秒杀项目(二)之验证功能&&全局共享&&参数解析器
目录
一、验证功能
1、将原有方法调用request以及response类
3、UserServiceImpl类编写
4、路径控制类的编写
二、全局共享
1、为什么要使用全局共享
2、导入全局共享依赖
3、配置redis配置
4、全局共享示意图
三、自定义redis完成全局共享
1、定义一个redisconfig类，用来连接redis
2、编写service层，以及实现类
3、用可视化工具连接redis
4、进行测试，实现redis进行数据共享
四、使用参数解析器
1、为什么会使用参数解析器
2、编写webconfig类
3、配置UserArgumentResolvers类
一、验证功能
在上次做的登录功能中有很过纰漏，并且有好多功能没有完善，比A登录进去之后，并且进行了商品的购买，后者有用户B登录进去了，那么A用户购买的商品就会进入到B用户中，这样的逻辑是行不通的，所以就要实现验证功能！验证功能使用的ticket，用cookie来进行实现
1、将原有方法调用request以及response类
IUserService：
package com.zj.seckill.service;
import com.zj.seckill.pojo.User;
import com.baomidou.mybatisplus.extension.service.IService;
import com.zj.seckill.util.response.ResponseResult;
import com.zj.seckill.vo.UserVo;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*
* 用户信息表 服务类
*
*
* @author zj
* @since 2022-03-15
*/
public interface IUserService extends IService {
ResponseResult findByAccount(UserVo userVo, HttpServletRequest request, HttpServletResponse response);
}
UserServiceImpl：
UserController：
2、导入cookie帮助类
CookieUtils：
package com.zj.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
@SuppressWarnings("all")
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类编写
String ticket = UUID.randomUUID().toString().replace("-", "");
request.getSession().setAttribute(ticket,user);
CookieUtils.setCookie(request,response,"ticket",ticket);4、路径控制类的编写
package com.zj.seckill.controller;
import com.zj.seckill.exception.BusinessException;
import com.zj.seckill.util.CookieUtils;
import com.zj.seckill.util.response.ResponseResultCode;
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 {
@RequestMapping("/")
public String toPath() {
return "login";
}
@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;
}
}
效果：
二、全局共享
1、为什么要使用全局共享
因为在我们在进行秒杀抢购，一台服务器支撑不了整个秒杀活动，所以就要进行全局共享，提供出第三者，来分担整个秒杀活动的压力
2、导入全局共享依赖
org.apache.commons
commons-pool2
org.springframework.session
spring-session-data-redis
3、配置redis配置
redis:
host: 127.0.0.1
# password: 123456
database: 0
port: 6379
4、全局共享示意图
三、自定义redis完成全局共享
1、定义一个redisconfig类，用来连接redis
package com.zj.seckill.config;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.context.annotation.Bean;
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
@SuppressWarnings("all")
public class RedisConfig {
@Bean
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(string)
redisTemplate.setKeySerializer(new StringRedisSerializer());
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、编写service层，以及实现类
IRedisService：
在service中编写两个方法，一个是增加，另一个是得到
package com.zj.seckill.service;
import com.zj.seckill.pojo.User;
@SuppressWarnings("all")
public interface IRedisService {
void putUserByTicket(String ticket, User user);
User getUserByTicket(String ticket);
}
RedisServiceImpl：
package com.zj.seckill.service.impl;
import com.zj.seckill.pojo.User;
import com.zj.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
@SuppressWarnings("all")
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;
}
}
3、用可视化工具连接redis
4、进行测试，实现redis进行数据共享
因为在代码中打了"user:"，所以会创建一个文件夹
redisTemplate.opsForValue().set("user:"+ticket,user,2L, TimeUnit.HOURS);
四、使用参数解析器
1、为什么会使用参数解析器
因为在一个大型秒杀系统中，用户每进一个页面就会实现用户验证功能，所以就会使用到参数解析器
2、编写webconfig类
package com.zj.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
@EnableWebMvc
@SuppressWarnings("all")
public class WebConfig implements WebMvcConfigurer {
@Autowired
private UserArgumentResolvers userArgumentsResolvers;
/**
* 參數解析器
* Argument參數
* HandlerMethodArgumentResolver 处理方法中参数的解析器
* @param resolvers
*/
@Override
public void addArgumentResolvers(List resolvers) {
resolvers.add(userArgumentsResolvers);
}
/**
* 让js文件继续生效
* @param registry
*/
@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/");
}
}
3、配置UserArgumentResolvers类
这个类两个方法是相关联的，进入第一个方法后，如果通过就会进入到第二个方法中
package com.zj.seckill.config;
import com.zj.seckill.exception.BusinessException;
import com.zj.seckill.pojo.User;
import com.zj.seckill.service.IRedisService;
import com.zj.seckill.util.CookieUtils;
import com.zj.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;
/**
* 声明为一个组件
*/
@Component
@SuppressWarnings("all")
public class UserArgumentResolvers implements HandlerMethodArgumentResolver {
//supportsParameter决定了resolveArgument是否运行
//此方法会进入三次，有三个参数
//xd(int OrderId,double OrderSum,User user)
@Autowired
private IRedisService redisService;
/**
* 针对user参数进行解析
* supportsParameter决定了resolveArgument是否会运行
* getParameterType 获得参数的类型
* @param methodParameter
* @return
*/
@Override
public boolean supportsParameter(MethodParameter methodParameter) {
return methodParameter.getParameterType() == User.class;
}
/**
* 解析参数
* @param methodParameter
* @param modelAndViewContainer
* @param nativeWebRequest
* @param webDataBinderFactory
* @return
* @throws Exception
*/
@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
User user = redisService.getUserByTicket(ticket);
if(user==null){
throw new BusinessException(ResponseResultCode.TICKET_ERROR);
}
return user;
//经过了参数解析之后 参数会变成你这个地方返回的值
}
}
成功！