Spring Boot中使用Mybatis

一、步骤

• 导入依赖：MySQL驱动、Druid依赖、MyBatis与Spring Boot整合依赖、Lombok依赖
• 在Service接口实现类上添加@Service注解
• 在Dao接口上添加@Mapper注解
• 在pom中将dao目录注册为资源目录
• 在配置文件中注册映射文件、实体类别名，及数据源

二、需求

完成一个简单注册功能

三、定义工程

四、导入依赖

修改pom.xml配置,导入三个依赖：mybatis与Spring Boot整合依赖、mysql驱动依赖与Druid数据源依赖。

<?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">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.6.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.sping.boot.demo</groupId>
	<artifactId>01-primary</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>01-primary</name>
	<description>Demo project for Spring Boot</description>
 
	<properties>
		<java.version>1.8</java.version>
	</properties>
 
	<dependencies>
		<!--mybatis与spring boot整合依赖-->
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>1.3.2</version>
		</dependency>
 
		<!--mysql驱动-->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.47</version>
		</dependency>
 
		<!-- druid驱动 -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid</artifactId>
			<version>1.1.12</version>
		</dependency>
 
		<!--tomcat内置的JSP解析器-->
		<dependency>
			<groupId>org.apache.tomcat.embed</groupId>
			<artifactId>tomcat-embed-jasper</artifactId>
		</dependency>
 
		<!--lombok-->
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
		</dependency>
 
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
 
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>
 
 
	<build>
		<resources>
			<!--注册Dao包目录下Mybatis映射文件资源目录-->
			<resource>
				<directory>src/main/java</directory>
				<includes>
					<include>**/*.xml</include>
				</includes>
			</resource>
 
			<!--注册webapp目录为资源目录-->
			<resource>
				<directory>src/main/webapp</directory>
				<targetPath>META-INF/resources</targetPath>
				<includes>
					<include>**/*.*</include>
				</includes>
			</resource>
		</resources>
 
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
 
</project>

五、创建控制层

五、定义Service接口及实现类

六、定义实体类及DB表

七、定义DB表

八、定义Dao接口

Dao接口上要添加@Mapper注解

九、定义映射文件

十、修改主配置文件

在主配置文件中主要完成以下几件工作

• 注册映射文件
• 注册实体类别名
• 注册数据源

# 视图的前辍与后辍
spring:
  mvc:
    view:
      prefix: /
      suffix: .jsp
 
  # 注册数据源
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql:///test?useUnicode=true&characterEncoding=utf-8
    username: root
    password: root
 
mybatis:
  # 注册映射文件
  mapper-locations: classpath:com/abc/dao/*.xml
  # 注册实体类别名
  type-aliases-package: com.abc.bean

十一、创建index.jsp

十二、创建welcome.jsp

   jsp/welcome.jsp目录

十三、测试