• 匹配
• 按照条件匹配
• 精确匹配
• 区间范围匹配
• 匹配字段过滤
• 多条件查询
• 高亮查询

package com.kuang.config; import org.apache.http.HttpHost; import org.elasticsearch.client.RestClient; import org.elasticsearch.client.RestHighLevelClient; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; //狂神的spring两步骤： //1.找对象 //2.放到spring中用 @Configuration public class ElasticSearchConfig {// @Bean public RestHighLevelClient restHighLevelClient(){ RestHighLevelClient client = new RestHighLevelClient( RestClient.builder( new HttpHost("localhost", 9200, "http"), new HttpHost("localhost", 9201, "http"))); return client; } }

package com.kuang; import org.elasticsearch.client.RequestOptions; import org.elasticsearch.client.RestHighLevelClient; import org.elasticsearch.client.indices.CreateIndexRequest; import org.elasticsearch.client.indices.CreateIndexResponse; import org.junit.jupiter.api.Test; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.boot.test.context.SpringBootTest; import java.io.IOException; //es 高级客户端测试API @SpringBootTest class KuangshenEsApiApplicationTests { //面向对象来操作 @Autowired @Qualifier("restHighLevelClient")//这里的qualifier用来指定下面的client为原始的restHighLevelClient private RestHighLevelClient client; // 测试索引的创建 Request @Test void testCreateIndex() throws IOException { // 1.创建索引请求 相当于kibana中的PUT CreateIndexRequest request = new CreateIndexRequest("kuang_index"); // 2.执行创建请求IndicesClient ,请求后获得响应 CreateIndexResponse createIndexResponse = client.indices().create(request, RequestOptions.DEFAULT); System.out.println(createIndexResponse); }//测试获取索引判断是否存在某索引 @Test void testExistIndex() throws IOException { GetIndexRequest request = new GetIndexRequest("kuang_index"); boolean exists = client.indices().exists(request, RequestOptions.DEFAULT); System.out.println(exists); } // 测试删除索引 @Test void testDeleteIndex()throws IOException { DeleteIndexRequest request = new DeleteIndexRequest("testdb2"); AcknowledgedResponse delete = client.indices().delete(request, RequestOptions.DEFAULT); System.out.println(delete.isAcknowledged()); } }

• 创建索引
• 判断索引是否存在
• 删除索引
• 创建文档
• crud文档

package com.kuang.pojo; import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor; import org.springframework.stereotype.Component; @Data @AllArgsConstructor @NoArgsConstructor @Component public class User { private String name; private int age; }

@Test void testAddDocument(){ //创建对象 User user = new User("狂神说",3); IndexRequest request = new IndexRequest("kuang_index"); // 规则 put /kuang_index/_doc/1 request.id("1"); request.timeout(TimeValue.timeValueSeconds(1)); request.timeout("1s"); //将我们的数据放入请求 json request.source(JSON.toJSONString(user), XContentType.JSON); //客户端发送请求 IndexResponse indexResponse = client.index(request, RequestOptions.DEFAULT); System.out.println(indexResponse.toString()); // System.out.println(indexResponse.status()); //对应我们命令返回的状态 }

//获取文档的信息 @Test void testGetDocument() throws IOException { GetRequest getRequest = new GetRequest("kuang_index", "1"); GetResponse getResponse = client.get(getRequest, RequestOptions.DEFAULT); System.out.println(getResponse.getSourceAsString()); //打印文档的内容 System.out.println(getResponse); //返回的全部内容和命令是一样的 }

//更新文档的信息 @Test void testUpdateDocument() throws IOException { UpdateRequest updateRequest = new UpdateRequest("kuang_index","1"); updateRequest.timeout("1s"); User user = new User("狂神说Java", 18); updateRequest.doc(JSON.toJSONString(user),XContentType.JSON); UpdateResponse updateResponse = client.update(updateRequest, RequestOptions.DEFAULT); System.out.println(updateResponse.status()); }

//删除文档记录 @Test void testDeleteRequest() throws IOException { DeleteRequest request = new DeleteRequest("kuang_index", "1"); request.timeout("1s"); DeleteResponse deleteResponse = client.delete(request, RequestOptions.DEFAULT); System.out.println(deleteResponse.status()); }

