springboot笔记（2）springboot-Mybatis使用

项目目录结构如下：

├─src
│  ├─main
│  │  ├─java
│  │  │  └─com
│  │  │      └─app
│  │  │          ├─mybatis
│  │  │          │  ├─dataSourceConfig
│  │  │          │  ├─mapper
│  │  │          │  └─mapping
│  │  │          ├─service
│  │  │          │  └─impl
│  │  │          └─springbootController
│  │  └─resources
│  │      └─processes
│  └─test
│      └─java
└─target
├─classes
│  └─com
│      └─app
│          ├─mybatis
│          │  ├─dataSourceConfig
│          │  ├─mapper
│          │  └─mapping
│          ├─service
│          │  └─impl
│          └─springbootController
├─generated-sources
│  └─annotations
├─maven-archiver
└─maven-status
└─maven-compiler-plugin
├─compile
│  └─default-compile
└─testCompile
└─default-testCompile

1、在pom文件中添加依赖

<?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"> <parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.2.RELEASE</version>
<!-- <relativePath/>--> <!-- lookup parent from repository -->
</parent>
<modelVersion>4.0.0</modelVersion>

<artifactId>spring-boot-Mybatis</artifactId>
<properties>
<activiti.version>5.21.0</activiti.version>
</properties>
<dependencies>
<!--spring boot 启动 libs-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<version>1.4.2.RELEASE</version>
</dependency>
<!--springboot web 启动  libs-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>1.4.2.RELEASE</version>
</dependency>
<!--支持使用 JDBC 访问数据库-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
<exclusions>
<exclusion>
<!-- 取消引入tomcat jdbc -->
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-jdbc</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- mybatis相关驱动包-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.1.1</version>
</dependency>
<!-- mysql连接驱动包-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.26</version>
</dependency>
<!-- 连接池-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.27</version>
</dependency>
</dependencies>
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.xml</include>
</includes>
</resource>
</resources>
</build>
</project>

2、在application.properties中配置数据连接

# JDBC 链接
spring.datasource.name=test
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/springboot-Mybatis-Activiti?characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

3、数据源配置

package com.app.mybatis.dataSourceConfig;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.pool.DruidDataSourceFactory;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
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 org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.transaction.annotation.TransactionManagementConfigurer;

import javax.sql.DataSource;
import java.util.Properties;

/**
* springboot集成mybatis的基本入口
* 1）创建数据源
* 2）创建SqlSessionFactory
* MapperScan是扫描mapper文件
*/
@Configuration
@MapperScan(basePackages = "com.app.mybatis.mapper")
@EnableTransactionManagement
public class DataSourceConfig implements TransactionManagementConfigurer {
//注入环境参数，通过Environment获取class：resource资源文件下配置文件信息
@Autowired
private Environment env;
@Autowired
DataSource dataSource;//注入数据源
@Bean(name = "sqlSessionFactory")
public SqlSessionFactory sqlSessionFactoryBean() throws Exception {
SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
// 设置数据源
sqlSessionFactoryBean.setDataSource(dataSource);
// 设置查找器
PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
// 自动扫描mybatis文件
sqlSessionFactoryBean.setMapperLocations(resolver.getResources("classpath:com/app/mybatis/mapping/*.xml"));
return sqlSessionFactoryBean.getObject();
}
@Bean
public SqlSessionTemplate sqlSessionTemplate(SqlSessionFactory sqlSessionFactory) {
return new SqlSessionTemplate(sqlSessionFactory);
}

@Bean
@Override
public PlatformTransactionManager annotationDrivenTransactionManager() {
return new DataSourceTransactionManager(dataSource);
}
}

3、mapper文件

package com.app.mybatis.mapper;

import java.util.List;

/**
* Created by ssjk on 2016/12/18.
*/
public interface LeaveFormMapper {
public List<String> findLeaveFormAll();
}

mapping映射文件

<?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.app.mybatis.mapper.LeaveFormMapper">
<select id="findLeaveFormAll" resultType="String">
SELECT context FROM leave_form
</select>
</mapper>

以上为实现简单的查询

4、编写service服务

package com.app.service.impl;

import com.app.mybatis.mapper.LeaveFormMapper;
import com.app.service.LeaveFormService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
* Created by ssjk on 2016/12/19.
*/
@Service
public class LeaveFormServiceImpl implements LeaveFormService{
@Autowired
private LeaveFormMapper leaveFormMapper;

@Override
public List findLeaveFormAll() {

return leaveFormMapper.findLeaveFormAll();
}
}

5、编写一个Controller供调用

package com.app.springbootController;

import com.app.service.LeaveFormService;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

/**
* Created by ssjk on 2016/12/19.
*/
@RestController
@RequestMapping("/")
public class SpringbootController {
@Autowired
private LeaveFormService leaveFormService;

@RequestMapping("/findAll")
public String findAll() throws JsonProcessingException {
List leaveFormAll = leaveFormService.findLeaveFormAll();
return new ObjectMapper().writeValueAsString(leaveFormAll);
}
}

6、springboot启动入口

package com.app;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;

import java.util.HashMap;

/**
* Created by ssjk on 2016/12/18.
*/
@SpringBootApplication
@ComponentScan
@MapperScan(basePackages="com.app.mybatis.mapper")
public class App {

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

到此springboot与Mybatis集成使用基本完成