首先得在pom.xml中新增两个依赖，不然你会发现要用DriverManagerDataSource这个类都没有

 <dependency>  <groupId>org.springframework</groupId>  <artifactId>spring-jdbc</artifactId>  <version>${spring.version}</version>  </dependency>  <dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.43</version></dependency>

然后在controller里写了段并加断点测试一下，与数据库联通了，没毛病

        DriverManagerDataSource dataSource = new DriverManagerDataSource();dataSource.setUrl("jdbc:mysql://localhost:3306/gotoxoyo");dataSource.setUsername("root");dataSource.setPassword("go111112");dataSource.setDriverClassName("com.mysql.jdbc.Driver");JdbcCustomerDao customerDao = new JdbcCustomerDao();customerDao.setDataSource(dataSource);Customer customer = new Customer(1, "mkyong",28);customerDao.insert(customer);Customer customer1 = customerDao.findByCustomerId(1);System.out.println(customer1);

现在该把这个数据配置移到xml中了，在src根目录下新建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/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsd"><bean id="dataSource"class="org.springframework.jdbc.datasource.DriverManagerDataSource"><property name="driverClassName" value="com.mysql.jdbc.Driver" /><property name="url" value="jdbc:mysql://localhost:3306/gotoxoyo" /><property name="username" value="root" /><property name="password" value="go111112" /></bean><bean id="customerDao" class="com.gotoxoyo.demo.dao.JdbcCustomerDao"><property name="dataSource" ref="dataSource" /></bean><!-- <context:property-placeholder location="jdbc.properties"/>-->
</beans>

现在还有个问题，controller层如果要用dao类和pojo类，还需要初始化，如下代码：

       JdbcCustomerDao customerDao = new JdbcCustomerDao();customerDao.setDataSource(dataSource);Customer customer = new Customer(1, "mkyong",28);customerDao.insert(customer);Customer customer1 = customerDao.findByCustomerId(1);System.out.println(customer1);

能不能直接让spring初始化呢，可以的，在applicationContext.xml中配置

  <bean id="customerDao" class="com.gotoxoyo.demo.dao.JdbcCustomerDao"><property name="dataSource" ref="dataSource" /></bean><bean class="com.gotoxoyo.demo.pojo.Customer" id="customer"><property name="custId" value="2" /><property name="name" value="Yang" /><property name="age" value="32" /></bean>

然后controller层的类就只需要两句代码了

   @Resourceprivate CustomerDao customerDao;public CustomerDao getCustomerDao() {return customerDao;}public void setCustomerDao(CustomerDao customerDao) {this.customerDao = customerDao;}@Resourceprivate Customer customer;public Customer getCustomer() {return customer;}public void setCustomer(Customer customer) {this.customer = customer;}在方法里只需一句代码customerDao.insert(customer);