java用es实现输入拼音的模糊搜索

首先，需要在Java中连接到Elasticsearch。可以使用Elasticsearch的Java客户端API进行连接。以下是一个简单的示例：

RestHighLevelClient client = new RestHighLevelClient(
        RestClient.builder(
                new HttpHost("localhost", 9200, "http")));

此代码创建一个连接到本地主机上端口为9200的Elasticsearch实例的客户端。

接下来，需要构建一个Elasticsearch查询，以便进行模糊搜索。以下是一个示例查询：

QueryBuilder query = QueryBuilders
        .matchQuery("name", "pingyin")
        .fuzziness(Fuzziness.AUTO);

此代码创建一个名为“name”的字段的模糊匹配查询，查询字符串为“pingyin”，并使用自动模糊度。

最后，可以使用查询执行器执行查询并获取结果。以下是一个示例代码：

SearchRequest searchRequest = new SearchRequest("my-index");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(query);
searchRequest.source(searchSourceBuilder);

SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
SearchHits hits = searchResponse.getHits();

for (SearchHit hit : hits) {
    String name = hit.getSourceAsMap().get("name").toString();
    System.out.println(name);
}

此代码执行查询并打印匹配的文档名称。

完整的示例代码如下：

RestHighLevelClient client = new RestHighLevelClient(
        RestClient.builder(
                new HttpHost("localhost", 9200, "http")));

QueryBuilder query = QueryBuilders
        .matchQuery("name", "pingyin")
        .fuzziness(Fuzziness.AUTO);

SearchRequest searchRequest = new SearchRequest("my-index");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(query);
searchRequest.source(searchSourceBuilder);

SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
SearchHits hits = searchResponse.getHits();

for (SearchHit hit : hits) {
    String name = hit.getSourceAsMap().get("name").toString();
    System.out.println(name);
}

client.close();