1.创建项目
1.1修改 pom 文件
<!-- web 启动器 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<!-- Mybatis 启动器 -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.1.1</version>
</dependency>
<!-- mysql 数据库驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- druid 数据库连接池 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.9</version>
</dependency>
1.2添加 application.properties 全局配置文件
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/ssm
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
mybatis.type-aliases-package=com.bjsxt.pojo
1.3数据库表设计
CREATE TABLE `users` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) DEFAULT NULL,
`age` int(11) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
2. 添加用户
2.1创建实体类
public class Users {
private Integer id;
private String name;
private Integer age;
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 Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}
2.2创建 mapper 接口以及映射配置文件
import com.bjsxt.pojo.Users;
public interface UsersMapper {
void insertUser(Users users);
}
<?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.bjsxt.mapper.UsersMapper">
<insert id="insertUser" parameterType="users">
insert into users(name,age) values(#{name},#{age})
</insert>
</mapper>
2.3创建业务层
@Service
@Transactional
public class UsersServiceImpl implements UsersService {
@Autowired
private UsersMapper usersMapper;
@Override
public void addUser(Users users) {
this.usersMapper.insertUser(users);
}
}
2.4创建 Controller
@Controller
@RequestMapping("/users")
public class UsersController {
@Autowired
private UsersService usersService;
/**
* 页面跳转
*/
@RequestMapping("/{page}")
public String showPage(@PathVariable String page){
return page;
}
/**
* 添加用户
*/
@RequestMapping("/addUser")
public String addUser(Users users){
this.usersService.addUser(users);
return "ok";
}
}
2.5编写页面
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>添加用户</title>
</head>
<body>
<form th:action="@{/users/addUser}" method="post">
用户姓名：<input type="text" name="name"/><br/>
用户年龄：<input type="text" name="age"/><br/>
<input type="submit" value="确定"/><br/>
</form>
</body>
</html>
2.6启动类
@SpringBootApplication
@MapperScan("com.bjsxt.mapper") //@MapperScan 用户扫描 MyBatis 的 Mapper
接口
public class App {
public static void main(String[] args) {
SpringApplication.run(App.class, args);
}
}
3.查询用户
3.1在 mapper 接口中以及映射配置文件中添加相关代码
List<Users> selectUsersAll();
<select id="selectUsersAll" resultType="users">
select id,name,age from users
</select>
3.2在业务层中添加查询方法
@Override
public List<Users> findUserAll() {
return this.usersMapper.selectUsersAll();
}
3.3在 Controller 中添加方法
/**
* 查询全部用户
*/
@RequestMapping("/findUserAll")
public String findUserAll(Model model){
List<Users> list = this.usersService.findUserAll();
model.addAttribute("list", list);
return "showUsers";
}
3.4添加页面
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>展示用户数据</title>
</head>
<body>
<table border="1" style="width:300px;">
<tr>
<th>用户 ID</th>
<th>用户姓名</th>
<th>用户年龄</th>
</tr>
<tr th:each="user : ${list}">
<td th:text="${user.id}"></td>
<td th:text="${user.name}"></td>
<td th:text="${user.age}"></td>
</tr>
</table>
</body>
</html>