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 + "]";
	}
	
}

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);
	}
     
}