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秒杀系统1-登录功能

2022-07-03 15:18:00 【ジ你是我永远のbugグ】

学习目标
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技术点
在这里插入图片描述
这里主要是秒杀业务，没有做前后端分离

如何设计一个秒杀系统

1、秒杀系统解决两个问题

  1. 并发读
  2. 并发写

2、秒杀系统的技术要求：

  1. 高性能
    秒杀涉及大量的并发读和并发写，因此支持高并发访问很重要，解决方案：动静分离、热点的发现与隔离、请求的削峰与分层过滤、服务端的极致优化。
  2. 一致性
    有限的商品被大量的请求 ，拍下减库存、付款减库存、预扣等几种扣库存的方式，在大并发下保证数据的准确性。
  3. 高可用
    避免出现考虑不到的情况，还有设计个planB方案，保证系统的高可用和正确性。

spring boot (java8)环境搭建

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技术架构：springboot + mybatis-plus + mysql + thymeleaf
1、pom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>2.7.0</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>seckill</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>seckill</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.1</version>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

2、application.yaml 配置文件
其中：使用 springboot默认的数据连接线程池：hikari(嘿卡瑞)，号称最快的线程池

spring:
  # thymeleaf关闭缓存
  thymeleaf:
    cache: false

  # MySql数据源配置
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/secKill?useUnicode=true&characterEncoding=utf-8&useSSL=false
    username: root
    password: 123456

    # 最快的连接池
    hikari:
      # 连接池的名称
      pool-name: DateHikariCP
      # 最小空闲连接数
      minimum-idle: 5
      # 空闲连接存活最大时间 默认600000(10分钟)
      idle-timeout: 1800000
      # 最大连接数 默认10
      maximum-pool-size: 10
      # 从连接池返回的连接自动提交
      auto-commit: true
      # 连接最大存活时间  0代表永久存活，默认 1800000(分钟)
      max-lifetime: 1800000
      # 连接超时时间 默认30000(30秒)
      connection-timeout: 30000
      # 测试连接是否可以的查询语句
      connection-test-query: SELECT 1

# mybatis-plus 配置
mybatis-plus:
  # 配置 Mapper.xml的映射文件路径
  mapper-locations: classpath*:/mapper/*.xml # mybatis SQL 打印(接口方法在的包，不是 mapper.xml所在的包) logging: level: com.example.seckill.mapper: DEBUG

3、在启动类加上mapper包扫描
@MapperScan(“com.example.seckill.mapper”)

好了 写个测试请求 看看项目有木有问题
controller

package com.example.seckill.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@RequestMapping("/my")
public class TestDemo {
    

    @RequestMapping("/hello")
    public String hello(Model model) {
    
        model.addAttribute("name","lishuang");
        return "hello";
    }
}

thymeleaf

<!doctype html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>测试</title>
</head>
<body>

<p th:text="'hello:'+${name}"></p>
</body>
</html>

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ok了

数据库的表信息

CREATE TABLE t_user(
	`id` BIGINT(20) NOT NULL COMMENT '用户ID,手机号码',
	`nickname` VARCHAR(255) not NULL,
	`password` VARCHAR(32) DEFAULT NULL COMMENT 'MD5(MD5(pass明文+固定salt)+salt)',
	`salt` VARCHAR(10) DEFAULT NULL,
	`head` VARCHAR(128) DEFAULT NULL COMMENT '头像',
	`register_date` datetime DEFAULT NULL COMMENT '注册时间',
	`last_login_date` datetime DEFAULT NULL COMMENT '最后一次登录事件',
	`login_count` int(11) DEFAULT '0' COMMENT '登录次数',
	PRIMARY KEY(`id`)
)
COMMENT '用户表';

