spring boot mybatis 整合_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/maven-4.0.0.xsd"><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/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/txhttp://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"/><!-- 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 configurationPUBLIC "-//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