📁 前情提要：
目录
[一、Springboot 整合 Elasticsearch](#一、Springboot 整合 Elasticsearch)
[1、RestHighLevelClient API介绍](#1、RestHighLevelClient API介绍)
[1.1、全查询 & 分页 & 排序](#1.1、全查询 & 分页 & 排序)
一、Springboot 整合 Elasticsearch
1、RestHighLevelClient API介绍
目前的测试数据有：
1.1、全查询 & 分页 & 排序
java
@Test
public void queryAllDoc() {
try {
String indexName = "forest";
SearchRequest request = new SearchRequest();
request.indices(indexName);
// 构建查询的请求体
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
sourceBuilder.query(QueryBuilders.matchAllQuery());
// 设置分页
sourceBuilder.from(1);
sourceBuilder.size(3);
// 设置排序
sourceBuilder.sort("price", SortOrder.DESC);
request.source(sourceBuilder);
SearchResponse search = esConfig.restHighLevelClient().search(request, RequestOptions.DEFAULT);
if (200 != search.status().getStatus()) {
log.error("查询失败");
}
System.out.println("--------查询结果-----------");
SearchHits hits = search.getHits();
for (SearchHit hit : hits) {
System.out.println(hit.getSourceAsString());
}
} catch (IOException e) {
e.printStackTrace();
}
}
1.2、单条件查询
1.2.1、termQuery
term属于精确匹配，而且只能查单个词（一个汉字或者一个英文单词），不会对用户输入的内容进行分词；
java
@Test
public void queryDocByKey() {
try {
String indexName = "forest";
SearchRequest request = new SearchRequest();
request.indices(indexName);
// 构建查询的请求体
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
sourceBuilder.query(QueryBuilders.termQuery("price", "300"));
request.source(sourceBuilder);
SearchResponse search = esConfig.restHighLevelClient().search(request, RequestOptions.DEFAULT);
if (200 != search.status().getStatus()) {
log.error("查询失败");
}
System.out.println("--------查询结果-----------");
SearchHits hits = search.getHits();
for (SearchHit hit : hits) {
System.out.println(hit.getSourceAsString());
}
} catch (IOException e) {
e.printStackTrace();
}
}
1.2.2、matchQuery
match进行搜索的时候，会先进行分词拆分，拆完后，再来匹配；例如输入"枫树"，match会拆分成"枫"，"树"两个字，只要包含其中一个字的都会被查出来。
java
@Test
public void queryDocByKey() {
try {
String indexName = "forest";
SearchRequest request = new SearchRequest();
request.indices(indexName);
// 构建查询的请求体
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
sourceBuilder.query(QueryBuilders.matchQuery("title", "枫树"));
request.source(sourceBuilder);
SearchResponse search = esConfig.restHighLevelClient().search(request, RequestOptions.DEFAULT);
if (200 != search.status().getStatus()) {
log.error("查询失败");
}
System.out.println("--------查询结果-----------");
SearchHits hits = search.getHits();
for (SearchHit hit : hits) {
System.out.println(hit.getSourceAsString());
}
} catch (IOException e) {
e.printStackTrace();
}
}
1.2.3、短语检索
要求所有的分词必须同时出现在文档中，同时位置必须紧邻一致
java
@Test
public void queryDocByPhraseKey() {
try {
String indexName = "forest";
SearchRequest request = new SearchRequest();
request.indices(indexName);
// 构建查询的请求体
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
sourceBuilder.query(QueryBuilders.matchPhraseQuery("title", "枫树"));
request.source(sourceBuilder);
SearchResponse search = esConfig.restHighLevelClient().search(request, RequestOptions.DEFAULT);
if (200 != search.status().getStatus()) {
log.error("查询失败");
}
System.out.println("--------查询结果-----------");
SearchHits hits = search.getHits();
for (SearchHit hit : hits) {
System.out.println(hit.getSourceAsString());
}
} catch (IOException e) {
e.printStackTrace();
}
}
1.3、组合查询
- must：返回的文档必须满足must子句的条件,并且参与计算分值；
- mustNot：返回的文档必须不满足定义的条件；
- should：在一个bool查询中，如果没有must或者filter，有一个或者多个should子句，那么只要满足一个就可以返回；
- filter：返回的文档必须满足filter子句的条件，但是不会像must一样，参与计算分值；
java
@Test
public void queryByCombinationKey() {
try {
// 声明搜索条件对象
String indexName = "forest";
SearchRequest request = new SearchRequest();
request.indices(indexName);
// 构建查询的请求体
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
