论坛项目进展06
作者：互联网
第6章 Elasticsearch，分布式搜索引擎
6.1 Elasticsearch入门
6.2 Spring整合Elasticsearch
把数据库里的帖子存到es服务器里，然后从es服务器里去搜索.
在DiscussPost实例类上加上：
@Document(indexName = "discusspost", type = "_doc", shards = 6, replicas = 3)//会自动将实体数据和es服务器里面的索引做映射，discusspost是索引名，shards为分片，分6片。replicas表示副本，备份三份。
public class DiscussPost {
@Id
private int id;
@Field(type = FieldType.Integer)
private int userId;
// 互联网校招
@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;
@Field(type = FieldType.Integer)
private int type;
@Field(type = FieldType.Integer)
private int status;
@Field(type = FieldType.Date)
private Date createTime;
@Field(type = FieldType.Integer)
private int commentCount;
@Field(type = FieldType.Double)
private double score;
。。。。。
}
访问es和访问mysql不一样，所以在dao包下建一个子包elasticsearch,在其下建DiscussPostRepository：
@Repository
public interface DiscussPostRepository extends ElasticsearchRepository<DiscussPost, Integer> {
}
6.3 开发社区搜索功能
service增加：ElasticsearchService
@Service
public class ElasticsearchService {
@Autowired
private DiscussPostRepository discussRepository;
@Autowired
private 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() {
@Override
public <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());
}
});
}
}
在DiscussPostController的addDiscussPost发帖方法和CommentController的addComment分别加上：
// 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);
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);
在EventConsumer中加上：
// 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);//把查到的帖子存到es服务器里
}
新建SearchController
@Controller
public class SearchController implements CommunityConstant {
@Autowired
private ElasticsearchService elasticsearchService;
@Autowired
private UserService userService;
@Autowired
private LikeService likeService;
// 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";
}
}
标签：06,String,进展,private,toString,论坛,new,post,type 来源： https://www.cnblogs.com/zhangshuai2496689659/p/16394601.html