1.引入依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-elasticsearch</artifactId>
<version>2.6.3</version>
</dependency>
2.config配置文件
@Configuration
public class RestClientConfig extends AbstractElasticsearchConfiguration {
@Override
@Bean
public RestHighLevelClient elasticsearchClient() {
final ClientConfiguration clientConfiguration =ClientConfiguration.builder()
.connectedTo("xx.xxx.xxx.xx:9200") //地址
.build();
return RestClients.create(clientConfiguration).rest();
}
}会返回两个客户端对象，分别是ElasticsearchOperations和RestHighLevelClient(更推荐使用)。前者是通过面向对象的形式来操作的，后者是通过客户端的方式操作的。
3.索引相关操作
/*
索引相关操作
*/
public class Test1 {
RestHighLevelClient restHighLevelClient;
@Before
public void init(){
final ClientConfiguration clientConfiguration =ClientConfiguration.builder()
.connectedTo("xx.xxxx.xxx.xx:xxxx")
.build();
this.restHighLevelClient = RestClients.create(clientConfiguration).rest();
}
@Test//创建索引
public void createIndex() throws IOException {
CreateIndexRequest createIndexRequest = new CreateIndexRequest("products");
//指定映射 参数1：指定映射json结构 参数2：指定数据类型
createIndexRequest.mapping("{\n" +
" \"properties\": {\n" +
" \"id\":{\n" +
" \"type\":\"integer\"\n" +
" },\n" +
" \"title\":{\n" +
" \"type\":\"keyword\"\n" +
" },\n" +
" \"price\":{\n" +
" \"type\":\"double\"\n" +
" },\n" +
" \"created_at\":{\n" +
" \"type\":\"date\"\n" +
" },\n" +
" \"description\":{\n" +
" \"type\":\"text\",\n" +
" \"analyzer\": \"ik_max_word\"\n" +
" }\n" +
" }\n" +
" }", XContentType.JSON);
//参数1：创建索引请求对象 参数2：请求配置对象
CreateIndexResponse createIndexResponse = restHighLevelClient.indices().create(createIndexRequest, RequestOptions.DEFAULT);
System.out.println("创建状态："+createIndexResponse.isAcknowledged()); //打印返回信息
restHighLevelClient.close(); //关闭资源
}
@Test//删除索引
public void deleteIndex() throws IOException {
AcknowledgedResponse acknowledgedResponse = restHighLevelClient.indices().delete(new DeleteIndexRequest("products"), RequestOptions.DEFAULT);
System.out.println("删除状态："+acknowledgedResponse.isAcknowledged()); //打印返回信息
restHighLevelClient.close(); //关闭资源
}
}4.文档相关操作
/*
文档相关操作(document)
*/
public class Test2 {
RestHighLevelClient restHighLevelClient;
@Before
public void init(){
final ClientConfiguration clientConfiguration =ClientConfiguration.builder()
.connectedTo("xx.xxx.xxx.xx:9200")
.build();
this.restHighLevelClient = RestClients.create(clientConfiguration).rest();
}
@Test //创建文档
public void createDoc() throws IOException {
IndexRequest indexRequest = new IndexRequest("products");
indexRequest.id("2") //手动指定文档的id，如果不指定则会用uuid
.source("{\n" +
" \"title\":\"瑞星咖啡\",\n" +
" \"price\": 9.8,\n" +
" \"created_at\":\"2023-11-18\",\n" +
" \"description\":\"瑞星咖啡我最爱了，好喝\"\n" +
"}", XContentType.JSON);
//参数1：索引请求对象，参数2：请求配置对象
IndexResponse indexResponse = restHighLevelClient.index(indexRequest, RequestOptions.DEFAULT);
System.out.println(indexResponse.status());
restHighLevelClient.close();
}
@Test //修改文档
public void updateDoc() throws IOException {
UpdateRequest updateRequest = new UpdateRequest("products","1");
updateRequest.doc("{\n" +
" \"title\":\"库迪咖啡非\"\n" +
" }",XContentType.JSON);
//参数1：索引请求对象，参数2：请求配置对象
UpdateResponse updateResponse = restHighLevelClient.update(updateRequest, RequestOptions.DEFAULT);
System.out.println(updateResponse.status());
restHighLevelClient.close();
}
@Test //删除文档
public void deleteDoc() throws IOException {
DeleteRequest deleteRequest = new DeleteRequest("products","2");
//参数1：索引请求对象，参数2：请求配置对象
DeleteResponse deleteResponse = restHighLevelClient.delete(deleteRequest, RequestOptions.DEFAULT);
System.out.println(deleteResponse.status());
restHighLevelClient.close();
}
@Test //基于id查询文档
public void searchDocById() throws IOException {
GetRequest getRequest = new GetRequest("products", "1");
GetResponse getResponse = restHighLevelClient.get(getRequest, RequestOptions.DEFAULT);
System.out.println(getResponse.getId());
System.out.println(getResponse.getSourceAsString());
}
}5.高级查询
public class Test3 {
RestHighLevelClient restHighLevelClient;
@Before
public void init(){
final ClientConfiguration clientConfiguration =ClientConfiguration.builder()
.connectedTo("xx.xxx.xxx.xx:9200")
.build();
