elasticsearch入门（二 基础api实例）

本人目前使用的版本是2.0.0

 

client 

基础代码如下

Settings settings = Settings.settingsBuilder().put("cluster.name","jiangnan_cluster").put("client.transport.sniff", true).build();
try {
    ElasticClient client = TransportClient.builder().settings(settings).build()
            .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("172.24.3.95"), 9300))
            .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("172.24.3.96"), 9300))
            .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("172.24.3.97"), 9300));
} catch (UnknownHostException e) {
    e.printStackTrace();
}

官网demo

https://www.elastic.co/guide/en/elasticsearch/client/java-api/2.0/transport-client.html

官网给的demo 并没有设置setting 的方式，使用后会有

None of the configured nodes are available 异常

 

create index

基础代码如下　

Map<String, Object> json = new HashMap<String, Object>();
        json.put("user","jn");
        json.put("postDate",new Date());
        json.put("message", "trying out Elasticsearch");
        IndexResponse response = client.prepareIndex("index", “type”, ”1")
                .setSource(json)
                .get();

 

如果 此处 id 不自己定义, es 会创建一个默认的随机码(还未细看具体实现)似的编码 如：AVRCKiIlXmm1GX2hHZvw

官网demo

https://www.elastic.co/guide/en/elasticsearch/client/java-api/2.0/java-docs-index.html

 

get index

基础代码如下

GetResponse response = client.prepareGet("index", "type", "1")
                .setOperationThreaded(false)
                .get();
        System.out.println(response.getSourceAsString());　

注：setOperationThreaded 

operationthreaded 默认为 true，此处显示的设置为false 代表 非多线程模式

官网demo

https://www.elastic.co/guide/en/elasticsearch/client/java-api/2.0/java-docs-get.html

 

delete index  同 get index

官网demo

https://www.elastic.co/guide/en/elasticsearch/client/java-api/2.0/java-docs-delete.html

 

update index

基础代码如下

Map<String, Object> json = new HashMap<String, Object>();
        json.put("id","ss");
        json.put("user","jbbcn");
        json.put("postDate",new Date());
        json.put("message", "trying out Elasticsearch");
        try {
            UpdateRequest request = new UpdateRequest("index","type","1")
                    .doc(jsonBuilder().startObject().field("user", "zy").endObject());
            UpdateResponse response = client.update(request).get();
            System.out.println(response.getVersion());
        } catch (IOException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }

　　

        　　

官网demo

https://www.elastic.co/guide/en/elasticsearch/client/java-api/2.0/java-docs-update.html

 

bulk

基础代码如下

BulkRequestBuilder request = client.prepareBulk();
        BulkResponse response = null;
        try {
            response = request
                    .add(client.prepareIndex("index", "type", "2")
                            .setSource(jsonBuilder().startObject().field("user", "jn5").endObject()))
                    .add(client.prepareIndex("index", "type", "3")
                            .setSource(jsonBuilder().startObject().field("user", "jn3").endObject()))
                    .add(client.prepareDelete("index","type","3"))
                    .get();
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println(response.toString());

　　

此处作用是将多个操作合并为一个request 操作

官网demo

https://www.elastic.co/guide/en/elasticsearch/client/java-api/2.0/java-docs-bulk.html

 

search index

基础代码如下

SearchResponse response = client.prepareSearch("index")
                .setTypes("type")
                .setSearchType(SearchType.DFS_QUERY_THEN_FETCH)
                .setQuery(QueryBuilders.termQuery("message","out"))
                .setPostFilter(QueryBuilders.existsQuery("id”))//只获取包含 id field 的 结果
                .setFrom(0).setSize(10).setExplain(true)
                .execute()
                .actionGet();
        SearchHits searchHits = response.getHits();
        System.out.println(searchHits.hits().length);
        for(SearchHit hitFields:searchHits.getHits()){
            System.out.println(hitFields.getSource().toString());
        }

        System.out.println(response.getHits().toString());
//        获取所有数据
//        SearchResponse response = client.prepareSearch().execute().actionGet();

　　

官网demo

https://www.elastic.co/guide/en/elasticsearch/client/java-api/2.0/java-search.html