CREATE TABLE t_goods(
	id BIGINT(20) not NULL AuTO_increment COMMENT '商品ID',
	goods_name VARCHAR(16) DEFAULT NULL COMMENT '商品名称',
	goods_title VARCHAR(64) DEFAULT NULL COMMENT '商品标题',
	goods_img VARCHAR(64) DEFAULT NULL COMMENT '商品图片',
	goods_detail LONGTEXT COMMENT '商品详情',
	goods_price DECIMAL(10,2) DEFAULT '0.00' COMMENT '商品价格',
	goods_stock INT(11) DEFAULT '0' COMMENT '商品库存，-1表示没有限制',
	PRIMARY KEY(id)
)
COMMENT '商品表';

CREATE TABLE `t_order` (
	`id` BIGINT(20) NOT NULL  AUTO_INCREMENT COMMENT '订单ID',
	`user_id` BIGINT(20) DEFAULT NULL COMMENT '用户ID',
	`goods_id` BIGINT(20) DEFAULT NULL COMMENT '商品ID',
	`delivery_addr_id` BIGINT(20) DEFAULT NULL  COMMENT '收获地址ID',
	`goods_name` VARCHAR(16) DEFAULT NULL  COMMENT '商品名字',
	`goods_count` INT(20) DEFAULT '0'  COMMENT '商品数量',
	`goods_price` DECIMAL(10,2) DEFAULT '0.00'  COMMENT '商品价格',
	`order_channel` TINYINT(4) DEFAULT '0'  COMMENT '1 pc,2 android, 3 ios',
	`status` TINYINT(4) DEFAULT '0'  COMMENT '订单状态，0新建未支付，1已支付，2已发货，3已收货，4已退货，5已完成',
	`create_date` datetime DEFAULT NULL  COMMENT '订单创建时间',
	`pay_date` datetime DEFAULT NULL  COMMENT '支付时间',
	PRIMARY KEY(`id`)
)ENGINE = INNODB AUTO_INCREMENT=12 DEFAULT CHARSET = utf8mb4;
COMMENT '订单表'
;

CREATE TABLE `t_seckill_goods`(
	`id` BIGINT(20) NOT NULL AUTO_INCREMENT COMMENT '秒杀商品ID',
	`goods_id` BIGINT(20) NOT NULL COMMENT '商品ID',
	`seckill_price` DECIMAL(10,2) NOT NULL COMMENT '秒杀家',
	`stock_count` INT(10) NOT NULL  COMMENT '库存数量',
	`start_date` datetime NOT NULL  COMMENT '秒杀开始时间',
	`end_date` datetime NOT NULL COMMENT '秒杀结束时间',
	PRIMARY KEY(`id`)
)ENGINE = INNODB AUTO_INCREMENT=3 DEFAULT CHARSET = utf8mb4
COMMENT '秒杀商品表'
;

CREATE TABLE `t_seckill_order` (
	`id` BIGINT(20) NOT NULL AUTO_INCREMENT COMMENT '秒杀订单ID',
	`user_id` BIGINT(20) NOT NULL  COMMENT '用户ID',
	`order_id` BIGINT(20) NOT NULL  COMMENT '订单ID',
	`goods_id` BIGINT(20) NOT NULL  COMMENT '商品ID',
	PRIMARY KEY(`id`)
)ENGINE = INNODB AUTO_INCREMENT=3 DEFAULT CHARSET = utf8mb4
COMMENT '秒杀订单表'
;

-- 添加索引，讲到时在加
ALTER TABLE `seckill`.`t_seckill_order` 
ADD UNIQUE INDEX `seckill_uid_gid`(user_id, goods_id) USING BTREE COMMENT '用户ID+商品ID成为唯一索引，';

客户端：PW=MD5(明文+固定Salt)
服务端：PW=MD5(用户输入+随机Salt)

用户端MD5加密是为了防止用户密码在网络中明文传输，服务端MD5加密是为了提高密码安全性，双
重保险

实现登录功能

因为这里用到了 MD5 就需要添加下MD5的相关依赖

<!-- md5 依赖 -->
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.6</version>
</dependency>

1、MD5工具类

对密码进行 两次加密 + 盐 此处密码部分可忽略，简单来说就是对密码进行加密 保证安全性，有点复杂，了解即可，不关键。

package com.example.seckill.util;

import org.apache.commons.codec.digest.DigestUtils;
import org.springframework.stereotype.Component;

