SpringBoot入门整合Mybatis和Thymeleaf

使用Idea开始第一个Spingboot项目，整合Mybatis和Thymeleaf完成简单项目框架搭建。

整体项目结构

开始

1、new--project,选择Spring Initializr

2、修改项目的信息，我这里使用默认

3、选择依赖，入门项目搭建，选择两个简单的就好。

web依赖

数据库驱动

4、项目搭建完成，然后再引入mybatis依赖和Thymeleaf依赖

         
        
            org.springframework.boot
            spring-boot-starter-thymeleaf
        
        
        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
            1.3.2
        

5、配置文件application.properties(我修改成了application.yml文件)

spring:
  datasource:
    driverClassName: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql:///test?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC
    username: root
    password: 123456

mybatis:
  #mapper.xml配置，在resources文件夹下创建mapper文件夹
  mapper-locations: classpath:mapper/*.xml
  configuration:
    #sql日志
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
  #别名配置
  type-aliases-package: com.example.demo.entity

项目结构搭建

创建测试数据库test以及表user，然后创建controller、service、mapper。

数据库表

DROP TABLE IF EXISTS `user`;
CREATE TABLE `user`  (
  `id` int(10) NOT NULL AUTO_INCREMENT,
  `username` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 19 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;

INSERT INTO `user` VALUES (1, '刘备');
INSERT INTO `user` VALUES (2, '张飞');
INSERT INTO `user` VALUES (3, '许褚');
INSERT INTO `user` VALUES (4, '张辽');
INSERT INTO `user` VALUES (5, '刘备');
INSERT INTO `user` VALUES (6, '马岱');

DemoApplication.java

@SpringBootApplication
@MapperScan("com.example.demo.dao")
public class DemoApplication {

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

}

User.java

public class User implements Serializable {
    private static final long serialVersionUID = 924072218502482859L;
    
    private Integer id;
    
    private String username;


    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

}

UserController.java

@Controller
@RequestMapping("user")
public class UserController {
    /**
     * 服务对象
     */
    @Resource
    private UserService userService;

    /**
     * 通过主键查询单条数据
     *
     * @param id 主键
     * @return 单条数据
     */
    @GetMapping("queryById")
    public String selectOne(Integer id, Model model) {
        User user = userService.queryById(id);
        model.addAttribute("result",user);
        return "index";
    }
    
}

UserService,java

public interface UserService {

    /**
     * 通过ID查询单条数据
     *
     * @param id 主键
     * @return 实例对象
     */
    User queryById(Integer id);
}

UserServiceImpl.java

@Service("userService")
public class UserServiceImpl implements UserService {
    @Resource
    private UserDao userDao;

    /**
     * 通过ID查询单条数据
     *
     * @param id 主键
     * @return 实例对象
     */
    @Override
    public User queryById(Integer id) {
        return this.userDao.queryById(id);
    }
}

UserDao.java

public interface UserDao {

    /**
     * 通过ID查询单条数据
     *
     * @param id 主键
     * @return 实例对象
     */
    User queryById(Integer id);
}

UserMapper.xml

    
    
        select
          id, username
        from
        `user`
        where id = #{id}
    

index.html

    
    


    ID：

    姓名：

测试