仿牛客论坛项目

一、Elasticsearch入门
- 1.1 elasticsearch安装
- 1.2 修改config目录下的elasticsearch.yml配置文件
- 1.3 配置环境变量
- 1.4 下载ik中文分词器
- 1.5 下载postman
- 1.6 启动es
- 1.7 测试是否正确启动
- 1.8 操作ES的RESTful语法
- 1.9 es弹性搜索指南
- 1.10 es中的数据类型
二、 Spring整合Elasticsearch
- 2.1 导入依赖
- 2.2 修改配置文件
- 2.3 修改主启动类
- 2.4 实体类添加es注解
- 2.5 数据操作
- - DiscussPostRepository
- 2.6 测试
三、开发社区搜索功能
- 3.1 业务层
- - ElasticSearchService(封装对es的增删改查操作)
- 3.2 控制层
- - DiscussPostController
  - CommentController
  - SearchController
- 3.3 新增事件
- - EventConsumer
- 3.4 静态资源
- - index.html
  - serch.html
- 3.4 测试

一、Elasticsearch入门

1.1 elasticsearch安装

https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-6.4.3.zip

下载后直接解压

1.2 修改config目录下的elasticsearch.yml配置文件

1.3 配置环境变量

1.4 下载ik中文分词器

https://github.com/medcl/elasticsearch-analysis-ik/releases/download/v6.4.3/elasticsearch-analysis-ik-6.4.3.zip

下载之后解压到es安装目录下的plugins目录下的ik(自己建)目录下
如果需要引入自己建的字典,则自己建一个dic文件,把需要的新词加入进去,然后在下面文件引入即可

1.5 下载postman

https://www.getpostman.com

1.6 启动es

1.7 测试是否正确启动

1.8 操作ES的RESTful语法

1.9 es弹性搜索指南

https://www.elastic.co/guide/en/elasticsearch/reference/6.4/index.html

1.10 es中的数据类型

https://www.elastic.co/guide/en/elasticsearch/reference/6.4/mapping-types.html

二、 Spring整合Elasticsearch

2.1 导入依赖

 <!--整合elasticsearch--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-elasticsearch</artifactId></dependency>

2.2 修改配置文件

# ElasticsearchProperties
# 集群名
spring.data.elasticsearch.cluster-name=nowcoder
# tcp端口:9300, http访问端口:9200
spring.data.elasticsearch.cluster-nodes=127.0.0.1:9300

2.3 修改主启动类

避免es和redis同时依赖netty起冲突

@SpringBootApplication
@MapperScan("com.nowcoder.community.mapper")
public class CommunityApplication {@PostConstructpublic void init() {// 解决netty启动冲突问题// see Netty4Utils.setAvailableProcessors()System.setProperty("es.set.netty.runtime.available.processors", "false");}public static void main(String[] args) {SpringApplication.run(CommunityApplication.class, args);}}

2.4 实体类添加es注解

在程序启动时会自动在es中创建索引

@Data
//index必须为lowercase不然会报错 index:类似mysql中的数据库,type:类似mysql中的表,shards:分片(将数据分成几片),replicas:副本(3份)
@Document(indexName = "discusspost", type = "_doc", shards = 6, replicas = 3)
public class DiscussPost {/*** 自增主键,插入数据后将自增主键设置到对象中*/@TableId(type = IdType.AUTO)@Idprivate Integer id;@Field(type = FieldType.Integer)private Integer userId;//文本类型,将对应的内容拆分成最多的词,搜索时搜索最常见的分词即可@Field(type = FieldType.Text, analyzer = "ik_max_word", searchAnalyzer = "ik_smart")private String title;@Field(type = FieldType.Text, analyzer = "ik_max_word", searchAnalyzer = "ik_smart")private String content;//0-普通; 1-置顶;@Field(type = FieldType.Integer)private Integer type;//0-正常; 1-精华; 2-拉黑;@Field(type = FieldType.Integer)private Integer status;@Field(type = FieldType.Date)private Date createTime;@Field(type = FieldType.Integer)private Integer commentCount;@Field(type = FieldType.Double)private Double score;}

