第4章 Redis，一站式高性能存储方案【仿牛客网社区论坛项目】
- 前言
- 推荐
- 项目总结
-
- [第4章 Redis，一站式高性能存储方案](#第4章 Redis，一站式高性能存储方案)
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- [1. Redis入门](#1. Redis入门)
- [2. Spring整合Redis](#2. Spring整合Redis)
- 3.点赞
- 4.我收到的赞
- 5.关注、取消关注
- 6.关注列表、粉丝列表
- 7.优化登录模块
- 最后
前言
2023-4-30 20:42:51
以下内容源自【Java面试项目】
仅供学习交流使用
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仿牛客网项目【面试】
项目总结
第4章 Redis，一站式高性能存储方案
1. Redis入门
2. Spring整合Redis
3.点赞
java
@RequestMapping(path = "/like", method = RequestMethod.POST)
@ResponseBody
public String like(int entityType, int entityId, int entityUserId, int postId) {
//这里需要权限检查
User user = hostHolder.getUser();
// 点赞
likeService.like(user.getId(), entityType, entityId, entityUserId);
// 数量
long likeCount = likeService.findEntityLikeCount(entityType, entityId);
// 状态
int likeStatus = likeService.findEntityLikeStatus(user.getId(), entityType, entityId);
// 返回的结果
Map<String, Object> map = new HashMap<>();
map.put("likeCount", likeCount);
map.put("likeStatus", likeStatus);
// 触发点赞事件
if (likeStatus == 1) {
Event event = new Event()
.setTopic(TOPIC_LIKE)
.setUserId(hostHolder.getUser().getId())
.setEntityType(entityType)
.setEntityId(entityId)
.setEntityUserId(entityUserId)
.setData("postId", postId);
eventProducer.fireEvent(event);
}
if(entityType == ENTITY_TYPE_POST) {
// 计算帖子分数
String redisKey = RedisKeyUtil.getPostScoreKey();
redisTemplate.opsForSet().add(redisKey, postId);
}
return CommunityUtil.getJSONString(0, null, map);
}4.我收到的赞
5.关注、取消关注
java
@RequestMapping(path = "/follow", method = RequestMethod.POST)
@ResponseBody
public String follow(int entityType, int entityId) {
User user = hostHolder.getUser();
followService.follow(user.getId(), entityType, entityId);
// 触发关注事件
Event event = new Event()
.setTopic(TOPIC_FOLLOW)
.setUserId(hostHolder.getUser().getId())
.setEntityType(entityType)
.setEntityId(entityId)
.setEntityUserId(entityId);
eventProducer.fireEvent(event);
return CommunityUtil.getJSONString(0, "已关注!");
}
//取消关注
@RequestMapping(path = "/unfollow", method = RequestMethod.POST)
@ResponseBody
public String unfollow(int entityType, int entityId) {
User user = hostHolder.getUser();
followService.unfollow(user.getId(), entityType, entityId);
return CommunityUtil.getJSONString(0, "已取消关注!");
}6.关注列表、粉丝列表
java
//得到关注者
@RequestMapping(path = "/followees/{userId}", method = RequestMethod.GET)
public String getFollowees(@PathVariable("userId") int userId, Page page, Model model) {
User user = userService.findUserById(userId);
if (user == null) {
throw new RuntimeException("该用户不存在!");
}
model.addAttribute("user", user);
//分页信息
page.setLimit(5);
page.setPath("/followees/" + userId);
page.setRows((int) followService.findFolloweeCount(userId, ENTITY_TYPE_USER));
//查询关注者
List<Map<String, Object>> userList = followService.findFollowees(userId, page.getOffset(), page.getLimit());
if (userList != null) {
for (Map<String, Object> map : userList) {
User u = (User) map.get("user");
map.put("hasFollowed", hasFollowed(u.getId()));
}
}
model.addAttribute("users", userList);
return "site/followee";
}
//得到粉丝
@RequestMapping(path = "/followers/{userId}", method = RequestMethod.GET)
