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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原文地址：https://www.cnblogs.com/ll409546297/p/6829945.html