2.5 数据操作

DiscussPostRepository

@Repository
public interface DiscussPostRepository extends ElasticsearchRepository<DiscussPost, Integer> {}

2.6 测试

@RunWith(SpringRunner.class)
@SpringBootTest
@ContextConfiguration(classes = CommunityApplication.class)
public class ElasticsearchTests {@Resourceprivate DiscussPostMapper discussPostMapper;@Resourceprivate DiscussPostService discussPostService;@Resourceprivate DiscussPostRepository discussRepository;@Resourceprivate ElasticsearchTemplate elasticTemplate;/*** 每次添加单条数据*/@Testpublic void testInsert() {discussRepository.save(discussPostMapper.selectById(241));discussRepository.save(discussPostMapper.selectById(242));discussRepository.save(discussPostMapper.selectById(243));}/*** 每次添加多条数据*/@Testpublic void testInsertList() {discussRepository.saveAll(discussPostService.findDiscussPosts(101, 0, 100));discussRepository.saveAll(discussPostService.findDiscussPosts(102, 0, 100));discussRepository.saveAll(discussPostService.findDiscussPosts(103, 0, 100));discussRepository.saveAll(discussPostService.findDiscussPosts(111, 0, 100));discussRepository.saveAll(discussPostService.findDiscussPosts(112, 0, 100));discussRepository.saveAll(discussPostService.findDiscussPosts(131, 0, 100));discussRepository.saveAll(discussPostService.findDiscussPosts(132, 0, 100));discussRepository.saveAll(discussPostService.findDiscussPosts(133, 0, 100));discussRepository.saveAll(discussPostService.findDiscussPosts(134, 0, 100));}/*** 测试更新*/@Testpublic void testUpdate() {DiscussPost post = discussPostMapper.selectById(231);post.setContent("我是新人,使劲灌水.");discussRepository.save(post);}/*** 测试删除*/@Testpublic void testDelete() {// discussRepository.deleteById(231);discussRepository.deleteAll();}/*** 测试查询*/@Testpublic void testSearchByRepository() {SearchQuery searchQuery = new NativeSearchQueryBuilder().withQuery(QueryBuilders.multiMatchQuery("互联网寒冬", "title", "content")).withSort(SortBuilders.fieldSort("type").order(SortOrder.DESC)).withSort(SortBuilders.fieldSort("score").order(SortOrder.DESC)).withSort(SortBuilders.fieldSort("createTime").order(SortOrder.DESC)).withPageable(PageRequest.of(0, 10)).withHighlightFields(new HighlightBuilder.Field("title").preTags("<em>").postTags("</em>"),new HighlightBuilder.Field("content").preTags("<em>").postTags("</em>")).build();// elasticTemplate.queryForPage(searchQuery, class, SearchResultMapper)// 底层获取得到了高亮显示的值, 但是没有返回.Page<DiscussPost> page = discussRepository.search(searchQuery);System.out.println(page.getTotalElements());System.out.println(page.getTotalPages());System.out.println(page.getNumber());System.out.println(page.getSize());for (DiscussPost post : page) {System.out.println(post);}}@Testpublic void testSearchByTemplate() {SearchQuery searchQuery = new NativeSearchQueryBuilder().withQuery(QueryBuilders.multiMatchQuery("互联网寒冬", "title", "content")).withSort(SortBuilders.fieldSort("type").order(SortOrder.DESC)).withSort(SortBuilders.fieldSort("score").order(SortOrder.DESC)).withSort(SortBuilders.fieldSort("createTime").order(SortOrder.DESC)).withPageable(PageRequest.of(0, 10)).withHighlightFields(new HighlightBuilder.Field("title").preTags("<em>").postTags("</em>"),new HighlightBuilder.Field("content").preTags("<em>").postTags("</em>")).build();Page<DiscussPost> page = elasticTemplate.queryForPage(searchQuery, DiscussPost.class, new SearchResultMapper() {@Overridepublic <T> AggregatedPage<T> mapResults(SearchResponse response, Class<T> aClass, Pageable pageable) {SearchHits hits = response.getHits();if (hits.getTotalHits() <= 0) {return null;}List<DiscussPost> list = new ArrayList<>();for (SearchHit hit : hits) {DiscussPost post = new DiscussPost();String id = hit.getSourceAsMap().get("id").toString();post.setId(Integer.valueOf(id));String userId = hit.getSourceAsMap().get("userId").toString();post.setUserId(Integer.valueOf(userId));String title = hit.getSourceAsMap().get("title").toString();post.setTitle(title);String content = hit.getSourceAsMap().get("content").toString();post.setContent(content);String status = hit.getSourceAsMap().get("status").toString();post.setStatus(Integer.valueOf(status));String createTime = hit.getSourceAsMap().get("createTime").toString();post.setCreateTime(new Date(Long.valueOf(createTime)));String commentCount = hit.getSourceAsMap().get("commentCount").toString();post.setCommentCount(Integer.valueOf(commentCount));// 处理高亮显示的结果HighlightField titleField = hit.getHighlightFields().get("title");if (titleField != null) {post.setTitle(titleField.getFragments()[0].toString());}HighlightField contentField = hit.getHighlightFields().get("content");if (contentField != null) {post.setContent(contentField.getFragments()[0].toString());}list.add(post);}return new AggregatedPageImpl(list, pageable,hits.getTotalHits(), response.getAggregations(), response.getScrollId(), hits.getMaxScore());}});System.out.println(page.getTotalElements());System.out.println(page.getTotalPages());System.out.println(page.getNumber());System.out.println(page.getSize());for (DiscussPost post : page) {System.out.println(post);}}}

