电商项目（二十五）用户模块开发（登录功能开发）

向右看齐 2021-09-26 14:18 303阅读 0赞

**用户模块功能如下：  
![这里写图片描述][70]  
![这里写图片描述][70 1]  
![这里写图片描述][70 2]**

# 一、门户登陆功能 #

## 1、门户接口设计 ##

//请求参数：
    username,password
    //响应：
    fail
    { 
        "status": 1,
        "msg": "密码错误"
    }
    
    success
    { 
        "status": 0,
        "data": { 
            "id": 12,
            "username": "aaa",
            "email": "aaa@163.com",
            "phone": null,
            "role": 0,
            "createTime": 1479048325000,
            "updateTime": 1479048325000
        }
    }

## 2、复合响应对象 ##

//保证序列化json的时候,如果是null的对象,key也会消失
    /* 这里加这个的原因是： 当登陆失败的话返回的是{ status : 1 msg : 密码错误 而data是一个有key的空节点,即value = null } 这样的话data将不会出现在json之中了。 */
    @JsonSerialize(include =  JsonSerialize.Inclusion.NON_NULL)
    public class ServerResponse<T> implements Serializable { 
    
        private int status;   //状态
        private String msg;   //信息
        private T data;
    
        //定义4个构造方法
        //1
        private ServerResponse(int status) { 
            this.status = status;
        }
    
        //2
        private ServerResponse(int status,T data){ 
            this.status = status;
            this.data = data;
        }
    
        //3
        private ServerResponse(int status,String msg,T data){ 
            this.status = status;
            this.msg = msg;
            this.data = data;
        }
    
        //4
        private ServerResponse(int status,String msg){ 
            this.status = status;
            this.msg = msg;
        }
    
        @JsonIgnore
        //使之不在json序列化结果当中
        //即json里面不会出现这个
        public boolean isSuccess(){ 
            //如果status == 0 则返回true
            //SUCCESS的枚举值为0
            return this.status == ResponseCode.SUCCESS.getCode();
        }
        //返回状态
        public int getStatus(){ 
            return status;
        }
        public T getData(){ 
            return data;
        }
        public String getMsg(){ 
            return msg;
        }
        //调用status构造器
        public static <T> ServerResponse<T> createBySuccess(){ 
            return new ServerResponse<T>(ResponseCode.SUCCESS.getCode());
        }
        //调用4号构造器
        public static <T> ServerResponse<T> createBySuccessMessage(String msg){ 
            return new ServerResponse<T>(ResponseCode.SUCCESS.getCode(),msg);
        }
    
        public static <T> ServerResponse<T> createBySuccess(T data){ 
            return new ServerResponse<T>(ResponseCode.SUCCESS.getCode(),data);
        }
    
        public static <T> ServerResponse<T> createBySuccess(String msg,T data){ 
            return new ServerResponse<T>(ResponseCode.SUCCESS.getCode(),msg,data);
        }
    
        public static <T> ServerResponse<T> createByError(){ 
            return new ServerResponse<T>(ResponseCode.ERROR.getCode(),ResponseCode.ERROR.getDesc());
        }
    
    
        public static <T> ServerResponse<T> createByErrorMessage(String errorMessage){ 
            return new ServerResponse<T>(ResponseCode.ERROR.getCode(),errorMessage);
        }
    
        public static <T> ServerResponse<T> createByErrorCodeMessage(int errorCode,String errorMessage){ 
            return new ServerResponse<T>(errorCode,errorMessage);
        }
    }

## 3、ResponseCode ##

public enum ResponseCode { 
        SUCCESS(0,"SUCCESS"),
        ERROR(1,"ERROR"),
        NEED_LOGIN(10,"NEED_LOGIN"),
        ILLEGAL_ARGUMENT(2,"ILLEGAL_ARGUMENT");
    
        //成员变量（常量）
        private final int code;
        private final String desc;
    
        //构造方法
        ResponseCode(int code,String desc){ 
            this.code = code;
            this.desc = desc;
        }
        //普通函数
        public int getCode(){ 
            return code;
        }
        public String getDesc(){ 
            return desc;
        }
    
        public static void main(String args[]){ 
            System.out.println(ResponseCode.SUCCESS.getDesc());
            System.out.println(ResponseCode.SUCCESS.getCode());
        }
    }

