2、点评搜索服务&推荐系统 -用户模块 - 实现用户的登录注册登出服务

一、用户服务搭建
用户业务模型后端服务：

用户注册，由于手机号的唯一性，最靠谱的就是使用数据库的唯一索引保证，同时catch duplicatedkey异常，抛出有意义的手机号已注册异常
用户注册，使用密码加密的方式以秘文方式入库，保证用户信息的安全性
用户登录，通过无状态的http session机制，通过cookie传递sessionId信息并保存登录凭证

实现用户的登录注册登出服务

点评dianpingdb数据库用户表user

/*
 Navicat Premium Data Transfer

 Source Server         : 本地测试
 Source Server Type    : MySQL
 Source Server Version : 50728
 Source Host           : localhost:3306
 Source Schema         : dianpingdb

 Target Server Type    : MySQL
 Target Server Version : 50728
 File Encoding         : 65001

 Date: 05/05/2020 12:53:23
*/

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user`  (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `created_at` datetime(0) NOT NULL,
  `updated_at` datetime(0) NOT NULL,
  `telphone` varchar(40) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '',
  `password` varchar(200) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '',
  `nick_name` varchar(40) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '',
  `gender` int(11) NOT NULL DEFAULT 0,
  PRIMARY KEY (`id`) USING BTREE,
  UNIQUE INDEX `telphone_unique_index`(`telphone`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 2 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES (1, '2020-02-01 11:46:46', '2020-05-05 11:46:56', '10987654321', '123456', '菜鸡文', 1);

SET FOREIGN_KEY_CHECKS = 1;

实现用户的登录注册服务

用户服务
用户模型
用户行为 - 登录注册
用户登录态管理

可用代码生成器mybatis-generator自动生成，生成PO类，生成mapper映射文件（其中包括基本的增删改查功能）、生成mapper接口等。要做些修改，添加下自己需要的功能或删除自己不需要的功能即可。mybatis-generator.xml

实现用户的登录注册服务

在src/main/java目录下，创建一个com.awen.dianping.service包，并在包中创建接口UserService,接口中定义一系列方法，代码如下所示。

interface UserService.java

public interface UserService {

    UserModel getUser(Integer id);

    UserModel register(UserModel registerUser) throws BusinessException, UnsupportedEncodingException, NoSuchAlgorithmException;

    UserModel login(String telphone,String password) throws UnsupportedEncodingException, NoSuchAlgorithmException, BusinessException;

    Integer countAllUser();
}

在src/main/java目录下，创建一个com.awen.dianping.dal包，并在包中创建接口UserModelMapper,接口中定义一系列方法，代码如下所示。

UserModelMapper.java

public interface UserModelMapper {
   
    int deleteByPrimaryKey(Integer id);

    int insert(UserModel record);
   
    int insertSelective(UserModel record);
    
    UserModel selectByPrimaryKey(Integer id);

    UserModel selectByTelphoneAndPassword(@Param("telphone") String telphone, @Param("password")String password);
   
    int updateByPrimaryKeySelective(UserModel record);
    
    int updateByPrimaryKey(UserModel record);

    Integer countAllUser();
}

在src/main/resources/mapping目录下，UserModelMapper.xml 代码生成就不写了，加了点添自己需要的功能，最后有源码。

在com.awen.dianping.service包下，创建UserService接口的实现类UserServiceImpl，该类需要实现接口中的所有方法，代码如下所示。

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserModelMapper userModelMapper;


    @Override
    public UserModel getUser(Integer id) {
        return userModelMapper.selectByPrimaryKey(id);
    }

    @Override
    @Transactional
    public UserModel register(UserModel registerUser) throws BusinessException, UnsupportedEncodingException, NoSuchAlgorithmException {
        registerUser.setPassword(encodeByMd5(registerUser.getPassword()));
        registerUser.setCreatedAt(new Date());
        registerUser.setUpdatedAt(new Date());

        try{
            userModelMapper.insertSelective(registerUser);
        }catch (DuplicateKeyException ex){
            throw new BusinessException(EmBusinessError.REGISTER_DUP_FAIL);
        }

        return getUser(registerUser.getId());
    }

    @Override
    public UserModel login(String telphone, String password) throws UnsupportedEncodingException, NoSuchAlgorithmException, BusinessException {
        UserModel userModel = userModelMapper.selectByTelphoneAndPassword(telphone,encodeByMd5(password));
        if(userModel == null){
            throw new BusinessException(EmBusinessError.LOGIN_FAIL);
        }
        return userModel;
    }