/** * MD5工具类 */
@Component
public class MD5Util {
    

    // 加密使用的 --盐
    // 这个salt 和前端的盐进行统一
    private static final String salt = "1a2b3c4d";

    /** * MD5加密 * @param src * @return */
    public static String md5(String src) {
    
        return DigestUtils.md5Hex(src);
    }

    // 第一次加密
    public static String inputPassToFromPass(String inputPass) {
    
        String str = salt.charAt(0) + salt.charAt(2) + inputPass + salt.charAt(5) + salt.charAt(4);
        return md5(str);
    }

    //

    /** * 第二次加密：后端的密码到数据库的密码 * * @param formPass 后端接收的密码 * @param salt 存进数据库的 盐 * @return */
    public static String formPassToDBPass(String formPass, String salt) {
    
        String str = salt.charAt(0) + salt.charAt(2) + formPass + salt.charAt(5) + salt.charAt(4);
        return md5(str);
    }


    /** * 这个是我们后端真正会调用的密码 * @param inputPass * @param salt * @return */
    public static String inputPassToDBPass(String inputPass, String salt) {
    
        String fromPass = inputPassToFromPass(inputPass);
        String dbPass = formPassToDBPass(fromPass, salt);
        return dbPass;
    }



}

2、mybatis 的逆向工程

逆向工程

3、请求的返回

响应枚举类

package com.example.seckill.common;

/** * 公共返回对象枚举 * * @author: LC * @date 2022/3/2 1:44 下午 * @ClassName: RespBean */

public enum RespBeanEnum {
    

    //通用
    SUCCESS(200, "SUCCESS"),
    ERROR(500, "服务端异常"),

    //登录模块
    LOGIN_ERROR(500210, "用户名或者密码不正确"),
    MOBILE_ERROR(500211, "手机号码格式不正确"),
    BIND_ERROR(500212, "参数校验异常"),
    MOBILE_NOT_EXIST(500213, "手机号码不存在"),
    PASSWORD_UPDATE_FAIL(500214, "更新密码失败"),
    SESSION_ERROR(500215, "用户SESSION不存在"),


    //秒杀模块
    EMPTY_STOCK(500500, "库存不足"),
    REPEATE_ERROR(500501, "该商品每人限购一件"),
    REQUEST_ILLEGAL(500502, "请求非法，请重新尝试"),
    ERROR_CAPTCHA(500503, "验证码错误，请重新输入"),
    ACCESS_LIMIT_REACHED(500504, "访问过于频繁，请稍后重试"),
    //订单模块5003xx
    ORDER_NOT_EXIST(500300, "订单不存在"),


    ;

    private final Integer code;
    private final String message;

    public Integer getCode() {
    
        return code;
    }

    public String getMessage() {
    
        return message;
    }

    RespBeanEnum(Integer code, String message) {
    
        this.code = code;
        this.message = message;
    }
}

响应信息

package com.example.seckill.common;

/** * 公共返回对象 * * @author: LC * @date 2022/3/2 1:50 下午 * @ClassName: RespBean */
public class RespBean {
    

    private long code;
    private String message;
    private Object object;

    public static RespBean success() {
    
        return new RespBean(RespBeanEnum.SUCCESS.getCode(), RespBeanEnum.SUCCESS.getMessage(), null);
    }

    public static RespBean success(Object object) {
    
        return new RespBean(RespBeanEnum.SUCCESS.getCode(), RespBeanEnum.SUCCESS.getMessage(), object);
    }

    public static RespBean error(RespBeanEnum respBeanEnum) {
    
        return new RespBean(respBeanEnum.getCode(), respBeanEnum.getMessage(), null);
    }

    public static RespBean error(RespBeanEnum respBeanEnum, Object object) {
    
        return new RespBean(respBeanEnum.getCode(), respBeanEnum.getMessage(), object);
    }

    public RespBean(long code, String message, Object object) {
    
        this.code = code;
        this.message = message;
        this.object = object;
    }