## 4、Controller层 ##

@Controller                   //WEB层(用于标注类本身的用途)
    @RequestMapping("/user/")     //将请求地址的前面加上/user
    public class UserController { 
    	//按类型进行注入
        //将iUserService注入进来
        @Autowired
        private IUserService iUserService;
    
        //登陆功能
        //访问地址为login.do 访问方式为POST
        @RequestMapping(value = "login.do",method = RequestMethod.POST)
        @ResponseBody         //自动通过SpingMvc的json插件将返回值转换成json
        public ServerResponse<User> login(String username, String password, HttpSession session) { 
            ServerResponse<User> response = iUserService.login(username, password);
            //如果登陆成功，将用户放入到Session中
            if (response.isSuccess()) { 
                session.setAttribute(Const.CURRENT_USER, response.getData());
            }
            //将响应信息返回到前端
            return response;
        }
    }

## 5、Service接口 ##

//定义IUserService接口
    public interface IUserService { 
    	//登陆
        ServerResponse<User> login(String username, String password);
     }

## 6、Service接口实现类 ##

//Service表示业务层
    //创建iUserService对象，放入到容器中
    @Service("iUserService")
    public class UserServiceImpl implements IUserService { 
        //注入userMapper
        @Autowired
        private UserMapper userMapper;
        //登陆
        @Override
        public ServerResponse<User> login(String username, String password) { 
            //先查询用户名，看用户名是否存在
            int resultCount = userMapper.checkUsername(username);
            //如果查不到的话，用户不存在
            if (resultCount == 0) { 
                return ServerResponse.createByErrorMessage("用户名不存在");
            }
            //密码登陆
            String md5Password = MD5Util.MD5EncodeUtf8(password);
            //通过用户名和密码进行查询
            User user = userMapper.selectLogin(username, md5Password);
            if (user == null) { 
                return ServerResponse.createByErrorMessage("密码错误");
            }
            //将密码设置为空
            user.setPassword(org.apache.commons.lang3.StringUtils.EMPTY);
            return ServerResponse.createBySuccess("登录成功", user);
        }
     }

## 7、Mapper接口 ##

public interface UserMapper { 
    	//查询用户名，看此用户名是否存在
        int checkUsername(String username);
        //用户登陆
        //@Param为传入的参数起名字，这样在Dao层可以获得数据
    	User selectLogin(@Param("username") String username, @Param("password")String password);
    }

## 8、Mapper.xml ##

<sql id="Base_Column_List" >
           id, username, password, email, phone, question, answer, role, create_time, update_time
    </sql>
    
    <select id="checkUsername" resultType="int" parameterType="string" >
        select count(1) from mmall_user where username = #{username}
    </select>
    
    <select id="selectLogin" resultMap="BaseResultMap" parameterType="map">
          SELECT
          --     *???//这样真的好么?答案就是,这样不好.
          <include refid="Base_Column_List" />   
          from mmall_user
          where username = #{username}
          and password = #{password}
    </select>

## 9、测试 ##

![这里写图片描述][70 3]  
响应：  
![这里写图片描述][70 4]

> **转载请标明出处，原文地址：https://blog.csdn.net/weixin\_41835916  
> 如果觉得本文对您有帮助，请点击顶支持一下，您的支持是我写作最大的动力，谢谢。  
> ![这里写图片描述][70 5]**

[70]: /images/20210923/7e9d13e132d4480295c3e8fd3f6d630d.png
[70 1]: /images/20210923/3657da15c4144df1a00974e0e89454d0.png
[70 2]: /images/20210923/7eb93ac60b9047a980e8d4913d6f6cdf.png
[70 3]: /images/20210923/85b909cf4d634e0587f69f1dcd08b23d.png
[70 4]: /images/20210923/384a916ea4674317a5ca90987f2ebafe.png
[70 5]: /images/20210923/3d9863f0b8614a9aa9bf21b6ad97177d.png