本文主要是介绍ElasticSearch Java API 增删改查操作,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
1.添加pom.xml依赖
API基本操作
2.连接到elasticsearch集群
private static TransportClient client;
static {// 1、获取客户端对象,设置连接的集群名称
Settings settings= Settings.builder().put("cluster.name","elasticsearch").build();
client=new PreBuiltTransportClient(settings);
// 2、连接集群
try {
client.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("hadoop-001"), 9300));
System.out.println(client.toString());
} catch (UnknownHostException e) {
e.printStackTrace();
}}
3.创建索引
public static void creatIndex(){
//1.创建索引(indices指数)
client.admin().indices().prepareCreate("blog").get();
//2.关闭连接
client.close();
}
4.删除索引
public static void deleteIndex(){
//1.创建索引(indices指数)
client.admin().indices().prepareDelete("blog").get();
//2.关闭连接
client.close();
}
5 新建文档(源数据是手写的 json 串)
public static void creatIndexByJason(){
// 1、文档数据准备
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\"" + "}";
String jason2="{"+ "\"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的全文搜索引擎,基于RESTful web接口\""+"}";
//2.创建文档
IndexResponse indexResponse=client.prepareIndex("blog","article","1").setSource(json).execute().actionGet();
// 3、打印返回的结果
System.out.println("index:" + indexResponse.getIndex());
System.out.println("type:" + indexResponse.getType());
System.out.println("id:" + indexResponse.getId());
System.out.println("version:" + indexResponse.getVersion());
System.out.println("result:" + indexResponse.getResult());
// 4、关闭连接
client.close();
}
6 新建文档(源数据是以 map 方式添加的键值对)
public static void creatIndexByMap(){
// 1、文档数据准备
Map
json.put("id", "2");
json.put("title", "基于Lucene的搜索服务器");
json.put("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");
IndexResponse indexResponse=client.prepareIndex("blog","article","2").setSource(json).execute().actionGet();
// 3、打印返回的结果
System.out.println("index:" + indexResponse.getIndex());
System.out.println("type:" + indexResponse.getType());
System.out.println("id:" + indexResponse.getId());
System.out.println("version:" + indexResponse.getVersion());
System.out.println("result:" + indexResponse.getResult());
// 4、关闭连接
client.close();
}
7 新建文档(源数据是通过 es 构建器构建的数据)
public static void creatIndexByBuilder() {
//1.通过es自带的帮助类,来构建json数据
XContentBuilder builder= null;
try {
builder = XContentFactory.jsonBuilder().startObject()
.field("id","3")
.field("title","基于Lucene的搜索服务器")
.field("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")
.endObject();
} catch (IOException e) {
e.printStackTrace();
}
IndexResponse indexResponse=client.prepareIndex("blog","article","3").setSource(builder).execute().actionGet();
// 3、打印返回的结果
System.out.println("index:" + indexResponse.getIndex());
System.out.println("type:" + indexResponse.getType());
System.out.println("id:" + indexResponse.getId());
System.out.println("version:" + indexResponse.getVersion());
System.out.println("result:" + indexResponse.getResult());
// 4、关闭连接
client.close();
}
8 搜索文档数据(单个索引)
public static void getData() {
// 1、查询文档
GetResponse response = client.prepareGet("blog", "article", "1").get();
// 2、打印搜索的结果
System.out.println(response.getSourceAsString());
// 3、关闭连接
client.close();
}
9 搜索文档数据(多个索引)
public static void getMultiData() {
// 1、查询多个文档
MultiGetResponse response = client.prepareMultiGet()
.add("blog", "article", "1")
.add("blog", "article", "2", "3")
.add("blog", "article", "2").get();
// 2、遍历返回的结果
for (MultiGetItemResponse itemResponse : response) {
GetResponse getResponse = itemResponse.getResponse();
// 如果获取到查询结果
if (getResponse.isExists()) {
String sourceAsString = getResponse.getSourceAsString();
System.out.println(sourceAsString);
}
}
// 3、关闭资源
client.close();
}
10 更新文档数据(update)
public static void updateData() {
// 1、创建更新数据的请求对象
UpdateRequest updateRequest = new UpdateRequest();
updateRequest.index("blog");
updateRequest.type("article");
updateRequest.id("3");
try {
updateRequest.doc(XContentFactory.jsonBuilder().startObject()
.field("title", "基于Lucene的搜索服务器") // 对没有的字段进行添加,对已有的字段进行替换
.field("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。大数据前景无限")
.field("createDate", "2017-8-22").endObject());
} catch (IOException e) {
e.printStackTrace();
}
// 2、获取更新后的值
UpdateResponse indexResponse = null;
try {
indexResponse = client.update(updateRequest).get();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
// 3、打印返回的结果
System.out.println("index:" + indexResponse.getIndex());
System.out.println("type:" + indexResponse.getType());
System.out.println("id:" + indexResponse.getId());
System.out.println("version:" + indexResponse.getVersion());
