Implementation method example of defining pointcuts in spring AOP

This article describes the implementation method of defining pointcuts in spring AOP. Share with you for your reference, as follows:

One configuration

<?xml version="1.0" encoding="GBK"?>
<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">
   <!-- 指定自动搜索Bean组件、自动搜索切面类 -->
   <context:component-scan
      base-package="org.crazyit.app.service,org.crazyit.app.aspect">
      <context:include-filter type="annotation"
        expression="org.aspectj.lang.annotation.Aspect" />
   </context:component-scan>
   <!-- 启动@AspectJ支持 -->
   <aop:aspectj-autoproxy />
</beans>

Two section class

SystemArchitecture

package org.crazyit.app.aspect;
import org.aspectj.lang.annotation.*;
@Aspect
public class SystemArchitecture
{
   @pointcut("execution(* org.crazyit.app.service.impl.*.*(..))")
   public void mypointcut(){}
}

LogAspect

package org.crazyit.app.aspect;
import org.aspectj.lang.annotation.*;
import org.aspectj.lang.*;
@Aspect
public class LogAspect
{
  // 直接使用SystemArchitecture切面类的mypointcut()切入点
  @AfterReturning(returning="rvt",pointcut="SystemArchitecture.mypointcut()")
  // 声明rvt时指定的类型会限制目标方法必须返回指定类型的值或没有返回值
  // 此处将rvt的类型声明为Object，意味着对目标方法的返回值不加限制
  public void log(Object rvt)
  {
    System.out.println("获取目标方法返回值:" + rvt);
    System.out.println("模拟记录日志功能...");
  }
}

Three interfaces

Hello

package org.crazyit.app.service;
public interface Hello {
   // 定义一个简单方法，模拟应用中的业务逻辑方法
   void foo();
   // 定义一个addUser()方法，模拟应用中的添加用户的方法
   int addUser(String name,String pass);
}

World

package org.crazyit.app.service;
public interface World {
   // 定义一个简单方法，模拟应用中的业务逻辑方法
   public void bar();
}

Four implementation classes

HelloImpl

package org.crazyit.app.service.impl;
import org.springframework.stereotype.Component;
import org.crazyit.app.service.*;
@Component("hello")
public class HelloImpl implements Hello
{
  // 定义一个简单方法，模拟应用中的业务逻辑方法
  public void foo()
  {
    System.out.println("执行Hello组件的foo()方法");
  }
  // 定义一个addUser()方法，模拟应用中的添加用户的方法
  public int addUser(String name,String pass)
  {
    System.out.println("执行Hello组件的addUser添加用户：" + name);
    if(name.length() < 3 || name.length() > 10)
    {
      throw new IllegalArgumentException("name参数的长度必须大于3，小于10！");
    }
    return 20;
  }
}

WorldImpl

package org.crazyit.app.service.impl;
import org.springframework.stereotype.Component;
import org.crazyit.app.service.*;
@Component("world")
public class WorldImpl implements World {
  // 定义一个简单方法，模拟应用中的业务逻辑方法
  public void bar() {
    System.out.println("执行World组件的bar()方法");
  }
}

Five test categories

package lee;
import org.springframework.context.*;
import org.springframework.context.support.*;
import org.crazyit.app.service.*;
public class BeanTest
{
  public static void main(String[] args)
  {
    // 创建spring容器
    ApplicationContext ctx = new
      ClassPathXmlApplicationContext("beans.xml");
    Hello hello = ctx.getBean("hello",Hello.class);
    hello.foo();
    hello.addUser("孙悟空","7788");
    World world = ctx.getBean("world",World.class);
    world.bar();
  }
}

Vi. test results

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