//批量插入数据 @Test void testBulkRequest() throws IOException{ BulkRequest bulkRequest = new BulkRequest(); bulkRequest.timeout("10s"); //数据量大的时候，秒数可以增加ArrayList userList = new ArrayList<>(); userList.add(new User("psz",11)); userList.add(new User("psz2",12)); userList.add(new User("psz3",13)); userList.add(new User("psz4",14)); userList.add(new User("psz5",15)); //批处理请求 for (int i = 0; i < userList.size(); i++) { bulkRequest.add( new IndexRequest("kuang_index") .id(""+(i+1)) .source(JSON.toJSONString(userList.get(i)),XContentType.JSON)); } //请求+获得响应 BulkResponse bulkResponse = client.bulk(bulkRequest, RequestOptions.DEFAULT); System.out.println(bulkResponse.hasFailures()); //返回false：成功 }

package com.kuang.utils; public class ESconst { public static final String ES_INDEX = "kuang_index"; }

// 查询 // SearchRequest 搜索请求 // SearchSourceBuilder 条件构造 // HighlightBuilder 构建高亮 // TermQueryBuilder 精确查询 // MatchAllQueryBuilder // xxx QueryBuilder 对应我们刚才看到的命令 @Test void testSearch() throws IOException { SearchRequest searchRequest = new SearchRequest(ESconst.ES_INDEX); // 构建搜索的条件 SearchSourceBuilder sourceBuilder = new SearchSourceBuilder(); // 查询条件,可以使用querybuilders工具类实现 // QueryBuilders.termQuery精确匹配 // QueryBuilders.matchAllQuery匹配所有 TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("name", "qinjiang1"); //MatchAllQueryBuilder matchAllQueryBuilder = QueryBuilders.matchAllQuery(); sourceBuilder.query(termQueryBuilder); //分页 //sourceBuilder.from(); //sourceBuilder.size(); // 设置查询的时间 希望在60s内查出 sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS)); searchRequest.source(sourceBuilder); SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT); System.out.println(JSON.toJSONString(searchResponse.getHits())); System.out.println("--------------------------------------"); for (SearchHit documentFields : searchResponse.getHits().getHits()) { System.out.println(documentFields.getSourceAsMap()); } }

package com.kun.utils; import org.jsoup.Jsoup; import org.jsoup.nodes.Document; import org.jsoup.nodes.Element; import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; public class HtmlParseUtil { public static void main(String[] args) throws IOException { // 获取请求 https://search.jd.com/Search?keyword=java String url = "https://search.jd.com/Search?keyword=java"; //解析网页 Jsoup返回的就是浏览器Document对象 Document document = Jsoup.parse(new URL(url), 30000); Element element = document.getElementById("J_goodsList"); System.out.println(element.html()); //获取所有的li元素/标签 Elements elements = element.getElementsByTag("li"); //获取元素中的内容eq获取当前第一个元素，获取src属性 for (Element el : elements) { //关于这种图片特别多的网站，所有的图片都是延迟加载的！ String img = el.getElementsByTag("img").eq(0).attr("src"); String price = el.getElementsByClass("p-price").eq(0).text(); String title = el.getElementsByClass("p-name").eq(0).text(); System.out.println("==============================="); System.out.println(img); System.out.println(price); System.out.println(title); } }

package com.kun.pojo; import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor; @Data @NoArgsConstructor @AllArgsConstructor public class Content { private String title; private String img; private String price; //可以自己添加属性 }

package com.kun.utils; import com.kun.pojo.Content; import org.jsoup.Jsoup; import org.jsoup.nodes.Document; import org.jsoup.nodes.Element; import org.jsoup.select.Elements; import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import java.util.ArrayList; import java.util.List; @Component //丢进Springboot中 public class HtmlParseUtil { public static void main(String[] args) throws Exception { new HtmlParseUtil().parseJD("java").forEach(System.out::println); }public List parseJD(String keywords) throws Exception { // 获取请求 https://search.jd.com/Search?keyword=java String url = "https://search.jd.com/Search?keyword=" + keywords; //解析网页 Jsoup返回的就是浏览器Document对象 Document document = Jsoup.parse(new URL(url), 30000); //所有你在js中可以使用的方法，这里都可以使用 Element element = document.getElementById("J_goodsList"); //System.out.println(element.html()); //获取所有的li元素/标签 Elements elements = element.getElementsByTag("li"); //封装对象 ArrayList goodsList = new ArrayList(); //获取元素中的内容eq获取当前第一个元素，获取src属性 for (Element el : elements) { //关于这种图片特别多的网站，所有的图片都是延迟加载的！ String img = el.getElementsByTag("img").eq(0).attr("src"); String price = el.getElementsByClass("p-price").eq(0).text(); String title = el.getElementsByClass("p-name").eq(0).text(); Content content = new Content(); content.setImg(img); content.setPrice(price); content.setTitle(title); goodsList.add(content); //System.out.println("==============================="); //System.out.println(img); //System.out.println(price); //System.out.println(title); } return goodsList; } }

