SpringBoot项目整合mybatis的方法步骤与实例

SpringBoot项目整合mybatis的方法步骤与实例

1. 导入依赖的jar包

springboot项目整合mybatis之前首先要导入依赖的jar包，配置pom.xml文件如下：

xmlns:xsi="http://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">

4.0.0

com.u

springboot-mybatis

1.0-SNAPSHOT

org.springframework.boot

spring-boot-starter-parent

1.3.0.RELEASE

com.us.Application

3.2.7

1.2.2

1.8

1.8

org.springframework.boot

spring-boot-starter-web

mysql

mysql-connector-java

6.0.5

com.mchange

c3p0

0.9.5.2

commons-logging

commons-logging

org.springframework

spring-jdbc

org.mybatis

mybatis

${mybatis.version}

org.mybatis

mybatis-spring

${mybatis-spring.version}

org.apache.commons

commons-lang3

3.4

xmlns:xsi="http://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">

4.0.0

com.u

springboot-mybatis

1.0-SNAPSHOT

org.springframework.boot

spring-boot-starter-parent

1.3.0.RELEASE

com.us.Application

3.2.7

1.2.2

1.8

1.8

org.springframework.boot

spring-boot-starter-web

mysql

mysql-connector-java

6.0.5

com.mchange

c3p0

0.9.5.2

commons-logging

commons-logging

org.springframework

spring-jdbc

org.mybatis

mybatis

${mybatis.version}

org.mybatis

mybatis-spring

${mybatis-spring.version}

org.apache.commons

commons-lang3

3.4

2. 配置数据源

pom.xml配置完毕后需要配置数据源了。新建DBConfig类配置数据源，代码如下：

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import org.springframework.core.env.Environment;

import com.alibaba.druid.pool.DruidDataSource;

import com.google.common.base.Preconditions;

@Configuration

public class DBConfig {

@Autowired

private Environment env;

@Bean(name = "dataSource")

public DruidDataSource dataSource() {

final String url = Preconditions.checkNotNull(env.getProperty("ms.db.url"));

final String username = Preconditions.checkNotNull(env.getProperty("ms.db.username"));

final String password = env.getProperty("ms.db.password");

final int maxActive = Integer.parseInt(env.getProperty("ms.db.maxActive", "200"));

DruidDataSource dataSource = new DruidDataSource();

dataSource.setUrl(url);

dataSource.setUsername(username);

dataSource.setPassword(password);

dataSource.setMaxActive(maxActive);

return dataSource;

}

}

3. 添加数据库连接信息

在配置文件application.properties中添加数据库连接信息如下：

ms.db.url=jdbc:mysql://localhost:3306/dev?prepStmtCacheSize=517&cachePrepStmts=true&autoReconnect=true&characterEncoding=utf-8&allowMultiQueries=true

ms.db.username=root

ms.db.password=admin

ms.db.maxActive=500

4. 配置mybatis的SqlSessionFactoryBean

数据源配置完以后要配置mybatis的SqlSessionFactoryBean进行扫描mapper，新建MyBatisConfig类代码如下（classpath*:mapper/*.xml为mapper.xml文件路径）：

import javax.sql.DataSource;

import org.mybatis.spring.SqlSessionFactoryBean;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.context.ApplicationContext;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

@Configuration

public class MyBatisConfig {

@Autowired

private DataSource dataSource;

@Bean(name = "sqlSessionFactory")

public SqlSessionFactoryBean sqlSessionFactory(ApplicationContext applicationContext) throws Exception {

SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();

sessionFactory.setDataSource(dataSource);

sessionFactory.setMapperLocations(applicationContext.getResources("classpath*:mapper/*.xml"));

return sessionFactory;

}

}

5. 配置MapperScannerConfigurer扫描dao层

然后配置MapperScannerConfigurer扫描dao层，新建类MyBatisScannerConfig代码如下（注意与MyBatisConfig不要写在一个类里）：

import org.mybatis.spring.mapper.MapperScannerConfigurer;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

@Configuration

public class MyBatisScannerConfig {

@Bean

public MapperScannerConfigurer MapperScannerConfigurer() {

MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();

mapperScannerConfigurer.setBasePackage("com.example.*.dao");

mapperScannerConfigurer.setSqlSessionFactoryBeanName("sqlSessionFactory");

return mapperScannerConfigurer;

}

}

6. 开启数据库事务（必须）代码如下

import javax.sql.DataSource;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import org.springframework.transaction.PlatformTransactionManager;

import org.springframework.transaction.annotation.TransactionManagementConfigurer;

@Configuration

public class TransactionConfig implements TransactionManagementConfigurer{

@Autowired

private DataSource dataSource;

@Bean(name = "transactionManager")

@Override

public PlatformTransactionManager annotationDrivenTransactionManager() {

return new DataSourceTransactionManager(dataSource);

}

}

7. 实战

配置大致就是如此，然后就是新建java bean（省略，文章底部有源码地址）

新建mapper.xml文件（省略，文章底部有源码地址，关于mapper.xml 文件编写的疑问可以看我以前的springmvc＋mybatis 系列文章）

新建dao层。代码如下：

import java.util.List;

import java.util.Map;

import com.example.base.model.User;

import com.example.config.MyBatisRepository;

public interface UserDao {

public List getList(Map map);

}

service层要在实现类上添加@service注解，代码如下：

import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Service;

import com.example.base.dao.UserDao;

import com.example.base.service.UserService;

@Service

public class UserServiceImpl implements UserService {

@Autowired

private UserDao userDao;

public Object getList(Map map) {

return userDao.getList(map);

}

}

controller层也要加@controller注解代码如下：

import javax.servlet.http.HttpServletRequest;

import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.http.HttpStatus;

import org.springframework.http.ResponseEntity;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.ResponseBody;

import com.example.base.service.UserService;

import com.example.base.util.CommonUtil;

import com.example.demo.ServiceEmail;

@Controller

@RequestMapping(value = "/users")

public class UserController {

@Autowired

private UserService userService;

@Autowired

private ServiceEmail serviceEmail;

/***

* api :localhost:8099/users?id=99 localhost:8099/users

*

* @param request

* @return

*/

@RequestMapping(method = RequestMethod.GET, produces = "application/json;charset=UTF-8")

@ResponseBody

public ResponseEntity> list(HttpServletRequest request) {

Map map = CommonUtil.getParameterMap(request);

return new ResponseEntity

}

}

然后在启动入口类中扫描定义的这些配置累（配置包名可却省只写部分包名）如下：

import java.util.Arrays;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.builder.SpringApplicationBuilder;

import org.springframework.boot.context.web.SpringBootServletInitializer;

import org.springframework.context.ApplicationContext;

import org.springframework.context.annotation.ComponentScan;

import org.springframework.scheduling.annotation.EnableScheduling;

@ComponentScan(basePackages ="com.example")

@SpringBootApplication

public class Application extends SpringBootServletInitializer{

@Override

protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {

return application.sources(Application.class);

}

public static void main(String[] args) throws Exception {

ApplicationContext ctx = SpringApplication.run(Application.class, args);

String[] beanNames = ctx.getBeanDefinitionNames();

Arrays.sort(beanNames);

for (String beanName : beanNames) {

System.out.println(beanName);

}

}

}

总结

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