elasticsearchjava开发

Posted 2021-03-24 ffzzblog

一、引入包

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>transport</artifactId>
    <version>6.2.4</version>
</dependency>

　

二、创建索引

    @Test
    public void creatIndex() throws UnknownHostException {
        //1、创建一个Setting对象，相当于是一个配置信息，主要配置集群的名称，
        Settings settings = Settings.builder()
                .put("cluster.name", "my-elasticsearch").build();

        //2、创建一个客户端client对象,内部通过tcp协议，所以使用93
        TransportClient client = new PreBuiltTransportClient(settings);
        client.addTransportAddress(new TransportAddress(InetAddress.getByName("127.0.0.1"),9301));
        client.addTransportAddress(new TransportAddress(InetAddress.getByName("127.0.0.1"),9301));
        client.addTransportAddress(new TransportAddress(InetAddress.getByName("127.0.0.1"),9303));
        //3、使用client对象创建一个索引
        client.admin().indices().prepareCreate("index_hello").get();
        //4、关闭client对象
        client.close();
    }

　　

三、创建mapping（创建一个Mappping信息，应该是一个json数据，可以是字符串，也可以是XContentBuilder对象）

    @Test
    public void creatMapping() throws IOException {
        TransportClient transportClient=ElasticSearchClientTest.creatClient();
        IndicesAdminClient  client= ElasticSearchClientTest.creatClient().admin().indices();
        client.prepareCreate("twitter")
                .setSettings(Settings.builder()
                        .put("index.number_of_shards", 5)
                        .put("index.number_of_replicas", 1)
                )
                .get();
       /* client.preparePutMapping("twitter").setType("user")
                .setSource("{
" +
                        "  "properties": {
" +
                        "    "name": {
" +
                        "      "type": "text"
" +
                        "    }
" +
                        "  }
" +
                        "}", XContentType.JSON)
                .get();*/
        XContentBuilder xc=XContentFactory.jsonBuilder();
        xc.startObject()
                            .startObject("properties")
                                .startObject("id")
                                    .field("type","long")
                                    .field("store",true)
                                .endObject()
                                .startObject("name")
                                    .field("type","text")
                                    .field("store",true)
                                    .field("index",true)
                                    .field("analyzer","ik_smart")
                                .endObject()
                                .startObject("content")
                                    .field("type","text")
                                    .field("store",true)
                                    .field("index",true)
                                    .field("analyzer","ik_smart")
                                .endObject()
                            .endObject()
                    .endObject();
        client.preparePutMapping("twitter").setType("article").setSource(xc).get();
        transportClient.close();
    }

　　

四、创建document

/**
     * 使用Map添加文档
     * IndexResponse response = client.prepareIndex("twitter", "tweet")
     *         .setSource(json, XContentType.JSON)
     *         .get();
     */
    @Test
    public void creatDocument() throws UnknownHostException {
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("id",100);
        map.put("name","cli_java");
        map.put("content","Map is a key:values pair collection. It represents a JSON structure分布式搜索elasticsearch配置文件详解 - 关于代码的那");

        TransportClient transportClient=ElasticSearchClientTest.creatClient();
        //IndicesAdminClient  client= ElasticSearchClientTest.creatClient().admin().indices();

　　　　　IndexResponse response=transportClient.prepareIndex("twitter", "article") .setSource(map, XContentType.JSON) .get(); 

　　　　　transportClient.close(); 
}

　　

五、查询

 

