超详细讲解Java秒杀项目用户验证模块的实现

目录

• 一、用户验证
• 1、在方法内添加请求与反应
• 2、cookie操作的封装
• 3、UserServiceImpl
• 4、跳转界面PathController
•  二、全局session
• 1、导入依赖
• 2、配置yml文件redis
• 3、开启虚拟机
• 三、自定义redis实现功能
• 1、新建RedisConfig文件
• 2、实现全局session
•  四、使用参数解析器
• 1、新建WebConfig文件
• 2、定义参数解析器
• 3、PathController
• 4、访问主界面得到相关信息：

接着上期内容超详细讲解Java秒杀项目登陆模块的实现

一、用户验证

未登录的用户不能进入首页

根据上期内容，我未登录也能进入首页：

1、在方法内添加请求与反应

①、IUserService 

package com.example.seckill.service;
 
import com.example.seckill.pojo.User;
import com.baomidou.mybatisplus.extension.service.IService;
import com.example.seckill.util.response.ResponseResult;
import com.example.seckill.vo.UserVo;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
/**
 * 

 * 用户信息表 服务类
 * 
 *
 * @author lv
 * @since 2022-03-15
 */
public interface IUserService extends IService {
 
    ResponseResult findByAccount(UserVo userVo, HttpServletRequest request, HttpServletResponse response);
}

②、UserServiceImpl

③、UserController 

package com.example.seckill.controller;
 
import com.example.seckill.service.IUserService;
import com.example.seckill.util.response.ResponseResult;
import com.example.seckill.vo.UserVo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.validation.Valid;
 
/**
 * 

 * 用户信息表 前端控制器
 * 
 *
 * @author lv
 * @since 2022-03-15
 */
@RestController
@RequestMapping("/user")
public class UserController {
 
    @Autowired
    private IUserService userService;
 
//    用户登录
    @RequestMapping("/login")
 public ResponseResult login(@Valid UserVo userVo, HttpServletRequest request, HttpServletResponse response){
//     调用service的登录验证
     return userService.findByAccount(userVo,request,response);
 }
}

2、cookie操作的封装

package com.example.seckill.util;
 
import lombok.extern.slf4j.Slf4j;
 
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;
 
@Slf4j
public class CookieUtils {
 
    /**
     * @Description: 得到Cookie的值, 不编码
     */
    public static String getCookieValue(HttpServletRequest request, String cookieName) {
        return getCookieValue(request, cookieName, false);
    }
 
    /**
     * @Description: 得到Cookie的值
     */
    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;
    }
 
    /**
     * @Description: 得到Cookie的值
     */
    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;
    }
 
    /**
     * @Description: 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);
    }
 
    /**
     * @Description: 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);
    }
 
    /**
     * @Description: 设置Cookie的值 不设置生效时间,但编码
     * 在服务器被创建，返回给客户端，并且保存客户端
     * 如果设置了SETMAXAGE(int seconds)，会把cookie保存在客户端的硬盘中
     * 如果没有设置，会默认把cookie保存在浏览器的内存中
     * 一旦设置setPath()：只能通过设置的路径才能获取到当前的cookie信息
     */
    public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
                                 String cookieValue, boolean isEncode) {
        setCookie(request, response, cookieName, cookieValue, -1, isEncode);
    }
 
    /**
     * @Description: 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);
    }
 
    /**
     * @Description: 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);
    }
 
    /**
     * @Description: 删除Cookie带cookie域名
     */
    public static void deleteCookie(HttpServletRequest request, HttpServletResponse response,
                                    String cookieName) {
        doSetCookie(request, response, cookieName, null, -1, false);
    }
 
 
    /**
     * @Description: 设置Cookie的值，并使其在指定时间内生效
     */
    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);
                log.info("========== domainName: {} ==========", domainName);
                if (!"localhost".equals(domainName)) {
                    cookie.setDomain(domainName);
                }
            }
            cookie.setPath("/");
            response.addCookie(cookie);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
    /**
     * @Description: 设置Cookie的值，并使其在指定时间内生效
     */
    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);
                log.info("========== domainName: {} ==========", domainName);
                if (!"localhost".equals(domainName)) {
                    cookie.setDomain(domainName);
                }
            }
            cookie.setPath("/");
            response.addCookie(cookie);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
    /**
     * @Description: 得到cookie的域名
     */
    private static final String getDomainName(HttpServletRequest request) {
        String domainName = null;
 
