十一、ELASTICSEARCH JAVAAPI-文档管理

Product.java

 

准备 Product.java 用于存放数据

 

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package com.how2java;   public class Product {       int id;     String name;           public int getId() {         return id;     }       public void setId(int id) {         this.id = id;     }       public String getName() {         return name;     }       public void setName(String name) {         this.name = name;     }       @Override     public String toString() {         return "Product [id=" + id + ", name=" + name + "]";     }       }

TestElasticSearch4J

TestElasticSearch4J 提供了 Document的 CRUD一套，逻辑很清晰，请看注释

 

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package com.how2java;   import java.io.IOException; import java.util.HashMap; import java.util.Map;   import org.apache.http.HttpHost; import org.elasticsearch.ElasticsearchStatusException; import org.elasticsearch.action.admin.indices.create.CreateIndexRequest; import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequest; import org.elasticsearch.action.admin.indices.open.OpenIndexRequest; import org.elasticsearch.action.delete.DeleteRequest; import org.elasticsearch.action.get.GetRequest; import org.elasticsearch.action.get.GetResponse; import org.elasticsearch.action.index.IndexRequest; import org.elasticsearch.action.update.UpdateRequest; import org.elasticsearch.client.RestClient; import org.elasticsearch.client.RestHighLevelClient;   public class TestElasticSearch4J {     private static RestHighLevelClient client = new RestHighLevelClient(             RestClient.builder(                     new HttpHost("localhost", 9200, "http")             ));     private static String indexName = "how2java";           public static void main(String[] args) throws IOException {         //确保索引存在         if(!checkExistIndex(indexName)){             createIndex(indexName);                 }         //准备数据         Product product = new Product();         product.setId(1);         product.setName("product 1");                   //增加文档         addDocument(product);                   //获取文档         getDocument(1);           //修改数据         product.setName("product 2");         //修改文档         updateDocument(product);         //获取文档         getDocument(1);                   //删除文档         deleteDocument(1);         //获取文档         getDocument(1);           client.close();       }       private static void deleteDocument(int id) throws IOException {         DeleteRequest  deleteRequest = new DeleteRequest (indexName,"product", String.valueOf(id));         client.delete(deleteRequest);         System.out.println("已经从ElasticSearch服务器上删除id="+id+"的文档");     }       private static void updateDocument(Product product) throws IOException {               UpdateRequest  updateRequest = new UpdateRequest (indexName, "product", String.valueOf(product.getId()))                 .doc("name",product.getName());                           client.update(updateRequest);         System.out.println("已经在ElasticSearch服务器修改产品为："+product);               }       private static void getDocument(int id) throws IOException {         // TODO Auto-generated method stub         GetRequest request = new GetRequest(                 indexName,                 "product",                  String.valueOf(id));                   GetResponse response = client.get(request);                   if(!response.isExists()){             System.out.println("检查到服务器上 "+"id="+id+ "的文档不存在");         }         else{             String source = response.getSourceAsString();             System.out.print("获取到服务器上 "+"id="+id+ "的文档内容是：");               System.out.println(source);                       }               }       private static void addDocument(Product product) throws IOException {         Map<String, Object> jsonMap = new HashMap<>();         jsonMap.put("name", product.getName());         IndexRequest indexRequest = new IndexRequest(indexName, "product", String.valueOf(product.getId()))                 .source(jsonMap);         client.index(indexRequest);         System.out.println("已经向ElasticSearch服务器增加产品："+product);     }       private static boolean checkExistIndex(String indexName) throws IOException {         boolean result =true;         try {               OpenIndexRequest openIndexRequest = new OpenIndexRequest(indexName);             client.indices().open(openIndexRequest).isAcknowledged();           } catch (ElasticsearchStatusException ex) {             String m = "Elasticsearch exception [type=index_not_found_exception, reason=no such index]";             if (m.equals(ex.getMessage())) {                 result = false;             }         }         if(result)             System.out.println("索引:" +indexName + " 是存在的");         else             System.out.println("索引:" +indexName + " 不存在");                   return result;               }       private static void deleteIndex(String indexName) throws IOException {         DeleteIndexRequest request = new DeleteIndexRequest(indexName);         client.indices().delete(request);         System.out.println("删除了索引："+indexName);       }       private static void createIndex(String indexName) throws IOException {         // TODO Auto-generated method stub         CreateIndexRequest request = new CreateIndexRequest(indexName);         client.indices().create(request);         System.out.println("创建了索引："+indexName);     }        }

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