两大热门框架 Spring 与 Mybatis 如何整合呢？

整合的方式

• 新建 maven 项目
• 引入依赖包
• 配置资源文件

案例实操

新建 maven 项目

新建 maven 项目 spring_mybatis

目录结构如下:

主目录包:

com.xxx.dao、

com.xxx.mapper、

com.xxx.service、

com.xxx.service.impl

测试包：spring_mybatis

引入依赖包

打开 pom.xml 开始添加依赖包

<?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/m...d">
<modelVersion>4.0.0</modelVersion>
​
<groupId>com.xxx</groupId>
<artifactId>test-xxxms</artifactId>
<version>1.0-SNAPSHOT</version>
​
<name>test-xxxms</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 核心jar -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.3.2.RELEASE</version>
</dependency>
​
<!-- spring 测试jar -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>4.3.2.RELEASE</version>
</dependency>
​
<!-- spring jdbc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.3.2.RELEASE</version>
</dependency>
​
<!-- spring事物 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>4.3.2.RELEASE</version>
</dependency>
​
<!-- c3p0 连接池 -->
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
​
<!-- mybatis -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.1</version>
</dependency>
​
<!-- 添加mybatis与Spring整合的核心包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.0</version>
</dependency>
​
<!-- mysql 驱动包 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.39</version>
</dependency>
​
<!-- 日志打印相关的jar -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.2</version>
</dependency>
​
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.2</version>
</dependency>
</dependencies>
​
<build>
<finalName>tpl-web</finalName>
​
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>*/.xml</include>
</includes>
</resource>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>*/.xml</include>
<include>*/.properties</include>
</includes>
</resource>
</resources>
</build>
</project>

配置资源文件

a) Spring 文件 spring.xml

b) Mybatis 文件 mybatis.xml

c) 数据库连接 properties 文件 db.properties

d) 日志输出文件 log4j.properties

spring.xml 文件配置

<?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:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.or...
http://www.springframework.or...
http://www.springframework.or...
http://www.springframework.or...
http://www.springframework.or...d">
​
<context:component-scan base-package="com.xxx"/>
​
<context:property-placeholder location="db.properties"/>
​
<tx:annotation-driven  transaction-manager="txManager"/>
​
<!-- 配置c3p0 数据源 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driver}"></property>
<property name="jdbcUrl" value="${jdbc.url}"></property>
<property name="user" value="${jdbc.user}"></property>
<property name="password" value="${jdbc.password}"></property>
</bean>
​
<bean id="txManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
​
​
<!-- 整合 框架（Spring与Mybatis） -->
​
<!-- 配置 sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 数据源 -->
<property name="dataSource" ref="dataSource"></property>
<!-- 框架的配置文件 -->
<property name="configLocation" value="classpath:mybatis.xml" />
<!-- 映射文件 -->
<property name="mapperLocations" value="classpath:com/xxx/dao/mapper/*.xml" />
</bean>
​
<!-- 配置扫描器 -->
<bean id="mapperScanner" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 扫描com.xxx.dao这个包以及它的子包下的所有映射接口类 -->
<property name="basePackage" value="com.xxx.dao" />
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
</bean>
​
​
</beans>

mybatis.xml 文件配置

<?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>
​
<!--别名的配置 每个人必须会 -->
<typeAliases>
<package name="com.xxx.model"/>
</typeAliases>
​
</configuration>

db.properties 文件配置（对于其它数据源属性配置，见 c3p0 配置讲解，这里采用默认属性配置）

建立数据库 mybatis（注意数据库，用户名，密码以自己本地数据库为准 ）

jdbc.driver=com.mysql.jdbc.Driver
​
jdbc.url=jdbc:mysql://localhost:3306/mybatis?useUnicode=true&characterEncoding=
​
utf8
​
jdbc.username=root
​
jdbc.password=

log4j.properties

便于控制台日志输出

Global logging configuration

log4j.rootLogger=DEBUG, stdout

Console output...

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

扩展

开始编写 helloworld

User 实体类定义

public class User {
​
private int id;
​
private String userName;
​
private String userPwd;
​
public int getId() {
​
return id;
​
}
​
public void setId(int id) {
​
this.id = id;
​
}
​
public String getUserName() {
​
return userName;
​
}
​
public void setUserName(String userName) {
​
this.userName = userName;
​
}
​
public String getUserPwd() {
​
return userPwd;
​
}
​
public void setUserPwd(String userPwd) {
​
this.userPwd = userPwd;
​
}
​
@Override
​
public String toString() {
​
return "User [id=" + id + ", userName=" + userName + ", userPwd="
​

• userPwd + "]";

​
}
​
}

UseDao 接口与映射文件定义

UserDao 接口

public interface UserDao {
​
public User queryUserById(int id);
​
}

UserMapper.xml(注意：此时映射文件命名空间定义要符合规则：接口包名.接口类

名,否则不按规则出牌，测试会报错，然后你就蒙圈了！！！)

<?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.xxx.dao.UserDao">
​
<select id="queryUserById" parameterType="int" resultType="user">
​
select id,userName,userPwd from user where id=#{id}
​
</select>
​
</mapper>

UserService 接口类与实现类定义

public interface UserService {
​
public User queryUserById();
​
}

UserServiceImpl 实现类(此时直接注入我们的 UserDao 接口即可，然后直接调用

其方法，事已至此，离成功仅差一步！)

@Service
​
public class UserServiceImpl implements UserService{
​
@Resource
​
private UserDao userDao;
​
public User queryUserById(){
​
return userDao.queryUserById(7);
​
}
​
}

junit 测试

因为与 spring 框架集成，我们采用 spring 框架测试 spring Test

@RunWith(SpringJUnit4ClassRunner.class)
​
@ContextConfiguration(locations = {"classpath:spring.xml"} )
​
public class TestSpringMybatis {
​
@Autowired
​
private UserService userService;
​
@Test
​
public void testQueryUserById() {
​
System.out.println(userService.queryUserById(1));
​
}
​
}

结果输出