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SpringMVC主要是controller、service、dao（mapper）层交互

controller：处理数据请求的接口

service：处理请求的数据

dao（mapper）：对数据进行持久化

下面我将对controller和service.impl进行讲解

1.controller层 （代码讲解）:

对于需要返回的数据：比如登录、获取用户信息等操作都是直接返回数据的

对于不需要返回数据：比如进行注册、注销、修改密码等操作，这些只需要知道是否执行成功即可，不需要返回的数据，需要对其结果进行布尔值判断，如果成功则返回Result.ok，失败则返回Result.fail的结果。

你会发现我使用的是@RequiredArgsConstructor，而不是@Autowired，其实两种方式可以提供依赖注入，但是我个人习惯于使用@RequiredArgsConstructor的方式进行依赖注入。

@RequiredArgsConstructor通过构造函数为不可变字段提供依赖注入，适用于需要final字段的情况。@Autowired则提供更灵活的注入方式，可以用于字段、构造函数或方法，不需要字段是final。

具体详细的过程如下所示：

@Tag(name = "用户接口管理")
@RestController
@RequestMapping("/user")
@RequiredArgsConstructor
public class UserController {private final IUserService userService;@Operation(summary = "用户密码验证登录")@PostMapping("/login")public Result<String> login(@RequestBody UserLoginForm userLoginForm){return Result.ok(userService.login(userLoginForm));}@Operation(summary = "用户短信验证登录")@PostMapping("/loginBySms")public Result<String> loginBySms(@RequestBody UserLoginSmsForm userLoginSmsForm){return Result.ok(userService.loginBySms(userLoginSmsForm));}@Operation(summary = "用户注册")@PostMapping("/register")public Result<Void> register(@RequestBody UserRegisterForm userRegisterForm){if(userService.register(userRegisterForm)){return  Result.fail();}return Result.ok();}@Operation(summary = "用户修改密码")@PutMapping("/modifyPassword")public Result<Void> modifyPassword(@RequestBody UserModifyPasswordForm userModifyPasswordForm){if(!userService.modifyPassword(userModifyPasswordForm)){return Result.fail();}return Result.ok();}@Operation(summary = "用户注销")@DeleteMapping("/logout")public Result<Void> logout(){if(!userService.logout()){return Result.fail();}return Result.ok();}@Operation(summary = "获取用户信息")@GetMapping("/info")public Result<UserInfoVo> info(){return Result.ok(userService.info());}}

2.service层：

service层一般的写法是先写service的接口类，再写对应的实现类进行实现，如下所示：

service接口：

public interface IUserService extends IService<User> {String login(UserLoginForm userLoginForm);String loginBySms(UserLoginSmsForm userLoginSmsForm);boolean register(UserRegisterForm userRegisterForm);UserInfoVo info();boolean modifyPassword(UserModifyPasswordForm userModifyPasswordForm);boolean logout();
}

