配置spring.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:p="http://www.springframework.org/schema/p"
    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">

    <context:component-scan base-package="com.gxa.spring.day02"></context:component-scan
 
>

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
    destroy-method="close" 
    p:driverClassName="com.mysql.jdbc.Driver"
    p:url="jdbc:mysql://localhost:3306/mybatis" 
    p:username="root"
    p:password="root" />


    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"
 
>
        <property name="dataSource" ref="dataSource"></property>
    </bean>

</beans>

servlet:

package com.gxa.spring.day02;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.config.AutowireCapableBeanFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

@Controller
@WebServlet("/user.do")
public class UserServlet extends HttpServlet {

    @Autowired
    private UserService userService;

    @Override
    public void init() throws ServletException {
        /**
         * 利用init方法來呼叫Spring容器BeanFactory 看看UserServlet是否能夠通過Spring容器獲取物件
         */
        WebApplicationContext wc = WebApplicationContextUtils
                .getRequiredWebApplicationContext(getServletContext()); // 通過Web容器去得到BeanFactory物件
        AutowireCapableBeanFactory autowireCapableBeanFactory = wc
                .getAutowireCapableBeanFactory();
        autowireCapableBeanFactory.autowireBean(this);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        userService.getUser();
    }
}

service:

package com.gxa.spring.day02;

public interface UserService {

    public void getUser();

}

package com.gxa.spring.day02;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service("userService")
public class UserServiceImpl implements UserService {

    @Autowired
    private UserDao userDao;

    @Override
    public void getUser() {
        userDao.getUser();
    }

}

dao:

package com.gxa.spring.day02;

public interface UserDao {
    public void getUser();
}

package com.gxa.spring.day02;

import java.util.List;
import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;

@Repository("userDao")
public class UserDaoImpl implements UserDao {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    @Override
    public void getUser() {
        String sql = "select * from student";
        List<Map<String,Object>> list = jdbcTemplate.queryForList(sql);
        System.out.println(list);
    }

}

配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>SpringTest09-Servlet</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>

   <context-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring.xml</param-value>
  </context-param>

  <listener>
      <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

</web-app>

執行：
瀏覽器輸入：

http://localhost:8080/SpringTest09-Servlet/user.do

[{sid=1, sname=asfsaf, t_id=1}, {sid=2, sname=dsagdhfa, t_id=2}, {sid=2, sname=ad, t_id=1}]