测试testinsert()方法和testInsertList()方法
GET: localhost:9200/discusspost/_search: 查询discusspost索引下的文档
查询指定的文档数据
调用修改方法修改上面这条数据的content
测试删除方法

三、开发社区搜索功能

3.1 业务层

ElasticSearchService(封装对es的增删改查操作)

@Service
public class ElasticsearchService {@Resourceprivate DiscussPostRepository discussRepository;@Resourceprivate ElasticsearchTemplate elasticTemplate;public void saveDiscussPost(DiscussPost post) {discussRepository.save(post);}public void deleteDiscussPost(int id) {discussRepository.deleteById(id);}public Page<DiscussPost> searchDiscussPost(String keyword, int current, int limit) {SearchQuery searchQuery = new NativeSearchQueryBuilder().withQuery(QueryBuilders.multiMatchQuery(keyword, "title", "content")).withSort(SortBuilders.fieldSort("type").order(SortOrder.DESC)).withSort(SortBuilders.fieldSort("score").order(SortOrder.DESC)).withSort(SortBuilders.fieldSort("createTime").order(SortOrder.DESC)).withPageable(PageRequest.of(current, limit)).withHighlightFields(new HighlightBuilder.Field("title").preTags("<em>").postTags("</em>"),new HighlightBuilder.Field("content").preTags("<em>").postTags("</em>")).build();return elasticTemplate.queryForPage(searchQuery, DiscussPost.class, new SearchResultMapper() {@Overridepublic <T> AggregatedPage<T> mapResults(SearchResponse response, Class<T> aClass, Pageable pageable) {SearchHits hits = response.getHits();if (hits.getTotalHits() <= 0) {return null;}List<DiscussPost> list = new ArrayList<>();for (SearchHit hit : hits) {DiscussPost post = new DiscussPost();String id = hit.getSourceAsMap().get("id").toString();post.setId(Integer.valueOf(id));String userId = hit.getSourceAsMap().get("userId").toString();post.setUserId(Integer.valueOf(userId));String title = hit.getSourceAsMap().get("title").toString();post.setTitle(title);String content = hit.getSourceAsMap().get("content").toString();post.setContent(content);String status = hit.getSourceAsMap().get("status").toString();post.setStatus(Integer.valueOf(status));String createTime = hit.getSourceAsMap().get("createTime").toString();post.setCreateTime(new Date(Long.valueOf(createTime)));String commentCount = hit.getSourceAsMap().get("commentCount").toString();post.setCommentCount(Integer.valueOf(commentCount));// 处理高亮显示的结果HighlightField titleField = hit.getHighlightFields().get("title");if (titleField != null) {post.setTitle(titleField.getFragments()[0].toString());}HighlightField contentField = hit.getHighlightFields().get("content");if (contentField != null) {post.setContent(contentField.getFragments()[0].toString());}list.add(post);}return new AggregatedPageImpl(list, pageable,hits.getTotalHits(), response.getAggregations(), response.getScrollId(), hits.getMaxScore());}});}}

