elasticSearch从零整合springboot项目实操-编程知识

type会被弃用，就是说之后的elasticSearch中只会存在索引（indices）和一行（document）和字段（fields）

elasticSearch 和solr的区别最大的就是 es对应的是 json的格式。 solr有xml和josn等等。但是es更强

核心数据原理

对于某个字段搜索出来的结果有很多，更具相似的设置对应的文档的权重进行排序。

就像是这样建立索引

ik分词器，如果想要自定义的搜索的标签可以自行加到ik分词器中。ik分词器作为一个插件，需要手动的添加到elasticSearch中的plugin中。

分词算法，有ik_smart 和ik_max_word ，其中ik_smart为最少切分，ik_max_word是最细粒度切分。

ik_max_word：能够将所有的可能都展示出来

ik_smart：展示的比较少

如何定义自定义的分词

可以看见狂神说，不是一个分词。

可以在ik分词器中自定义一个狂神说

之后启动 es 和kibana 的bat ，再npm run start 页面head

这样，狂神说就变成了一个分词

es是支持Rest风格的api

这里进行添加数据

这里尝试在同一个索引库中添加类属于不同类型的数据

结论：直接报错。说在7.0版本上一个索引库只能够有一个类型。可以看出这个类型没有任何作用。对应如前面说所的，type这个字段在8.0将会被删除。

其实这玩意本质就是一个数据库。

get 这就不用说了，

上手springboot整合es Test

@SpringBootTest
class JueJiuApplicationTests {
@Autowired
private RedisTemplate redisTemplate;
@AutowiredTokenGenerate tokenGenerate;@AutowiredRestHighLevelClient highLevelClient;@AutowiredEssayService essayService;@Testvoid contextLoads() {}/**处理 Essay的数据** 这里将mysql的数据都batch到es中** */@Testvoid  mysqlAndES(){List<Essay> list = essayService.list();list.forEach(one->{System.out.println(one.toString());});}@Testvoid  createIndex() throws IOException {/*** 创建一个索引* */String   indexName = "juejiu";CreateIndexRequest  createIndexRequest = new CreateIndexRequest(indexName);highLevelClient.indices().create( createIndexRequest , RequestOptions.DEFAULT);/**查询索引的信息* *///            GetIndexRequest getIndexRequest = new GetIndexRequest(indexName);
//            GetIndexResponse getIndexResponse = highLevelClient
//                    .indices().get(getIndexRequest, RequestOptions.DEFAULT);
//            System.out.println("----------------打印出索引的信息" + getIndexResponse);/***  删除索引信息* */
//            DeleteIndexRequest  deleteIndexRequest = new DeleteIndexRequest(indexName)    ;
//            AcknowledgedResponse delete = highLevelClient.indices().delete(deleteIndexRequest, RequestOptions.DEFAULT);
//            System.out.println("----------------删除出索引的信息" + delete.toString());
//            System.out.println("----------------删除出索引的信息" + delete.isAcknowledged());}@Testvoid   saveToES() throws IOException {String   indexName = "juejiu";IPage<EssayDto> iPage = new Page<>();iPage.setCurrent(1);iPage.setSize(100);EssayVo essayVo = new EssayVo();IPage<EssayDto> page = essayService.getPage(iPage, essayVo);BulkRequest bulkRequest = new BulkRequest();page.getRecords().forEach(one->{IndexRequest indexRequest = new IndexRequest().source(JSON.toJSONString(one), XContentType.JSON).index(indexName);bulkRequest.add(indexRequest);});BulkResponse bulkResponse = highLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT);System.out.println("---------bulk的结果"+ (!bulkResponse.hasFailures()));}@Test/***/void  searchResult() throws IOException {String   indexName = "juejiu";SearchRequest searchRequest = new SearchRequest(indexName);SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();Query query = new Query(4,1);searchSourceBuilder.from(query.getCurrent());searchSourceBuilder.size(query.getSize());/**** 添加查询条件* */searchRequest.source(searchSourceBuilder);SearchResponse search = highLevelClient.search(searchRequest, RequestOptions.DEFAULT);System.out.println(search);System.out.println("-----------");System.out.println(search.getHits());search.getHits().forEach(one->{System.out.println("单个的hit"+one.getSourceAsString());});}

