在applicationContext.xml中设置读取jdbc.properties文件&配置jdbcTemplate对象

在applicationContext.xml中设置读取jdbc.properties文件
refer1111

一、applicationContext.xml
<?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">
        <!--扫描包-->
        <context:component-scan base-package="cn.kgc.dao"></context:component-scan>
        <!--引入外部配置文件-->
        <context:property-placeholder location="classpath:jdbc.properties"></context:property-placeholder>
        <!--创建数据源-->
        <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
            <property name="driverClass" value="${jdbc.driver}"></property>
            <property name="jdbcUrl" value="${jdbc.url}"></property>
            <property name="user" value="${jdbc.user}"></property>
            <property name="password" value="${jdbc.password}"></property>
        </bean>
</beans>

二、jdbc.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/group_project
jdbc.user=root
jdbc.password=ROOT

配置jdbcTemplate对象

<?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:p="http://www.springframework.org/schema/p"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd">
	<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
		<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"></property>
		<property name="url" value="jdbc:oracle:thin:@127.0.0.1:1521:orcl"></property>
		<property name="password" value="123"></property>
		<property name="username" value="pro"></property>
	</bean>
	<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
		<property name="dataSource" ref="dataSource"></property>
	</bean>
	<bean id="baseDao" class="org.dao.impl.EmpDaoImpl">
		<property name="jdbcTemplate" ref="jdbcTemplate"></property>
	</bean>
 
</beans>

1、db.properties：jdbc.xxx(加jdbc.)是为了和其他的名字区分

jdbc.jdbcUrl=jdbc:mysql:///hibernate_32
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.user=root
jdbc.password=1234

2、applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd ">

<!-- 指定spring读取db.properties配置 -->
<context:property-placeholder location="classpath:db.properties"  />

<!-- 1.将连接池放入spring容器 -->
<bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >
    <property name="jdbcUrl" value="${jdbc.jdbcUrl}" ></property>
    <property name="driverClass" value="${jdbc.driverClass}" ></property>
    <property name="user" value="${jdbc.user}" ></property>
    <property name="password" value="${jdbc.password}" ></property>
</bean>

<!-- 2.将JDBCTemplate放入spring容器 (JDBCTemplate 和 DBUtils中的QueryRunner几乎一模一样）　　　　JdbcTemplate使用：　　　　　　1、JdbcTemplate是spring整合jdbc的类，直接在xml中配置，但是需要在jdbcTemplate中配置连接池，然后在dao层操作数据库　　　　　　2、也可以让dao层中的类继承JdbcDaoSupport，这样applicationContext.xml中就不用再配置JdbcTemplate了，　　　　　　　 只需要在每个dao层中的对象中配置连接池就行了，如3. -->
<bean name="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate" >
    <property name="dataSource" ref="dataSource" ></property>
</bean>

<!-- 3.将UserDao放入spring容器 -->
<bean name="userDao" class="cn.itcast.a_jdbctemplate.UserDaoImpl" >
    <!-- <property name="jt" ref="jdbcTemplate" ></property> -->
    <property name="dataSource" ref="dataSource" ></property>
</bean>
</beans>

本文地址：https://blog.csdn.net/weixin_44769957/article/details/110948650