ssm整合

ssm整合

一 先添加spring框架

1.创建一个maven项目

2.在pom.xml中添加spring jar包

<!-- Spring -->
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-context</artifactId>
  <version>4.3.18.RELEASE</version>
</dependency>
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-core</artifactId>
  <version>4.3.18.RELEASE</version>
</dependency>

<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-beans</artifactId>
  <version>4.3.18.RELEASE</version>
</dependency>
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-context-support</artifactId>
  <version>4.3.18.RELEASE</version>
</dependency>

3.创建基本mvc结构

pojo层:

Items类

package com.test.pojo;

import java.util.Date;

public class Items {
       private int id;
       private String name;
       private float price;
       private String detail;
       private String pic;
       private Date createtime;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public float getPrice() {
        return price;
    }

    public void setPrice(float price) {
        this.price = price;
    }

    public String getDetail() {
        return detail;
    }

    public void setDetail(String detail) {
        this.detail = detail;
    }

    public String getPic() {
        return pic;
    }

    public void setPic(String pic) {
        this.pic = pic;
    }

    public Date getCreatetime() {
        return createtime;
    }

    public void setCreatetime(Date createtime) {
        this.createtime = createtime;
    }

    @Override
    public String toString() {
        return "Items{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", price=" + price +
                ", detail='" + detail + '\'' +
                ", pic='" + pic + '\'' +
                ", createtime=" + createtime +
                '}';
    }
}

​ dao层

​ 接口 IItemsDao

package com.test.dao;

import com.test.pojo.Items;

import java.util.List;

public interface IItemsDao {


    public List<Items> selectItems();
}

​ 实现类 ItemsDao

package com.test.dao.impl;

import com.test.dao.IItemsDao;
import com.test.mapper.ItemsMapper;
import com.test.pojo.Items;

import org.springframework.stereotype.Component;

import java.io.InputStream;
import java.util.List;


public class ItemsDao implements IItemsDao {

    public ItemsDao()
    {

    }
    public List<Items> selectItems()
    {
          return null;
    }
}

service层

接口:IItemsService

package com.test.service;

import com.test.pojo.Items;

import java.util.List;

public interface IItemsService {

    public List<Items> selectItems();
}

实现类:ItemsService

package com.test.service.impl;

import com.test.dao.IItemsDao;
import com.test.mapper.ItemsMapper;
import com.test.pojo.Items;
import com.test.service.IItemsService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;


public class ItemsService implements IItemsService {

    
    private IItemsDao itemsDao;


    public List<Items> selectItems()
    {
        return itemsDao.selectItems();
    }
}

4.创建spring的配置文件

applicationContext-ioc.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-4.0.xsd
   http://www.springframework.org/schema/context
   http://www.springframework.org/schema/context/spring-context-4.0.xsd">
   
 </beans>

5.在配置文件中添加注解扫描包

<?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-4.0.xsd
   http://www.springframework.org/schema/context
   http://www.springframework.org/schema/context/spring-context-4.0.xsd">
   
   <!-- 设置注解 扫描 的包 -->
<context:component-scan base-package="com.test" />
   
 </beans>

1. 在mvc各层中添加注解

   package com.test.dao.impl;
   
   import com.test.dao.IItemsDao;
   import com.test.mapper.ItemsMapper;
   import com.test.pojo.Items;
   
   import org.springframework.stereotype.Component;
   
   import java.io.InputStream;
   import java.util.List;
   
   @Component
   public class ItemsDao implements IItemsDao {
   
       public ItemsDao()
       {
   
       }
       public List<Items> selectItems()
       {
          return null;
       }
   }
   

​

@Service
public class ItemsService implements IItemsService {

    @Autowired
    private IItemsDao itemsDao;   
    


    public List<Items> selectItems()
    {
        return itemsDao.selectItems();
    }
}

二.在spring中引入mybatis

1.导入mybatis jar包

<!-- 导入mybatis需要的jar包  -->
<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>5.1.37</version>
</dependency>
<dependency>
  <groupId>org.mybatis</groupId>
  <artifactId>mybatis</artifactId>
  <version>3.4.6</version>
</dependency>
<dependency>
  <groupId>com.mchange</groupId>
  <artifactId>c3p0</artifactId>
  <version>0.9.5.2</version>
</dependency>

 <!-- 配置日志信息-->
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
    </dependency>

2.导入spring整合mybatis架包

<!-- spring 整合 mybatis-->
  <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.0</version>
    </dependency>
 <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>4.3.18.RELEASE</version>
  </dependency>

3.创建mapper文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.test.mapper.ItemsMapper">

    <select id="selectItems"  resultType="Items">
        select * from items;
    </select>

</mapper>

4.创建mapper文件的代理接口

package com.test.mapper;

import com.test.pojo.Items;

import java.util.List;

public interface ItemsMapper {

    public List<Items> selectItems();


}

5.创建mybatis配置文件

mybatis.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!-- 设置日志的输出方法 -->
    <settings>
           <setting name="logImpl" value="STDOUT_LOGGING" />
    </settings>

