这一章节我们再上一个章节的基础上加上一个检查订单功能

1.domain

蛋糕类：

package com.raylee.my_new_spring.my_new_spring.ch03.topic_1_4;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_4;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_4;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(Cake cake) {System.out.println(getName() + " make " + cake.getName());}}

日志类：

package com.raylee.my_new_spring.my_new_spring.ch03.topic_1_4;import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;public class Log {public void washOven() {System.out.println("washOven,logging.....");}public void checkOrder(JoinPoint joinpoint) {for (Object item : joinpoint.getArgs()) {if (item instanceof Cake) {Cake cake = (Cake) item;System.out.println(cake.getName());}}}public void prepare() {System.out.println("prepare,logging.....");}public void after() {System.out.println("after someting to do,logging.....");}public void around(ProceedingJoinPoint joinPoint) throws Throwable {washOven();prepare();long startTime = System.currentTimeMillis();joinPoint.proceed();long endTime = System.currentTimeMillis();System.out.println("use time:" + (endTime - startTime));after();}}

上面扩展了一个检測订单的功能。以便记录并检測输入的參数。

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_4;import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;@Configuration
public 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();}}

在日志类这里我们须要注意的是：

我们上面引入了joinpoint这个接口。然后从接口里面得到想要的參数，再通过转型从而得到对应的输入參数。

2.測试类：

package com.raylee.my_new_spring.my_new_spring.ch03.topic_1_4;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_4/ApplicationContext-test.xml" })
public class ChiefTest {@Autowiredprivate ApplicationContext applicationContext;@Testpublic void testChief() {Chief jack = (Chief) applicationContext.getBean(Chief.class);Cake cake = applicationContext.getBean(Cake.class);cake.setName("blueberryCheeseCake");jack.makeOneCake(cake);}
}

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.xsdhttp://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.xsdhttp://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_3" /><aop:config><aop:aspect ref="log"><aop:pointcutexpression="execution(* com.raylee.my_new_spring.my_new_spring.ch03.topic_1_3.Chief.*(..))"id="chiefPointCut" /><aop:before method="checkOrder" pointcut-ref="chiefPointCut"/></aop:aspect></aop:config></beans>

配置文件这里。我们不须要特定的cake參数，直接就是把类放到expression里面就可以。

測试输出：

blueberryCheeseCake
jack make blueberryCheeseCake

总结：这一章节主要介绍一个简单的AOP日志实现，扩展添加检查订单功能。以便记录并检測输入的參数。