从头认识Spring-3.1 简单的AOP日志实现-某方法之前的前后记录日志

这一章节我们引入简单的AOP日志实现。

1.domain

蛋糕类：

package com.raylee.my_new_spring.my_new_spring.ch03.topic_1_1;public class Cake {private String name = "";public String getName() {return name;}public void setName(String name) {this.name = name;}}

烤炉类：

package com.raylee.my_new_spring.my_new_spring.ch03.topic_1_1;public class Oven {private String name = "";@Overridepublic String toString() {return name;}public String getName() {return name;}public void setName(String name) {this.name = name;}}

厨师类：

package com.raylee.my_new_spring.my_new_spring.ch03.topic_1_1;public class Chief {private static int index = 0;public static int getIndex() {return index;}public static void setIndex(int index) {Chief.index = index;}private Cake cake = null;private final int id = index++;private String name = "";private Oven oven = null;public Cake getCake() {return cake;}public int getId() {return id;}public String getName() {return name;}public Oven getOven() {return oven;}public void setCake(Cake cake) {this.cake = cake;}public void setName(String name) {this.name = name;}public void setOven(Oven oven) {this.oven = oven;}public void makeOneCake() {System.out.println(getName() + " make " + getCake().getName());}}

上面的几个类我们只是简单的定义了一些属性，只是在厨师类那里加上了一个简单的方法。

日志类：

package com.raylee.my_new_spring.my_new_spring.ch03.topic_1_1;public class Log {public void washOven() {System.out.println("washOven,logging.....");}public void prepare() {System.out.println("prepare,logging.....");}public void after() {System.out.println("after someting to do,logging.....");}}

我们定义了三个方法，头两个是调用方法前执行的，后面一个是调用方法后执行的

配置类：（我们这里使用基于java的配置）

package com.raylee.my_new_spring.my_new_spring.ch03.topic_1_1;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic class SpringBeans {@Beanpublic Chief jack() {Chief chief = new Chief();chief.setName("jack");chief.setOven(oven());chief.setCake(cake());return chief;}@Beanpublic Oven oven() {Oven oven = new Oven();oven.setName("big oven");return oven;}@Beanpublic Cake cake() {Cake cake = new Cake();cake.setName("blueberryCheeseCake");return cake;}@Beanpublic Log log() {return new Log();}}

2.测试类：

package com.raylee.my_new_spring.my_new_spring.ch03.topic_1_1;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.ApplicationContext;import org.springframework.test.context.ContextConfiguration;import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration(locations = {"/com/raylee/my_new_spring/my_new_spring/ch03/topic_1_1/ApplicationContext-test.xml" })public class ChiefTest {@Autowiredprivate ApplicationContext applicationContext;@Testpublic void testChief() {Chief jack = (Chief) applicationContext.getBean(Chief.class);jack.makeOneCake();}}

3.配置文件（重点）

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx"xmlns:aop="http://www.springframework.org/schema/aop" xmlns:util="http://www.springframework.org/schema/util"xsi:schemaLocation="        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsdhttp://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsdhttp://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.0.xsdhttp://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"><context:component-scanbase-package="com.raylee.my_new_spring.my_new_spring.ch03.topic_1_1" /><aop:config><aop:aspect ref="log"><aop:pointcutexpression="(execution(* com.raylee.my_new_spring.my_new_spring.ch03.topic_1_1.Chief.*(..)))"id="chiefPointCut" /><aop:before method="washOven" pointcut-ref="chiefPointCut" /><aop:before method="prepare" pointcut-ref="chiefPointCut" /><aop:after method="after" pointcut-ref="chiefPointCut" /></aop:aspect></aop:config></beans>

解释一下配置文件的东西：

（1）我们使用<aop:config/>标签定义aop

（2）然后定义通过<aop:aspect>切面

（3）再通过<aop:pointcut/>定义切入点

（4）最后通过<aop:before/><aop:after/>等定义切点的前后方法

在这里解释一下expression里面的内容

execution(* com.raylee.my_new_spring.my_new_spring.ch03.topic_1_1.Chief.*(..))

（1）第一颗星表示返回任意类型

（2）com.raylee.my_new_spring.my_new_spring.ch03.topic_1_1代表包名

（3）Chief代表那个类

（4）*(..)代表任意方法，里面的..表示任何参数

（5）当然我们也可以简单点，全是用*这个东西来标注，不过一般不这样做，因为每一个切点对应的应该是不同的方法

测试输出：

washOven,logging.....
prepare,logging.....
jack make blueberryCheeseCake
after someting to do,logging.....

总结：这一章节主要介绍一个简单的AOP日志实现。

目录：http://blog.csdn.net/raylee2007/article/details/50611627 

 

我的github：https://github.com/raylee2015/my_new_spring

目录：http://blog.csdn.net/raylee2007/article/details/50611627 

 

我的github：https://github.com/raylee2015/my_new_spring