spring 配置 注意红色字体 （1）懒加载要设为true,(2)引入配置文件  注意不能懒加载不能设为false，否则$不能引入配置文件中的变量

第一种配置 jdbc连接池

<?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:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="
     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
     http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
     http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
     http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
     http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd"
	<span style="color:#ff0000;">default-lazy-init="true"</span>>
<span style="color:#ff0000;"><context:property-placeholder ignore-resource-not-found="false" ignore-unresolvable="true" location="classpath:/application.properties" /></span>
	<!-- Tomcat JDBC连接池 -->
	<span style="color:#ff0000;"><bean id="dataSource" class="org.apache.tomcat.jdbc.pool.DataSource" destroy-method="close"></span>
		<property name="driverClassName" value="${jdbc.driver}" />
		<property name="url" value="${jdbc.url}" />
		<property name="username" value="${jdbc.username}" />
		<property name="password" value="${jdbc.password}" />
		<property name="defaultAutoCommit" value="false" />
		<property name="maxActive" value="${jdbc.pool.maxActive}" />
		<property name="maxIdle" value="${jdbc.pool.maxIdle}" />
		<property name="minIdle" value="${jdbc.pool.initialSize}" />
		<property name="initialSize"  value="${jdbc.pool.initialSize}"/>
	   <property name="testWhileIdle"><value>true</value></property>  
		<property name="validationQuery"><value>SELECT 1</value></property>  
		<property name="validationQueryTimeout"  value="10"/>
		<property name="validationInterval"  value="30000"/>
	</bean>
</beans>

jdbc连接池的 application.properties配置

#mysql database setting dev
jdbc.dbtype=mysql
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1/aaa?useUnicode=true&characterEncoding=utf-8
jdbc.username=aaa
jdbc.password=aaa

jdbc.pool.maxIdle=100
jdbc.pool.maxActive=200
jdbc.pool.minIdle=50
jdbc.pool.initialSize=100

第二种配置 使用dbcp连接池

	<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">  
	    <property name="locations">  
	       <list>  
	          <value>classpath:jdbc.properties</value> 
	       </list>  
	    </property>  
	    <property name="fileEncoding" value="utf-8"/>  
	</bean>  
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
		<!-- 加载驱动 -->
		<property name="driverClassName" value="${driverClassName}"></property>
		<!-- 数据库的名字 -->
		<property name="url" value="${jdbc_url}"></property>
		<!-- 用户名密码 -->
		<property name="username" value="${jdbc_username}"></property>
		<property name="password" value="${jdbc_password}"></property>
		<!-- 最大连接数 -->
		<property name="maxActive" value="${jdbc_maxActive}"></property>
		<!-- 最大可空闲 -->
		<property name="maxIdle" value="${jdbc_maxIdle}"></property>
		<!-- 最大等待秒数，单位为毫秒， 超过时间会报出错误信息 -->
		<property name="maxWait" value="${jdbc_maxWait}"></property>
		<!-- 默认自动提交，跟事务有关系，true，每执行就会提交，所以没有事务 -->
		<property name="defaultAutoCommit" value="${jdbc_defaultAutoCommit}"></property>
	</bean>

application.properties配置

hibernate.dialect=org.hibernate.dialect.OracleDialect
driverClassName=oracle.jdbc.driver.OracleDriver
validationQuery=SELECT 1 FROM DUAL
jdbc_url=jdbc\:oracle\:thin\:@211.67.188.189\:1521\:orcl
jdbc_username=jd
jdbc_password=admin
jdbc_maxActive=100000
jdbc_maxIdle=0
jdbc_maxWait=1000
jdbc_defaultAutoCommit=false