spring教程笔记5

使用Spring的特殊bean

package com.hsp.beanlife;import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;public class MyBeanPostProcessor implements BeanPostProcessor {public Object postProcessAfterInitialization(Object arg0, String arg1)throws BeansException {// TODO Auto-generated method stubSystem.out.println("postProcessAfterInitialization 函数被调用");System.out.println(arg0+" 被创建的时间是"+new java.util.Date());return arg0;}public Object postProcessBeforeInitialization(Object arg0, String arg1)throws BeansException {// TODO Auto-generated method stubSystem.out.println("postProcessBeforeInitialization 函数被调用");return arg0;}}

<!-- 配置我们的自己后置处理器(有点类似我们的filter) -->
<bean id="myBeanPostProcessor" class="com.hsp.beanlife.MyBeanPostProcessor" />
</beans>

通过properties文件注入特殊bean

package com.hsp.dispatch;public class DBUtil {private String drivername;private String url;private String name;private String pwd;public String getDrivername() {return drivername;}public void setDrivername(String drivername) {this.drivername = drivername;}public String getUrl() {return url;}public void setUrl(String url) {this.url = url;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPwd() {return pwd;}public void setPwd(String pwd) {this.pwd = pwd;}
}

name=scott
drivername=oracle:jdbc:driver:OracleDirver
url=jdbc:oracle:thin:@127.0.0.1:1521:hsp
pwd=tiger# key=value

db2.name=scott3
db2.drivername=oracle:jdbc:driver:OracleDirver3
db2.url=jdbc:oracle:thin:@127.0.0.1:1521:hsp3
db2.pwd=tiger3# key=value

<?xml version="1.0" encoding="utf-8"?>
<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:tx="http://www.springframework.org/schema/tx"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd"><!-- 引入我们的db.properties文件 -->
<context:property-placeholder location="classpath:com/hsp/dispatch/db.properties,classpath:com/hsp/dispatch/db2.properties"/>
<!-- 配置一DBUtil对象 $占位符号 -->
<bean id="dbutil" class="com.hsp.dispatch.DBUtil">
<property name="name" value="${name}" />
<property name="drivername" value="${drivername}" />
<property name="url" value="${url}" />
<property name="pwd" value="${pwd}" />
</bean><!-- 配置一DBUtil对象 -->
<bean id="dbutil2" class="com.hsp.dispatch.DBUtil">
<property name="name" value="${db2.name}" />
<property name="drivername" value="${db2.drivername}" />
<property name="url" value="${db2.url}" />
<property name="pwd" value="${db2.pwd}" />
</bean></beans>

package com.hsp.dispatch;import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;public class App1 {/*** @param args*/public static void main(String[] args) {// TODO Auto-generated method stubApplicationContext ac=new ClassPathXmlApplicationContext("com/hsp/dispatch/beans.xml");DBUtil dbUtil=(DBUtil) ac.getBean("dbutil2");System.out.println(dbUtil.getDrivername()+" "+dbUtil.getName());}}

运行结果：

2020-3-2 14:15:34
org.springframework.context.support.AbstractApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@1ef9f1d: display name [org.springframework.context.support.ClassPathXmlApplicationContext@1ef9f1d]; startup date [Mon Mar 02 14:15:34 CST 2020]; root of context hierarchy
2020-3-2 14:15:34 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [com/hsp/dispatch/beans.xml]
2020-3-2 14:15:35 org.springframework.context.support.AbstractApplicationContext obtainFreshBeanFactory
信息: Bean factory for application context [org.springframework.context.support.ClassPathXmlApplicationContext@1ef9f1d]: org.springframework.beans.factory.support.DefaultListableBeanFactory@f0c85e
2020-3-2 14:15:35 org.springframework.core.io.support.PropertiesLoaderSupport loadProperties
信息: Loading properties file from class path resource [com/hsp/dispatch/db.properties]
2020-3-2 14:15:35 org.springframework.core.io.support.PropertiesLoaderSupport loadProperties
信息: Loading properties file from class path resource [com/hsp/dispatch/db2.properties]
2020-3-2 14:15:35 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
信息: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@f0c85e: defining beans [org.springframework.beans.factory.config.PropertyPlaceholderConfigurer#0,dbutil,dbutil2]; root of factory hierarchy
```oracle:jdbc:driver:OracleDirver3 scott3

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spring教程笔记5

使用Spring的特殊bean

通过properties文件注入特殊bean

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