新建一个init.property文件，放置在src下，代码如下
jdbc.type=mssql
jdbc.driverClassName=com.microsoft.jdbc.sqlserver.SQLServerDriver
jdbc.url=jdbc:microsoft:sqlserver://localhost:1433;databasename=tmsoft
jdbc.username=sa
jdbc.password=

c3p0.acquireIncrement=3
c3p0.idleConnectionTextPeriod=900
c3p0.minPoolSize=2
c3p0.maxPoolSize=50
c3p0.maxStatements=100
c3p0.numHelperThreads=10
c3p0.maxIdleTime=600
c3p0.initialPoolSize = 2
   （2）在applicationContext.xml中配置如下代码

 <bean id="placeholderConfig"
  class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
  <property name="location">
   <value>classpath:init.properties</value>
  </property>
 </bean>

 <bean id="dataSource"
  class="com.mchange.v2.c3p0.ComboPooledDataSource"
  destroy-method="close" dependency-check="default">
  <property name="driverClass">
   <value>${jdbc.driverClassName}</value>
  </property>
  <property name="jdbcUrl">
   <value>${jdbc.url}</value>
  </property>
  <property name="user">
   <value>${jdbc.username}</value>
  </property>
  <property name="password">
   <value>${jdbc.password}</value>
  </property>
  <property name="acquireIncrement">
   <value>${c3p0.acquireIncrement}</value>
  </property>
  <property name="initialPoolSize">
   <value>${c3p0.initialPoolSize}</value>
  </property>
  <property name="minPoolSize">
   <value>${c3p0.minPoolSize}</value>
  </property>
  <property name="maxPoolSize">
   <value>${c3p0.maxPoolSize}</value>
  </property>
  <property name="maxStatements">
   <value>${c3p0.maxStatements}</value>
  </property>
  <property name="numHelperThreads">
   <value>${c3p0.numHelperThreads}</value>
  </property>
  <property name="maxIdleTime">
   <value>${c3p0.numHelperThreads}</value>
  </property>
 </bean>