3.2 控制层

DiscussPostController

 @PostMapping("/add")@ResponseBodypublic String addDiscussPost(String title, String content) {User user = UserThreadLocal.getUser();if (user == null) {return CommunityUtil.getJSONString(403, "你还没有登录喔!");}DiscussPost post = new DiscussPost();post.setUserId(user.getId());post.setTitle(title);post.setContent(content);post.setCreateTime(new Date());post.setType(0);post.setStatus(0);post.setCommentCount(0);discussPostService.addDiscussPost(post);// 触发发帖事件Event event = new Event().setTopic(TOPIC_PUBLISH).setUserId(user.getId()).setEntityType(ENTITY_TYPE_POST).setEntityId(post.getId());eventProducer.fireEvent(event);// 报错的情况,将来统一处理.return CommunityUtil.getJSONString(0, "发布成功!");}

CommentController

@PostMapping("/add/{discussPostId}")public String addComment(@PathVariable("discussPostId") int discussPostId, Comment comment) {comment.setUserId(UserThreadLocal.getUser().getId());comment.setStatus(0);comment.setCreateTime(new Date());commentService.addComment(comment);// 触发评论事件Event event = new Event().setTopic(TOPIC_COMMENT).setUserId(UserThreadLocal.getUser().getId()).setEntityType(comment.getEntityType()).setEntityId(comment.getEntityId()).setData("postId", discussPostId);if (comment.getEntityType() == ENTITY_TYPE_POST) {DiscussPost target = discussPostService.findDiscussPostById(comment.getEntityId());event.setEntityUserId(target.getUserId());} else if (comment.getEntityType() == ENTITY_TYPE_COMMENT) {Comment target = commentService.findCommentById(comment.getEntityId());event.setEntityUserId(target.getUserId());}eventProducer.fireEvent(event);if (comment.getEntityType() == ENTITY_TYPE_POST) {// 触发发帖事件event = new Event().setTopic(TOPIC_PUBLISH).setUserId(comment.getUserId()).setEntityType(ENTITY_TYPE_POST).setEntityId(discussPostId);eventProducer.fireEvent(event);}return "redirect:/discuss/detail/" + discussPostId;}

SearchController

@Controller
public class SearchController implements CommunityConstant {@Resourceprivate ElasticsearchService elasticsearchService;@Resourceprivate UserService userService;@Resourceprivate LikeService likeService;// search?keyword=xxx@GetMapping("/search")public String search(String keyword, Page page, Model model) {// 搜索帖子org.springframework.data.domain.Page<DiscussPost> searchResult =elasticsearchService.searchDiscussPost(keyword, page.getCurrent() - 1, page.getLimit());// 聚合数据List<Map<String, Object>> discussPosts = new ArrayList<>();if (searchResult != null) {for (DiscussPost post : searchResult) {Map<String, Object> map = new HashMap<>();// 帖子map.put("post", post);// 作者map.put("user", userService.findUserById(post.getUserId()));// 点赞数量map.put("likeCount", likeService.findEntityLikeCount(ENTITY_TYPE_POST, post.getId()));discussPosts.add(map);}}model.addAttribute("discussPosts", discussPosts);model.addAttribute("keyword", keyword);// 分页信息page.setPath("/search?keyword=" + keyword);page.setRows(searchResult == null ? 0 : (int) searchResult.getTotalElements());return "/site/search";}}

