1. 使用Spring Initializr创建一个新的Spring Boot项目

2. 选择以下依赖：

   Spring Web（用于构建Web应用）

   MyBatis Framework（用于整合MyBatis）

   MySQL Driver（用于连接MySQL数据库）

3. 配置数据库链接
   

4. 创建实体类:创建一个实体类，对应数据库中的表

//User类
package com.wfs.springbootcode.pojo;
public class User {
    
    
    private Integer id;
    private String name;
    private Short age;
    private Short gender;
    private String phone;
    public User() {
    
    
    }
    public User(Integer id, String name, Short age, Short gender, String phone) {
    
    
        this.id = id;
        this.name = name;
        this.age = age;
        this.gender = gender;
        this.phone = phone;
    }
    public Integer getId() {
    
    
        return id;
    }
    public void setId(Integer id) {
    
    
        this.id = id;
    }
    public String getName() {
    
    
        return name;
    }
    public void setName(String name) {
    
    
        this.name = name;
    }
    public Short getAge() {
    
    
        return age;
    }
    public void setAge(Short age) {
    
    
        this.age = age;
    }
    public Short getGender() {
    
    
        return gender;
    }
    public void setGender(Short gender) {
    
    
        this.gender = gender;
    }
    public String getPhone() {
    
    
        return phone;
    }
    public void setPhone(String phone) {
    
    
        this.phone = phone;
    }
    @Override
    public String toString() {
    
    
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", gender=" + gender +
                ", phone='" + phone + '\'' +
                '}';
    }
}

5. 创建Mapper接口

package com.wfs.springbootcode.mapper;
import com.wfs.springbootcode.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
import java.util.List;
@Mapper
public interface UserMapper {
    
    
    @Select("SELECT * FROM user")
    List<User> findAll();
}

6. 创建Service层：创建Service接口和实现类，用于处理业务逻辑。

UserService.java

package com.wfs.springbootcode.service;
import com.wfs.springbootcode.pojo.User;
import org.springframework.stereotype.Service;
import java.util.List;
public interface UserService {
    
    
    List<User> getAllUsers();
}

UserServiceImpl.java

package com.wfs.springbootcode.service.impl;
import com.wfs.springbootcode.mapper.UserMapper;
import com.wfs.springbootcode.pojo.User;
import com.wfs.springbootcode.service.UserService;
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;
    /**
     * 获取所有用户信息。
     * @return 返回所有用户的信息列表
     */
    @Override
    public List<User> getAllUsers() {
    
    
        // 从userMapper中获取所有用户信息
        List<User> users = userMapper.findAll();
        // 返回用户信息列表
        return users;
    }
}

7. Controller层

package com.wfs.springbootcode.controller;
import com.wfs.springbootcode.pojo.User;
import com.wfs.springbootcode.service.impl.UserServiceImpl;
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
public class UserController {
    
    
    @Autowired
    private UserServiceImpl  userService;
    /**
     * 处理用户列表请求的控制器方法。
     * 该方法从用户服务中获取所有用户，并将每个用户的信息打印到控制台，最后返回用户列表。
     *
     * @return 返回所有用户的列表
     */
    @RequestMapping("/user/list")
    public List<User> getUserList() {
    
    
        // 从用户服务中获取所有用户
        List<User> users = userService.getAllUsers();
        // 遍历用户列表，将每个用户的信息打印到控制台
        for (User user : users) {
    
    
            System.out.println(user);
        }
        // 返回用户列表
        return users;
    }
}

8. 创建数据库表并插入数据

create database if not exists mybatis;
use mybatis;
create table user(
    id int unsigned primary key auto_increment comment 'ID',
    name varchar(100) comment '姓名',
    age tinyint unsigned comment '年龄',
    gender tinyint unsigned comment '性别, 1:男, 2:女',
    phone varchar(11) comment '手机号'
) comment '用户表';
insert into user(id, name, age, gender, phone) VALUES (null,'白眉鹰王',55,'1','18800000000');
insert into user(id, name, age, gender, phone) VALUES (null,'金毛狮王',45,'1','18800000001');
insert into user(id, name, age, gender, phone) VALUES (null,'青翼蝠王',38,'1','18800000002');
insert into user(id, name, age, gender, phone) VALUES (null,'紫衫龙王',42,'2','18800000003');
insert into user(id, name, age, gender, phone) VALUES (null,'光明左使',37,'1','18800000004');
insert into user(id, name, age, gender, phone) VALUES (null,'光明右使',48,'1','18800000005');

9. 项目目录以及最终效果图