springmvc+mybatis的两种配置和应用方式

一、不用写dao层实现的方式

1、导入依赖包，我的pom.xml文件配置如下：

<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.troy</groupId>

  <artifactId>spring-mvc</artifactId>

  <version>0.0.1-SNAPSHOT</version>

  <packaging>war</packaging>

  <dependencies>

      <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-webmvc</artifactId>

      <version>3.2.8.RELEASE</version>

    </dependency>

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-jdbc</artifactId>

      <version>3.2.8.RELEASE</version>

    </dependency>

    <dependency>

      <groupId>org.mybatis</groupId>

      <artifactId>mybatis-spring</artifactId>

      <version>1.2.3</version>

    </dependency>

    <dependency>

      <groupId>commons-dbcp</groupId>

      <artifactId>commons-dbcp</artifactId>

      <version>1.4</version>

    </dependency>

    <dependency>

      <groupId>org.mybatis</groupId>

      <artifactId>mybatis</artifactId>

      <version>3.3.0</version>

    </dependency>

    <dependency>

      <groupId>mysql</groupId>

      <artifactId>mysql-connector-java</artifactId>

      <version>5.1.37</version>

    </dependency>

    <dependency>

      <groupId>com.fasterxml.jackson.core</groupId>

      <artifactId>jackson-core</artifactId>

      <version>2.2.3</version>

    </dependency>

    <dependency>

      <groupId>com.fasterxml.jackson.core</groupId>

      <artifactId>jackson-annotations</artifactId>

      <version>2.2.3</version>

    </dependency>

    <dependency>

      <groupId>com.fasterxml.jackson.core</groupId>

      <artifactId>jackson-databind</artifactId>

      <version>2.2.3</version>

    </dependency>

  </dependencies>

</project>

2、web.xml的配置

<?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" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">

  <display-name>spring-mvc</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>

  <servlet>

      <servlet-name>springmvc</servlet-name>

      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

      <init-param>

          <param-name>contextConfigLocation</param-name>

          <param-value>classpath:spring/spring-mvc.xml</param-value>

      </init-param>

      <load-on-startup>1</load-on-startup>

  </servlet>

  <servlet-mapping>

      <servlet-name>springmvc</servlet-name>

      <url-pattern>/</url-pattern>

  </servlet-mapping>

  <filter>

      <filter-name>encodingFilter</filter-name>

      <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>

      <init-param>

          <param-name>encoding</param-name>

          <param-value>UTF-8</param-value>

      </init-param>

      <init-param>

          <param-name>forceEncoding</param-name>

          <param-value>true</param-value>

      </init-param>

  </filter>

  <filter-mapping>

      <filter-name>encodingFilter</filter-name>

      <url-pattern>/</url-pattern>

  </filter-mapping>

</web-app>

3、springmvc容器的相关配置(spring-mvc.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:jdbc="http://www.springframework.org/schema/jdbc"

    xmlns:jee="http://www.springframework.org/schema/jee"

    xmlns:tx="http://www.springframework.org/schema/tx"

    xmlns:aop="http://www.springframework.org/schema/aop"

    xmlns:mvc="http://www.springframework.org/schema/mvc"

    xmlns:util="http://www.springframework.org/schema/util"

    xmlns:jpa="http://www.springframework.org/schema/data/jpa"

    xsi:schemaLocation="

        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd

        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd

        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd

        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd

        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd

        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd

        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd

        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd

        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd">

    <mvc:annotation-driven/>

    <context:component-scan base-package="com.troy"/>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <property name="prefix" value="/WEB-INF/page/"/>

        <property name="suffix" value=".jsp"/>

    </bean>

    <import resource="spring-mybatis.xml"/>

</beans>

4、spring-mybatis的相关配置(spring-mybatis.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:jdbc="http://www.springframework.org/schema/jdbc"

    xmlns:jee="http://www.springframework.org/schema/jee"

    xmlns:tx="http://www.springframework.org/schema/tx"

    xmlns:aop="http://www.springframework.org/schema/aop"

    xmlns:mvc="http://www.springframework.org/schema/mvc"

    xmlns:util="http://www.springframework.org/schema/util"

    xmlns:jpa="http://www.springframework.org/schema/data/jpa"

    xsi:schemaLocation="

        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd

        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd

        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd

        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd

        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd

        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd

        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd

        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd

        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd">

    <util:properties id="config" location="classpath:conf/spring-config.properties"/>

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> //这里可以替换成线程池的方式连接，参数根据自己需要设置

        <property name="driverClassName" value="#{config.driver}"/>

        <property name="url" value="#{config.url}"/>

        <property name="username" value="#{config.username}"/>

        <property name="password" value="#{config.password}"/>

    </bean>

    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">

        <property name="dataSource" ref="dataSource"/>

        <property name="mapperLocations" value="classpath:mapper/*.xml"/>

    </bean>

    <bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">

        <constructor-arg index="0">

            <ref bean="sqlSessionFactory"/>

        </constructor-arg>

    </bean>

    <bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">

        <property name="basePackage" value="com.troy.dao"/>

        <property name="sqlSessionTemplate" ref="sqlSessionTemplate"/>

    </bean>

    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

        <property name="dataSource" ref="dataSource"/>

    </bean>

    <tx:annotation-driven transaction-manager="transactionManager"/>

</beans>

5、spring-config.properties的配置

driver=com.mysql.jdbc.Driver

url=jdbc:mysql://localhost:3306/m_model?useUnicode=true&amp;characterEncoding=utf8

username=root

password=root

6、mapper文件的相关配置（modelSalMap.xml）

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

<!DOCTYPE mapper PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN"