    public RespBean() {
    

    }

    public long getCode() {
    
        return code;
    }

    public void setCode(long code) {
    
        this.code = code;
    }

    public String getMessage() {
    
        return message;
    }

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

    public Object getObject() {
    
        return object;
    }

    public void setObject(Object object) {
    
        this.object = object;
    }
}

3、跳转登录页面

@RequestMapping("/login")
@Controller
@Slf4j
public class LoginController {
    

    @RequestMapping ("toLogin")
    public String toLogin(){
    
        return "login";
    }


// @PostMapping("/doLogin")
// public String doLogin(){
    
//
// }
}

登录页面与 登录的功能实现

<!DOCTYPE html>
<html lang="en"
      xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>登录</title>
    <!-- jquery -->
    <script type="text/javascript" th:src="@{/js/jquery.min.js}"></script>
    <!-- bootstrap -->
    <link rel="stylesheet" type="text/css" th:href="@{/bootstrap/css/bootstrap.min.css}"/>
    <script type="text/javascript" th:src="@{/bootstrap/js/bootstrap.min.js}"></script>
    <!-- jquery-validator -->
    <script type="text/javascript" th:src="@{/jquery-validation/jquery.validate.min.js}"></script>
    <script type="text/javascript" th:src="@{/jquery-validation/localization/messages_zh.min.js}"></script>
    <!-- layer -->
    <script type="text/javascript" th:src="@{/layer/layer.js}"></script>
    <!-- md5.js -->
    <script type="text/javascript" th:src="@{/js/md5.min.js}"></script>
    <!-- common.js -->
    <script type="text/javascript" th:src="@{/js/common.js}"></script>
</head>
<body>
<form name="loginForm" id="loginForm" method="post" style="width:50%; margin:0 auto">

    <h2 style="text-align:center; margin-bottom: 20px">用户登录</h2>

    <div class="form-group">
        <div class="row">
            <label class="form-label col-md-4">请输入手机号码</label>
            <div class="col-md-5">
                <input id="mobile" name="mobile" class="form-control" type="text" placeholder="手机号码" required="true"
                />
                <!--             取消位数限制          minlength="11" maxlength="11"-->
            </div>
            <div class="col-md-1">
            </div>
        </div>
    </div>

    <div class="form-group">
        <div class="row">
            <label class="form-label col-md-4">请输入密码</label>
            <div class="col-md-5">
                <input id="password" name="password" class="form-control" type="password" placeholder="密码"
                       required="true"
                />
                <!--             取消位数限制            minlength="6" maxlength="16"-->
            </div>
        </div>
    </div>

    <div class="row">
        <div class="col-md-5">
            <button class="btn btn-primary btn-block" type="reset" onclick="reset()">重置</button>
        </div>
        <div class="col-md-5">
            <button class="btn btn-primary btn-block" type="submit" onclick="login()">登录</button>
        </div>
    </div>
</form>
</body>
<script>
    function login() {
    
        $("#loginForm").validate({
    
            submitHandler: function (form) {
    
                doLogin();
            }
        });
    }

    function doLogin() {
    
        g_showLoading();

        var inputPass = $("#password").val();
        var salt = g_passsword_salt;
        var str = "" + salt.charAt(0) + salt.charAt(2) + inputPass + salt.charAt(5) + salt.charAt(4);
        var password = md5(str);

        $.ajax({
    
            url: "/login/doLogin",
            type: "POST",
            data: {
    
                mobile: $("#mobile").val(),
                password: password
            },
            success: function (data) {
    
                layer.closeAll();
                if (data.code == 200) {
    
                    layer.msg("成功");
                    console.log(data);
                    document.cookie = "userCookie=" + data.object;
                    window.location.href = "/goods/toList";
                } else {
    
                    layer.msg(data.message);
                }
            },
            error: function () {
    
                layer.closeAll();
            }
        });
    }
</script>
</html>

在这里插入图片描述

OKOKOOKOKOK

4、登录功能的实现

全局异常处理，以及 @NotNull等注解的使用

自定义校验手机号注解 @IsMobile

controller

    @RequestMapping("/doLogin")
    @ResponseBody
    public RespBean doLogin(@Valid LoginRequestParam param){
    

        log.info("{}",param);

        return userService.doLogin(param);
    }

参数

@Data
public class LoginRequestParam {
    

    @NotBlank(message = "mobile不能为空")
    @IsMobile
    private String mobile;

