Elasticsearch系列(七)----JAVA客户端之RestClient操作详解

elasticsearch 5.0引入了一个新的客户端 RestClient ，使用HTTP API elasticsearch代替内部协议, RestClient 初始化方法是线程安全的，最理想的客户端生命周期是与应用相同，在应用停止服务之前应该关闭客户端链接，释放资源。

[html] view plain copy print?

1. 初始化客户端  
2. RestClient restClient = RestClient.builder(  
3.             new HttpHost("xxxx", 9800, "http"),  
4.             new HttpHost("xxxx", 9800, "http")).build();  
5.   
6. 关闭客户端连接  
7. restClient.close();  

    初始化客户端
    RestClient restClient = RestClient.builder(
                new HttpHost("xxxx", 9800, "http"),
                new HttpHost("xxxx", 9800, "http")).build();

    关闭客户端连接
    restClient.close();

RestClient完整示例如下:

[html] view plain copy print?

1. package com.fendo.RestClient;  
2.   
3.   
4. import java.io.IOException;  
5. import java.util.Collections;  
6.   
7. import org.apache.http.HttpEntity;  
8. import org.apache.http.HttpHost;  
9. import org.apache.http.auth.AuthScope;  
10. import org.apache.http.auth.UsernamePasswordCredentials;  
11. import org.apache.http.client.CredentialsProvider;  
12. import org.apache.http.entity.ContentType;  
13. import org.apache.http.impl.client.BasicCredentialsProvider;  
14. import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;  
15. import org.apache.http.nio.entity.NStringEntity;  
16. import org.apache.http.util.EntityUtils;  
17. import org.elasticsearch.action.search.SearchResponse;  
18. import org.elasticsearch.client.Response;  
19. import org.elasticsearch.client.RestClient;  
20. import org.elasticsearch.client.RestClientBuilder;  
21. import org.elasticsearch.index.query.QueryBuilder;  
22. import org.elasticsearch.index.query.QueryBuilders;  
23. import org.junit.Before;  
24. import org.junit.Test;  
25.   
26. /**  
27.  * Elasticserach RestClient示例  
28.  * @author fendo  
29.  *  
30.  */  
31. public class Rest {  
32.   
33.     private static RestClient restClient;  
34.       
35.       
36.       
37.     public void getRestClient(){  
38.           
39.         final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();  
40.         credentialsProvider.setCredentials(AuthScope.ANY,  
41.                 new UsernamePasswordCredentials("elastic", "changeme"));  
42.           
43.         restClient = RestClient.builder(new HttpHost("localhost",9200,"http"))  
44.                 .setHttpClientConfigCallback(new RestClientBuilder.HttpClientConfigCallback() {  
45.                     @Override  
46.                     public HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) {  
47.                         return httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);  
48.                     }  
49.                 }).build();  
50.           
51.     }  
52.       
53.     @Before  
54.     public void getRest(){  
55.         restClient = RestClient.builder(new HttpHost("localhost", 9200, "http")).build();   
56.     }  
57.       
58.   
59.   
60.     /**  
61.      * 查看api信息  
62.      * @throws Exception  
63.      */  
64.     @Test  
65.     public void CatApi() throws Exception{  
66.         String method = "GET";  
67.         String endpoint = "/_cat";  
68.         Response response = restClient.performRequest(method,endpoint);  
69.         System.out.println(EntityUtils.toString(response.getEntity()));  
70.     }  
71.       
72.     /**  
73.      * 创建索引  
74.      * @throws Exception  
75.      */  
76.     @Test  
77.     public void CreateIndex() throws Exception{  
78.         String method = "PUT";  
79.         String endpoint = "/test-index";  
80.         Response response = restClient.performRequest(method,endpoint);  
81.         System.out.println(EntityUtils.toString(response.getEntity()));  
82.     }  
83.       
84.     /**  
85.      * 创建文档  
86.      * @throws Exception  
87.      */  
88.     @Test  
89.     public void CreateDocument()throws Exception{  
90.   
91.         String method = "PUT";  
92.         String endpoint = "/test-index/test/1";  
93.         HttpEntity entity = new NStringEntity(  
94.                 "{\n" +  
95.                         "    \"user\" : \"kimchy\",\n" +  
96.                         "    \"post_date\" : \"2009-11-15T14:12:12\",\n" +  
97.                         "    \"message\" : \"trying out Elasticsearch\"\n" +  
98.                         "}", ContentType.APPLICATION_JSON);  