springboot整合ES实现论坛的 es替换查询

  String   indexName = "juejiu";SearchRequest searchRequest = new SearchRequest(indexName);SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();searchSourceBuilder.from(query.getCurrent());searchSourceBuilder.size(query.getSize());/**** 添加查询条件* */searchRequest.source(searchSourceBuilder);SearchResponse search = highLevelClient.search(searchRequest, RequestOptions.DEFAULT);/*** 暂停原代码  不返回page对象** */
//
//        System.out.println("-----------------------------"+query.toString());
//            System.out.println("-----------------------------"+essayVo.toString());
//        IPage<EssayDto> iPage = new Page<>();
//        iPage.setCurrent(query.getCurrent());
//        iPage.setSize(query.getSize());
//        IPage<EssayDto> list = essayService.getPage(iPage,essayVo);
//        HashMap hashMap = new HashMap<>();
//      list.getRecords().stream().map(one -> {
//            Date createTime = one.getCreateTime();
//            String essayTitle = one.getEssayTitle();
//            hashMap.put(createTime, essayTitle);
//            return  null;
//        }).collect(Collectors.toList());
//        System.out.println("----------------------------------------");
//        System.out.println(hashMap);IPage<EssayDto> iPage = new Page();List<EssayDto> list = new ArrayList<>();search.getHits().forEach(one->{Map<String, Object> sourceAsMap = one.getSourceAsMap();EssayDto essayDto = new EssayDto();essayDto.setEssayId((Integer) sourceAsMap.get("essayId"));essayDto.setEssayTitle(sourceAsMap.get("essayTitle").toString());essayDto.setEssayContext(sourceAsMap.get("essayContext").toString());essayDto.setEssayPageViewTimes((Integer) sourceAsMap.get("essayPageViewTimes"));essayDto.setCreateTime(Date.from(LocalDateTime.parse(sourceAsMap.get("createTime").toString(), DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")).atZone(ZoneId.systemDefault()).toInstant()));Map<String, Object> userMap = (Map<String, Object>) sourceAsMap.get("user");User user = new User();user.setId((Integer) userMap.get("id"));user.setAccount(userMap.get("account").toString());user.setPassword(userMap.get("password").toString());user.setAvatar(userMap.get("avatar").toString());user.setPhone(userMap.get("phone").toString());user.setRealName(userMap.get("realName").toString());user.setEmail(userMap.get("email").toString());user.setSex((Integer) userMap.get("sex"));
//            user.setBirthday(String.valueOf(Date.parse(userMap.get("birthday").toString())));essayDto.setUser(user);Map<String, Object> tagMap = (Map<String, Object>) sourceAsMap.get("tag");Tag tag = new Tag();tag.setTagId((Integer) tagMap.get("tagId"));tag.setTagName(tagMap.get("tagName").toString());essayDto.setTag(tag);essayDto.setUserId((Integer) sourceAsMap.get("userId"));essayDto.setEssayPageViewTimes((Integer) sourceAsMap.get("essayPageViewTimes"));essayDto.setCreateTime(Date.from(LocalDateTime.parse(sourceAsMap.get("createTime").toString(), DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")).atZone(ZoneId.systemDefault()).toInstant()));essayDto.setEssayId((Integer) sourceAsMap.get("essayId"));essayDto.setUser(user);essayDto.setTag(tag);list.add(essayDto);});iPage.setRecords(list);iPage.setCurrent(query.getCurrent());iPage.setSize(query.getSize());return Result.SUCCESS(iPage);

单体的es 实现easy

后续提供更新策略和多条件等结果