我的第一个项目(三)：注册登陆功能(后端)

好家伙,前端出了点bug

 

我们来搞定后端先: 

后端我们用的框架是Spring boot 

数据库:MySQl

代码已开源,连接在最后

 

新建项目:

 

 

只点Java Web

 

项目目录如下：

 

 

 

 

1.首先,我们在pom.xml文件中导入第三方包:

web服务,mysql连接驱动等一系列包

 

pom.xml文件:

"1.0" encoding="UTF-8"?>
"http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
        2.7.1
         
    
    com.wulaoda
    loginhouduan
    0.0.1-SNAPSHOT
    loginhouduan
    loginhouduan
    
        1.8
    
    
        
        
            org.springframework.boot
            spring-boot-starter-web
        
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
        
        
            com.alibaba
            druid
            1.1.0
        
        
        
            mysql
            mysql-connector-java
            8.0.11
        
        
        
            com.baomidou
            mybatis-plus-boot-starter
            3.1.0
        
        
        
            org.springframework.boot
            spring-boot-starter-validation
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

 

 

2.然后我们配置数据库的连接参数:

application.yml文件：

server:
  port: 3312
spring:
  datasource:
    url: jdbc:mysql://localhost:3306/cruddemo?characterEncoding=utf8&useUnicode=true&useSSL=false&serverTimezone=UTC
    username: root
    password: root
    driver-class-name: com.mysql.cj.jdbc.Driver

 

3.定义实体类entity:

SysUserController.java

定义数据类型

并为其创建相应的getter和setter方法:

 

 

 

 

 

 

 

 

 然后就是这样:

package com.wulaoda.loginhouduan.entity;

import com.baomidou.mybatisplus.annotation.TableName;

@TableName("sys_user")
public class SysUserEntity {
    private Long id;

    private String LoginName;

    private String name;

    private String password;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getLoginName() {
        return LoginName;
    }

    public void setLoginName(String loginName) {
        LoginName = loginName;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPassword() {
        return password;
    }

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

    @Override
    public String toString() {
        return "SysUserEntity{" +
                "id=" + id +
                ", LoginName='" + LoginName + '\'' +
                ", name='" + name + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

 

4.controller类:

 SysUserController.java文件:

package com.wulaoda.loginhouduan.controller;


import com.wulaoda.loginhouduan.req.SysUserLoginReq;
import com.wulaoda.loginhouduan.req.SysUserSaveReq;
import com.wulaoda.loginhouduan.resp.CommonResp;
import com.wulaoda.loginhouduan.resp.SysUserLoginResp;
import com.wulaoda.loginhouduan.service.SysUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.DigestUtils;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
//绑定数据库表名
@RequestMapping("/sys-user")
public class SysUserController {

    @Autowired
    private SysUserService sysUserService;

    @PostMapping("register")
//    zxcv1234
    public CommonResp register(@RequestBody  SysUserSaveReq req){
        req.setPassword(DigestUtils.md5DigestAsHex(req.getPassword().getBytes()));
        CommonResp resp = new CommonResp<>();
        sysUserService.register(req);
        return resp;
    }

    @PostMapping("login")
    public CommonResp login(@RequestBody SysUserLoginReq req){
//        zxcv1234
        req.setPassword(DigestUtils.md5DigestAsHex(req.getPassword().getBytes()));
        CommonResp resp = new CommonResp<>();
        SysUserLoginResp loginResp = sysUserService.login(req);
        resp.setContent(loginResp);
        return resp;
    }

}

 

 

5.mapper类:

SysUserMapper.java文件:

package com.wulaoda.loginhouduan.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.wulaoda.loginhouduan.entity.SysUserEntity;
import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface SysUserMapper extends BaseMapper {
}

 

 

6.req请求类:

SysUserLoginReq.java文件:

package com.wulaoda.loginhouduan.req;

public class SysUserLoginReq {


    private String LoginName;


    private String password;



    public String getLoginName() {
        return LoginName;
    }

    public void setLoginName(String loginName) {
        LoginName = loginName;
    }


    public String getPassword() {
        return password;
    }

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

    @Override
    public String toString() {
        return "SysUserEntity{" +
                ", LoginName='" + LoginName + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

 

SysUserSaveReq.java文件:

package com.wulaoda.loginhouduan.req;

import com.baomidou.mybatisplus.annotation.TableName;

public class SysUserSaveReq {
    private Long id;

    private String LoginName;

    private String name;

    private String password;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getLoginName() {
        return LoginName;
    }

    public void setLoginName(String loginName) {
        LoginName = loginName;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPassword() {
        return password;
    }