        String serverName = request.getRequestURL().toString();
        if (serverName == null || serverName.equals("")) {
            domainName = "";
        } else {
            serverName = serverName.toLowerCase();
            serverName = serverName.substring(7);
            final int end = serverName.indexOf("/");
            serverName = serverName.substring(0, end);
            if (serverName.indexOf(":") > 0) {
                String[] ary = serverName.split("\\:");
                serverName = ary[0];
            }
 
            final String[] domains = serverName.split("\\.");
            int len = domains.length;
            if (len > 3 && !isIp(serverName)) {
                // 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;
            }
        }
        return domainName;
    }
 
    public static String trimSpaces(String IP) {//去掉IP字符串前后所有的空格
        while (IP.startsWith(" ")) {
            IP = IP.substring(1, IP.length()).trim();
        }
        while (IP.endsWith(" ")) {
            IP = IP.substring(0, IP.length() - 1).trim();
        }
        return IP;
    }
 
    public static boolean isIp(String IP) {//判断是否是一个IP
        boolean b = false;
        IP = trimSpaces(IP);
        if (IP.matches("\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}")) {
            String s[] = IP.split("\\.");
            if (Integer.parseInt(s[0]) < 255)
                if (Integer.parseInt(s[1]) < 255)
                    if (Integer.parseInt(s[2]) < 255)
                        if (Integer.parseInt(s[3]) < 255)
                            b = true;
        }
        return b;
    }
}

3、UserServiceImpl

//          最初版本（session），但Session内数据是服务器共用的
//        所有不让名字重复
        String ticket=UUID.randomUUID().toString().replace("-","");
        request.getSession().setAttribute(ticket,user);
//        将生成的ticket给用户，用户如何验证？使用cookie
        CookieUtils.setCookie(request,response,"ticket",ticket);

点击登录时，查看应用程序，cookie内有值

4、跳转界面PathController

跳转方法：

//    跳所有二级页面
    @RequestMapping("/{dir}/{path}")
    public String toPath(@PathVariable("dir") String dir, @PathVariable("path") String path, HttpServletRequest request){
        String ticket= CookieUtils.getCookieValue(request,"ticket");
        if(ticket==null){
            throw new BusinessException(ResponseResultCode.TICKET_ERROR);
        }
//        去session中取到ticket对应的用户，判断是否有值
        Object obj=request.getSession().getAttribute(ticket);
        if(obj==null){
            throw new BusinessException(ResponseResultCode.TICKET_ERROR);
 
        }
 
        return dir+"/"+path;
    }

未登录时访问主界面失败：只有登录成功后才能访问

 二、全局session

根据以上操作完后，session仍然有问题，，session只能在当前某一台服务器中，

需使用第三者完成数据共享，此处使用redis方式，将需要缓存的数据丢到缓存内

1、导入依赖

此处全局session是spring session中的一个，spring session就是spring中的一个文件

        
            org.apache.commons
            commons-pool2
        
        
        
            org.springframework.session
            spring-session-data-redis
        

2、配置yml文件redis

spring:
redis:
host: 47.100.191.44
password: xiaoli_redis
database: 0
port: 6379

3、开启虚拟机

现在开启虚拟机

三、自定义redis实现功能

完成全局session的作用

1、新建RedisConfig文件

用于操作redis

package com.example.seckill.config;
 
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
 
@Configuration
public class RedisConfig {
 
    public RedisTemplate redisTemplate(RedisConnectionFactory factory){
//        新建一个
        RedisTemplate redisTemplate=new RedisTemplate();
        //设置一下使用连接工厂
        redisTemplate.setConnectionFactory(factory);
//        额外设置
//        将key序列化操作，转化为string
        redisTemplate.setKeySerializer(new StringRedisSerializer());
//        value被转化为json
        redisTemplate.setValueSerializer(new GenericJackson2JsonRedisSerializer());
//          额外设置（hash 就是 map集合）
        redisTemplate.setHashKeySerializer(new StringRedisSerializer());
        redisTemplate.setHashValueSerializer(new GenericJackson2JsonRedisSerializer());
//        让设置生效
        redisTemplate.afterPropertiesSet();
        
        return redisTemplate;
 