    @Override
    public Integer countAllUser() {
        return userModelMapper.countAllUser();
    }

    private String encodeByMd5(String str) throws NoSuchAlgorithmException, UnsupportedEncodingException {
        //确认计算方法MD5
        MessageDigest messageDigest = MessageDigest.getInstance("MD5");
        BASE64Encoder base64Encoder = new BASE64Encoder();
        return base64Encoder.encode(messageDigest.digest(str.getBytes("utf-8")));

    }
}

在com.awen.dianping.request包下，创建LoginReq,RegisterReq封装登录、注册请求数据，代码如下所示。

RegisterReq

public class RegisterReq {

    @NotBlank(message = "手机号不能为空")
    private String telphone;
    @NotBlank(message = "密码不能为空")
    private String password;
    @NotBlank(message = "昵称不能为空")
    private String nickName;

    @NotNull(message = "性别不能为空")
    private Integer gender;

    public String getTelphone() {
        return telphone;
    }

    public void setTelphone(String telphone) {
        this.telphone = telphone;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getNickName() {
        return nickName;
    }

    public void setNickName(String nickName) {
        this.nickName = nickName;
    }

    public Integer getGender() {
        return gender;
    }

    public void setGender(Integer gender) {
        this.gender = gender;
    }
}

LoginReq.java

public class LoginReq {
    @NotBlank(message = "手机号不能为空")
    private String telphone;
    @NotBlank(message = "密码不能为空")
    private String password;

    public String getTelphone() {
        return telphone;
    }

    public void setTelphone(String telphone) {
        this.telphone = telphone;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

在com.awen.dianping.controller包下，创建UserController，代码如下所示。

UserController.java

@Controller("/user")
@RequestMapping("/user")
public class UserController {

    public static final String CURRENT_USER_SESSION = "currentUserSession";

    @Autowired
    private HttpServletRequest httpServletRequest;

    @Autowired
    private UserService userService;

    //get用户信息
    @RequestMapping("/get")
    @ResponseBody
    public CommonRes getUser(@RequestParam(name="id")Integer id) throws BusinessException {
        UserModel userModel = userService.getUser(id);
        if(userModel == null){
            //return CommonRes.create(new CommonError(EmBusinessError.NO_OBJECT_FOUND),"fail");
            throw new BusinessException(EmBusinessError.NO_OBJECT_FOUND);
        }else{
            return CommonRes.create(userModel);
        }

    }

    //注册
    @RequestMapping("/register")
    @ResponseBody
    public CommonRes register(@Valid @RequestBody RegisterReq registerReq, BindingResult bindingResult) throws BusinessException, UnsupportedEncodingException, NoSuchAlgorithmException {
        if(bindingResult.hasErrors()){
            throw new BusinessException(EmBusinessError.PARAMETER_VALIDATION_ERROR, CommonUtil.processErrorString(bindingResult));
        }

        UserModel registerUser = new UserModel();
        registerUser.setTelphone(registerReq.getTelphone());
        registerUser.setPassword(registerReq.getPassword());
        registerUser.setNickName(registerReq.getNickName());
        registerUser.setGender(registerReq.getGender());

        UserModel resUserModel = userService.register(registerUser);

        return CommonRes.create(resUserModel);
    }
    //登录
    @RequestMapping("/login")
    @ResponseBody
    public CommonRes login(@RequestBody @Valid LoginReq loginReq,BindingResult bindingResult) throws BusinessException, UnsupportedEncodingException, NoSuchAlgorithmException {
        if(bindingResult.hasErrors()){
            throw new BusinessException(EmBusinessError.PARAMETER_VALIDATION_ERROR,CommonUtil.processErrorString(bindingResult));
        }
        UserModel userModel = userService.login(loginReq.getTelphone(),loginReq.getPassword());
        httpServletRequest.getSession().setAttribute(CURRENT_USER_SESSION,userModel);

        return CommonRes.create(userModel);
    }
    //注销
    @RequestMapping("/logout")
    @ResponseBody
    public CommonRes logout() throws BusinessException, UnsupportedEncodingException, NoSuchAlgorithmException {
        httpServletRequest.getSession().invalidate();
        return CommonRes.create(null);
    }

    //获取当前用户信息
    @RequestMapping("/getcurrentuser")
    @ResponseBody
    public CommonRes getCurrentUser(){
        UserModel userModel = (UserModel) httpServletRequest.getSession().getAttribute(CURRENT_USER_SESSION);
        return CommonRes.create(userModel);
    }
}