Elasticsearch的JavaAPI
获取客户端对象
public class App {
private TransportClient client;
//获取客户端对象
@Before
public void getClinet() throws UnknownHostException {
Settings settings = Settings.builder().put("cluster.name", "my-application").build();
//获得客户端对象
client = new PreBuiltTransportClient(settings);
client.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("192.168.1.11"), 9300));
System.out.println(client.toString());
}
## 创建索引
//创建索引
@Test
public void createIndex() {
client.admin().indices().prepareCreate("blog1").get();
client.close();
}
//删除索引
@Test
public void deleteIndex() {
client.admin().indices().prepareDelete("blog").get();
client.close();
}
新建文档
//新建文档
@Test
public void createIndexByJson() {
//创建文档内容
String json = "{" + "\"id\":\"1\"," + "\"title\":\"基于Lucene的搜索服务器\","
+ "\"content\":\"它提供了一个分布式多用户能力的全文搜索引擎，基于RESTful web接口\"" + "}";
//创建
IndexResponse response = client.prepareIndex("blog", "article", "1").setSource(json).execute().actionGet();
//打印返回值
System.out.println("索引" + response.getIndex());
System.out.println("类型" + response.getType());
System.out.println("id" + response.getId());
System.out.println("结果" + response.getResult());
client.close();
}
//创建文档以hashmap
@Test
public void createIndexBymap() {
HashMap<String, Object> json = new HashMap<String, Object>();
json.put("id", "2");
json.put("title", "hph");
json.put("content", "博客 hph.blog");
IndexResponse response = client.prepareIndex("blog", "article", "2").setSource(json).execute().actionGet();
//打印返回值
System.out.println("索引" + response.getIndex());
System.out.println("类型" + response.getType());
System.out.println("id" + response.getId());
System.out.println("结果" + response.getResult());
client.close();
}
//创建文档以hashmap
@Test
public void createIndexBymap() {
HashMap<String, Object> json = new HashMap<String, Object>();
json.put("id", "2");
json.put("title", "hph");
json.put("content", "博客 hph.blog");
IndexResponse response = client.prepareIndex("blog", "article", "2").setSource(json).execute().actionGet();
//打印返回值
System.out.println("索引" + response.getIndex());
System.out.println("类型" + response.getType());
System.out.println("id" + response.getId());
System.out.println("结果" + response.getResult());
client.close();
}
//创建文档已bulder
@Test
public void createIndexbyBulider() throws IOException {
XContentBuilder builder = XContentFactory.jsonBuilder().startObject().field("id", "4").field("title", "博客").field("content", "hphblog.cn").endObject();
IndexResponse response = client.prepareIndex("blog", "article", "3").setSource(builder).execute().actionGet();
//打印返回值
System.out.println("索引" + response.getIndex());
System.out.println("类型" + response.getType());
System.out.println("id" + response.getId());
System.out.println("结果" + response.getResult());
client.close();
}
查询索引
//单个索引查询
@Test
public void queryIndex() {
//查询
GetResponse response = client.prepareGet("blog", "article", "2").get();
//打印
System.out.println(response.getSourceAsString());
//关闭资源
client.close();
}
//多个索引查询
@Test
public void queryMultiIndex() {
//查询
MultiGetResponse response = client.prepareMultiGet().add("blog", "article", "3")
.add("blog", "article", "1")
.add("blog", "article", "2").get();
for (MultiGetItemResponse multiGetItemResponse : response) {
GetResponse response1 = multiGetItemResponse.getResponse();
//判断是否存在
if (response1.isExists()) {
System.out.println(response1.getSourceAsString());
}
}
}
//更改数据
@Test
public void update() throws ExecutionException, InterruptedException, IOException {
UpdateRequest updateRequest = new UpdateRequest("blog", "article", "2");
updateRequest.doc(XContentFactory.jsonBuilder().startObject().field("id", "2")
.field("title", "hphblog").field("content", "大数据博客学习技术分享").endObject()
);
UpdateResponse response = client.update(updateRequest).get();
//打印返回值
