1. 導入依賴的jar包
springboot項目整合mybatis之前首先要導入依賴的jar包，配置pom.xml文件如下：
<?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.u</groupId> <artifactId>springboot-mybatis</artifactId> <version>1.0-SNAPSHOT</version> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.3.0.RELEASE</version> </parent> <properties> <start-class>com.us.Application</start-class> <mybatis.version>3.2.7</mybatis.version> <mybatis-spring.version>1.2.2</mybatis-spring.version> <maven.compiler.target>1.8</maven.compiler.target> <maven.compiler.source>1.8</maven.compiler.source> </properties> <dependencies> <!--springboot--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!--db--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>6.0.5</version> </dependency> <dependency> <groupId>com.mchange</groupId> <artifactId>c3p0</artifactId> <version>0.9.5.2</version> <exclusions> <exclusion> <groupId>commons-logging</groupId> <artifactId>commons-logging</artifactId> </exclusion> </exclusions> </dependency> <!--mybatis--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>${mybatis.version}</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>${mybatis-spring.version}</version> </dependency> <!--util--> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>3.4</version> </dependency> </dependencies></project>2. 配置數據源
pom.xml配置完畢后需要配置數據源了。新建DBConfig類配置數據源，代碼如下：
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;@Configurationpublic 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. 添加數據庫連接信息
在配置文件application.properties中添加數據庫連接信息如下：
ms.db.url=jdbc:mysql://localhost:3306/dev?prepStmtCacheSize=517&cachePrepStmts=true&autoReconnect=true&characterEncoding=utf-8&allowMultiQueries=truems.db.username=rootms.db.password=adminms.db.maxActive=500
4. 配置mybatis的SqlSessionFactoryBean
數據源配置完以后要配置mybatis的SqlSessionFactoryBean進行掃描mapper，新建MyBatisConfig類代碼如下（classpath*:mapper/*.xml為mapper.xml文件路徑）：
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;@Configurationpublic 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掃描dao層
然后配置MapperScannerConfigurer掃描dao層，新建類MyBatisScannerConfig代碼如下（注意與MyBatisConfig不要寫在一個類里）：
import org.mybatis.spring.mapper.MapperScannerConfigurer;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic class MyBatisScannerConfig { @Bean public MapperScannerConfigurer MapperScannerConfigurer() { MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer(); mapperScannerConfigurer.setBasePackage("com.example.*.dao"); mapperScannerConfigurer.setSqlSessionFactoryBeanName("sqlSessionFactory"); return mapperScannerConfigurer; }}6. 開啟數據庫事務（必須）代碼如下
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;@Configurationpublic class TransactionConfig implements TransactionManagementConfigurer{ @Autowired private DataSource dataSource; @Bean(name = "transactionManager") @Override public PlatformTransactionManager annotationDrivenTransactionManager() { return new DataSourceTransactionManager(dataSource); }}7. 實戰
配置大致就是如此，然后就是新建java bean（省略，文章底部有源碼地址）
新建mapper.xml文件（省略，文章底部有源碼地址，關于mapper.xml 文件編寫的疑問可以看我以前的springmvc＋mybatis 系列文章）
新建dao層。代碼如下：
import java.util.List;import java.util.Map;import com.example.base.model.User;import com.example.config.MyBatisRepository;public interface UserDao { public List<User> getList(Map<String,Object> map);}service層要在實現類上添加@service注解，代碼如下：
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;@Servicepublic class UserServiceImpl implements UserService { @Autowired private UserDao userDao; public Object getList(Map<String, Object> map) { return userDao.getList(map); }}controller層也要加@controller注解代碼如下：
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<String, Object> map = CommonUtil.getParameterMap(request); return new ResponseEntity<Object>(userService.getList(map), HttpStatus.OK); } }然后在啟動入口類中掃描定義的這些配置累（配置包名可卻省只寫部分包名）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")@SpringBootApplicationpublic 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); } }}總結
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