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SpringBoot项目整合mybatis的方法步骤与实例
1. 导入依赖的jar包
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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：
<?xml version="1.0" encoding="UTF-8"?>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
以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，谢谢大家对创新互联的支持。如果你想了解更多相关内容请查看下面相关链接
文章标题：SpringBoot项目整合mybatis的方法步骤与实例
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