JavaEE筆記(十一)

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上載者:User

標籤:1.0   http   config   url   root   drive   val   jdbc   方式   

Spring beans使用參數預留位置(JDBC配置讀取樣本)

beans.xml設定檔

<?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"       xsi:schemaLocation="        http://www.springframework.org/schema/beans         http://www.springframework.org/schema/beans/spring-beans.xsd        http://www.springframework.org/schema/context         http://www.springframework.org/schema/context/spring-context.xsd">      <context:property-placeholder location="db.properties"/>             <!-- 預留位置 得配置方式-->        <bean id="dbUtil" class="com.my.util.DBUtil">        <property name="driverName"  value="${driverName}"/>        <property name="url" value="${url}"/>        <property name="username" value="${username}" />        <property name="pwd" value="${pwd}"/>        </bean>   <!-- 註冊propertyPlaceholderConfigurer對象->  <bean id="propertyPlaceholderConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer" >    <property name="locations">      <list>        <value>db.properties</value>      </list>    </property>  </bean>    -->  </beans>           

db.properties 設定檔

driverName=com.mysql.jdbc.Driverurl=jdbc:mysql://127.0.0.1:3306/jg29username=rootpwd=root

(# 降低耦合度,符合開閉原則【對拓展開、對修改源碼閉】)

JavaEE筆記(十一)

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