First, set up springboot development environment

Requirements: Use springboot build a project, write a controller controller using a browser to access normal

springboot1.x version -> Based spring 4 -> jdk1

Course: springboot2.x version -> Based spring 5 -> jdk1.8

The project must be set jdk version 1.8

1. Set pom.xml file properties in JDK version 1,8

2. Add dependence

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-web</artifactId>

<version>2.1.4.RELEASE</version>

</dependency>

3. Create a controller

4. Create a startup class

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

@SpringBootApplication
@MapperScan("com.dao")
public class Start {
    public static void main(String[] args) {
        SpringApplication.run(Start.class,args);
    }
}

5.springboot配置文件，默认是放在resources，并且名字叫做application.properties

6.@SpringBootApplication注解的使用

二、整合Mybatis

添加依赖spring+mybatis+mysql

<groupId>org.mybatis.spring.boot</groupId>

<artifactId>mybatis-spring-boot-starter</artifactId>

</dependency>

<groupId>mysql</groupId>

<artifactId>mysql-connector-java</artifactId>

</dependency>

2.配置applicationContext.xml (被application.properties替换)

　　　a) 引入小配置文件

　　　b) 配置数据源

　　　c) SqlSessionFactoryBean

　　　d) MapperScannerConfigurer

#配置项目名
#server.servlet.context-path=/..

#配置数据库连接
spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.username=root
spring.datasource.password=root

#注册mapper文件
mybatis.mapper-locations=classpath:mapper/*Mapper.xml

#给实体类起别名
mybatis.type-aliases-package=com.entity
#
pagehelper.helper-dialect=mysql