Java框架spring 學習筆記（十四）：註解aop操做

回見Java框架spring Boot學習筆記（十三）：aop實例操做，這裏介紹註解aop操做

首先編寫一個切入點HelloWorld.java

1 package com.example.spring;
2 
3 public class HelloWorld {
4     public void printHello(){
5         System.out.println("Hello Aop.");
6     }
7 }

 編寫切面TimeHandler.java

 1 package com.example.spring;
 2 
 3 import org.aspectj.lang.ProceedingJoinPoint;
 4 import org.aspectj.lang.annotation.After;
 5 import org.aspectj.lang.annotation.Around;
 6 import org.aspectj.lang.annotation.Aspect;
 7 import org.aspectj.lang.annotation.Before;
 8 
 9 //使用@Aspect註解輕鬆定義切面
10 @Aspect 11 public class TimeHandler {
12 
13     // 在方法上面使用註解完成前置加強配置
14     @Before(value = "execution(* com.example.spring.HelloWorld.*(..))") 15     public void beforTime()
16     {
17         System.out.println("前置加強：CurrentTime = " + System.currentTimeMillis());
18     }
19 
20     // 在方法上面使用註解完成後置加強配置
21     @After(value = "execution(* com.example.spring.HelloWorld.*(..))") 22     public void afterTime()
23     {
24         System.out.println("後置加強：CurrentTime = " + System.currentTimeMillis());
25     }
26 
27     // 在方法上面使用註解完成環繞加強配置
28     @Around(value = "execution(* com.example.spring.HelloWorld.*(..))") 29     public void aroundTime(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
30         //方法以前
31         System.out.println("環繞加強：CurrentTime = " + System.currentTimeMillis());
32 
33         //執行被加強的方法
34         proceedingJoinPoint.proceed();
35 
36         //方法以後
37         System.out.println("環繞加強：CurrentTime = " + System.currentTimeMillis());
38     }
39 }

 編寫配置文件aop.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4        xmlns:aop="http://www.springframework.org/schema/aop"
 5        xsi:schemaLocation="http://www.springframework.org/schema/beans
 6         http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
 7         http://www.springframework.org/schema/aop
 8         http://www.springframework.org/schema/aop/spring-aop-4.2.xsd">
 9 
10     <!-- bean definition & AOP specific configuration -->
11     <!-- 1 配置對象-->
12     <bean id="helloWorld" class="com.example.spring.HelloWorld"/>
13     <bean id="timeHandler" class="com.example.spring.TimeHandler"/>
14 
15     <!-- 2 開啓aop操做-->
16     <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
17 
18 </beans>

編寫運行文件Application.java

 1 package com.example.spring;
 2 
 3 import org.springframework.context.support.AbstractApplicationContext;
 4 import org.springframework.context.support.ClassPathXmlApplicationContext;
 5 
 6 public class Application {
 7     public static void main(String[] args) {
 8         //bean配置文件所在位置 D:\\IdeaProjects\\spring\\src\\Beans.xml
 9         //使用AbstractApplicationContext容器
10         AbstractApplicationContext context = new ClassPathXmlApplicationContext("file:D:\\IdeaProjects\\spring\\src\\aop.xml");
11         //獲得配置建立的對象
12         HelloWorld helloWorld = (HelloWorld)context.getBean("helloWorld");
13         helloWorld.printHello();
14     }
15 }

運行輸出

環繞加強：CurrentTime = 1510208830742
前置加強：CurrentTime = 1510208830742
Hello Aop.
環繞加強：CurrentTime = 1510208830750
後置加強：CurrentTime = 1510208830750