3.3 新增事件

EventConsumer

 // 消费发帖事件@KafkaListener(topics = {TOPIC_PUBLISH})public void handlePublishMessage(ConsumerRecord record) {if (record == null || record.value() == null) {logger.error("消息的内容为空!");return;}Event event = JSONObject.parseObject(record.value().toString(), Event.class);if (event == null) {logger.error("消息格式错误!");return;}DiscussPost post = discussPostService.findDiscussPostById(event.getEntityId());elasticsearchService.saveDiscussPost(post);}

3.4 静态资源

index.html

<!-- 搜索 --><form class="form-inline my-2 my-lg-0" method="get" th:action="@{/search}"><input class="form-control mr-sm-2" type="search" aria-label="Search" name="keyword" th:value="${keyword}"/><button class="btn btn-outline-light my-2 my-sm-0" type="submit">搜索</button></form>

serch.html

<!doctype html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"><link rel="icon" href="https://static.nowcoder.com/images/logo_87_87.png"/><link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" crossorigin="anonymous"><link rel="stylesheet" th:href="@{/css/global.css}" /><title>牛客网-搜索结果</title>
</head>
<body>
<div class="nk-container"><!-- 头部 --><header class="bg-dark sticky-top" th:replace="index::header"><div class="container"><!-- 导航 --><nav class="navbar navbar-expand-lg navbar-dark"><!-- logo --><a class="navbar-brand" href="#"></a><button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation"><span class="navbar-toggler-icon"></span></button><!-- 功能 --><div class="collapse navbar-collapse" id="navbarSupportedContent"><ul class="navbar-nav mr-auto"><li class="nav-item ml-3 btn-group-vertical"><a class="nav-link" href="../index.html">首页</a></li><li class="nav-item ml-3 btn-group-vertical"><a class="nav-link position-relative" href="letter.html">消息<span class="badge badge-danger">12</span></a></li><li class="nav-item ml-3 btn-group-vertical"><a class="nav-link" href="register.html">注册</a></li><li class="nav-item ml-3 btn-group-vertical"><a class="nav-link" href="login.html">登录</a></li><li class="nav-item ml-3 btn-group-vertical dropdown"><a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"><img src="http://images.nowcoder.com/head/1t.png" class="rounded-circle" style="width:30px;"/></a><div class="dropdown-menu" aria-labelledby="navbarDropdown"><a class="dropdown-item text-center" href="profile.html">个人主页</a><a class="dropdown-item text-center" href="setting.html">账号设置</a><a class="dropdown-item text-center" href="login.html">退出登录</a><div class="dropdown-divider"></div><span class="dropdown-item text-center text-secondary">nowcoder</span></div></li></ul><!-- 搜索 --><form class="form-inline my-2 my-lg-0" action="search.html"><input class="form-control mr-sm-2" type="search" aria-label="Search" /><button class="btn btn-outline-light my-2 my-sm-0" type="submit">搜索</button></form></div></nav></div></header><!-- 内容 --><div class="main"><div class="container"><h6><b class="square"></b> 相关帖子</h6><!-- 帖子列表 --><ul class="list-unstyled mt-4"><li class="media pb-3 pt-3 mb-3 border-bottom" th:each="map:${discussPosts}"><img th:src="${map.user.headerUrl}" class="mr-4 rounded-circle" alt="用户头像" style="width:50px;height:50px;"><div class="media-body"><h6 class="mt-0 mb-3"><a th:href="@{|/discuss/detail/${map.post.id}|}" th:utext="${map.post.title}">备战<em>春招</em>，面试刷题跟他复习，一个月全搞定！