Java中使用elasticsearch搜索引擎实现简单查询、修改等操作-已在项目中实际应用

以下的操作环境为：jdk：1.8；elasticsearch：5.2.0

maven架包下载坐标为：

<dependency>
    <groupId>org.elasticsearch.plugin</groupId>
    <artifactId>transport-netty4-client</artifactId>
    <version>5.2.0</version>
</dependency>
<dependency>
    <groupId>org.elasticsearch</groupId>
    <artifactId>elasticsearch</artifactId>
    <version>5.2.0</version>
</dependency>
<dependency>
    <groupId>org.nlpcn</groupId>
    <artifactId>elasticsearch-sql</artifactId>
    <version>6.3.0.0</version>
</dependency>
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.9</version>
</dependency>
<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>transport</artifactId>
    <version>5.2.0</version>
</dependency>

Java创建ES连接工具类：

//创建连接工具类
public class ESClientConnectionUtil {
    public static TransportClient client=null;
    public final static String HOST = "192.168.200.211"; //服务器部署
    public final static Integer PORT = 9301; //端口
public static TransportClient  getESClientConnection(){
    if (client == null) {
        System.setProperty("es.set.netty.runtime.available.processors", "false");
            try {
                //设置集群名称
                Settings settings = Settings.builder().put("cluster.name", "es5").put("client.transport.sniff", true).build();
                //创建client
                client = new PreBuiltTransportClient(settings).addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName(HOST), PORT));
            } catch (Exception ex) {
                ex.printStackTrace();
                System.out.println(ex.getMessage());
        }
    }
    return client;
}
 
}

用Java命令想elasticsearch中插入数据

public Map<String,Object> addTopic(KnowledgeTopicDTO knowledgeTopicDTO){
    Map<String,Object> map = new HashMap<>();
 //连接ES
    TransportClient transportClient =  ESClientConnectionUtil.getESClientConnection();
    JSONObject json = JSONObject.fromObject(knowledgeTopicDTO);//后台传过来的对象数据转换成json格式
    try{
        //index 索引名称（相当于数据库） type :类型（相当于数据库中的表）
        IndexResponse response = transportClient.prepareIndex("knowledge", "knowledge_theme").setSource(json, XContentType.JSON).get();
        if(null !=response.getId()){
            map.put("code",200);
            return map;
        }
    }catch (Exception e){
        e.printStackTrace();
        map.put("code",500);
        return map;
    }
    return null;
}

使用Java根据id查询数据

//连接ES
    TransportClient transportClient =  ESClientConnectionUtil.getESClientConnection();
//参数：索引名，类型（type） id
GetResponse response = client.prepareGet("knowledge", "knowledge_theme", "1")
        .setOperationThreaded(false)    // 线程安全
        .get();

JSONObject obj = new JSONObject().fromObject(response.getSourceAsString());//将json字符串转换为json对象
InformationDTO information = (InformationDTO) JSONObject.toBean(obj, InformationDTO.class);//将json数据转换成InformationDTO实体对象
String codes =response.getId();//获取_id

根据id进行修改数据（传入对象）

//knowledgeTopic为修改数据的对象
//修改状态后的对象转换成json数据
JSONObject fromObject= JSONObject.fromObject(knowledgeTopic);
//参数：索引名，类型（type） id（指的是_id） 要修改的json数据：fromObject
UpdateResponse updateResponse = client.prepareUpdate("knowledge", "knowledge_theme", "1")
        .setDoc(fromObject).get();

根据id修改数据（针对单个字段修改）

   XContentBuilder source = null;
        try {
            source = XContentFactory.jsonBuilder()
                    .startObject()
                    .field("browseNum", num) //browseNum：要修改的字段名，num 修改的值
                    .endObject();
        } catch (IOException e) {
            e.printStackTrace();
        }
//client：ES连接  codes为文档的_id
        UpdateResponse updateResponse = client.prepareUpdate("article", "up_information", codes).setDoc(source).get();

　　

ES模糊查询

SearchResponse searchResponse=null;
//连接elasticsearch
TransportClient transportClient =  ESClientConnectionUtil.getESClientConnection();
searchResponse = client.prepareSearch()
                    .setIndices("knowledge")
                    .setTypes("knowledge_theme")
                     .setSearchType(SearchType.DFS_QUERY_THEN_FETCH)
                    .setScroll(TimeValue.timeValueMinutes(30)) //游标维持时间
                    .setSize(2 * 5)//实际返回的数量为10*index的主分片数
                     .setQuery(QueryBuilders.wildcardQuery("name", ("*"+name+"*").toLowerCase()))  //查询的字段名及值
                    .execute()
                    .actionGet();

以上功能本人已亲测过，都能实现，希望这对大家有所帮助！转发请说明出处，本人的博客地址为：https://www.cnblogs.com/chenyuanbo/

技术在于交流！