spring开发_BeanFactoryPostProcessor_容器后处理器

项目结构：

http://www.cnblogs.com/hongten/gallery/image/112611.html

/spring_1700_容器后处理器/src/com/b510/app/test/SpringTest.java

 1 package com.b510.app.test;
 2 
 3 import org.springframework.context.ApplicationContext;
 4 import org.springframework.context.support.ClassPathXmlApplicationContext;
 5 
 6 import com.b510.service.AnimalService;
 7 
 8 /**
 9  * 测试类
10  * 
11  * @author Hongten
12  * 
13  */
14 public class SpringTest {
15     public static void main(String[] args) {
16         ApplicationContext act = new ClassPathXmlApplicationContext("beans.xml");
17         // 获取id为animaleServiceOfDog的Bean
18         AnimalService animalServiceOfDog = (AnimalService) act
19                 .getBean("animaleServiceOfDog");
20         animalServiceOfDog.getInfo();
21         // 获取id为animaleServiceOfCat的Bean
22         AnimalService animalServiceOfCat = (AnimalService) act
23                 .getBean("animaleServiceOfCat");
24         animalServiceOfCat.getInfo();
25     }
26 }

/spring_1700_容器后处理器/src/com/b510/app/util/MyBeanFactoryPostProcessor.java

package com.b510.app.util;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;

/**
 * 容器后处理类，实现BeanFactoryPostProcessor接口
 * 
 * @author Hongten
 * 
 */
public class MyBeanFactoryPostProcessor implements BeanFactoryPostProcessor {
    /**
     * 重写该方法，对Spring进行后处理。
     * 
     * @param beanFactory
     *            Spring容器本身
     */
    public void postProcessBeanFactory(
            ConfigurableListableBeanFactory beanFactory) throws BeansException {
        System.out.println("比较一下上面信息********************");
        System.out.println("Spring容器是：" + beanFactory);
        System.out.println("比较一下下面信息********************");
    }
}

/spring_1700_容器后处理器/src/com/b510/service/AnimalService.java

 1 package com.b510.service;
 2 
 3 /**
 4  * 动物抽象类
 5  * 
 6  * @author Hongten
 7  * 
 8  */
 9 public interface AnimalService {
10 
11     /**
12      * 获取相关信息
13 */
14     public abstract void getInfo();
15 
16 }

/spring_1700_容器后处理器/src/com/b510/service/MeatService.java

 1 package com.b510.service;
 2 
 3 /**
 4  * 定义抽象类MeatService肉类
 5  * 
 6  * @author Hongten
 7  * 
 8  */
 9 public interface MeatService {
10 
11     /**
12      * 定义方法whatMeat
13      * 
14      * @return 返回一个字符串
15 */
16     public abstract String whatMeat();
17 }

/spring_1700_容器后处理器/src/com/b510/service/impl/CatServiceBean.java

 1 package com.b510.service.impl;
 2 
 3 import com.b510.service.AnimalService;
 4 import com.b510.service.MeatService;
 5 
 6 /**
 7  * 定义猫类实现AnimaleService抽象类
 8  * 
 9  * @author Hongten
10  * 
11  */
12 public class CatServiceBean implements AnimalService {
13     private int age;
14     private MeatService meatService;
15 
16     public CatServiceBean(){
17         System.out.println("猫类被初始化了");
18     }
19 
20     public int getAge() {
21         return age;
22     }
23 
24     @Override
25     public void getInfo() {
26         System.out.println("我是猫，我的年龄是:"+age+",我很喜欢吃"+meatService.whatMeat());
27     }
28     public MeatService getMeatService() {
29         return meatService;
30     }
31 
32     public void setAge(int age) {
33         this.age = age;
34     }
35 
36     public void setMeatService(MeatService meatService) {
37         this.meatService = meatService;
38     }
39     
40 
41 }

/spring_1700_容器后处理器/src/com/b510/service/impl/DogServiceBean.java

 1 package com.b510.service.impl;
 2 
 3 import com.b510.service.AnimalService;
 4 import com.b510.service.MeatService;
 5 
 6 /**
 7  * 定义DogServiceBean类
 8  * 
 9  * @author Hongten
10  * 
11  */
12 public class DogServiceBean implements AnimalService {
13     private int age;
14     private MeatService meatService;
15 
16     public DogServiceBean() {
17         System.out.println("狗类被初始化了");
18     }
19 
20     public int getAge() {
21         return age;
22     }
23 
24     @Override
25     public void getInfo() {
26         System.out.println("我是狗，我的年龄是:" + age + ",我很喜欢吃"
27                 + meatService.whatMeat());
28     }
29 
30     public MeatService getMeatService() {
31         return meatService;
32     }
33 
34     public void setAge(int age) {
35         this.age = age;
36     }
37 
38     public void setMeatService(MeatService meatService) {
39         this.meatService = meatService;
40     }
41 
42 }