</a></h6><div class="mb-3" th:utext="${map.post.content}">金三银四的金三已经到了，你还沉浸在过年的喜悦中吗？ 如果是，那我要让你清醒一下了：目前大部分公司已经开启了内推，正式网申也将在3月份陆续开始，金三银四，<em>春招</em>的求职黄金时期已经来啦！！！ 再不准备，作为19应届生的你可能就找不到工作了。。。作为20届实习生的你可能就找不到实习了。。。 现阶段时间紧，任务重，能做到短时间内快速提升的也就只有算法了， 那么算法要怎么复习？重点在哪里？常见笔试面试算法题型和解题思路以及最优代码是怎样的？ 跟左程云老师学算法，不仅能解决以上所有问题，还能在短时间内得到最大程度的提升！！！</div><div class="text-muted font-size-12"><u class="mr-3" th:utext="${map.user.username}">寒江雪</u>发布于 <b th:text="${#dates.format(map.post.createTime,'yyyy-MM-dd HH:mm:ss')}">2019-04-15 15:32:18</b><ul class="d-inline float-right"><li class="d-inline ml-2">赞 <i th:text="${map.likeCount}">11</i></li><li class="d-inline ml-2">|</li><li class="d-inline ml-2">回复 <i th:text="${map.post.commentCount}">7</i></li></ul></div></div></li></ul><!-- 分页 --><nav class="mt-5" th:replace="index::pagination"><ul class="pagination justify-content-center"><li class="page-item"><a class="page-link" href="#">首页</a></li><li class="page-item disabled"><a class="page-link" href="#">上一页</a></li><li class="page-item active"><a class="page-link" href="#">1</a></li><li class="page-item"><a class="page-link" href="#">2</a></li><li class="page-item"><a class="page-link" href="#">3</a></li><li class="page-item"><a class="page-link" href="#">4</a></li><li class="page-item"><a class="page-link" href="#">5</a></li><li class="page-item"><a class="page-link" href="#">下一页</a></li><li class="page-item"><a class="page-link" href="#">末页</a></li></ul></nav></div></div><!-- 尾部 --><footer class="bg-dark" th:replace="index::footer"><div class="container"><div class="row"><!-- 二维码 --><div class="col-4 qrcode"><img src="https://uploadfiles.nowcoder.com/app/app_download.png" class="img-thumbnail" style="width:136px;" /></div><!-- 公司信息 --><div class="col-8 detail-info"><div class="row"><div class="col"><ul class="nav"><li class="nav-item"><a class="nav-link text-light" href="#">关于我们</a></li><li class="nav-item"><a class="nav-link text-light" href="#">加入我们</a></li><li class="nav-item"><a class="nav-link text-light" href="#">意见反馈</a></li><li class="nav-item"><a class="nav-link text-light" href="#">企业服务</a></li><li class="nav-item"><a class="nav-link text-light" href="#">联系我们</a></li><li class="nav-item"><a class="nav-link text-light" href="#">免责声明</a></li><li class="nav-item"><a class="nav-link text-light" href="#">友情链接</a></li></ul></div></div><div class="row"><div class="col"><ul class="nav btn-group-vertical company-info"><li class="nav-item text-white-50">公司地址：北京市朝阳区大屯路东金泉时代3-2708北京牛客科技有限公司</li><li class="nav-item 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</div><script src="https://code.jquery.com/jquery-3.3.1.min.js" crossorigin="anonymous"></script>
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<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" crossorigin="anonymous"></script>
<script th:src="@{/js/global.js}"></script>
</body>
</html>

3.4 测试

每次发帖和对帖子评论都会使用kafka异步更新es中对应的数据,我们直接新增一个帖子,然后搜索我们刚创建的帖子

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