    @NotBlank(message = "password不能为空")
    @Length(min = 32,message = "password 长度不对")
    private String password;

}

service

@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    
    @Autowired(required = false)
    UserMapper userMapper;


    @Override
    public RespBean doLogin(LoginRequestParam param) {
    
        String password = param.getPassword();
        String mobile = param.getMobile();

        User user = userMapper.selectById(mobile);
        if (null == user){
    
            throw new GlobalException(RespBeanEnum.LOGIN_ERROR);
        }

        if (!MD5Util.formPassToDBPass(password,user.getSalt()).equals(user.getPassword())){
    
            throw new GlobalException(RespBeanEnum.LOGIN_ERROR);

        }
        return RespBean.success();
    }
}

由此可实现登录的异常处理
在这里插入图片描述
在这里插入图片描述
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完善 登录功能，采用 cookie + session 记录用户信息

1、使用 uuid 工具类 创建 cookie 的值

package com.example.seckill.util;

import java.util.UUID;

/** * UUID 工具类 */
public class UUIDUtil {
    
    public static String uuid() {
    
        return UUID.randomUUID().toString().replace("-", "");
    }
}

2、 cookie 工具类，对cookie进行操作

package com.example.seckill.util;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;

/** * Cookie工具类 * * @author: LC * @date 2022/3/2 5:48 下午 * @ClassName: CookieUtil */
public final class CookieUtil {
    

    /** * 得到Cookie的值, 不编码 * * @param request * @param cookieName * @return */
    public static String getCookieValue(HttpServletRequest request, String cookieName) {
    
        return getCookieValue(request, cookieName, false);
    }

    /** * 得到Cookie的值, * * @param request * @param cookieName * @return */
    public static String getCookieValue(HttpServletRequest request, String cookieName, boolean isDecoder) {
    
        Cookie[] cookieList = request.getCookies();
        if (cookieList == null || cookieName == null) {
    
            return null;
        }
        String retValue = null;
        try {
    
            for (int i = 0; i < cookieList.length; i++) {
    
                if (cookieList[i].getName().equals(cookieName)) {
    
                    if (isDecoder) {
    
                        retValue = URLDecoder.decode(cookieList[i].getValue(), "UTF-8");
                    } else {
    
                        retValue = cookieList[i].getValue();
                    }
                    break;
                }
            }
        } catch (UnsupportedEncodingException e) {
    
            e.printStackTrace();
        }
        return retValue;
    }

    /** * 得到Cookie的值, * * @param request * @param cookieName * @return */
    public static String getCookieValue(HttpServletRequest request, String cookieName, String encodeString) {
    
        Cookie[] cookieList = request.getCookies();
        if (cookieList == null || cookieName == null) {
    
            return null;
        }
        String retValue = null;
        try {
    
            for (int i = 0; i < cookieList.length; i++) {
    
                if (cookieList[i].getName().equals(cookieName)) {
    
                    retValue = URLDecoder.decode(cookieList[i].getValue(), encodeString);
                    break;
                }
            }
        } catch (UnsupportedEncodingException e) {
    
            e.printStackTrace();
        }
        return retValue;
    }

    /** * 设置Cookie的值 不设置生效时间默认浏览器关闭即失效,也不编码 */
    public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
                                 String cookieValue) {
    
        setCookie(request, response, cookieName, cookieValue, -1);
    }

    /** * 设置Cookie的值 在指定时间内生效,但不编码 */
    public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
                                 String cookieValue, int cookieMaxage) {
    
        setCookie(request, response, cookieName, cookieValue, cookieMaxage, false);
    }

