elasticsearch 口水篇（3）java客户端 - Jest

elasticsearch有丰富的客户端，java客户端有Jest。其原文介绍如下：

Jest is a Java HTTP Rest client for ElasticSearch.It is actively developed and tested by Searchly.

A sample Java application using Jest can be found on GitHub  https://github.com/searchbox-io/java-jest-sample.

[http://www.searchly.com/documentation/developer-api-guide/java-jest/]

 

下面我们做一个很简单的实例，以下几个功能：

1）批量添加1000个user对象；

2）通过id进行查询；

3）通过name进行查询；

 

user对象定义：

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package  com.fox.c1;   import  io.searchbox.annotations.JestId;   /**   * @author huangfox   * @date 2014年1月22日 下午5:31:52   *   */ public  class  User {      @JestId      private  Long id;      private  String name;      private  int  age;        public  Long getId() {          return  id;      }        public  void  setId(Long id) {          this .id = id;      }        public  String getName() {          return  name;      }        public  void  setName(String name) {          this .name = name;      }        public  int  getAge() {          return  age;      }        public  void  setAge( int  age) {          this .age = age;      }   }

　　

简单实现一个工厂类，用来获得JestHttpClient，如下：

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package  com.fox.c1;   import  io.searchbox.client.JestClientFactory; import  io.searchbox.client.config.HttpClientConfig; import  io.searchbox.client.http.JestHttpClient;   /**   * @author huangfox   * @date 2014年1月22日 下午5:16:15   *   */ public  class  ESFactory {      private  static  JestHttpClient client;        private  ESFactory() {        }        public  synchronized  static  JestHttpClient getClient() {          if  (client ==  null ) {              JestClientFactory factory =  new  JestClientFactory();              factory.setHttpClientConfig( new  HttpClientConfig.Builder(                      "http://localhost:9200" ).multiThreaded( true ).build());              client = (JestHttpClient) factory.getObject();          }          return  client;      }        public  static  void  main(String[] args) {          JestHttpClient client = ESFactory.getClient();          System.out.println(client.getAsyncClient());          System.out.println(client.getServers());          client.shutdownClient();      } }

　　

测试类：

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package  com.fox.c1;   import  io.searchbox.client.JestResult; import  io.searchbox.client.http.JestHttpClient; import  io.searchbox.core.Get; import  io.searchbox.core.Index; import  io.searchbox.core.Search; import  io.searchbox.indices.CreateIndex; import  io.searchbox.indices.DeleteIndex;   import  java.io.IOException;   import  org.elasticsearch.index.query.QueryBuilders; import  org.elasticsearch.search.builder.SearchSourceBuilder;   /**   * @author huangfox   * @date 2014年1月22日 下午5:32:20   *   */ public  class  ESTest {        private  JestHttpClient client = ESFactory.getClient();        /**       * indexing       *       * @param indexName       */      public  void  index(String indexName) {          try  {              // drop              DeleteIndex dIndex =  new  DeleteIndex( new  DeleteIndex.Builder(                      indexName));              client.execute(dIndex);              // create              CreateIndex cIndex =  new  CreateIndex( new  CreateIndex.Builder(                      indexName));              client.execute(cIndex);              // add doc              for  ( int  i =  0 ; i <  1000 ; i++) {                    User user =  new  User();                  user.setId( new  Long(i));                  user.setName( "huang fox "  + i);                  user.setAge(i %  100 );                  Index index =  new  Index.Builder(user).index(indexName)                          .type(indexName).build();                  client.execute(index);              }              //              client.shutdownClient();          }  catch  (IOException e) {              e.printStackTrace();          }      }        /**       * getting by id       *       * @param indexName       * @param query       */      public  void  get(String indexName, String query) {          Get get =  new  Get.Builder(indexName, query).build();          try  {              JestResult rs = client.execute(get);              System.out.println(rs.getJsonString());              //              client.shutdownClient();          }  catch  (IOException e) {              e.printStackTrace();          }      }        /**       * query       *       * @param query       */      public  void  search(String query) {          SearchSourceBuilder searchSourceBuilder =  new  SearchSourceBuilder();          searchSourceBuilder.query(QueryBuilders.queryString(query));          searchSourceBuilder.field( "name" );          Search search =  new  Search.Builder(searchSourceBuilder.toString())                  .build();          try  {              JestResult rs = client.execute(search);              System.out.println(rs.getJsonString());              //              client.shutdownClient();          }  catch  (IOException e) {              e.printStackTrace();          }      }        public  static  void  main(String[] args) {          ESTest t =  new  ESTest();          String indexName =  "user" ;          // indexing          t.index(indexName);          // getting by id          t.get(indexName,  "2" );          // query          String query =  "fox" ;          t.search(query);      }   }

　　

index 批量添加建议使用bulk，效率高(减少通讯次数)：

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public  void  indexBulk(String indexName) {          try  {              // drop              DeleteIndex dIndex =  new  DeleteIndex( new  DeleteIndex.Builder(                      indexName));              client.execute(dIndex);              // create              CreateIndex cIndex =  new  CreateIndex( new  CreateIndex.Builder(                      indexName));              client.execute(cIndex);              // add doc              Bulk.Builder bulkBuilder =  new  Bulk.Builder();              for  ( int  i =  0 ; i <  1000 ; i++) {                    User user =  new  User();                  user.setId( new  Long(i));                  user.setName( "huang fox "  + i);                  user.setAge(i %  100 );                  Index index =  new  Index.Builder(user).index(indexName)                          .type(indexName).build();                  bulkBuilder.addAction(index);              }              client.execute(bulkBuilder.build());              //              client.shutdownClient();          }  catch  (IOException e) {              e.printStackTrace();          }      }

　　

 

 原文地址：http://www.cnblogs.com/huangfox/p/3542858.html