使用java访问elasticsearch创建索引
1、添加maven依赖

<dependency><groupId>org.elasticsearch</groupId><artifactId>elasticsearch</artifactId><version>0.90.0</version></dependency>

建议使用maven管理项目，因为elasticsearch还有很多依赖包，手工维护很麻烦
2、创建连接elasticsearch服务的client

Settings settings = ImmutableSettings.settingsBuilder().put("client.transport.sniff", true).put("cluster.name", "name of node").build();Client client = new TransportClient(settings).addTransportAddress(new InetSocketTransportAddress("ip of server", 9300));

3、创建索引
elasticsearch的java客户端，支持多种方式构建索引数据，这里有两种方式的代码示例：使用jsonbuilder构建数据

IndexResponse response = client.prepareIndex("comment_index", "comment_ugc", "comment_123674")    .setSource( XContentFactory.jsonBuilder()    .startObject()      .field("author", "569874")      .field("author_name", "riching")      .field("mark", 232)      .field("body", "北京不错，但是人太多了")      .field("createDate", "20130801175520")      .field("valid", true)    .endObject())    .setTTL(8000)    .execute().actionGet();System.out.println(response.getId());

另外一种，是把数据构造成json串，直接传给client

Student student = new Student(103161066, 20, "riching", "beijing");String jsonValue = mapper.writeValueAsString(student);response = client.prepareIndex("student_index", "student_info", "stu_103161066").setSource(jsonValue).execute().actionGet();System.out.println(response.getId());

实际应用中应该是下面一种更方便，可以把需要索引的对象直接扔过去了


4、根据id获取数据

GetResponse responseGet = client.prepareGet("comment_index", "comment_ugc",         "comment_123674").execute().actionGet();System.out.println(responseGet.getSourceAsString());

5、查询索引

SearchRequestBuilder builder = client.prepareSearch("comment_index").setTypes("comment_ugc").setSearchType(SearchType.DEFAULT).setFrom(0).setSize(100);BoolQueryBuilder qb = QueryBuilders.boolQuery().must(new   QueryStringQueryBuilder("北京").field("body"))    .should(new QueryStringQueryBuilder("太多").field("body"));builder.setQuery(qb);SearchResponse response = builder.execute().actionGet();System.out.println("  " + response);System.out.println(response.getHits().getTotalHits());

执行结果

{  "took" : 8,  "timed_out" : false,  "_shards" : {    "total" : 5,    "successful" : 5,    "failed" : 0  },  "hits" : {    "total" : 1,    "max_score" : 0.19178301,    "hits" : [ {      "_index" : "comment_index",      "_type" : "comment_ugc",      "_id" : "comment_123674",      "_score" : 0.19178301, "_source" : {"author":"569874","author_name":"riching","mark":232,"body":"北京不错，但是人太多了","createDate":"20130801175520","valid":true}    } ]  }}1

6、删除索引，可以根据索引id删除索引，也可以构造query进行删除，这跟lucene的api是类似的，只不过api不一样而已

DeleteResponse response = client.prepareDelete("comment_index", "comment_ugc", "comment_123674") .setOperationThreaded(false).execute().actionGet();System.out.println(response.getId());

这个删除有个小问题，如果删除完立即进行查询还是可以查到