    }
 
}

2、实现全局session

①、写个帮助类，用于调用

IRedisService接口：

package com.example.seckill.service;
 
import com.example.seckill.pojo.User;
 
public interface IRedisService {
 
    void putUserByTicket(String ticket, User user);
 
    User getUserByTicket(String ticket);
 
}

实现接口：

package com.example.seckill.service.impl;
 
import com.example.seckill.pojo.User;
import com.example.seckill.service.IRedisService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;
 
import java.util.concurrent.TimeUnit;
 
@Service
public class RedisServiceImpl implements IRedisService {
 
    @Autowired
    private RedisTemplate redisTemplate;
 
    @Override
    public void putUserByTicket(String ticket, User user) {
        redisTemplate.opsForValue().set("user:"+ticket,user,2L, TimeUnit.HOURS);
    }
 
    @Override
    public User getUserByTicket(String ticket) {
        Object obj=redisTemplate.opsForValue().get("user:"+ticket);
        if(obj==null || !(obj instanceof User)){
            return null;
        }
        return (User)obj;
    }
}

②、redisService到缓存中拿元素

    @Autowired
    private IRedisService redisService;
 
//    跳所有二级页面
    @RequestMapping("/{dir}/{path}")
    public String toPath(@PathVariable("dir") String dir, @PathVariable("path") String path, HttpServletRequest request){
//        获取用户的ticket
        String ticket= CookieUtils.getCookieValue(request,"ticket");
        if(ticket==null){
            throw new BusinessException(ResponseResultCode.TICKET_ERROR);
        }
//        去session中取到ticket对应的用户，判断是否有值
//        Object obj=request.getSession().getAttribute(ticket);
//        去缓存中拿元素
        User user=redisService.getUserByTicket(ticket);
        if(user==null){
            throw new BusinessException(ResponseResultCode.TICKET_ERROR);
 
        }
        return dir+"/"+path;
    }

③、放到缓存中

UserServiceImpl：

//          放到缓存中去
        redisService.putUserByTicket(ticket,user);

package com.example.seckill.service.impl;
 
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.UpdateWrapper;
import com.example.seckill.exception.BusinessException;
import com.example.seckill.pojo.User;
import com.example.seckill.mapper.UserMapper;
import com.example.seckill.service.IRedisService;
import com.example.seckill.service.IUserService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.seckill.util.CookieUtils;
import com.example.seckill.util.MD5Utils;
import com.example.seckill.util.ValidatorUtils;
import com.example.seckill.util.response.ResponseResult;
import com.example.seckill.util.response.ResponseResultCode;
import com.example.seckill.vo.UserVo;
import com.sun.deploy.nativesandbox.comm.Request;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.RequestBody;
 
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.websocket.Session;
import java.util.Date;
import java.util.UUID;
 
/**
 * 

 * 用户信息表 服务实现类
 * 
 *
 * @author lv
 * @since 2022-03-15
 */
@Service
public class UserServiceImpl extends ServiceImpl implements IUserService {
 
    @Autowired
    private IRedisService redisService;
 
    @Override
    public ResponseResult findByAccount(UserVo userVo, HttpServletRequest request, HttpServletResponse response) {
//        先判断信息是否符合（账号是否是手机号码，密码是不是空）
//         if(!ValidatorUtils.isMobile(userVo.getMobile())){
//             throw new BusinessException(ResponseResultCode.USER_ACCOUNT_NOT_MOBLIE);
//         }
//         if(StringUtils.isBlank(userVo.getPassword())){
//             throw new BusinessException(ResponseResultCode.USER_PASSWORD_NOT_MATCH);
//         }
//         再去数据库查出对应的用户（mobile）
        User user=this.getOne(new QueryWrapper().eq("id",userVo.getMobile()));
        if(user==null){
            throw new BusinessException(ResponseResultCode.USER_ACCOUNT_NOT_FIND);
        }
//        比较密码
//        二重加密（前端->后端，后端->数据库）
        String salt=user.getSalt();
//        将前台的加密密码和后端的盐再次进行加密
        String newPassword=MD5Utils.formPassToDbPass(userVo.getPassword(),salt);
        if(!newPassword.equals(user.getPassword())){
            throw new BusinessException(ResponseResultCode.USER_PASSWORD_NOT_MATCH);
        }
//        修改最后的登录时间
        this.update(new UpdateWrapper().eq("id",userVo.getMobile()).set("last_login_date",new Date()).setSql("login_count=login_count+1"));
//          最初版本（session），但Session内数据是服务器共用的
//        所有不让名字重复
        String ticket=UUID.randomUUID().toString().replace("-","");
//       放到全局或者当服务器的session
//        request.getSession().setAttribute(ticket,user);
//          放到缓存中去
        redisService.putUserByTicket(ticket,user);
//        将生成的ticket给用户，用户如何验证？使用cookie
        CookieUtils.setCookie(request,response,"ticket",ticket);
        return ResponseResult.success();
    }
}