System.out.println("result:" + indexResponse.getResult());
// 4、关闭连接
client.close();
}
11 更新文档数据(upsert)
public static void upsertData() throws Exception {
// 设置查询条件,查找不到则添加 IndexRequest 内容
IndexRequest indexRequest = new IndexRequest("blog", "article", "5")
.source(XContentFactory.jsonBuilder().startObject()
.field("title", "搜索服务器")
.field("content","Elasticsearch是用Java开发的,并作为Apache许可条款下的开放源码发布,是当前流行的企业级搜索引擎。").endObject());
// 设置更新,查找到则按照 UpdateRequest 更新
UpdateRequest upsert = new UpdateRequest("blog", "article", "5")
.doc(XContentFactory.jsonBuilder().startObject().field("user", "李四").endObject()).upsert(indexRequest);
client.update(upsert).get();
client.close();
}
12 删除文档数据(prepareDelete)
public static void deleteData() {
// 1、删除文档数据
DeleteResponse indexResponse = client.prepareDelete("blog", "article", "2").get();
// 2、打印返回的结果
System.out.println("index:" + indexResponse.getIndex());
System.out.println("type:" + indexResponse.getType());
System.out.println("id:" + indexResponse.getId());
System.out.println("version:" + indexResponse.getVersion());
System.out.println("result:" + indexResponse.getResult());
// 3、关闭连接
client.close();
}
条件查询
1 查询所有(matchAllQuery)
public static void matchAllQuery(){
//1.执行查询(查询所有)
SearchResponse searchResponse=client.prepareSearch("blog").setTypes("article")
.setQuery(QueryBuilders.matchAllQuery()).get();
// 2、打印查询结果
SearchHits hits=searchResponse.getHits();//获取命中数,查询结果有多少对象
System.out.println("查询结果一共有"+hits.totalHits+"条");
for (SearchHit hit : hits) {
System.out.println(hit.getSourceAsString());
}
}
2 对所有字段分词查询(queryStringQuery)
public static void queryStringQuery() {
// 1、条件查询(对所有字段分词查询)
SearchResponse searchResponse = client.prepareSearch("blog").setTypes("article")
.setQuery(QueryBuilders.queryStringQuery("全文")).get();
// 2、打印查询结果
SearchHits hits = searchResponse.getHits(); // 获取命中次数,查询结果有多少对象
System.out.println("查询结果有:" + hits.getTotalHits() + "条");
Iterator
while (iterator.hasNext()) {
SearchHit searchHit = iterator.next(); // 每个查询对象
System.out.println(searchHit.getSourceAsString()); // 获取字符串格式打印
}
// 3、关闭连接
client.close();
}
3 通配符查询(wildcardQuery)
public static void wildcardQuery() {
// 1、通配符查询
SearchResponse searchResponse = client.prepareSearch("blog").setTypes("article")
.setQuery(QueryBuilders.wildcardQuery("content", "*全*")).get();
// 2、打印查询结果
SearchHits hits = searchResponse.getHits(); // 获取命中次数,查询结果有多少对象
System.out.println("查询结果有:" + hits.getTotalHits() + "条");
Iterator
while (iterator.hasNext()) {
SearchHit searchHit = iterator.next(); // 每个查询对象
System.out.println(searchHit.getSourceAsString()); // 获取字符串格式打印
}
// 3、关闭连接
client.close();
}
4 词条查询(TermQuery)
public static void termQuery() {
// 1、词条查询
SearchResponse searchResponse = client.prepareSearch("blog").setTypes("article")
.setQuery(QueryBuilders.termQuery("content", "全")).get(); // 因为没有使用 IK 分词器,所有只能一个字一个字的查
// 2、打印查询结果
SearchHits hits = searchResponse.getHits(); // 获取命中次数,查询结果有多少对象
System.out.println("查询结果有:" + hits.getTotalHits() + "条");
Iterator
while (iterator.hasNext()) {
SearchHit searchHit = iterator.next(); // 每个查询对象
System.out.println(searchHit.getSourceAsString()); // 获取字符串格式打印
}
// 3、关闭连接
client.close();
}
5 模糊查询(fuzzy)
public static void fuzzyQuery() {
// 1、模糊查询
SearchResponse searchResponse = client.prepareSearch("blog").setTypes("article")
.setQuery(QueryBuilders.fuzzyQuery("title", "lucene")).get();
// 2、打印查询结果
SearchHits hits = searchResponse.getHits(); // 获取命中次数,查询结果有多少对象
System.out.println("查询结果有:" + hits.getTotalHits() + "条");
Iterator
while (iterator.hasNext()) {
SearchHit searchHit = iterator.next(); // 每个查询对象
System.out.println(searchHit.getSourceAsString()); // 获取字符串格式打印
}
// 3、关闭连接
client.close();
}
映射相关操作
public static void createMapping() throws Exception {
// 1、创建索引(indices 指数)
//client.admin().indices().prepareCreate("blog2").get();
// 1、设置 mapping
XContentBuilder builder = XContentFactory.jsonBuilder()
.startObject()
.startObject("article2")
.startObject("properties")
.startObject("id2")
.field("type", "text")
.field("store", "true")
.endObject()
.startObject("title2")
.field("type", "text")
.field("store", "false")
.endObject()
.startObject("content2")
.field("type", "text")
.field("store", "true")
.endObject()
.endObject()
.endObject()
.endObject();
// 2、添加 mapping
PutMappingRequest mapping = Requests.putMappingRequest("blog2").type("article2").source(builder);
client.admin().indices().putMapping(mapping).get();
// 3、关闭资源
client.close();
}
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