    /** * 设置Cookie的值 不设置生效时间,但编码 */
    public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
                                 String cookieValue, boolean isEncode) {
    
        setCookie(request, response, cookieName, cookieValue, -1, isEncode);
    }

    /** * 设置Cookie的值 在指定时间内生效, 编码参数 */
    public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
                                 String cookieValue, int cookieMaxage, boolean isEncode) {
    
        doSetCookie(request, response, cookieName, cookieValue, cookieMaxage, isEncode);
    }

    /** * 设置Cookie的值 在指定时间内生效, 编码参数(指定编码) */
    public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
                                 String cookieValue, int cookieMaxage, String encodeString) {
    
        doSetCookie(request, response, cookieName, cookieValue, cookieMaxage, encodeString);
    }

    /** * 删除Cookie带cookie域名 */
    public static void deleteCookie(HttpServletRequest request, HttpServletResponse response,
                                    String cookieName) {
    
        doSetCookie(request, response, cookieName, "", -1, false);
    }

    /** * 设置Cookie的值，并使其在指定时间内生效 * * @param cookieMaxage cookie生效的最大秒数 */
    private static final void doSetCookie(HttpServletRequest request, HttpServletResponse response,
                                          String cookieName, String cookieValue, int cookieMaxage, boolean isEncode) {
    
        try {
    
            if (cookieValue == null) {
    
                cookieValue = "";
            } else if (isEncode) {
    
                cookieValue = URLEncoder.encode(cookieValue, "utf-8");
            }
            Cookie cookie = new Cookie(cookieName, cookieValue);
            if (cookieMaxage > 0)
                cookie.setMaxAge(cookieMaxage);
            if (null != request) {
    // 设置域名的cookie
                String domainName = getDomainName(request);
                System.out.println(domainName);
                if (!"localhost".equals(domainName)) {
    
                    cookie.setDomain(domainName);
                }
            }
            cookie.setPath("/");
            response.addCookie(cookie);
        } catch (Exception e) {
    
            e.printStackTrace();
        }
    }

    /** * 设置Cookie的值，并使其在指定时间内生效 * * @param cookieMaxage cookie生效的最大秒数 */
    private static final void doSetCookie(HttpServletRequest request, HttpServletResponse response,
                                          String cookieName, String cookieValue, int cookieMaxage, String encodeString) {
    
        try {
    
            if (cookieValue == null) {
    
                cookieValue = "";
            } else {
    
                cookieValue = URLEncoder.encode(cookieValue, encodeString);
            }
            Cookie cookie = new Cookie(cookieName, cookieValue);
            if (cookieMaxage > 0) {
    
                cookie.setMaxAge(cookieMaxage);
            }
            if (null != request) {
    // 设置域名的cookie
                String domainName = getDomainName(request);
                System.out.println(domainName);
                if (!"localhost".equals(domainName)) {
    
                    cookie.setDomain(domainName);
                }
            }
            cookie.setPath("/");
            response.addCookie(cookie);
        } catch (Exception e) {
    
            e.printStackTrace();
        }
    }

    /** * 得到cookie的域名 */
    private static final String getDomainName(HttpServletRequest request) {
    
        String domainName = null;
        // 通过request对象获取访问的url地址
        String serverName = request.getRequestURL().toString();
        if (serverName == null || serverName.equals("")) {
    
            domainName = "";
        } else {
    
            // 将url地下转换为小写
            serverName = serverName.toLowerCase();
            // 如果url地址是以http://开头 将http://截取
            if (serverName.startsWith("http://")) {
    
                serverName = serverName.substring(7);
            }
            int end = serverName.length();
            // 判断url地址是否包含"/"
            if (serverName.contains("/")) {
    
                //得到第一个"/"出现的位置
                end = serverName.indexOf("/");
            }

            // 截取
            serverName = serverName.substring(0, end);
            // 根据"."进行分割
            final String[] domains = serverName.split("\\.");
            int len = domains.length;
            if (len > 3) {
    
                // www.xxx.com.cn
                domainName = domains[len - 3] + "." + domains[len - 2] + "." + domains[len - 1];
            } else if (len <= 3 && len > 1) {
    