service接口实现类（service.impl）中的代码：

观察下面的代码：

对于不正确的数据，我会选择抛出自定义异常BusinessRuntimeException进行处理，

对于需要返回布尔类型直接对返回的结果行rows==1进行判断即可，

对于注销用户操作，不要直接删除数据中的数据，需要进行逻辑删除，而不是直接真正的删除数据库中的数据

对于用户的密码相关操作，因为这里的密码是用MD5进行加密的，所以对于密码的校验操作需要考虑MD5的转换

对于用户登录操作，需要返回token值，这样便于操作请求时进行校验操作

@Service
@RequiredArgsConstructor
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {private final UserMapper userMapper;private final RedisTemplate<String,Object> redisTemplate;@Overridepublic String login(UserLoginForm userLoginForm) {User user = selectUserByName(userLoginForm.getUsername());//用户不存在if(user == null){throw new BusinessRuntimeException(ResultCodeEnum.ACCOUNT_ERROR);}//密码不正确if(!user.getPassword().equals(MD5.encrypt(userLoginForm.getPassword()))){throw new BusinessRuntimeException(ResultCodeEnum.PASSWORD_ERROR);}//账号已经被注销了if(user.getIsDelete()==1){throw new BusinessRuntimeException(ResultCodeEnum.ACCOUNT_STOP);}Map<String,Object> claims = new HashMap<>();claims.put("id",user.getId());claims.put("username",user.getUsername());claims.put("profile",user.getProfile());//生成tokenString token = JwtUtils.generateJwt(claims);redisTemplate.opsForValue().set(RedisConstant.USER_CHECK_TOKEN,token,2, TimeUnit.HOURS);return token;}public User selectUserByName(String username){return userMapper.selectOne(new LambdaQueryWrapper<User>().eq(User::getUsername,username));}@Overridepublic String loginBySms(UserLoginSmsForm userLoginSmsForm) {User user = userMapper.selectOne(new LambdaQueryWrapper<User>().eq(User::getUsername,userLoginSmsForm.getPhone()));//用户不存在if(user == null){throw new BusinessRuntimeException(ResultCodeEnum.ACCOUNT_ERROR);}//账号已经被注销了if(user.getIsDelete()==1){throw new BusinessRuntimeException(ResultCodeEnum.ACCOUNT_STOP);}//未输入验证码if(StringUtils.isEmpty(userLoginSmsForm.getVerifyCode())){throw new BusinessRuntimeException(ResultCodeEnum.VALIDATECODE_EMPTY);}String verifyCode = (String) redisTemplate.opsForValue().get(RedisConstant.USER_LOGIN_SMS_CODE);//验证码过期或未发送验证码if(StringUtils.isEmpty(verifyCode)){throw new BusinessRuntimeException(ResultCodeEnum.VALIDATECODE_EXPIRED);}//验证码错误if(!verifyCode.equals(userLoginSmsForm.getVerifyCode())){throw new BusinessRuntimeException(ResultCodeEnum.VALIDATECODE_ERROR);}Map<String,Object> claims = new HashMap<>();claims.put("id",user.getId());claims.put("username",user.getUsername());claims.put("profile",user.getProfile());//生成tokenString token = JwtUtils.generateJwt(claims);redisTemplate.opsForValue().set(RedisConstant.USER_CHECK_TOKEN,token,2, TimeUnit.HOURS);return token;}@Overridepublic boolean register(UserRegisterForm userRegisterForm) {String username = userRegisterForm.getUsername();String password = userRegisterForm.getPassword();//输入的密码为空if(StringUtils.isEmpty(password) || StringUtils.isEmpty(userRegisterForm.getPasswordAgain())){throw new BusinessRuntimeException(ResultCodeEnum.PASSWORD_ERROR);}//两次输入的密码不一致if(!password.equals(userRegisterForm.getPasswordAgain())){throw new BusinessRuntimeException(ResultCodeEnum.PASSWORD_ERROR);}//注册的用户名不存在if(selectUserByName(username) == null){User user = new User();user.setGender(0);user.setRole(0);user.setUsername(username);user.setPassword(MD5.encrypt(password));user.setIsDelete(0);user.setCreateTime(new Date());user.setUpdateTime(new Date());int rows = userMapper.insert(user);return rows == 1;}return false;}@Overridepublic UserInfoVo info() {Long userId = UserHolder.getUserId();User user = userMapper.selectById(userId);return BeanUtil.copyProperties(user, UserInfoVo.class);}@Overridepublic boolean modifyPassword(UserModifyPasswordForm userModifyPasswordForm) {Long userId = UserHolder.getUserId();User user = userMapper.selectById(userId);String password = userModifyPasswordForm.getPassword();String newPassword = userModifyPasswordForm.getNewPassword();//校验密码if(!user.getPassword().equals(MD5.encrypt(password))){throw new BusinessRuntimeException(ResultCodeEnum.PASSWORD_ERROR);}user.setPassword(MD5.encrypt(newPassword));int rows = userMapper.updateById(user);return rows == 1;}@Overridepublic boolean logout() {Long userId = UserHolder.getUserId();User user = userMapper.selectById(userId);//设置逻辑删除状态user.setIsDelete(1);user.setUpdateTime(new Date());UserHolder.removeUserId();return true;}
}

3.dao（mapper）层：

如果你学过Mybatis-plus，你就会发现原来，我使用的是Mybatis-plus进行操作，非常便利

public interface UserMapper extends BaseMapper<User> {
}