java es 中文Api

实现“java es 中文Api”教程

一、整体流程

flowchart TD;
    A(准备环境) --> B(导入相关依赖);
    B --> C(创建索引);
    C --> D(设置Mapping);
    D --> E(插入数据);
    E --> F(搜索数据);

二、步骤与代码

1. 准备环境

在项目中引入Elasticsearch的Java客户端依赖包。

// maven依赖
<!--  -->
<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    <version>7.15.1</version>
</dependency>

2. 创建索引

使用RestHighLevelClient创建索引。

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

// 创建索引请求
CreateIndexRequest request = new CreateIndexRequest("index_name");

// 向Elasticsearch发送请求
CreateIndexResponse createIndexResponse = client.indices().create(request, RequestOptions.DEFAULT);

3. 设置Mapping

定义索引的Mapping，包括字段类型、分词器等。

// 创建Mapping
XContentBuilder builder = XContentFactory.jsonBuilder();
builder.startObject();
{
    builder.startObject("properties");
    {
        builder.startObject("title");
        {
            builder.field("type", "text");
            builder.field("analyzer", "ik_max_word");
        }
        builder.endObject();
    }
    builder.endObject();
}
builder.endObject();

PutMappingRequest mappingRequest = new PutMappingRequest("index_name");
mappingRequest.source(builder);

// 向Elasticsearch发送请求
client.indices().putMapping(mappingRequest, RequestOptions.DEFAULT);

4. 插入数据

向索引中插入数据。

// 创建索引请求
IndexRequest indexRequest = new IndexRequest("index_name");
indexRequest.id("1");
indexRequest.source("title", "中文测试数据");

// 向Elasticsearch发送请求
IndexResponse indexResponse = client.index(indexRequest, RequestOptions.DEFAULT);

5. 搜索数据

搜索包含特定关键词的数据。

// 创建搜索请求
SearchRequest searchRequest = new SearchRequest("index_name");
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
sourceBuilder.query(QueryBuilders.matchQuery("title", "中文"));

searchRequest.source(sourceBuilder);

// 向Elasticsearch发送请求
SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

三、类图

classDiagram
    class RestHighLevelClient {
        + RestHighLevelClient(builder: RestClientBuilder)
        + indices(): IndicesClient
        + index(indexRequest: IndexRequest, options: RequestOptions): IndexResponse
        + search(searchRequest: SearchRequest, options: RequestOptions): SearchResponse
    }
    class CreateIndexRequest
    class PutMappingRequest
    class IndexRequest
    class SearchRequest

通过以上步骤，你可以成功实现Java中文Api的使用。祝你学习顺利！