public String getFollowers(@PathVariable("userId") int userId, Page page, Model model) {
User user = userService.findUserById(userId);
if (user == null) {
throw new RuntimeException("该用户不存在!");
}
model.addAttribute("user", user);
//分页信息
page.setLimit(5);
page.setPath("/followers/" + userId);
page.setRows((int) followService.findFollowerCount(ENTITY_TYPE_USER, userId));
//查询粉丝
List<Map<String, Object>> userList = followService.findFollowers(userId, page.getOffset(), page.getLimit());
if (userList != null) {
for (Map<String, Object> map : userList) {
User u = (User) map.get("user");
map.put("hasFollowed", hasFollowed(u.getId()));
}
}
model.addAttribute("users", userList);
return "site/follower";
}7.优化登录模块
java
@RequestMapping(path = "/kaptcha",method = RequestMethod.GET)
public void getKaptcha(HttpServletResponse response/*, HttpSession session*/){
//生成验证码
String text = kaptchaProducer.createText();
BufferedImage image = kaptchaProducer.createImage(text);
//将验证码存入session
// session.setAttribute("kaptcha",text);
//验证码的归属者
String kaptchaOwner= CommunityUtil.generateUUID();
Cookie cookie=new Cookie("kaptchaOwner",kaptchaOwner);
cookie.setMaxAge(60);
cookie.setPath(contextPath);
response.addCookie(cookie);
// 将验证码存入redis
String redisKey= RedisKeyUtil.getKaptchaKey(kaptchaOwner);
redisTemplate.opsForValue().set(redisKey,text,60, TimeUnit.SECONDS);
//将图片输出给浏览器
response.setContentType("image/png");
try {
ServletOutputStream os = response.getOutputStream();
ImageIO.write(image,"png",os);
} catch (IOException e) {
logger.error("响应验证码失败："+e.getMessage());
}
}
@RequestMapping(path = "/login", method = RequestMethod.POST)
public String login(String username, String password, String code, boolean rememberme,
Model model, /*HttpSession session,*/ HttpServletResponse response,
@CookieValue("kaptchaOwner") String kaptchaOwner) {
//检查验证码
// String kaptcha = (String) session.getAttribute("kaptcha");
String kaptcha=null;
//Cookie-->kaptchaOwner-->(Redis)kaptcha
if (StringUtils.isNotBlank(kaptchaOwner)){
String redisKey=RedisKeyUtil.getKaptchaKey(kaptchaOwner);
kaptcha= (String) redisTemplate.opsForValue().get(redisKey);
}
if (StringUtils.isBlank(kaptcha) || StringUtils.isBlank(code) || !kaptcha.equalsIgnoreCase(code)) {
model.addAttribute("codeMsg", "验证码不正确!");
return "site/login";
}
// 检查账号,密码
int expiredSeconds = rememberme ? REMEMBER_EXPIRED_SECONDS : DEFAULT_EXPIRED_SECONDS;
Map<String, Object> map = userService.login(username, password, expiredSeconds);
if (map.containsKey("ticket")) {
Cookie cookie = new Cookie("ticket", map.get("ticket").toString());
cookie.setPath(contextPath);
cookie.setMaxAge(expiredSeconds);
response.addCookie(cookie);
return "redirect:/index";
} else {
model.addAttribute("usernameMsg", map.get("usernameMsg"));
model.addAttribute("passwordMsg", map.get("passwordMsg"));
return "site/login";
}
}
@RequestMapping(path = "/logout", method = RequestMethod.GET)
public String logout(@CookieValue("ticket") String ticket) {
userService.logout(ticket);
SecurityContextHolder.clearContext();
return "redirect:/login";
}最后
这篇博客能写好的原因是：站在巨人的肩膀上
这篇博客要写好的目的是：做别人的肩膀
开源：为爱发电
学习：为我而行'