/spring_1700_容器后处理器/src/com/b510/service/impl/FishServiceBean.java

 1 package com.b510.service.impl;
 2 
 3 import com.b510.service.MeatService;
 4 
 5 /**
 6  * 定义鱼肉实现MeatService抽象类
 7  * 
 8  * @author Hongten
 9  * 
10  */
11 public class FishServiceBean implements MeatService {
12 
13     public FishServiceBean(){
14         System.out.println("鱼肉类被初始化了");
15     }
16     @Override
17     public String whatMeat() {
18         return "鱼肉";
19     }
20 
21 }

/spring_1700_容器后处理器/src/com/b510/service/impl/PorkServiceBean.java

 1 package com.b510.service.impl;
 2 
 3 import com.b510.service.MeatService;
 4 
 5 /**
 6  * 定义猪肉实现MeatService抽象类
 7  * 
 8  * @author Hongten
 9  * 
10  */
11 public class PorkServiceBean implements MeatService {
12 
13     public PorkServiceBean(){
14         System.out.println("猪肉类被初始化了");
15     }
16     @Override
17     public String whatMeat() {
18         return "猪肉";
19     }
20 
21 }

/spring_1700_容器后处理器/src/beans.xml

 1 <?xml version="1.0" encoding="GBK"?>
 2     <!-- Spring配置文件的根元素，使用spring-beans-3.0.xsd语义约束 -->
 3 <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xmlns="http://www.springframework.org/schema/beans" xmlns:p="http://www.springframework.org/schema/p"
 5     xsi:schemaLocation="http://www.springframework.org/schema/beans
 6     http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
 7 
 8     <bean id="meatServiceOfFish" class="com.b510.service.impl.FishServiceBean"></bean>
 9     <bean id="meatServiceOfPork" class="com.b510.service.impl.PorkServiceBean"></bean>
10     <bean id="animaleServiceOfDog" class="com.b510.service.impl.DogServiceBean"
11         p:age="12" p:meatService-ref="meatServiceOfPork" />
12     <bean id="animaleServiceOfCat" class="com.b510.service.impl.CatServiceBean"
13         p:age="3" p:meatService-ref="meatServiceOfFish" />
14     <!-- 容器后处理器 -->
15     <bean id="appBeanPostProcessor" class="com.b510.app.util.MyBeanFactoryPostProcessor"></bean>
16 </beans>

运行结果：

2012-3-12 20:28:20 org.springframework.context.support.AbstractApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@15eb0a9: display name [org.springframework.context.support.ClassPathXmlApplicationContext@15eb0a9]; startup date [Mon Mar 12 20:28:20 CST 2012]; root of context hierarchy
2012-3-12 20:28:20 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [beans.xml]
2012-3-12 20:28:24 org.springframework.context.support.AbstractApplicationContext obtainFreshBeanFactory
信息: Bean factory for application context [org.springframework.context.support.ClassPathXmlApplicationContext@15eb0a9]: org.springframework.beans.factory.support.DefaultListableBeanFactory@4a63d8
比较一下上面信息********************
Spring容器是：org.springframework.beans.factory.support.DefaultListableBeanFactory@4a63d8: defining beans [meatServiceOfFish,meatServiceOfPork,animaleServiceOfDog,animaleServiceOfCat,appBeanPostProcessor]; root of factory hierarchy
比较一下下面信息********************
2012-3-12 20:28:24 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
信息: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@4a63d8: defining beans [meatServiceOfFish,meatServiceOfPork,animaleServiceOfDog,animaleServiceOfCat,appBeanPostProcessor]; root of factory hierarchy
鱼肉类被初始化了
猪肉类被初始化了
狗类被初始化了
猫类被初始化了
我是狗，我的年龄是:12,我很喜欢吃猪肉
我是猫，我的年龄是:3,我很喜欢吃鱼肉

我们可以看见：“比较一下上面信息********************”和“比较一下上面信息********************”
的中间内容和系统输出的信息，连个是相同的。


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原文地址：https://www.cnblogs.com/hongten/p/java_spring_BeanFactoryPostProcessor.html