SpringJDBC ClassPathXmlApplicationContext无法从资源中的xml加载getbean

Question

我是java中的菜鸟。我想将数据插入到employees表中。

  

错误：没有定义名为'employeeDAO.class'的bean。

     

我的代码结构：

这是我的代码。

  

file：com.vm.springjdbc.app.App.java

public class App {
    private ApplicationContext context;
    private EmployeeDAO employeeDAO;

    public static void main(String[] args) {
        context = new ClassPathXmlApplicationContext("Spring-Datasource.xml");
        employeeDAO = (EmployeeDAO) context.getBean("employeeDAO.class");
    }
}

  

file：com.vm.springjdbc.model.Employee.java

public class Employee { 
    private int id;
    private String name;
    private String mobile;
    setter & getter
}

  

file：com.vm.springjdbc.DAO.EmployeDAO.java

public class EmployeeDAO extends JdbcDaoSupport {   
    public void insert(Employee emp){       
    }
}

  

资源中的Xml文件：src / resources / Spring-Datasource.xml

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.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/synapse4" />
        <property name="username" value="root" />
        <property name="password" value="admin" />
    </bean>

    <bean id="employeeDAO" class="com.vm.springjdbc.DAO.EmployeeDAO">
        <property name="dataSource" ref="dataSource" />
    </bean>
</beans>

  

请帮我解决一下

Answer 1

您应该将EmployeeDAO作为接口，并为此EmployeeDAOImpl创建一个impl类，如下所示：

  

EmployeeDAO.java

public interface EmployeeDAO 
{
    public void insert(Employee employee);
}

  

EmployeeDAOImpl.java

public class EmployeeDAOImpl extends JdbcDaoSupport implements EmployeeDAO
{
    public void insert(Employee employee){
        //insertion implementation
    }

}

并在Spring-Datasource.xml中进行以下更改

<bean id="employeeDAO" class="com.vm.springjdbc.DAO.EmployeeDAOImpl">
   <property name="dataSource" ref="dataSource" />
</bean>

另外，请不要在

中使用.class

employeeDAO = (EmployeeDAO) context.getBean("employeeDAO.class");

将其更改为

employeeDAO = (EmployeeDAO) context.getBean("employeeDAO");