=============
后端_用户注册
=============

用户注册：

- 检查是否可以注册，若可以则将账号密码等用户信息保存到数据库中
- 为用户生成令牌
- 将令牌和用户的信息保存在Redis中
- 将令牌返回前端

1 视图对象

1.1 注册参数视图对象

/ysdblog-api/src/main/java/com/weihome/ysdblog/vo/param/RegisterParam.java：

@Data
public class RegisterParam {
    private String account;
    private String nickname;
    private String password;
}

2 用户服务

2.1 用户服务接口

/ysdblog-api/src/main/java/com/weihome/ysdblog/service/UserService.java：

public interface UserService {
    ...
    /**
     * 根据账号查询用户
     */
    public User findUserByAccount(String account);
    /**
     * 添加用户
     */
    public void add(User user);
    ...
}

2.2 用户服务实现

/ysdblog-api/src/main/java/com/weihome/ysdblog/service/impl/UserServiceImpl.java：

...
public class UserServiceImpl implements UserService {
    ...
    @Override
    public User findUserByAccount(String account) {
        LambdaQueryWrapper<User> queryWrapper =
            new LambdaQueryWrapper<>();
        queryWrapper.eq(User::getAccount, account);
        queryWrapper.last("limit 1");
        return userMapper.selectOne(queryWrapper);
    }

    @Override
    public void add(User user) {
        userMapper.insert(user);
    }
    ...
}

3 登录服务

3.1 登录服务接口

/ysdblog-api/src/main/java/com/weihome/ysdblog/service/LoginService.java：

public interface LoginService {
    ...
    /**
     * 用户注册
     */
    public Result register(RegisterParam registerParam);
    ...
}

3.2 登录服务实现

/ysdblog-api/src/main/java/com/weihome/ysdblog/service/impl/LoginServiceImpl.java：

...
public class LoginServiceImpl implements LoginService {
    ...
    @Override
    @Transactional
    public Result register(RegisterParam registerParam) {
        String account = registerParam.getAccount();
        String nickname = registerParam.getNickname();
        String password = registerParam.getPassword();

        // 检查账号昵称密码是否合法
        if (StringUtils.isBlank(account) ||
            StringUtils.isBlank(nickname) ||
            StringUtils.isBlank(password))
            return Result.fail(
                ErrorCode.PARAM_ERROR.getCode(),
                ErrorCode.PARAM_ERROR.getMsg());

        // 检查账号是否已存在
        User user = userService.findUserByAccount(account);
        if (user != null)
            return Result.fail(
                ErrorCode.ACCOUNT_EXIST.getCode(),
                ErrorCode.ACCOUNT_EXIST.getMsg());

        // 添加用户
        user = new User();
        user.setAccount(account);
        user.setAdmin(0);
        user.setAvatar("/static/img/logo.b3a48c0.png");
        user.setCreateDate(System.currentTimeMillis());
        user.setDeleted(0);
        user.setEmail("");
        user.setLastLogin(System.currentTimeMillis());
        user.setMobilePhoneNumber("");
        user.setNickname(nickname);
        user.setPassword(DigestUtils.md5Hex(password + salt));
        user.setSalt("");
        user.setStatus("");
        userService.add(user);

        // 为该用户生成令牌
        String token = JWTUtils.createToken(user.getId());

        // 将令牌和用户的对应关系保存到Redis中并将过期时间设置为1天
        redisTemplate.opsForValue().set("TOKEN_" + token,
            JSON.toJSONString(user), 1, TimeUnit.DAYS);

        // 返回令牌给前端
        return Result.success(token);
    }
    ...
}

通过Transactional注解启用事务，Redis出错数据库回滚。

4 注册控制器

/ysdblog-api/src/main/java/com/weihome/ysdblog/controller/RegisterController.java：

@RestController
@RequestMapping("register")
public class RegisterController {
    @Autowired
    private LoginService loginService;
    /**
     * 用户注册
     */
    @PostMapping
    public Result register(@RequestBody RegisterParam registerParam) {
        return loginService.register(registerParam);
    }
}

5 运行测试

Postman
    POST
        localhost:8888/register
    Body
{
    "account": "user_a",
    "nickname": "nickname_a",
    "password": "123456"
}
-------------------------------
{
    "success": true,
    "code": 200,
    "msg": "success",
    "data": "eyJhbGciOiJIUzI1NiJ9.eyJleHAiOjE2NDk1ODQyMjcsInVzZXJJZCI6MTUwOTM2MzE2Mjc2MjE4Njc1NCwiaWF0IjoxNjQ4Njk1MTk1fQ.cHFM0rmfQvr6frtWJaC1citGTESGt0b25FOBNwPgdlY"
}

检查ysdblogdb库t_user表中的新增用户记录。

检查Redis库，新增如下键值对：

键：TOKEN_eyJhbGciOiJIUzI1NiJ9.eyJleHAiOjE2NDk1ODQyMjcsInVzZXJJZCI6MTUwOTM2MzE2Mjc2MjE4Njc1NCwiaWF0IjoxNjQ4Njk1MTk1fQ.cHFM0rmfQvr6frtWJaC1citGTESGt0b25FOBNwPgdlY
值：{"account":"user_f","admin":0,"avatar":"/static/img/logo.b3a48c0.png","createDate":20220331105315,"deleted":0,"email":"","id":1509363162762186754,"lastLogin":20220331105315,"mobilePhoneNumber":"","nickname":"nickname_f","password":"01bec61b2f05979aed0c4935bd8c7653","salt":"","status":""}