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

    @Override
    public String toString() {
        return "SysUserEntity{" +
                "id=" + id +
                ", LoginName='" + LoginName + '\'' +
                ", name='" + name + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

 

7.resp类:

CommonResp.java文件:

package com.wulaoda.loginhouduan.resp;

public class CommonResp {

    //    业务上的成功与失败
    private Boolean success = true;

    //    返回信息
    private String message;

    //返回范型数据 自定义类型
    private T content;

    public Boolean getSuccess() {
        return success;
    }

    public void setSuccess(Boolean success) {
        this.success = success;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public T getContent() {
        return content;
    }

    public void setContent(T content) {
        this.content = content;
    }

    @Override
    public String toString() {
        return "CommonResp{" +
                "success=" + success +
                ", message='" + message + '\'' +
                ", content=" + content +
                '}';
    }
}

 

SysUserLoginResp

package com.wulaoda.loginhouduan.resp;

public class CommonResp {

    //    业务上的成功与失败
    private Boolean success = true;

    //    返回信息
    private String message;

    //返回范型数据 自定义类型
    private T content;

    public Boolean getSuccess() {
        return success;
    }

    public void setSuccess(Boolean success) {
        this.success = success;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public T getContent() {
        return content;
    }

    public void setContent(T content) {
        this.content = content;
    }

    @Override
    public String toString() {
        return "CommonResp{" +
                "success=" + success +
                ", message='" + message + '\'' +
                ", content=" + content +
                '}';
    }
}

 

 

8.service类

 

 

 impl/SysUserServicelmpl.java文件:

package com.wulaoda.loginhouduan.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.wulaoda.loginhouduan.entity.SysUserEntity;
import com.wulaoda.loginhouduan.mapper.SysUserMapper;
import com.wulaoda.loginhouduan.req.SysUserLoginReq;
import com.wulaoda.loginhouduan.req.SysUserSaveReq;
import com.wulaoda.loginhouduan.resp.SysUserLoginResp;
import com.wulaoda.loginhouduan.service.SysUserService;
import com.wulaoda.loginhouduan.utils.CopyUtil;
import com.wulaoda.loginhouduan.utils.SnowFlake;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;
import org.springframework.util.ObjectUtils;

import javax.annotation.Resource;
import java.util.List;

@Service
public class SysUserServiceImpl extends ServiceImpl implements SysUserService {

    @Resource
    private SysUserMapper sysUserMapper;

    @Autowired
    private SnowFlake snowFlake;


    @Override
    public void register(SysUserSaveReq req) {
        SysUserEntity user = CopyUtil.copy(req, SysUserEntity.class);
        if(ObjectUtils.isEmpty(req.getId())){
            SysUserEntity userDb = selectByLoginName(req.getLoginName());
            if(ObjectUtils.isEmpty(userDb)){
                user.setId(snowFlake.nextId());
                sysUserMapper.insert(user);
            }
        }
    }

    @Override
    public SysUserLoginResp login(SysUserLoginReq req) {
        SysUserEntity userDb = selectByLoginName(req.getLoginName());
        if(ObjectUtils.isEmpty(userDb)){
            //用户不存在
            return null;
        }else {
            //登陆成功
            SysUserLoginResp userLoginResp = CopyUtil.copy(userDb, SysUserLoginResp.class);
            return userLoginResp;
        }
    }

    //查询loginName是否被注册
    public SysUserEntity selectByLoginName(String loginName){
        QueryWrapper wrapper = new QueryWrapper<>();
        wrapper.lambda().eq(SysUserEntity::getLoginName,loginName);
        List userEntityList = sysUserMapper.selectList(wrapper);
        if(CollectionUtils.isEmpty(userEntityList)){
            return  null;
        }else {
            return userEntityList.get(0);
        }
    }
}

 

SysUserService.java文件:

package com.wulaoda.loginhouduan.service;

import com.wulaoda.loginhouduan.req.SysUserLoginReq;
import com.wulaoda.loginhouduan.req.SysUserSaveReq;
import com.wulaoda.loginhouduan.resp.SysUserLoginResp;

public interface SysUserService {
    void register(SysUserSaveReq req);

    SysUserLoginResp login(SysUserLoginReq req);
}

 

 

9.utils类

算法优化部分:

CopyUtil.java文件:

package com.wulaoda.loginhouduan.utils;

import org.springframework.beans.BeanUtils;
import org.springframework.util.CollectionUtils;

import java.util.ArrayList;
import java.util.List;

public class CopyUtil {

    /**
     * 单体复制
     */
    public static  T copy(Object source, Class clazz) {
        if (source == null) {
            return null;
        }
        T obj = null;
        try {
            obj = clazz.newInstance();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
        BeanUtils.copyProperties(source, obj);
        return obj;
    }

