IDEA整合springBoot+myBatis

1.新建项目

①Create New Project

②点击左侧Spring Initialize 

　右侧Project SDK选择1.8、选择Default

　点击next，下一步

③Group、Artifact可改可不改，修改是全小写

   点击next，下一步

④点击左侧web 选中中间web框

　在点击左侧SQL选中中间JPA、MySQL、JDBC、MyBatis

    点击next，下一步

⑤选择项目名称和项目路径

    点击finish，完成

2.项目内部结构

3项目搭建

package com.springbootmybatis.springbootdome.controller;

import com.springbootmybatis.springbootdome.domain.User;
import com.springbootmybatis.springbootdome.service.DomeService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/user")
public class DomeController {
    @Autowired
    private DomeService domeService;

    @RequestMapping("/getUser")
    private User getUser(String userName){
        return domeService.getUser(userName);
    }
}

package com.springbootmybatis.springbootdome.service;

import com.springbootmybatis.springbootdome.domain.User;
import com.springbootmybatis.springbootdome.mapper.DomeMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class DomeService {
    @Autowired
    private DomeMapper domeMapper;

    public User getUser(String userName) {
        return domeMapper.getUser(userName);
    }
}

package com.springbootmybatis.springbootdome.mapper;

import com.springbootmybatis.springbootdome.domain.User;
import org.apache.ibatis.annotations.Param;

public interface DomeMapper {

    User getUser(@Param("userName") String userName);
}

package com.springbootmybatis.springbootdome;

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

@SpringBootApplication
@MapperScan("com.springbootmybatis.springbootdome.mapper")
public class SpringbootdomeApplication {

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

}

<?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.springbootmybatis.springbootdome.mapper.DomeMapper" >
    <select id="getUser" resultType="com.springbootmybatis.springbootdome.domain.User">
        SELECT
            *
        FROM
            `user`
        WHERE
            userName = #{userName}
    </select>
</mapper>

spring:
  profiles:
    active: dev

server:
  port: 8080

spring:
  datasource:
    username: root
    password:
    url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC
    driver-class-name: com.mysql.cj.jdbc.Driver

mybatis:
  mapper-locations: classpath:mapper/*Mapper.xml
  type-aliases-package: com.springbootmybatis.springbootdome.domain

#showSql
logging:
  level:
    com:
      example:
        mapper : debug

<?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>2.1.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.springbootmybatis</groupId>
    <artifactId>springbootdome</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springbootdome</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.1</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

 sql

 

注意事项:配置文件中不要出现中文注释，配置文件报红时，试试ctrl+tab，

　　       springboot的启动类不能放在java目录下！！！必须要个包将它包进去

　　　　否则会报错误：

　　　　Your ApplicationContext is unlikely to start due to a @ComponentScan of the default package.
　　　　controller、service、dao层和实体类不能放在启动类上级目录，因为启动类只能扫描到同级目录或下级目录。

为什么两个配置文件:

　　在项目中配置多套环境的配置方法。
　　因为现在一个项目有好多环境，开发环境，测试环境，准生产环境，生产环境，每个环境的参数不同，所以我们就可以把每个环境的参数配置到yml文件中，这样在想用哪个环境的时候只需要在主配置

　　文件中将用的配置文件写上就行如application.yml

　　笔记：在Spring Boot中多环境配置文件名需要满足application-{profile}.yml的格式，其中{profile}对应你的环境标识，比如：

　　application-dev.yml：开发环境
　　application-test.yml：测试环境
　　application-prod.yml：生产环境
　　至于哪个具体的配置文件会被加载，需要在application.yml文件中通过spring.profiles.active属性来设置，其值对应{profile}值。

4.启动项目

　　

将来的你一定会感谢今天努力的自己！加油！　　

　　　　　　　　　　　~送给每一位正在拼搏的年轻人！