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

<?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">

<artifactId>test-xxxms</artifactId>

<version>1.0-SNAPSHOT</version>

<name>test-xxxms</name>

<url>http://www.example.com</url>

<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>

<groupId>junit</groupId>

<artifactId>junit</artifactId>

</dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-context</artifactId>

<version>4.3.2.RELEASE</version>

</dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-test</artifactId>

<version>4.3.2.RELEASE</version>

</dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-jdbc</artifactId>

<version>4.3.2.RELEASE</version>

</dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-tx</artifactId>

<version>4.3.2.RELEASE</version>

</dependency>

</dependency>

<groupId>org.mybatis</groupId>

<artifactId>mybatis</artifactId>

</dependency>

<groupId>org.mybatis</groupId>

<artifactId>mybatis-spring</artifactId>

</dependency>

<groupId>mysql</groupId>

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

</dependency>

</dependency>

</dependency>

</dependencies>

<build>

</includes>

</resource>

<directory>src/main/resources</directory>

<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

<?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.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/tx

http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">

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

<context:property-placeholder location="db.properties"/>

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

</bean>

<bean id="txManager"

class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

</bean>

</bean>

</bean>

</beans>

~~~

#### mybatis.xml 文件配置

~~~ xml

<?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">

</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** ）

~~~ xml

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

~~~ xml

# 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

~~~ java

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

~~~ java

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

<?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">

select id,userName,userPwd from user where id=#{id}

</select>

</mapper>

~~~

#### UserService 接口类与实现类定义

~~~ java

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！**)

~~~ java

@Service

public class UserServiceImpl implements UserService{

@Resource

private UserDao userDao;

public User queryUserById(){

return userDao.queryUserById(7);

}

~~~

#### junit 测试需要视频配套资料或其他资料+我们小姐姐V lezijie007（加好友暗号 98 ，不备注不加）

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

~~~ java

@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

![](https://img-blog.csdnimg.cn/img_convert/b233587bc200d77eb84fb777d83cf636.png)