SpringBoot整合MyBatis

1.加入mybatis-spring-boot-stater的Maven依赖
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.1.1</version>
        </dependency>

2.配置数据源
在src/main/resource中，application.properties配置文件中，这里面添加了一些数据库连接的信息
复制代码
spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

3.代码注入数据源
package com.example;

import javax.sql.DataSource;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.core.env.Environment;
import org.springframework.web.servlet.DispatcherServlet;

import com.alibaba.druid.pool.DruidDataSource;
import com.example.Listener.IndexListener;
import com.example.filter.IndexFilter;
import com.example.servlet.MyServlet;

@SpringBootApplication
public class SpringBootSimpleApplication {
    @Autowired
    private Environment env;
    
    @Bean
    public DataSource dataSource() {
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setUrl(env.getProperty("spring.datasource.url"));
        dataSource.setUsername(env.getProperty("spring.datasource.username"));//用户名
        dataSource.setPassword(env.getProperty("spring.datasource.password"));//密码
        dataSource.setDriverClassName(env.getProperty("spring.datasource.driver-class-name"));
        dataSource.setInitialSize(2);
        dataSource.setMaxActive(20);
        dataSource.setMinIdle(0);
        dataSource.setMaxWait(60000);
        dataSource.setValidationQuery("SELECT 1");
        dataSource.setTestOnBorrow(false);
        dataSource.setTestWhileIdle(true);
        dataSource.setPoolPreparedStatements(false);
        return dataSource;
    }

    public static void main(String[] args) {
        SpringApplication.run(SpringBootSimpleApplication.class, args);
    }
}


4.增加MyBatis的配置
MyBatisConfig.java类：

package com.example.mybatis;

import javax.sql.DataSource;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
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.EnableTransactionManagement;
import org.springframework.transaction.annotation.TransactionManagementConfigurer;

@Configuration
//加上这个注解，使得支持事务
@EnableTransactionManagement
public class MyBatisConfig implements TransactionManagementConfigurer {
    @Autowired
    private DataSource dataSource;
    
    @Override
    public PlatformTransactionManager annotationDrivenTransactionManager() {
        return new DataSourceTransactionManager(dataSource);
    }
    
    @Bean(name = "sqlSessionFactory")
    public SqlSessionFactory sqlSessionFactoryBean() {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        bean.setDataSource(dataSource);

        try {
            return bean.getObject();
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }

    @Bean
    public SqlSessionTemplate sqlSessionTemplate(SqlSessionFactory sqlSessionFactory) {
        return new SqlSessionTemplate(sqlSessionFactory);
    }
}

MyBatisMapperScannerConfig.java类：

package com.example.mybatis;

import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * 扫描mybatis的接口
 */
@Configuration
// 因为这个对象的扫描，需要在MyBatisConfig的后面注入，所以加上下面的注解
@AutoConfigureAfter(MyBatisConfig.class)
public class MyBatisMapperScannerConfig {
    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer() {
        MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();
        //获取之前注入的beanName为sqlSessionFactory的对象
        mapperScannerConfigurer.setSqlSessionFactoryBeanName("sqlSessionFactory");
        //指定xml配置文件的路径
        mapperScannerConfigurer.setBasePackage("com.example.mybatis.mapper");
        return mapperScannerConfigurer;
    }
}

5.mybatis接口配置，这里使用student表作为示例
使用@Mapper注解来标识一个接口为MyBatis的接口，MyBatis会自动寻找这个接口
package com.example.mybatis.mapper;

import java.util.List;
import java.util.Map;

import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

@Mapper
public interface StudentMapper {
    @Select("select * from student;")
    public List<Map<String,Object>> find();
    
    @Insert("insert into student(id,name,age,score_sum,score_avg) "+
            "values(#{id},'Jim',33,200,100)")
    public int insert(@Param("id")int id);
}


6.service业务层调用接口
package com.example.mybatis;

import java.util.List;
import java.util.Map;

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

import com.example.mybatis.mapper.StudentMapper;

@Service
public class StuMybatisService {
    @Autowired
    private StudentMapper studentMapper;
    
    public List<Map<String,Object>> find(){
        return studentMapper.find();
    }
    
    public int insert(int id){
        return studentMapper.insert(id);
    }
}


7.controller控制层调用service业务层
package com.example.mybatis;

import java.util.List;
import java.util.Map;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/stumybatis")
public class StuMybatisController {
    private static Logger logger = LogManager.getLogger(StuMybatisController.class);

    @Autowired
    private StuMybatisService stuMybatisService;

    @RequestMapping("/list")
    public List<Map<String,Object>> getStus(){
        logger.info("从数据库读取Student集合");
        return stuMybatisService.find();
    }
    @RequestMapping("/add")
    public void addStus(){
        logger.info("student表中插入数据");
        stuMybatisService.insert(2);
    }
}

最终启动程序，进行访问：
http://localhost:8080/stumybatis/list
返回结果：
[{"score_sum":180.0,"name":"张三","id":1,"age":25,"score_avg":90.0},{"score_sum":200.0,"name":"Jim","id":2,"age":33,"score_avg":100.0}]

关于MyBatis的注解，有篇文章讲的很清楚，可以参考： http://blog.csdn.net/luanlouis/article/details/35780175