99.   
100.         Response response = restClient.performRequest(method,endpoint, Collections. <String, String>emptyMap(),entity);  
101.         System.out.println(EntityUtils.toString(response.getEntity()));  
102.     }  
103.       
104.     /**  
105.      * 获取文档  
106.      * @throws Exception  
107.      */  
108.     @Test  
109.     public void getDocument()throws Exception{  
110.         String method = "GET";  
111.         String endpoint = "/test-index/test/1";  
112.         Response response = restClient.performRequest(method,endpoint);  
113.         System.out.println(EntityUtils.toString(response.getEntity()));  
114.     }  
115.       
116.       
117.     /**  
118.      * 查询所有数据  
119.      * @throws Exception  
120.      */  
121.     @Test  
122.     public void QueryAll() throws Exception {  
123.         String method = "POST";  
124.         String endpoint = "/test-index/test/_search";  
125.         HttpEntity entity = new NStringEntity("{\n" +  
126.                 "  \"query\": {\n" +  
127.                 "    \"match_all\": {}\n" +  
128.                 "  }\n" +  
129.                 "}", ContentType.APPLICATION_JSON);  
130.   
131.         Response response = restClient.performRequest(method,endpoint,Collections. <String, String>emptyMap(),entity);  
132.         System.out.println(EntityUtils.toString(response.getEntity()));  
133.     }  
134.       
135.     /**  
136.      * 根据ID获取  
137.      * @throws Exception  
138.      */  
139.     @Test  
140.     public void QueryByField() throws Exception {  
141.         String method = "POST";  
142.         String endpoint = "/test-index/test/_search";  
143.         HttpEntity entity = new NStringEntity("{\n" +  
144.                 "  \"query\": {\n" +  
145.                 "    \"match\": {\n" +  
146.                 "      \"user\": \"kimchy\"\n" +  
147.                 "    }\n" +  
148.                 "  }\n" +  
149.                 "}", ContentType.APPLICATION_JSON);  
150.   
151.         Response response = restClient.performRequest(method,endpoint,Collections. <String, String>emptyMap(),entity);  
152.         System.out.println(EntityUtils.toString(response.getEntity()));  
153.     }  
154.       
155.     /**  
156.      * 更新数据  
157.      * @throws Exception  
158.      */  
159.     @Test  
160.     public void UpdateByScript() throws Exception {  
161.         String method = "POST";  
162.         String endpoint = "/test-index/test/1/_update";  
163.         HttpEntity entity = new NStringEntity("{\n" +  
164.                 "  \"doc\": {\n" +  
165.                 "    \"user\":\"大美女\"\n" +  
166.                 "   }\n" +  
167.                 "}", ContentType.APPLICATION_JSON);  
168.         Response response = restClient.performRequest(method,endpoint,Collections. <String, String>emptyMap(),entity);  
169.         System.out.println(EntityUtils.toString(response.getEntity()));  
170.     }  
171.       
172.       
173.     @Test  
174.     public void GeoBoundingBox() throws IOException {  
175.         String method = "POST";  
176.         String endpoint = "/attractions/restaurant/_search";  
177.         HttpEntity entity = new NStringEntity("{\n" +  
178.                 "  \"query\": {\n" +  
179.                 "    \"match_all\": {}\n" +  
180.                 "  },\n" +  
181.                 "  \"post_filter\": {\n" +  
182.                 "    \"geo_bounding_box\": {\n" +  
183.                 "      \"location\": {\n" +  
184.                 "        \"top_left\": {\n" +  
185.                 "          \"lat\": 39.990481,\n" +  
186.                 "          \"lon\": 116.277144\n" +  
187.                 "        },\n" +  
188.                 "        \"bottom_right\": {\n" +  
189.                 "          \"lat\": 39.927323,\n" +  
190.                 "          \"lon\": 116.405638\n" +  
191.                 "        }\n" +  
192.                 "      }\n" +  
193.                 "    }\n" +  
194.                 "  }\n" +  
195.                 "}", ContentType.APPLICATION_JSON);  
196.         Response response =  restClient.performRequest(method,endpoint,Collections.<String, String >emptyMap(),entity);  
197.         System.out.println(EntityUtils.toString(response.getEntity()));  
198.     }  
199. }  