 "http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">

<mapper namespace="com.troy.dao.ModelDao">

    <select id="findAll" resultType="java.util.Map">

        select * from basemodel

    </select>

</mapper>

7、代码实现过程

1）dao层ModelDao

@Repository(value="modelDao")

public interface ModelDao {

    public List<Map<String, Object>> findAll();

}

2）service层
（1）接口ModelService

public interface ModelService {

    public List<Map<String, Object>> findAll();

}

（2）实现ModelServiceImpl

@Service(value="modelService")

public class ModelServiceImpl implements ModelService{

    @Resource(name="modelDao")

    private ModelDao modelDao;

    public List<Map<String, Object>> findAll() {

        return modelDao.findAll();

    }

}

3）控制层ModelController

@RequestMapping(value="/model")

@Controller

public class ModelController {

    @Resource(name="modelService")

    private ModelService modelService;

    @RequestMapping(value="/init")

    public String init(){

        return "model";

    }

    @RequestMapping(value="/find")

    @ResponseBody

    public List<Map<String, Object>> find(){

        return modelService.findAll();

    }

}

8、结构目录如下

9、这种方式不需要实现dao层只需要写接口就可以了，在使用的时候sqlmap的namespace对应的目录要做对应

二、需要实现dao层接口（推荐使用）

1、导入依赖包pom.xml文件相同

2、web.xml、spring-mvc.xml、spring-config.properties配置一样
3、spring-mybatis的配置如下：

<?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:jdbc="http://www.springframework.org/schema/jdbc"

    xmlns:jee="http://www.springframework.org/schema/jee"

    xmlns:tx="http://www.springframework.org/schema/tx"

    xmlns:aop="http://www.springframework.org/schema/aop"

    xmlns:mvc="http://www.springframework.org/schema/mvc"

    xmlns:util="http://www.springframework.org/schema/util"

    xmlns:jpa="http://www.springframework.org/schema/data/jpa"

    xsi:schemaLocation="

        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd

        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd

        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd

        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd

        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd

        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd

        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd

        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd

        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd">

    <util:properties id="config" location="classpath:conf/spring-config.properties"/>

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">

        <property name="driverClassName" value="#{config.driver}"/>

        <property name="url" value="#{config.url}"/>

        <property name="username" value="#{config.username}"/>

        <property name="password" value="#{config.password}"/>

    </bean>

    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">

        <property name="dataSource" ref="dataSource"/>

        <property name="mapperLocations" value="classpath:mapper/*.xml"/>

    </bean>

    <bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">

        <constructor-arg index="0">

            <ref bean="sqlSessionFactory"/>

        </constructor-arg>

    </bean>

    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

        <property name="dataSource" ref="dataSource"/>

    </bean>

    <tx:annotation-driven transaction-manager="transactionManager"/>

</beans>

说明：这里和上面不一样的地方就是没有加入mapper的管理，不用映射到具体的dao接口。mapperScannerConfigurer在不写实现的时候是可以通过映射到具体的dao层接口
4、mapper文件的相关配置（userSalMap.xml）

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

<!DOCTYPE mapper PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN"

 "http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">

<mapper namespace="user">

    <select id="findAll" parameterType="java.util.Map" resultType="java.util.Map">

        select * from basemodel where modelId=#{modelId}

    </select>

</mapper>

说明：这里的namespace的名称可以随便取，尽量符合逻辑和命名规范
5、代码实现过程

1）dao层

（1）userDao接口

public interface UserDao {

    public Map<String, Object> findAll();

}

（2）userDao接口实现（userDaoImpl）

@Repository(value="userDao")

public class UserDaoImpl implements UserDao{

    @Resource(name="sqlSessionTemplate")

    private SqlSession sqlSession;

    public Map<String, Object> findAll() {

        Map<String, Object> map = new HashMap<String, Object>();

        map.put("modelId", "09cd318807294ba4bd098e2f95f82ac5");

        Map<String, Object> result = sqlSession.selectOne("user.findAll", map);

        return result;

    }

}

2）service层
1）userService接口

public interface UserService {

    public Map<String, Object> find();

}

2）userServiceImpl实现

@Service(value="userService")

public class UserServiceImpl implements UserService{

    @Resource(name="userDao")

    private UserDao userDao;

    public Map<String, Object> find() {

        return userDao.findAll();

    }

}

3）控制层userController

@RequestMapping(value="/user")

@Controller

public class UserController {

    @Resource(name="userService")

    private UserService userService;

    @RequestMapping(value="/init")

    public String init(){

        return "user";

    }

    @RequestMapping(value="/find")

    @ResponseBody

    public Map<String, Object> find(){

        Map<String, Object> list = userService.find();

        System.out.println(list);

        System.out.println(list.size());

        return list;

    }

}

4）注意：注意userDao里面的sqlSession,这里是直接采用spring容器中的bean（sqlSessionTemplate）注入，因为sqlSession是一个接口，可以放心使用，dao层和sqlmap的连接，用空间名加方法的名称来实现。建议写一个basedao作为sqlSession的基础注入，这样就不用频繁注入bean。
6、目录结构

7、写入dao层实现的方式虽然看起来多了一步，但是在使用过程中是非常建议使用的，写入逻辑和实现都比较清晰
三、二种方式各有各的好处，不实现dao层接口的方式上面让我们思路更清晰，接口也简单有效。但是我们在开发过程中经常使用到factroyBean来实现与数据库之间的交互，所以在配置和实现过程中，建议使用dao层实现的方式来做，不建议采用映射入接口的方式来实现效果

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