                // xxx.com or xxx.cn
                domainName = domains[len - 2] + "." + domains[len - 1];
            } else {
    
                domainName = serverName;
            }
        }

        if (domainName != null && domainName.indexOf(":") > 0) {
    
            String[] ary = domainName.split("\\:");
            domainName = ary[0];
        }
        return domainName;
    }
}

3、校验用户成功后生成 cookie,将cookie 与用户存进 session中

这是就需要 controller 中加上 HttpServletRequest ，HttpServletResponse 两个入参

@RequestMapping("/doLogin")
    @ResponseBody
    public RespBean doLogin(@Valid LoginRequestParam param,HttpServletRequest request,HttpServletResponse response){
    

        log.info("{}",param);

        return userService.doLogin(param, request, response);
    }

在用户校验通过后

package com.example.seckill.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.seckill.common.RespBean;
import com.example.seckill.common.RespBeanEnum;
import com.example.seckill.controller.parm.LoginRequestParam;
import com.example.seckill.exception.GlobalException;
import com.example.seckill.mapper.UserMapper;
import com.example.seckill.pojo.User;
import com.example.seckill.service.IUserService;
import com.example.seckill.util.CookieUtil;
import com.example.seckill.util.MD5Util;
import com.example.seckill.util.UUIDUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/** * <p> * 用户表 服务实现类 * </p> * * @author jobob * @since 2022-06-13 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    
    @Autowired(required = false)
    UserMapper userMapper;


    @Override
    public RespBean doLogin(LoginRequestParam param, HttpServletRequest request, HttpServletResponse response) {
    
        String password = param.getPassword();
        String mobile = param.getMobile();

        User user = userMapper.selectById(mobile);
        if (null == user){
    
            throw new GlobalException(RespBeanEnum.LOGIN_ERROR);
        }

        if (!MD5Util.formPassToDBPass(password,user.getSalt()).equals(user.getPassword())){
    
            throw new GlobalException(RespBeanEnum.LOGIN_ERROR);
        }

        /** * 校验用户成功后生成 cookie,将cookie 与用户存进 session中 */
        // 使用UUID生成 cookie
        String cookie = UUIDUtil.uuid();
        // 将 cookie 和用户存进 session 中
        request.getSession().setAttribute(cookie,user);
        // 设置 cookie
        CookieUtil.setCookie(request,response,"userCookie",cookie);


        return RespBean.success();
    }
}

此时点击登录会看到 cookie的值
在这里插入图片描述

4、goods Controller

在这里插入图片描述
因为登录成功会进行跳转商品列表页

<!doctype html>
<html lang="en"
      xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>商品列表</title>
</head>
<body>
<p th:text="'hello:' + ${user.nickname}"></p>
</body>
</html>


package com.example.seckill.controller;

import com.example.seckill.common.RespBean;
import com.example.seckill.controller.parm.LoginRequestParam;
import com.example.seckill.pojo.User;
import com.example.seckill.service.IGoodsService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpSession;


@RequestMapping("/goods")
@Controller
@Slf4j
public class GoodsController {
    

    @Autowired
    IGoodsService goodsService;


    /** * 跳转商品页 * @param session * @param model * @param cookie * @return */
    @RequestMapping("/toList")
    public String toList(HttpSession session, Model model, @CookieValue("userCookie") String cookie){
    

        if (StringUtils.isEmpty(cookie)){
     //如果 cookie为 空 跳转到 登录页面
            return "login";

        }
        // 从session 中获取用户
        User user = (User) session.getAttribute(cookie);

        if (null == user){
     // 如果用户信息为空 跳转登录
            return "login";
        }
        // 将用户信息 传到前端页面
        model.addAttribute("user",user);
        return "goodsList";

    }

}

此时点击登录 会跳转页面
在这里插入图片描述

原网站

版权声明
本文为[ジ你是我永远のbugグ]所创，转载请带上原文链接，感谢
https://blog.csdn.net/qq_47848696/article/details/125257124

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