基于springboot+mybatis-plus的登陆系统开发（含完整代码）

以下是一个简单的Spring Boot + MyBatis-Plus登录系统的示例代码。

1. 引入依赖（pom.xml）:

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-plus-boot-starter</artifactId>
        <version>3.4.3</version>
    </dependency>
    <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus-extension</artifactId>
        <version>3.4.3</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <scope>runtime</scope>
    </dependency>
</dependencies>

2. 配置数据库和MyBatis-Plus（application.properties）:

spring.datasource.url=jdbc:mysql://localhost:3306/your_database?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=yourpassword
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
 
mybatis-plus.mapper-locations=classpath:/mappers/*.xml
mybatis-plus.type-aliases-package=com.example.demo.model

3. 创建实体类（User.java）:

public class User {
    private Long id;
    private String username;
    private String password;
    // getters and setters
}

4. 创建Mapper接口（UserMapper.java）:

@Mapper
public interface UserMapper extends BaseMapper<User> {
    // 这里可以添加自定义方法，但对于登录系统，默认的CRUD方法就足够了
}

5. 创建Service接口和实现类（UserService.java, UserServiceImpl.java）:

public interface UserService {
    User login(String username, String password);
}
 
@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private UserMapper userMapper;
 
    @Override
    public User login(String username, String password) {
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("username", username);
        queryWrapper.eq("password", password);
        return userMapper.selectOne(queryWrapper);
    }
}

6. 创建Controller（UserController.java）:

@RestController
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserService userService;
 
    @PostMapping("/login")
    public User login(@RequestParam String username, @RequestParam String password) {
        return userService.log