println("commit方法");

}

}

创建一个切面类

@Aspect

public class DbManage{

@Pointcut("execution(*com.sszd.db..*.*(..))")

public void perform(){}

 

@Before("perform()")

public void preMangeNoargs()

{

System.out.println("前置通知无参数");

}

@AfterReturning("perform()")//无返参数

publicvoidafterMange()

{

System.out.println("后置通知无参数");

}

}

我这里用Junit做测试

package com.sszd.test;

import junit.framework.TestCase;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.sszd.db.DbOpretor;

public class AOPTest extends TestCase {

public void testAop()
{
ApplicationContext cxt = new ClassPathXmlApplicationContext("ApplicationContext.xml");
DbOpretor db = (DbOpretor)cxt.getBean("DBBean");
db.commit();
}
}

 

此外还可以对有参数以及有返回值的方法进行拦截

如insert方法

对比上一个DbManage类

@Aspect
public class DbManage {
@Pointcut("execution(* com.sszd.db..*.*(..))")
public void perform(){}

@Before("perform() && args(sql)")//带参数
public void preMangeArgs(String sql)
{
System.out.println("前置通知带参数");
System.out.println("DbManage中接收的SQL："+sql);

}

@AfterReturning(pointcut="perform()",returning="result")//有返回值
public void afterMange(int result)
{
System.out.println("后置通知");
System.out.println("DbOpretor->select方法返回原值："+result+"\n");

}
}

继续Junit测试:

package com.sszd.test;

import junit.framework.TestCase;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.sszd.db.DbOpretor;

public class AOPTest extends TestCase {

public void testAop()
{
ApplicationContext cxt = new ClassPathXmlApplicationContext("ApplicationContext.xml");
DbOpretor db = (DbOpretor)cxt.getBean("DBBean");
//db.commit();
db.insert("insert SQL");
db.select(2);
}
}

运行它：