System.out.println("索引" + response.getIndex());
System.out.println("类型" + response.getType());
System.out.println("id" + response.getId());
System.out.println("结果" + response.getResult());
client.close();
}
更新文档
//更新文档updaset
@Test
public void upsert() throws IOException, ExecutionException, InterruptedException {
//没有就创建
IndexRequest indexRequest = new IndexRequest("blog", "article", "5");
indexRequest.source(XContentFactory.jsonBuilder().startObject().field("id", "5")
.field("title", "大数据技术分享的学习").field("content", "大数据技术的分享与学习希望和大家多多交流").endObject
());
//有文档内容就更新
UpdateRequest updateRequest = new UpdateRequest("blog", "article", "5");
updateRequest.doc(XContentFactory.jsonBuilder().startObject().field("id", "5")
.field("title", "hphblog").field("content", "技术分享、技术交流、技术学习").endObject()
);
updateRequest.upsert(indexRequest);
UpdateResponse response = client.update(updateRequest).get();
//打印返回值
System.out.println("索引" + response.getIndex());
System.out.println("类型" + response.getType());
System.out.println("id" + response.getId());
System.out.println("结果" + response.getResult());
client.close();
}
删除文档
//删除文档
@Test
public void delete() {
client.prepareDelete("blog", "article", "5").get();
client.close();
}
查询所有
//查询所有
@Test
public void matchAllquery() {
//1.执行查询
SearchResponse response = client.prepareSearch("blog").setTypes("article").setQuery(QueryBuilders.matchAllQuery()).get();
SearchHits hits = response.getHits();
System.out.println("查询的结果为" + hits.getTotalHits());
Iterator<SearchHit> iterator = hits.iterator();
while (iterator.hasNext()) {
SearchHit next = iterator.next();
System.out.println(next.getSourceAsString());
}
client.close();
}
//分词查询
@Test
public void query() {
//1.执行查询
SearchResponse response = client.prepareSearch("blog").setTypes("article").setQuery(QueryBuilders.queryStringQuery("学习全文")).get();
SearchHits hits = response.getHits();
System.out.println("查询的结果为" + hits.getTotalHits());
Iterator<SearchHit> iterator = hits.iterator();
while (iterator.hasNext()) {
SearchHit next = iterator.next();
System.out.println(next.getSourceAsString());
}
client.close();
}
通配符查询
//通配符查询
@Test
public void wildcardQuery() {
//1.执行查询
SearchResponse response = client.prepareSearch("blog").setTypes("article").setQuery(QueryBuilders.wildcardQuery("content", "分")).get();
SearchHits hits = response.getHits();
System.out.println("查询的结果为" + hits.getTotalHits());
Iterator<SearchHit> iterator = hits.iterator();
while (iterator.hasNext()) {
SearchHit next = iterator.next();
System.out.println(next.getSourceAsString());
}
client.close();
}
模糊查询
//模糊查询
@Test
public void fuzzyQuery() {
//1.执行查询
SearchResponse response = client.prepareSearch("blog").setTypes("article").setQuery(QueryBuilders.fuzzyQuery("title", "LuceNe")).get();
SearchHits hits = response.getHits();
System.out.println("查询的结果为" + hits.getTotalHits());
Iterator<SearchHit> iterator = hits.iterator();
while (iterator.hasNext()) {
SearchHit next = iterator.next();
System.out.println(next.getSourceAsString());
}
client.close();
}
//映射相关的操作
@Test
public void createMapping() throws Exception {
// 1设置mapping
XContentBuilder builder = XContentFactory.jsonBuilder()
.startObject()
.startObject("article")
.startObject("properties")
.startObject("id1")
.field("type", "string")
.field("store", "yes")
.endObject()
.startObject("title2")
.field("type", "string")
.field("store", "no")
.endObject()
.startObject("content")
.field("type", "string")
.field("store", "yes")
.endObject()
.endObject()
.endObject()
.endObject();
添加mapping
// 2 添加mapping
PutMappingRequest mapping = Requests.putMappingRequest("blog1").type("article").source(builder);
client.admin().indices().putMapping(mapping).get();
// 3 关闭资源
client.close();
}
原文：http://hphblog.cn/2018/12/16/Elasticsearch%E7%9A%84JavaAPI/
