两大热门框架 Spring 与 Mybatis 如何整合呢?

爱编程的小叮当

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

,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

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