那些年、一起追过的Spring--（7）----如何让Servlet被Spring框架管理

---

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方法来调用Spring容器BeanFactory 看看UserServlet是否能够通过Spring容器获取对象         */        WebApplicationContext wc = WebApplicationContextUtils                .getRequiredWebApplicationContext(getServletContext()); // 通过Web容器去得到BeanFactory对象        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>

运行：
浏览器输入：

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}]