项目开发中不可避免需要跟数据库打交道，作者开发的项目的中广泛使用Mybatis作为ORM框架。
本文主要讲解在Spring Boot项目中 如何整合Mybatis，基于XML方式配置下一篇中会介绍基于 注解方式的配置。

开发环境

• JDK 1.8
• Maven 3.3
• Spring Boot 1.5.8.RELEASE
• Mybatis 3.4.4

代码

首先引入spring-boot-starter-parent:

    <!-- Inherit defaults from Spring Boot -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.8.RELEASE</version>
    </parent>

Mybatis依赖：

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!--mybatis-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.1</version>
        </dependency>

        <!-- db-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.connector.version}</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>${druid.version}</version>
        </dependency>
    </dependencies>

application.yml

mybatis:
    mapper-locations: classpath:mapper/*.xml
    type-aliases-package: springboot.mybatis.model
    type-handlers-package: springboot.mybatis.typehandler
    configuration:
        map-underscore-to-camel-case: true
        default-fetch-size: 100

spring:
    datasource:
       url: jdbc:mysql://localhost:3306/demo?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull
       username: root
       password: root
       driver-class-name: com.mysql.jdbc.Driver

涉及的Mybatis Mapper类和Mapper文件 建议通过Mybatis-Generator来生产，简单、高效。

启动类App

package springboot.mybatis.xml;

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

/**
 * ${DESCRIPTION}
 *
 * @author Ricky Fung
 */
@SpringBootApplication
@MapperScan(basePackages = "com.mindflow.springboot.mybatis.mapper")
public class App {

    public static void main(String[] args) {

        SpringApplication.run(App.class, args);
    }
}

最后，只需要在App类上增加 @MapperScan 注解即可。

源码

传送门：spring-boot-mybatis3-xml-config 查看源码