專案結構：

pom.xml:

<?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>

    <groupId>com.mybatis</groupId>
    <artifactId>springboot-maybatis</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>springboot-maybatis</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.22</version>
        </dependency>
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>5.1.2</version>
        </dependency>
    </dependencies>

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


</project>
 

實體類：

         用了lombok，不需要再寫get、set、tostring方法了，直接用註解即可，程式碼也更加清晰。

package com.mybatis.springbootmaybatis.pojo;

import lombok.Getter;
import lombok.Setter;
import lombok.ToString;

/**
 * @author: Lucifer
 * @create: 2018-10-21 16:52
 * @description:
 **/
@Getter
@Setter
@ToString
public class teacher {
    private Integer id;
    private String name;
}
 

UserService:

package com.mybatis.springbootmaybatis.service;

import com.github.pagehelper.PageInfo;


public interface UserService {

    PageInfo selectByPage(Integer pageNum, Integer pageSize);

}

 UserServiceImp:

package com.mybatis.springbootmaybatis.service;

import com.github.pagehelper.PageInfo;
import com.mybatis.springbootmaybatis.mapper.UserMapper;
import com.mybatis.springbootmaybatis.pojo.teacher;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * @author: Lucifer
 * @create: 2018-10-21 17:50
 * @description:
 **/
@Service
public class UserServiceimp implements UserService {
    @Autowired
    UserMapper userMapper;

    @Override
    public PageInfo selectByPage(Integer pageNum, Integer pageSize) {

        List<teacher> userList=userMapper.selectByPage(pageNum-1,pageSize);

        // 用PageInfo對結果進行包裝
        PageInfo pageInfo = new PageInfo(userList);

        return pageInfo;
    }
}
 

UserController:

package com.mybatis.springbootmaybatis.controller;

import com.github.pagehelper.PageInfo;

import com.mybatis.springbootmaybatis.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;


/**
 * @author: Lucifer
 * @create: 2018-10-21 16:52
 * @description:
 **/

@RequestMapping("/user")
@RestController
public class UserController {

    @Autowired
    UserService userService;


    @GetMapping("/findByPage/{pageNum}/{pageSize}")
    public PageInfo findByPageList(@PathVariable("pageNum") Integer pageNum, @PathVariable("pageSize") Integer pageSize){
       System.out.println("pageNum:"+pageNum);
        System.out.println("pageSize:"+pageSize);
        PageInfo pageInfo=userService.selectByPage(pageNum,pageSize);
        return pageInfo;
    }


}

啟動類：

@MapperScan註解加在啟動類上，就不需要在每個mapper介面中加上@mapper註解了。 

package com.mybatis.springbootmaybatis;

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

@SpringBootApplication
@MapperScan(basePackages = "com.mybatis.springbootmaybatis.mapper")
public class SpringbootMaybatisApplication {

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

application.yml:

       springboot的全域性配置檔案：配置資料庫連線資訊，本demo可以不用開啟駝峰命名規則，另外指定了mapper檔案的位置

#資料庫連線配置#
spring:
  datasource:
    username: root
    password: 123456
    url: jdbc:mysql://localhost:3306/test
    driver-class-name: com.mysql.jdbc.Driver
#開啟駝峰命名、指定mapper檔案位置#
mybatis:
  configuration:
    map-underscore-to-camel-case: true
  mapper-locations: classpath:mybatis/*.xml

#控制檯列印sql語句，指定自己的mapper介面路徑#
logging:
  level:
    com.mybatis.springbootmaybatis.mapper: debug

mapper.xml: 

<?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.mybatis.springbootmaybatis.mapper.UserMapper">


    <select id="selectByPage" resultType="com.mybatis.springbootmaybatis.pojo.teacher">
        select *
        from teacher limit
             #{pageNum},
             #{pageSize}
    </select>


</mapper>

這裡用的是postman測試請求：如圖：