    <!-- 给pojo下面的类设置别名-->
    <typeAliases>
        <package name="com.test.pojo"/>
    </typeAliases>
    <mappers>

        <mapper resource="com/test/mapper/ItemsMapper.xml"/>
    </mappers>

</configuration>

6. 创建db.properties文件

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssm?characterEncoding=utf-8
jdbc.username=root
jdbc.password=123

7. 修改applicationContext-ioc.xml文件

​ 将之前在mybatis文件中配置的数据源 交给spring来管理，并创建sqlSessionFactory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:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
   http://www.springframework.org/schema/context
   http://www.springframework.org/schema/context/spring-context-4.0.xsd">

    <!-- 设置注解 扫描 的包 -->
    <context:component-scan base-package="com.test" />

    <!-- 导入db.properties文件 -->
    <context:property-placeholder location="classpath:db.properties"></context:property-placeholder>

    <!-- 创建一个连接池对象 -->
    <bean id="comboPooledDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}" />
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
    </bean>

    <!-- 创建sqlSessionfactory对象-->
    <bean id="sqlSessionfactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="comboPooledDataSource"/>
        <property name="configLocation" value="classpath:mybatis.xml"/>
    </bean>

</beans>

8.修改dao层

package com.test.dao.impl;

import com.test.dao.IItemsDao;
import com.test.mapper.ItemsMapper;
import com.test.pojo.Items;

import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.io.InputStream;
import java.util.List;

@Component
public class ItemsDao implements IItemsDao {
    
    @Autowired
    private SqlSessionFactory sqlSessionFactory;

    public ItemsDao()
    {
      
    }

    public List<Items> selectItems()
    {
        SqlSession sqlSession= sqlSessionFactory.openSession();

        ItemsMapper itemsMapper= sqlSession.getMapper(ItemsMapper.class);

        List<Items> itemsList= itemsMapper.selectItems();

        return itemsList;
    }
}

9.在pom.xml文件中添加mapper.xml文件的路径

在build标签中添加

 <resources>
 <resource>
   <!-- 将Mapper的映射文件拷贝出来 -->
   <directory>src/main/java</directory>
   <includes>
   <include>**/*.xml</include>
   </includes>
   <filtering>true</filtering>
 </resource>
 </resources>

10.测试

@Test
public void fun()
{
    ClassPathXmlApplicationContext classPathXmlApplicationContext=new ClassPathXmlApplicationContext("/applicationContext-ioc.xml");

    IItemsService itemsService= classPathXmlApplicationContext.getBean("itemsService",IItemsService.class);

     System.out.println(itemsService.selectItems());
}

三 给mapper接口创建代理，替代原dao层的功能

​ 1.在applicationContext-ioc.xml文件中 添加

<!-- 配置映射文件的扫描器 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="com.test.mapper"/>
</bean>

1. 修改service代码

   将之前的

   @Autowired
   private IItemsDao itemsDao;

修改为

   @Autowired
   private ItemsMapper itemsMapper;

​ 完整代码如下

​

package com.test.service.impl;

import com.test.dao.IItemsDao;
import com.test.mapper.ItemsMapper;
import com.test.pojo.Items;
import com.test.service.IItemsService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;

import java.util.List;


@Service
public class ItemsService implements IItemsService {


    @Autowired
    private ItemsMapper itemsMapper;

    public List<Items> selectItems()
    {
        return itemsMapper.selectItems();
    }
}

1. 原来的dao层可以删除
2. 测试代码不变

四.在spring中引入springmvc

1.导入jar包

<!-- 导入SpringMvc 需要的jar包 -->
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-webmvc</artifactId>
  <version>4.3.18.RELEASE</version>
</dependency>
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-web</artifactId>
  <version>4.3.18.RELEASE</version>
</dependency>

2.创建springmvc.xml的配置文件

<?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"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       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     http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">


    <!-- 1. 扫描包 控制层  -->
    <context:component-scan base-package="com.test.action" />

    <!-- 2. 配置视图解析器  -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <!-- 3 开启注解-->
    <mvc:annotation-driven></mvc:annotation-driven>


</beans>

3. 在web.xml 添加 DispatcherServlet

<!-- 配置 DispatcherServlet  -->
<servlet>
  <servlet-name>dispatcherServlet</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  
  <init-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:springmvc.xml</param-value>
  </init-param>
  
  <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
  <servlet-name>dispatcherServlet</servlet-name>
  <url-pattern>/</url-pattern>
</servlet-mapping>

4.在web.xml 添加 spring容器的加载监听器

​ 让springmvc中的DispatcherServlet帮我们启动spring的相关配置文件

配置在DispatcherServlet的前面

<!-- 配置spring...xml文件的路径 -->
<context-param>
  <param-name>contextConfigLocation</param-name>
  <param-value>classpath:applicationContext-ioc.xml</param-value>
</context-param>

<!-- 配置context 加载的监听器   -->
<!-- 加载spring 的容器 -->
<listener>
  <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

