文章目錄

• 1. ElasticsearchService
• • 1.1 注入bean
  • 1.2 保存（修改）和刪除
  • 1.3 搜索 searchDiscussPost
• 2. DiscussPostController.addDiscussPost
• 3. CommentController.addComment
• 4. EventConsumer.handlePublishMessage
• 5. SearchController
• • 5.1 注入屬性
  • 5.2 搜索帖子
• 6. index.html
• 7. search.html

1. ElasticsearchService

1.1 注入bean

@Autowired private DiscussPostRepository discussRepository;@Autowired private ElasticsearchTemplate elasticTemplate;

1.2 保存（修改）和刪除

public void saveDiscussPost(DiscussPost post) {discussRepository.save(post); }public void deleteDiscussPost(int id) {discussRepository.deleteById(id); }

1.3 搜索 searchDiscussPost

返回參數：Page類型數據，封裝多條數據

傳入參數：關鍵字keyword，當前頁數current，每頁顯示數據limit

搜索邏輯，參考前置技術（九）

查詢關鍵字

排序

分頁

高亮顯示

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));// 處理高亮顯示的結果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());}}); }

2. DiscussPostController.addDiscussPost

發帖后把帖子存入es

@Autowired private EventProducer eventProducer;// 觸發發帖事件 Event event = new Event().setTopic(TOPIC_PUBLISH).setUserId(user.getId()).setEntityType(ENTITY_TYPE_POST).setEntityId(post.getId()); eventProducer.fireEvent(event);

CommunityConstant 中增加常量

/*** 主題: 發帖*/ String TOPIC_PUBLISH = "publish";

3. CommentController.addComment

觸發評論帖子事后后觸發發帖事件

if (comment.getEntityType() == ENTITY_TYPE_POST) {// 觸發發帖事件event = new Event().setTopic(TOPIC_PUBLISH).setUserId(comment.getUserId()).setEntityType(ENTITY_TYPE_POST).setEntityId(discussPostId);eventProducer.fireEvent(event); }

4. EventConsumer.handlePublishMessage

消費發帖事件

// 消費發帖事件 @KafkaListener(topics = {TOPIC_PUBLISH}) public void handlePublishMessage(ConsumerRecord record) {if (record == null || record.value() == null) {logger.error("消息的內容為空!");return;}Event event = JSONObject.parseObject(record.value().toString(), Event.class);if (event == null) {logger.error("消息格式錯誤!");return;}DiscussPost post = discussPostService.findDiscussPostById(event.getEntityId());elasticsearchService.saveDiscussPost(post); }

5. SearchController

5.1 注入屬性

@Autowired private ElasticsearchService elasticsearchService;@Autowired private UserService userService;@Autowired private LikeService likeService;

5.2 搜索帖子

調用service查詢

把數據存入一個map

把數據傳給模板

傳遞分頁信息

// search?keyword=xxx @RequestMapping(path = "/search", method = RequestMethod.GET) 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());// 聚合數據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()));// 點贊數量map.put("likeCount", likeService.findEntityLikeCount(ENTITY_TYPE_POST, post.getId()));discussPosts.add(map);}}model.addAttribute("discussPosts", discussPosts);model.addAttribute("keyword", keyword);// 分頁信息page.setPath("/search?keyword=" + keyword);page.setRows(searchResult == null ? 0 : (int) searchResult.getTotalElements());return "/site/search"; }

6. 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>

7. search.html

模板

路徑

頭部復用

js路徑

遍歷

<li class="media pb-3 pt-3 mb-3 border-bottom" th:each="map:${discussPosts}">

頭像

<img th:src="${map.user.headerUrl}" class="mr-4 rounded-circle" alt="用戶頭像" style="width:50px;height:50px;">

標題

<h6 class="mt-0 mb-3"><a th:href="@{|/discuss/detail/${map.post.id}|}" th:utext="${map.post.title}">備戰<em>春招</em>，面試刷題跟他復習，一個月全搞定！</a> </h6>

帖子作者

<u class="mr-3" th:utext="${map.user.username}">寒江雪</u>

發布時間，贊，回復信息

發布于 <b th:text="${#dates.format(map.post.createTime,'yyyy-MM-dd HH:mm:ss')}">2019-04-15 15:32:18</b> <ul class="d-inline float-right"><li class="d-inline ml-2">贊 <i th:text="${map.likeCount}">11</i></li><li class="d-inline ml-2">|</li><li class="d-inline ml-2">回復 <i th:text="${map.post.commentCount}">7</i></li> </ul>

分頁復用

<!-- 分頁 --> <nav class="mt-5" th:replace="index::pagination"><ul class="pagination justify-content-center"><li class="page-item"><a class="page-link" href="#">首頁</a></li><li class="page-item disabled"><a class="page-link" href="#">上一頁</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="#">下一頁</a></li><li class="page-item"><a class="page-link" href="#">末頁</a></li></ul> </nav>

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