@Test
    public void getIndex() throws UnknownHostException,IOException {
        TransportClient transportClient=ElasticSearchClientTest.creatClient();
        //<!--索引库查询-根据id查询-->
        /*GetResponse response =transportClient.prepareGet("twitter","article","ER_Lpm4Bob3tI_qjogjc").get();
        Map<String,Object> map=response.getSource();
        System.out.println(map.get("content"));*/
        //<!--结束索引库查询-根据id查询-->
        //第二种创建一个查询对象
        IdsQueryBuilder queryBuilder=QueryBuilders.idsQuery().addIds("ER_Lpm4Bob3tI_qjogjc","Eh_gpm4Bob3tI_qjggjb");
        //执行查询
        SearchResponse searchResponse=transportClient.prepareSearch("twitter")
                .setTypes("article")
                .setQuery(queryBuilder)
                .get();
        SearchHits searchHits=searchResponse.getHits();
        Iterator<SearchHit> iterator= searchHits.iterator();
        while(iterator.hasNext()){
            SearchHit searchHit=iterator.next();
            System.out.println(searchHit.getSourceAsString());
            Map<String, Object> map=searchHit.getSourceAsMap();

            System.out.println(map.get("content"));
        }
        transportClient.close();
        //结束第二种方式创建查询对象

    }

　　

//条件查询
@Test
    public void getIndex() throws UnknownHostException,IOException {

        TermQueryBuilder qb=QueryBuilders.termQuery("name","cli_java");
        ElasticSearchClientTest.useTermGetIndex(qb);

    }

@Test
　　public void testQueryString() throws UnknownHostException {
   　　 QueryStringQueryBuilder qsq=QueryBuilders.queryStringQuery("独立寒秋，湘江北去,万里雪飘").defaultField("content");
   　　 ElasticSearchClientTest.useTermGetIndex(qsq);
　　}

private static void useTermGetIndex(TermQueryBuilder queryBuilder) throws UnknownHostException { 
　　　　TransportClient transportClient=ElasticSearchClientTest.creatClient(); 
　　　　//执行条件查询 
　　　　SearchResponse searchResponse=transportClient.prepareSearch("twitter")
　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　.setTypes("article") 
　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　.setQuery((org.elasticsearch.index.query.QueryBuilder) queryBuilder) 
　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　  //分页信息
　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　//.setFrom(start)
　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　//.setSize(pageSize)
　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　.get(); 

　　　　SearchHits searchHits=searchResponse.getHits(); 
　　　　Iterator<SearchHit> iterator= searchHits.iterator();
　　　　while(iterator.hasNext()){ 
　　　　　　SearchHit searchHit=iterator.next(); 
　　　　　　System.out.println(searchHit.getSourceAsString()); 
　　　　　　Map<String, Object> map=searchHit.getSourceAsMap(); 
　　　　　　System.out.println(map.get("content")); 
　　　　} 
　　　　transportClient.close(); 
}

　　

//高亮查询 
@Test
    public void testQueryFormSize() throws UnknownHostException {
        QueryStringQueryBuilder qsq=QueryBuilders.queryStringQuery("庆余年").defaultField("name");
        for(int i=1;i<111;i+=10){
            ElasticSearchClientTest.useTermGetIndex(qsq,i,10);
            System.out.println("-------------------------------------------------------------------");
        }
    }
    private static void useTermGetIndex(QueryStringQueryBuilder queryBuilder,int start,int pageSize) throws UnknownHostException {
        //高亮设置
        HighlightBuilder hb=new HighlightBuilder();
        hb.field("name");
        hb.preTags("<em>");
        hb.postTags("</em>");
        TransportClient transportClient=ElasticSearchClientTest.creatClient();
        //第二种创建一个查询对象
        //执行查询
        SearchResponse searchResponse=transportClient.prepareSearch("twitter")
                .setTypes("article")
                .setQuery((org.elasticsearch.index.query.QueryBuilder) queryBuilder)
                //分页信息
                .setFrom(start)
                .setSize(pageSize)
                //高亮查询
                .highlighter(hb)
                .get();
        SearchHits searchHits=searchResponse.getHits();
        Iterator<SearchHit> iterator= searchHits.iterator();
        while(iterator.hasNext()){
            SearchHit searchHit=iterator.next();
            System.out.println(searchHit.getSourceAsString());
            Map<String, Object> map=searchHit.getSourceAsMap();

            System.out.println(map.get("content"));
            System.out.println("**************************************************");
            Map<String, HighlightField> m=searchHit.getHighlightFields();
            System.out.println(m.get("name"));
        }