5.创建控制层的类和方法 并加入注解

package com.test.action;

import com.test.pojo.Items;
import com.test.service.IItemsService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import java.util.List;

@Controller
@RequestMapping("/items")
public class ItemsAction {

    @Autowired
    private IItemsService itemsService;

    public IItemsService getItemsService() {
        return itemsService;
    }

    public void setItemsService(IItemsService itemsService) {
        this.itemsService = itemsService;
    }

    @RequestMapping("/selectItemsList")
    public ModelAndView selectItemsList()
    {
          //调用service的查询方法  返回一个list
         List<Items> itemsList= itemsService.selectItems();

          //组装ModelAndView 对象
         ModelAndView modelAndView=new ModelAndView();

         modelAndView.addObject("itemsList",itemsList);

         modelAndView.setViewName("showItems");

          //将数据存入 request，并转发到 WEB-INF/showItems.jsp页面
         return modelAndView;

    }
}

6.创建视图页面

根据之前配置的试图解析器中的前缀，需要将jsp文件创建在 WEB-INF文件夹下

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2019\6\26 0026
  Time: 10:36
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>

<c:forEach var="items" items="${itemsList}" >
    ${items.name}<br/>
</c:forEach>

</body>
</html>

7.执行

http://localhost:8080/testssm/items/selectItemsList

五.相关配置文件附录:

1.pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.test</groupId>
  <artifactId>TestSSM</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>TestSSM Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>

    <!-- Spring -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>4.3.18.Release</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>4.3.18.Release</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>4.3.18.Release</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context-support</artifactId>
      <version>4.3.18.Release</version>
    </dependency>

    <!-- 配置servlet-->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
    </dependency>

    <!--配置jsp的依赖 -->
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.2</version>
      <scope>provided</scope>
    </dependency>

    <!-- 配置jstl -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    <dependency>
      <groupId>taglibs</groupId>
      <artifactId>standard</artifactId>
      <version>1.1.2</version>
    </dependency>

    <!-- 导入mybatis需要的jar包  -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.37</version>
    </dependency>
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.6</version>
    </dependency>
    <dependency>
      <groupId>com.mchange</groupId>
      <artifactId>c3p0</artifactId>
      <version>0.9.5.2</version>
    </dependency>

    <!-- spring 整合 mybatis-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.0</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>

    <!-- 配置日志信息-->
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
    </dependency>

    <!-- 导入SpringMvc 需要的jar包 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>




  </dependencies>

  <build>
    <resources>
      <resource>
        <directory>src/main/java</directory>
        <includes>
          <include>**/*.xml</include>
        </includes>
      </resource>
    </resources>

    <finalName>TestSSM</finalName>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.1.0</version>
        </plugin>
        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.8.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.22.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-war-plugin</artifactId>
          <version>3.2.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

2.web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">


<display-name>Archetype Created Web Application</display-name>

  <!-- 配置spring...xml文件的路径 -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext-ioc.xml</param-value>
  </context-param>

  <!-- 配置context 加载的监听器   -->
  <!-- 加载spring 的容器 -->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

  
  <!-- 配置 DispatcherServlet  -->
  <servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc.xml</param-value>
    </init-param>
    
    <load-on-startup>1</load-on-startup>
  </servlet>
  
  <servlet-mapping>
    <servlet-name>dispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
  
  
  
  
</web-app>

3.db.properties

db.driverClass=com.mysql.jdbc.Driver
db.url=jdbc:mysql://localhost:3306/ssm?characterEncoding=utf-8
db.user=root
db.password=123

4.applicationContext-ioc.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"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
   http://www.springframework.org/schema/context
   http://www.springframework.org/schema/context/spring-context-4.0.xsd
   http://www.springframework.org/schema/aop
   http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
   http://www.springframework.org/schema/tx
   http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!-- 1. 配置扫描的包-->
    <context:component-scan base-package="com.test" />

    <!-- 2. 导入db.properties -->
    <context:property-placeholder location="classpath:db.properties" />

   <!-- 3 创建数据源  -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
          <property name="driverClass" value="${db.driverClass}" />
          <property name="jdbcUrl" value="${db.url}" />
          <property name="user" value="${db.user}" />
          <property name="password" value="${db.password}" />
    </bean>

    <!-- 4.创建sqlSessionFactory对象 -->
     <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
         <property name="dataSource" ref="dataSource" />
         <property name="configLocation" value="classpath:mybatis.xml" />
     </bean>

    <!-- 5.配置mapper接口的代理 需要扫描的包 -->
    <!-- mapper.xml文件和ItemsMapper接口需要放在一个包中 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.test.mapper" />
    </bean>




</beans>

5.springmvc.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"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       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 http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!-- 1. 扫描b包 控制层  -->
    <context:component-scan base-package="com.test.action" />

    <!-- 2. 配置视图解析器  -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <!-- 3 开启注解-->
    <mvc:annotation-driven></mvc:annotation-driven>


</beans>