④、LocalDateTime无法构造实例

LocalDateTime是Java8推荐使用的时间类，我此处无法转化，需要去配置解析器，我就改变实体类中的LocalDateTime改为时间戳Timestamp

 四、使用参数解析器

在controller类中方法内加上User实体类参数，查询出用户，自动将信息赋值

1、新建WebConfig文件

package com.example.seckill.config;
 
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
import java.util.List;
 
@Configuration
//打开mvc的功能
@EnableWebMvc
public class WebConfig implements WebMvcConfigurer {
 
    @Autowired
    private UserArgumentResolvers userArgumentResolvers;
 
    @Override
    public void addArgumentResolvers(List resolvers) {
        resolvers.add(userArgumentResolvers);
    }
 
//    使静态资源仍然可使用
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        //静态资源访问映射  映射路径 -> 本地资源路径
        registry.addResourceHandler("/static/**")
                .addResourceLocations("classpath:/static/");
    }
}

2、定义参数解析器

UserArgumentResolvers ：

package com.example.seckill.config;
 
import com.example.seckill.exception.BusinessException;
import com.example.seckill.pojo.User;
import com.example.seckill.service.IRedisService;
import com.example.seckill.util.CookieUtils;
import com.example.seckill.util.response.ResponseResultCode;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.MethodParameter;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;
 
import javax.servlet.http.HttpServletRequest;
 
@Component
public class UserArgumentResolvers implements HandlerMethodArgumentResolver {
 
 
    @Autowired
    private IRedisService redisService;
 
//    supportsParameter方法判断参数是否需要解析，决定了resolveArgument方法是否运行
    @Override
    public boolean supportsParameter(MethodParameter methodParameter) {
        return methodParameter.getParameterType() == User.class;
    }
 
//    解析参数
    @Override
    public Object resolveArgument(MethodParameter methodParameter, ModelAndViewContainer modelAndViewContainer, NativeWebRequest nativeWebRequest, WebDataBinderFactory webDataBinderFactory) throws Exception {
//       参数解析User,因为很多地方需要做登录验证
        HttpServletRequest request=(HttpServletRequest) nativeWebRequest.getNativeRequest();
        //        获取用户的ticket
        String ticket= CookieUtils.getCookieValue(request,"ticket");
        if(ticket==null){
            throw new BusinessException(ResponseResultCode.TICKET_ERROR);
        }
//        去session中取到ticket对应的用户，判断是否有值
//        Object obj=request.getSession().getAttribute(ticket);
//        去缓存中拿元素
        User user=redisService.getUserByTicket(ticket);
        if(user==null){
            throw new BusinessException(ResponseResultCode.TICKET_ERROR);
 
        }
        return user;//经过了参数解析后，参数会变成你这个地方返回的值
 
    }
}

3、PathController

package com.example.seckill.controller;
 
import com.example.seckill.exception.BusinessException;
import com.example.seckill.pojo.User;
import com.example.seckill.service.IRedisService;
import com.example.seckill.util.CookieUtils;
import com.example.seckill.util.response.ResponseResultCode;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
 
import javax.servlet.http.HttpServletRequest;
 
@Controller
public class PathController {
 
 
//    登录跳首页
    @RequestMapping("/")
    public String toPath(){
        return "login";
    }
 
//    跳所有二级页面
    @RequestMapping("/{dir}/{path}")
    public String toPath(@PathVariable("dir") String dir, @PathVariable("path") String path, User user){
        return dir+"/"+path;
    }
 
}

4、访问主界面得到相关信息：

本期内容结束~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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