boolQueryBuilder.must(QueryBuilders.matchQuery("price", 1000));
boolQueryBuilder.should(QueryBuilders.matchQuery("id", 3));
sourceBuilder.query(boolQueryBuilder);
request.source(sourceBuilder);
SearchResponse search = esConfig.restHighLevelClient().search(request, RequestOptions.DEFAULT);
if (200 != search.status().getStatus()) {
log.error("查询失败");
}
System.out.println("--------查询结果-----------");
SearchHits hits = search.getHits();
for (SearchHit hit : hits) {
System.out.println(hit.getSourceAsString());
}
} catch (IOException e) {
e.printStackTrace();
}
}
**注：**当使用should查询时，如果包含了must或者filter查询，那么should的查询语句就不是或者的意思了,而是有或者没有都行的含义。
1.4、范围查询
- **闭区间查询：**QueryBuilders.rangeQuery("{fieldName}").from({fieldValue1}).to(${fieldValue2});
- **开区间查询：**QueryBuilders.rangeQuery("{fieldName}").from({fieldValue1}, false).to(${fieldValue2}, false);
- **大于：**QueryBuilders.rangeQuery("{fieldName}").gt({fieldValue});
- **大于等于：**QueryBuilders.rangeQuery("{fieldName}").gte({fieldValue});
- **小于：**QueryBuilders.rangeQuery("{fieldName}").lt({fieldValue});
- **小于等于：**QueryBuilders.rangeQuery("{fieldName}").lte({fieldValue});
java
@Test
public void queryByCombinationKey() {
try {
// 声明搜索条件对象
String indexName = "forest";
SearchRequest request = new SearchRequest();
request.indices(indexName);
// 构建查询的请求体
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
boolQueryBuilder.must(QueryBuilders.rangeQuery("price").from(300).to(500));
boolQueryBuilder.must(QueryBuilders.rangeQuery("inventory").from(500).to(1000));
sourceBuilder.query(boolQueryBuilder);
request.source(sourceBuilder);
SearchResponse search = esConfig.restHighLevelClient().search(request, RequestOptions.DEFAULT);
if (200 != search.status().getStatus()) {
log.error("查询失败");
}
System.out.println("--------查询结果-----------");
SearchHits hits = search.getHits();
for (SearchHit hit : hits) {
System.out.println(hit.getSourceAsString());
}
} catch (IOException e) {
e.printStackTrace();
}
}
1.5、模糊查询
java
@Test
public void queryFuzzyDocByKey() {
try {
String indexName = "forest";
SearchRequest request = new SearchRequest();
request.indices(indexName);
// 构建查询的请求体
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
sourceBuilder.query(QueryBuilders.fuzzyQuery("title", "松").fuzziness(Fuzziness.AUTO));
request.source(sourceBuilder);
SearchResponse search = esConfig.restHighLevelClient().search(request, RequestOptions.DEFAULT);
if (200 != search.status().getStatus()) {
log.error("查询失败");
}
System.out.println("--------查询结果-----------");
SearchHits hits = search.getHits();
for (SearchHit hit : hits) {
System.out.println(hit.getSourceAsString());
}
} catch (IOException e) {
e.printStackTrace();
}
}
1.6、分组查询
按价格分组后求每组的条数
java
@Test
public void queryGroupByKey() {
try {
// 声明搜索条件对象
String indexName = "forest";
SearchRequest request = new SearchRequest();
request.indices(indexName);
// 构建查询的请求体
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
sourceBuilder.aggregation(AggregationBuilders.terms("price_groupBy").field("price"));
request.source(sourceBuilder);
SearchResponse search = esConfig.restHighLevelClient().search(request, RequestOptions.DEFAULT);
if (200 != search.status().getStatus()) {
log.error("查询失败");
}
List<KeyAndCount> list = new ArrayList<>();
System.out.println("--------查询结果-----------");
Terms terms = search.getAggregations().get("price_groupBy");
List<? extends Terms.Bucket> buckets = terms.getBuckets();
for (Terms.Bucket bucket : buckets) {
KeyAndCount keyAndCount = new KeyAndCount();
keyAndCount.setKey(bucket.getKey().toString());
keyAndCount.setCount(bucket.getDocCount());
list.add(keyAndCount);
System.out.println(keyAndCount);
}
} catch (IOException e) {
e.printStackTrace();
}
}
