spring-aop-xml-前置增强学习

applicationContext.xml

<?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:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">

    <!--目标对象-->
    <bean id="target" class="com.itheima.aop.TargetImpl"/>
    <!-- 切面 -->
    <bean id="myAspect" class="com.itheima.aop.MyAspect"/>
    <!-- 织入 :哪些方法需要做哪些增强-->
    <aop:config>
        <!-- 配置切面 -->
        <aop:aspect ref="myAspect">
            <!--切面：通知+切点 -->
            <aop:before method="before" pointcut="execution(public void com.itheima.aop.TargetImpl.save())"/>

        </aop:aspect>
    </aop:config>
</beans>

目标类和接口

package com.itheima.aop;

public interface Target {
  void save();
}



package com.itheima.aop;

public class TargetImpl implements Target{
  public void save(){
    System.out.println("----save---");
  }
}

切面

package com.itheima.aop;

public class MyAspect {
  void before(){
    System.out.println("前置增强");
  }

  void after(){
    System.out.println("后置增强");
  }
}

测试类：

package com.itheima.aop;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class TestAop {
  @Autowired
  private Target target;
  @Test
  public void testSave(){
    target.save();
  }
}