elasticsearch java API

1、连接elasticseach

public class ElasticSearchComponent {

    TransportClient client = null;

    public ESClientSettings() {
        Settings settings = ImmutableSettings.settingsBuilder()
                .put("client.transport.sniff", true).build();
        client = new TransportClient(settings);
    }

    public void connect() {
        client.addTransportAddress(new InetSocketTransportAddress("localhost", 9300));
    }

    public void close(){
        client.close();
    }

}

2、创建索引

1.1、方法1

public void createIndex(){
    try{
        String json = "{"title":"this","description":"descript","createDate":new Date()}";

        IndexResponse response = client.prepareIndex("test_index", "test_type")
                .setSource(json)
                .execute()
                .actionGet();
    }catch (Exception e){
        e.printStackTrace();
    }
}

1.2、方法2

public void createIndex() {
    try {
        XContentBuilder doc = XContentFactory.jsonBuilder()
                .startObject()
                .field("title", "this")
                .field("description", "descript")
                .field("createDate", new Date())
                .endObject();
        client.prepareIndex("product_index", "product_type", "1").setSource(doc).execute().actionGet();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

3、查询（索引(数据库)：animal_index，类型（表）：cat_type）

3.1、根据ID进行单个查询
GetResponse response = client.prepareGet("animal_index", "cat_type", "1")
                .setOperationThreaded(false)
                .get();


3.2、分页查询所有记录
QueryBuilder qb=new MatchAllQueryBuilder();
SearchResponse response= client.prepareSearch("animal_index").setTypes("cat_type").setQuery(qb).setFrom(0)
.setSize(100).get();
SearchHits searchHits = response.getHits();
for(SearchHit hit:searchHits.getHits()){
logger.log(Level.INFO , hit.getSourceAsString());
}
相当于查询关系型数据库：sql select * from animal_index.cat_type limit 100;


3.3、根据多条件组合与查询
QueryBuilder qb=QueryBuilders.boolQuery().must(QueryBuilders.termQuery("skin","yellow")).must(QueryBuilders.termQuery("age",2)) ;
SearchRequestBuilder sv=client.prepareSearch("animal_index").setTypes("cat_type").setQuery(qb).setFrom(0)
.setSize(100);
logger.log(Level.INFO,sv.toString());
SearchResponse response= sv.get();
SearchHits searchHits = response.getHits();
for(SearchHit hit:searchHits.getHits()){
logger.log(Level.INFO , hit.getSourceAsString());
}
相当于查询关系型数据库：select * from animal_index.cat_type where skin='yellow' and age=2


3.4、多条件或查询
QueryBuilder qb=QueryBuilders.termQuery("user","tom-1");
QueryBuilder qb1=QueryBuilders.termQuery("user","tom-2");
SortBuilder sortBuilder=SortBuilders.fieldSort("age");
sortBuilder.order(SortOrder.DESC);
QueryBuilder s=QueryBuilders.boolQuery().should(qb).should(qb1);//.must(qb5);
SearchRequestBuilder sv=client.prepareSearch("animal_index").setTypes("cat_type").setQuery(s).addSort(sortBuilder).setFrom(0)
.setSize(100);
logger.log(Level.INFO,sv.toString());
SearchResponse response= sv.get();
SearchHits searchHits = response.getHits();
for(SearchHit hit:searchHits.getHits()){
logger.log(Level.INFO , hit.getSourceAsString());
}
相当于查询关系型数据库：select * from animal_index.cat_type where user='tom-1' or  user='tom-2';