    /**
     * 列表复制
     */
    public static  List copyList(List source, Class clazz) {
        List target = new ArrayList<>();
        if (!CollectionUtils.isEmpty(source)){
            for (Object c: source) {
                T obj = copy(c, clazz);
                target.add(obj);
            }
        }
        return target;
    }
}

 

SnowFlake.java文件:

package com.wulaoda.loginhouduan.utils;

import org.springframework.stereotype.Component;

import java.text.ParseException;

/**
 * Twitter的分布式自增ID雪花算法
 **/
@Component
public class SnowFlake {

    /**
     * 起始的时间戳
     */
    private final static long START_STMP = 1609459200000L; // 2021-01-01 00:00:00

    /**
     * 每一部分占用的位数
     */
    private final static long SEQUENCE_BIT = 12; //序列号占用的位数
    private final static long MACHINE_BIT = 5;   //机器标识占用的位数
    private final static long DATACENTER_BIT = 5;//数据中心占用的位数

    /**
     * 每一部分的最大值
     */
    private final static long MAX_DATACENTER_NUM = -1L ^ (-1L << DATACENTER_BIT);
    private final static long MAX_MACHINE_NUM = -1L ^ (-1L << MACHINE_BIT);
    private final static long MAX_SEQUENCE = -1L ^ (-1L << SEQUENCE_BIT);

    /**
     * 每一部分向左的位移
     */
    private final static long MACHINE_LEFT = SEQUENCE_BIT;
    private final static long DATACENTER_LEFT = SEQUENCE_BIT + MACHINE_BIT;
    private final static long TIMESTMP_LEFT = DATACENTER_LEFT + DATACENTER_BIT;

    private long datacenterId = 1;  //数据中心
    private long machineId = 1;     //机器标识
    private long sequence = 0L; //序列号
    private long lastStmp = -1L;//上一次时间戳

    public SnowFlake() {
    }

    public SnowFlake(long datacenterId, long machineId) {
        if (datacenterId > MAX_DATACENTER_NUM || datacenterId < 0) {
            throw new IllegalArgumentException("datacenterId can't be greater than MAX_DATACENTER_NUM or less than 0");
        }
        if (machineId > MAX_MACHINE_NUM || machineId < 0) {
            throw new IllegalArgumentException("machineId can't be greater than MAX_MACHINE_NUM or less than 0");
        }
        this.datacenterId = datacenterId;
        this.machineId = machineId;
    }

    /**
     * 产生下一个ID
     *
     * @return
     */
    public synchronized long nextId() {
        long currStmp = getNewstmp();
        if (currStmp < lastStmp) {
            throw new RuntimeException("Clock moved backwards.  Refusing to generate id");
        }

        if (currStmp == lastStmp) {
            //相同毫秒内，序列号自增
            sequence = (sequence + 1) & MAX_SEQUENCE;
            //同一毫秒的序列数已经达到最大
            if (sequence == 0L) {
                currStmp = getNextMill();
            }
        } else {
            //不同毫秒内，序列号置为0
            sequence = 0L;
        }

        lastStmp = currStmp;

        return (currStmp - START_STMP) << TIMESTMP_LEFT //时间戳部分
                | datacenterId << DATACENTER_LEFT       //数据中心部分
                | machineId << MACHINE_LEFT             //机器标识部分
                | sequence;                             //序列号部分
    }

    private long getNextMill() {
        long mill = getNewstmp();
        while (mill <= lastStmp) {
            mill = getNewstmp();
        }
        return mill;
    }

    private long getNewstmp() {
        return System.currentTimeMillis();
    }

    public static void main(String[] args) throws ParseException {
        // 时间戳
        // System.out.println(System.currentTimeMillis());
        // System.out.println(new Date().getTime());
        //
        // String dateTime = "2021-01-01 08:00:00";
        // SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
        // System.out.println(sdf.parse(dateTime).getTime());

        SnowFlake snowFlake = new SnowFlake(1, 1);

        long start = System.currentTimeMillis();
        for (int i = 0; i < 10; i++) {
            System.out.println(snowFlake.nextId());
            System.out.println(System.currentTimeMillis() - start);
        }
    }
}

 

10.Git仓库拿代码:

已开源,前端暂时未写好,后端接口部分后面还要再改

https://gitee.com/tang-and-han-dynasties/login-entity.git