package com.kun.service; import com.alibaba.fastjson.JSON; import com.kun.pojo.Content; import com.kun.utils.HtmlParseUtil; import org.elasticsearch.action.bulk.BulkRequest; import org.elasticsearch.action.bulk.BulkResponse; import org.elasticsearch.action.index.IndexRequest; import org.elasticsearch.client.RequestOptions; import org.elasticsearch.client.RestHighLevelClient; import org.elasticsearch.common.xcontent.XContentType; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.annotation.Bean; import org.springframework.stereotype.Service; import java.util.List; //业务编写 @Service public class ContentService { @Autowired private RestHighLevelClient restHighLevelClient; //1.解析数据放入es索引中 public Boolean parseContent(String keywords) throws Exception { List contents = new HtmlParseUtil().parseJD(keywords); //把查询的数据放入我们的es中 BulkRequest bulkRequest = new BulkRequest(); bulkRequest.timeout("2m"); //批量插入 for (int i = 0; i < contents.size(); i++) { bulkRequest.add( new IndexRequest("jd_goods") .source(JSON.toJSONString(contents.get(i)), XContentType.JSON)); }BulkResponse bulk = restHighLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT); return !bulk.hasFailures(); } }

package com.kun.controller; import com.kun.service.ContentService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RestController; @RestController public class ContentController { @Autowired private ContentService contentService; @GetMapping("/parse/{keyword}") public Boolean parse(@PathVariable("keyword") String keywords) throws Exception { returncontentService.parseContent(keywords); } }

// 2. 获取数据实现搜索功能 public List> searchPage(String keyword,int pageNo,int pageSize) throws IOException { if(pageNo<=1){ pageNo = 1; } //条件搜索 SearchRequest searchRequest = new SearchRequest("jd_goods"); SearchSourceBuilder sourceBuilder = new SearchSourceBuilder(); //分页 sourceBuilder.from(pageNo); sourceBuilder.size(pageSize); //精准匹配 TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", keyword); sourceBuilder.query(termQueryBuilder); sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS)); //执行搜索 searchRequest.source(sourceBuilder); SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT); //解析结果 ArrayList> list = new ArrayList<>(); for (SearchHit documentFields : searchResponse.getHits().getHits()) { list.add(documentFields.getSourceAsMap()); } return list; }

@GetMapping("/parse/{keyword}/{pageNo}/{pageSize}") public List> search(@PathVariable("keyword") String keyword, @PathVariable("pageNo")int pageNo, @PathVariable("pageSize") int pageSize) throws IOException { return contentService.searchPage(keyword, pageNo, pageSize); }

//3. 新增高亮功能 public List> searchPageHighlightBuilder(String keyword,int pageNo,int pageSize) throws Exception { parseContent(keyword); if (pageNo <= 1) { pageNo = 1; } //条件搜索 SearchRequest searchRequest = new SearchRequest("jd_goods"); SearchSourceBuilder sourceBuilder = new SearchSourceBuilder(); //分页 sourceBuilder.from(pageNo); sourceBuilder.size(pageSize); //精准匹配 //TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", keyword); //sourceBuilder.query(termQueryBuilder); //sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS)); //match匹配 可以支持中文搜索 MatchQueryBuilder matchQueryBuilder = new MatchQueryBuilder("title", keyword); sourceBuilder.query(matchQueryBuilder); sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS)); //超时 //高亮 HighlightBuilder highlightBuilder = new HighlightBuilder(); highlightBuilder.field("title"); //高亮的字段 highlightBuilder.requireFieldMatch(false); //如果一句里面有多个关键词高亮，则只显示第一个 highlightBuilder.preTags(""); highlightBuilder.postTags(""); sourceBuilder.highlighter(highlightBuilder); //执行搜索 searchRequest.source(sourceBuilder); SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT); //解析结果 ArrayList> list = new ArrayList<>(); for (SearchHit hit : searchResponse.getHits().getHits()) {Map, HighlightField> highlightFields = hit.getHighlightFields(); //获取到高亮字段 HighlightField title = highlightFields.get("title"); Map, Object> sourceAsMap = hit.getSourceAsMap(); //原来的结果！要在结果里面将高亮置换一下 //解析高亮的字段 将原来的字段换为我们高亮的字段即可 if (title != null) { Text[] fragments = title.fragments(); String n_title = ""; for (Text text : fragments) { n_title += text; } sourceAsMap.put("title", n_title); //高亮字段替换掉原来的内容即可！ } list.add(sourceAsMap); } return list; }

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