this.restHighLevelClient = RestClients.create(clientConfiguration).rest();
}
@Test //查询一个索引中的所有文档
public void searchAll() throws IOException {
SearchRequest searchRequest = new SearchRequest("products");
searchRequest.source(new SearchSourceBuilder().query(QueryBuilders.matchAllQuery()));//查询所有
//参数1：搜索请求对象 参数2：请求配置对象
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
System.out.println("查询出来的总条数："+searchResponse.getHits().getTotalHits().value);
System.out.println("查询出来的最大得分"+searchResponse.getHits().getMaxScore());
//拿到数据结果
SearchHit[] hits = searchResponse.getHits().getHits();
for(SearchHit hit:hits){
String id = hit.getId();
System.out.println("id: "+id+" source: "+hit.getSourceAsString());
}
}
@Test //基于关键词查询
public void search() throws IOException {
SearchRequest searchRequest = new SearchRequest("products");
searchRequest.source(new SearchSourceBuilder().query(QueryBuilders.termQuery("description","好喝")));//查询所有
//参数1：搜索请求对象 参数2：请求配置对象
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
System.out.println("查询出来的总条数："+searchResponse.getHits().getTotalHits().value);
System.out.println("查询出来的最大得分"+searchResponse.getHits().getMaxScore());
//拿到数据结果
SearchHit[] hits = searchResponse.getHits().getHits();
for(SearchHit hit:hits){
String id = hit.getId();
System.out.println("id: "+id+" source: "+hit.getSourceAsString());
}
}
/*
* 分页查询
* 排序
* 字段
*/
@Test //分页查询 与排序
public void search2() throws IOException {
SearchRequest searchRequest = new SearchRequest("products");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.matchAllQuery())
.from(1) //起始位置 start=(page-1)*size
.size(1) //每页显示条数
.sort("price", SortOrder.ASC) //字段排序
.fetchSource(new String[]{},new String[]{"created_at"}); //参数1：包含字段数组 参数2：排除字段数组
searchRequest.source(searchSourceBuilder);//查询所有
//参数1：搜索请求对象 参数2：请求配置对象
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
System.out.println("查询出来的总条数："+searchResponse.getHits().getTotalHits().value);
System.out.println("查询出来的最大得分"+searchResponse.getHits().getMaxScore());
//拿到数据结果
SearchHit[] hits = searchResponse.getHits().getHits();
for(SearchHit hit:hits){
String id = hit.getId();
System.out.println("id: "+id+" source: "+hit.getSourceAsString());
}
}
@Test //高亮
public void search3() throws IOException {
SearchRequest searchRequest = new SearchRequest("products");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
HighlightBuilder highlightBuilder = new HighlightBuilder();
highlightBuilder.requireFieldMatch(false).field("description").field("title").preTags("<span style='color:red;'>").postTags("</span>");
searchSourceBuilder.query(QueryBuilders.termQuery("description","好喝"))
.highlighter(highlightBuilder);
searchRequest.source(searchSourceBuilder);//查询所有
//参数1：搜索请求对象 参数2：请求配置对象
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
System.out.println("查询出来的总条数："+searchResponse.getHits().getTotalHits().value);
System.out.println("查询出来的最大得分"+searchResponse.getHits().getMaxScore());
//拿到数据结果
SearchHit[] hits = searchResponse.getHits().getHits();
for(SearchHit hit:hits){
System.out.println("id: "+hit.getId()+" source: "+hit.getSourceAsString());
//获取高亮字段
Map<String, HighlightField> highlightFields = hit.getHighlightFields();
if(highlightFields.containsKey("description")){
System.out.println("description高亮结果： "+highlightFields.get("description").fragments()[0]);
}
if(highlightFields.containsKey("title")){
System.out.println("title高亮结果： "+highlightFields.get("title").fragments()[0]);
}
}
}
@Test //过滤查询
public void search4() throws IOException {
SearchRequest searchRequest = new SearchRequest("products");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.matchAllQuery())
.postFilter(QueryBuilders.idsQuery().addIds("1")); //指定过滤条件
searchRequest.source(searchSourceBuilder);//查询所有
//参数1：搜索请求对象 参数2：请求配置对象
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
System.out.println("查询出来的总条数："+searchResponse.getHits().getTotalHits().value);
System.out.println("查询出来的最大得分"+searchResponse.getHits().getMaxScore());
//拿到数据结果
SearchHit[] hits = searchResponse.getHits().getHits();
for(SearchHit hit:hits){
String id = hit.getId();
System.out.println("id: "+id+" source: "+hit.getSourceAsString());
}
}
}
