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README
CC-BY-SA-4.0

社区项目介绍

项目总结

本项目是牛客网社区项目,实现了一个牛客网的论坛社区,基本功能包括登录注册、发帖评论、关注点赞等。

一、核心功能

  • 发帖、评论、私信、转发;
  • 点赞、关注、通知、搜索;
  • 权限、统计、调度、监控;

二、核心技术

  • Spring Boot、SSM
  • Redis、Kafka、ElasticSearch
  • Spring Security、Quatz、Caffeine

三、项目亮点

  • 项目构建在 Spring Boot + SSM 框架之上,并统一的进行了状态管理、事务管理、异常处理;
  • 利用 Redis 实现了点赞和关注功能,单机可达 5000TPS;
  • 利用 Kafka 实现了异步的站内通知,单机可达 7000TPS;
  • 利用 ElasticSearch 实现了全文搜索功能,可准确匹配搜索结果,并高亮显示关键词;
  • 利用 Caffeine + Redis 实现了两级缓存,并优化了热门帖子的访问,单机可达 8000QPS;
  • 利用 Spring Security 实现了权限控制,实现了多重角色、URL级别的权限管理;
  • 利用 HyperLogLog 、Bitmap 分别实现了 UV 、 DAU 的统计功能,100万用户数据只需数 M 内存空间;
  • 利用 Quartz 实现了任务调度功能,并实现了定时计算帖子分数、定时清理垃圾文件等功能;
  • 利用 Actuator 对应用的 Bean 、缓存、日志、路径等多个维度进行了监控,并通过自定义的端点对数据库连接进行了监控。

框架版本

  • 整体框架:Spring Boot 2.4.10、Spring 5.3.9 、jdk 14.0.1
  • 版本控制:Git 2.33.1
  • 数据库:MySQL 8.0.23 、Redis 3.2.100
  • 模板引擎:Thymeleaf
  • 应用服务器:Apache Tomcat 9.0.52
  • 消息队列:Kafka 2.12-2.8.1
  • 分布式搜索:Elasticsearch 6.4.3

Kafka 配置

打开 config 目录下的 zookeeper.properties 文件以及 server.properties 文件,分别修改其中的属性:

dataDir=D:/Java/IdeaProjects/community/log/zookeeper
log.dirs=D:/Java/IdeaProjects/community/log/kafka-logs

修改的目的是修改其日志以及数据文件的存放目录。

启动 kafka 的方式很简单,进入到安装目录之后,启动 cmd 输入 bin\windows\kafka-server-start.bat config\server.properties 启动 kafka ,之后报错:提示 ERROR Disk error while writing log start offsets checkpoint in directory 。查询解决方法,两种可能:① jdk 版本过低(安装的 14 ,原因除外);② 更换 Kafka 版本,按照提示,更换成 kafka_2.12-2.8.1 版本。下载链接:https://archive.apache.org/dist/kafka/2.8.1/kafka_2.12-2.8.1.tgz ,下载之后,修改两个配置文件,重新启动 zookeeper 以及 Kafka ,启动成功。

Elasticsearch 配置

进入到安装目录下的 config 目录中,打开 elasticsearch.yml 文件,配置其中的集群名字、data 数据文件夹、 logs 文件夹:

cluster.name: community
path.data: D:\Java\IdeaProjects\community\log\Elaticsearch-6.4.3\data
path.logs: D:\Java\IdeaProjects\community\log\Elaticsearch-6.4.3\logs

将中文检索词进行分词,需要下载一个分词插件。分词插件为 IK 分词插件。

下载地址:GitHub - medcl/elasticsearch-analysis-ik: The IK Analysis plugin integrates Lucene IK analyzer into elasticsearch, support customized dictionary.

下载之后,将文件解压缩到 ES 安装目录的 plugins 目录中,在此新建一个 ik 文件夹,解压缩至此即可。

Spring 整合 ES 时出现的问题,避免踩坑:

遇到的问题:因为 Spring Boot 版本不一致问题,导致导入的 ES 版本无法和本地安装的 ES 进行配置。在实体类上标注 type 属性找不到该 value 值,最后在 maven 仓库找到教程中 2.1.5 版本的 Spring Boot 对应的 ES 依赖版本为 3.1.8.RELEASE 版本,在 ES 依赖上标注即可。

查找版本对应的关系可以在网站:Maven Repository: org.springframework.boot » spring-boot-starter-data-elasticsearch » 2.1.5.RELEASE (mvnrepository.com) 找到。

重新配置版本依赖之后,依然会出现 org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'discussPostRepository' 错误的提示。更换 Spring Boot 的版本为 2.1.5.RELEASE 版本。之后出现插件加载错误:Cannot resolve plugin org.apache.maven.plugins:maven-site-plugin:3.7.1 提示。解决办法:向 pom.xml 文件中添加具体版本依赖:

<dependency>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-site-plugin</artifactId>
<version>3.7.1</version>
</dependency>

重新下载一下指定的依赖。

之后还是发生了依赖错误的问题,最终降级 Spring Boot 版本,将 Spring Boot 版本降级到 2.1.5.RELEASE 得以解决。降级的时候不只修改 <version> ,还需要删除可能产生冲突的依赖。最后直接删除 repository 文件夹得以解决。

之后测试的时候又出现错误:mapper [createTime] of different type, current_type [long], merged_type [date] 导致整个服务不能正常启动。查看提示发现是类型不匹配导致的,但是检查发现实体类代码不存在错误。clean install 清除缓存都尝试了之后还是不行,最后重新启动 ES 服务器,通过 postman 将已经存在的 ES 索引删除,之后重新进行测试,成功! 原因:ES 中的索引和映射发生了改变 解决:删除 ES 中已经存在的索引和映射,重新导入

至此,ES 导致的错误全部解决了。

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社区论坛项目,具体文档可以参看:https://blog.csdn.net/qq_43103529/article/details/122105888 展开 收起
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