秒杀项目之用户验证
续上期内容
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.zxy.seckill.service;
import com.zxy.seckill.pojo.User;
import com.baomidou.mybatisplus.extension.service.IService;
import com.zxy.seckill.util.response.ResponseResult;
import com.zxy.seckill.vo.UserVo;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*
* 用户信息表 服务类
*
*
* @author zxy
* @since 2022-03-15
*/
public interface IUserService extends IService {
ResponseResult findByAccount(UserVo uservo, HttpServletRequest request, HttpServletResponse response);
}
②、UserServiceImpl
package com.zxy.seckill.service.impl;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.UpdateWrapper;
import com.sun.deploy.nativesandbox.comm.Request;
import com.zxy.seckill.exception.BusinessException;
import com.zxy.seckill.pojo.User;
import com.zxy.seckill.mapper.UserMapper;
import com.zxy.seckill.service.IUserService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.zxy.seckill.util.CookieUtils;
import com.zxy.seckill.util.MD5Utils;
import com.zxy.seckill.util.ValidatorUtils;
import com.zxy.seckill.util.response.ResponseResult;
import com.zxy.seckill.util.response.ResponseResultCode;
import com.zxy.seckill.vo.UserVo;
import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Service;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Date;
import java.util.UUID;
/**
*
* 用户信息表 服务实现类
*
*
* @author zxy
* @since 2022-03-15
*/
@Service
public class UserServiceImpl extends ServiceImpl implements IUserService {
@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("-","");
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); return ResponseResult.success();
}
}
③、UserController
package com.zxy.seckill.controller;
import com.zxy.seckill.service.IUserService;
import com.zxy.seckill.util.response.ResponseResult;
import com.zxy.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 zxy
* @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.zxy.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：
package com.zxy.seckill.controller;
import com.zxy.seckill.exception.BusinessException;
import com.zxy.seckill.util.CookieUtils;
import com.zxy.seckill.util.response.ResponseResultCode;
import org.springframework.stereotype.Controller;
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";
}
// 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: 127.0.0.1
password:
database: 0
port: 6379
3、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.zxy.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.zxy.seckill.service;
import com.zxy.seckill.pojo.User;
import com.zxy.seckill.pojo.User;
public interface IRedisService {
void putUserByTicket(String ticket, User user);
User getUserByTicket(String ticket);
}实现接口：
package com.zxy.seckill.service.impl;
import com.zxy.seckill.pojo.User;
import com.zxy.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.zxy.seckill.service.impl;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.UpdateWrapper;
import com.zxy.seckill.exception.BusinessException;
import com.zxy.seckill.pojo.User;
import com.zxy.seckill.mapper.UserMapper;
import com.zxy.seckill.service.IRedisService;
import com.zxy.seckill.service.IUserService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.zxy.seckill.util.CookieUtils;
import com.zxy.seckill.util.MD5Utils;
import com.zxy.seckill.util.ValidatorUtils;
import com.zxy.seckill.util.response.ResponseResult;
import com.zxy.seckill.util.response.ResponseResultCode;
import com.zxy.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.zxy.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.zxy.seckill.config;
import com.zxy.seckill.exception.BusinessException;
import com.zxy.seckill.pojo.User;
import com.zxy.seckill.service.IRedisService;
import com.zxy.seckill.util.CookieUtils;
import com.zxy.seckill.util.response.ResponseResultCode;
import com.zxy.seckill.service.IRedisService;
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.zxy.seckill.controller;
import com.zxy.seckill.exception.BusinessException;
import com.zxy.seckill.pojo.User;
import com.zxy.seckill.service.IRedisService;
import com.zxy.seckill.util.CookieUtils;
import com.zxy.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：
