框架的调用关系：
1、创建一个springboot项目
2、在pom.xml文件里添加jar包
<!--springBoot整合mvc-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency><!--springBoot整合测试方法-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency><!--支持热部署 开发阶段有效-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
</dependency><!--引入插件lombok 自动的set/get/构造方法插件 -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency><!--mybatis依赖包-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.2.0</version>
</dependency><!--jdbc依赖包-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
3、创建pojo类进行数据封装
package com.jt.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.Accessors;import java.io.Serializable;
@Data
@Accessors(chain = true)
@NoArgsConstructor
@AllArgsConstructor
public class User implements Serializable {
private Integer id;
private String name;
private Integer age;
private String sex;
}
4、创建mapper持久层
4.1、创建UserMapper接口
package com.jt.mapper;
import com.jt.pojo.User;
import java.util.List;
public interface UserMapper {
List<User> add1();
}
4.2、创建UserMapper的实现类UserMapper.xml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.jt.mapper.UserMapper">
<select id="add1" resultType="com.jt.pojo.User">
select * from demo_user
</select>
</mapper>
5、创建Service业务层
5.1、创建UserService接口
package com.jt.service;
import com.jt.pojo.User;
import java.util.List;
public interface UserService {
List<User> add1();
}
5.2、创建UserService的UserServiceImpl接口实现类
package com.jt.service;
import com.jt.mapper.UserMapper;
import com.jt.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class UserServiceImpl implements UserService{
@Autowired
private UserMapper userMapper;
@Override
public List<User> add1() {
return userMapper.add1();
}
}
6.、创建UserController控制层
package com.jt.controller;
import com.jt.pojo.User;
import com.jt.service.UserService;
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;
@RestController //@Controller 将该类交给Spring容器管理 +//@ResponseBody 业务返回值时,将数据转化为JSON.
public class UserController {
@Autowired
private UserService userService;
@RequestMapping("add1")
public List<User> add1(){
return userService.add1();
}
}
7、编辑application.yml核心配置文件
#语法: 1.key:(空格)value结构
server:
port: 8090#整合数据源
spring:
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/jt?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf8&autoReconnect=true&allowMultiQueries=true
username: root
password: root#SpringBoot整合mybatis
mybatis:
#指定别名包
type-aliases-package: com.jt.pojo
#加载指定的xml映射文件
mapper-locations: classpath:/mybatis/mappers/*.xml
#开启驼峰映射
configuration:
map-underscore-to-camel-case: true
8、给启动类添加@MapperScan注解
package com.jt;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
//根据包扫描路径，扫描全部的mapper接口文件
@MapperScan("com.jt.mapper")
public class SpringbootSsm998Application {
public static void main(String[] args) {
SpringApplication.run(SpringbootSsm998Application.class, args);
}
}
注意：
1、端口号冲突会导致启动类无法启动