3.5、范围查询 
// RangeQueryBuilder rangeQueryBuilder = QueryBuilders.rangeQuery("age").from(30,true).to(30,true);
// RangeQueryBuilder rangeQueryBuilder = QueryBuilders.rangeQuery("age").gt(30 );
RangeQueryBuilder rangeQueryBuilder = QueryBuilders.rangeQuery("age").gte(30 );
QueryBuilder s=QueryBuilders.boolQuery().must(rangeQueryBuilder);//.must(qb5);
SearchRequestBuilder sv=client.prepareSearch("animal_index").setTypes("cat_type").setQuery(s).setFrom(0)
.setSize(100);
logger.log(Level.INFO,sv.toString());
SearchResponse response= sv.get();
SearchHits searchHits = response.getHits();
for(SearchHit hit:searchHits.getHits()){
logger.log(Level.INFO , hit.getSourceAsString());
}
相当于查询关系型数据库；select * from animal_index.cat_type where age >=30 and age<=30;


3.6、包含查询
List<String> strs=new ArrayList<>();
strs.add("tom-1");
strs.add("tom-2");
strs.add("tom-3");
QueryBuilder qb=QueryBuilders.termsQuery("user",strs);
SearchRequestBuilder sv=client.prepareSearch("animal_index").setTypes("cat_type").setQuery(qb).setFetchSource("age",null).setFrom(0)
.setSize(100);
logger.log(Level.INFO,sv.toString());
SearchResponse response= sv.get();
SearchHits searchHits = response.getHits();
for(SearchHit hit:searchHits.getHits()){
logger.log(Level.INFO , hit.getSourceAsString());
}
相当于查询关系型数据库；select age from animal_index.cat_type where user in ('tom-1','tom-2','tom-3');


3.7、专门按id进行的包含查询
QueryBuilder qb=QueryBuilders.idsQuery(1+"");
SearchRequestBuilder sv=client.prepareSearch("animal_index").setTypes("cat_type").setQuery(qb).setFetchSource("age",null).setFrom(0)
.setSize(100);
logger.log(Level.INFO,sv.toString());
SearchResponse response= sv.get();
SearchHits searchHits = response.getHits(); 
for(SearchHit hit:searchHits.getHits()){
logger.log(Level.INFO , hit.getSourceAsString());
}
相当于查询关系型数据库；select age from animal_index.cat_type where id in ('1');


3.8、按通配符查询
QueryBuilder qb = QueryBuilders.wildcardQuery("user", "t*m*");
//Fuzziness fuzziness=Fuzziness.fromEdits(2);
//QueryBuilder qb = QueryBuilders.fuzzyQuery("user","om").fuzziness(fuzziness);
//QueryBuilder qb = QueryBuilders.prefixQuery("user", "tom-2");
SearchRequestBuilder sv=client.prepareSearch("animal_index").setTypes("cat_type").setQuery(qb).setFetchSource("user",null).setFrom(0)
.setSize(100);
logger.log(Level.INFO,sv.toString());
SearchResponse response= sv.get();
SearchHits searchHits = response.getHits();
for(SearchHit hit:searchHits.getHits()){
logger.log(Level.INFO , hit.getSourceAsString());
}
通配符查询像我们sql里的like

3.8、match_parse查询
3.8.1、match_parse查询相当于结构化数据库模糊查询like 。
例子： "我是中学生" 伪代码match_parse("一个") 会对查询字符串分词[一，个]。同时需要有"一个"才会被搜索出来

3.8.2、match_parse与match区别
match查询只有包含"一"或者"个"或者"一个"都会被搜索出来。这是与match_parse比较大区别

4、修改

4.1、传入json字符串更新
public void testUpdate() {
        JSONObject json = new JSONObject();
        json.put("name", "李四");
        json.put("age", "20");
        json.put("sex", "男");
        json.put("grade", "高二");
        UpdateResponse response = client.prepareUpdate("stu_index", "stu_type", "id_000001").setDoc(json.toJSONString(), XContentType.JSON).get();
    }

5、删除索引数据

5.1、根据条件删除
public void delbyquery(){
QueryBuilder query = QueryBuilders.fieldQuery("type", "1");
     client.prepareDeleteByQuery("productindex").setQuery(query).execute().actionGet();
}

5.2、根据ID删除
public void delbyid(){
DeleteResponse response = client.prepareDelete("productindex", "productindex", "1") 
       .execute() 
       .actionGet();
}