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:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="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">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.1</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.wulaoda</groupId>
    <artifactId>loginhouduan</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>loginhouduan</name>
    <description>loginhouduan</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <!--        web-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--测试-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!--        链接池-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.0</version>
        </dependency>
        <!--        mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.11</version>
        </dependency>
        <!--        mybatis-plus-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.1.0</version>
        </dependency>
        <!--        实体字段校验-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

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<SysUserEntity> {
}

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<T> {

    //    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<T> {

    //    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<SysUserMapper, SysUserEntity> 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<SysUserEntity> wrapper = new QueryWrapper<>();
        wrapper.lambda().eq(SysUserEntity::getLoginName,loginName);
        List<SysUserEntity> 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> T copy(Object source, Class<T> 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 <T> List<T> copyList(List source, Class<T> clazz) {
        List<T> 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

原文地址：http://www.cnblogs.com/FatTiger4399/p/16919552.html

1. 本站所有资源来源于用户上传和网络，如有侵权请邮件联系站长！ 2. 分享目的仅供大家学习和交流，请务用于商业用途! 3. 如果你也有好源码或者教程，可以到用户中心发布，分享有积分奖励和额外收入！ 4. 本站提供的源码、模板、插件等等其他资源，都不包含技术服务请大家谅解！ 5. 如有链接无法下载、失效或广告，请联系管理员处理！ 6. 本站资源售价只是赞助，收取费用仅维持本站的日常运营所需！ 7. 如遇到加密压缩包，默认解压密码为"gltf",如遇到无法解压的请联系管理员！ 8. 因为资源和程序源码均为可复制品，所以不支持任何理由的退款兑现，请斟酌后支付下载声明：如果标题没有注明"已测试"或者"测试可用"等字样的资源源码均未经过站长测试.特别注意没有标注的源码不保证任何可用性

我的第一个项目(三)：注册登陆功能(后端)

1.首先,我们在pom.xml文件中导入第三方包:

2.然后我们配置数据库的连接参数:

3.定义实体类entity:

4.controller类:

5.mapper类:

6.req请求类:

7.resp类:

8.service类

9.utils类

10.Git仓库拿代码:

排行榜展示

3D打印机glb模型下载-机械glb模型

树glb模型下载-树2

水稻glb模型下载-水稻1

变电箱1glb模型下载-机械glb模型

树glb模型下载-树3

模型

水稻glb模型下载-水稻1

树glb模型下载-树3

树glb模型下载-树2

3D打印机glb模型下载-机械glb模型

变电箱1glb模型下载-机械glb模型

树glb模型下载-树1

我的第一个项目(三)：注册登陆功能(后端)

1.首先,我们在pom.xml文件中导入第三方包:

2.然后我们配置数据库的连接参数:

3.定义实体类entity:

4.controller类:

5.mapper类:

6.req请求类:

7.resp类:

8.service类

9.utils类

10.Git仓库拿代码:

排行榜展示

标签

模型