package com.fendo.RestClient;


import java.io.IOException;
import java.util.Collections;

import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.entity.ContentType;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
import org.apache.http.nio.entity.NStringEntity;
import org.apache.http.util.EntityUtils;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.Response;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.junit.Before;
import org.junit.Test;

/**
 * Elasticserach RestClient示例
 * @author fendo
 *
 */
public class Rest {

	private static RestClient restClient;
	
	
	
	public void getRestClient(){
		
        final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
        credentialsProvider.setCredentials(AuthScope.ANY,
                new UsernamePasswordCredentials("elastic", "changeme"));
	    
        restClient = RestClient.builder(new HttpHost("localhost",9200,"http"))
                .setHttpClientConfigCallback(new RestClientBuilder.HttpClientConfigCallback() {
                    @Override
                    public HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) {
                        return httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);
                    }
                }).build();
        
	}
	
	@Before
	public void getRest(){
		restClient = RestClient.builder(new HttpHost("localhost", 9200, "http")).build(); 
	}
	


	/**
	 * 查看api信息
	 * @throws Exception
	 */
	@Test
	public void CatApi() throws Exception{
        String method = "GET";
        String endpoint = "/_cat";
        Response response = restClient.performRequest(method,endpoint);
        System.out.println(EntityUtils.toString(response.getEntity()));
	}
	
	/**
	 * 创建索引
	 * @throws Exception
	 */
	@Test
	public void CreateIndex() throws Exception{
        String method = "PUT";
        String endpoint = "/test-index";
        Response response = restClient.performRequest(method,endpoint);
        System.out.println(EntityUtils.toString(response.getEntity()));
	}
	
	/**
	 * 创建文档
	 * @throws Exception
	 */
	@Test
	public void CreateDocument()throws Exception{

        String method = "PUT";
        String endpoint = "/test-index/test/1";
        HttpEntity entity = new NStringEntity(
                "{\n" +
                        "    \"user\" : \"kimchy\",\n" +
                        "    \"post_date\" : \"2009-11-15T14:12:12\",\n" +
                        "    \"message\" : \"trying out Elasticsearch\"\n" +
                        "}", ContentType.APPLICATION_JSON);

        Response response = restClient.performRequest(method,endpoint, Collections.<String, String>emptyMap(),entity);
        System.out.println(EntityUtils.toString(response.getEntity()));
	}
	
	/**
	 * 获取文档
	 * @throws Exception
	 */
	@Test
	public void getDocument()throws Exception{
        String method = "GET";
        String endpoint = "/test-index/test/1";
        Response response = restClient.performRequest(method,endpoint);
        System.out.println(EntityUtils.toString(response.getEntity()));
	}
	
	
	/**
	 * 查询所有数据
	 * @throws Exception
	 */
    @Test
    public void QueryAll() throws Exception {
        String method = "POST";
        String endpoint = "/test-index/test/_search";
        HttpEntity entity = new NStringEntity("{\n" +
                "  \"query\": {\n" +
                "    \"match_all\": {}\n" +
                "  }\n" +
                "}", ContentType.APPLICATION_JSON);

        Response response = restClient.performRequest(method,endpoint,Collections.<String, String>emptyMap(),entity);
        System.out.println(EntityUtils.toString(response.getEntity()));
    }
	
    /**
     * 根据ID获取
     * @throws Exception
     */
    @Test
    public void QueryByField() throws Exception {
        String method = "POST";
        String endpoint = "/test-index/test/_search";
        HttpEntity entity = new NStringEntity("{\n" +
                "  \"query\": {\n" +
                "    \"match\": {\n" +
                "      \"user\": \"kimchy\"\n" +
                "    }\n" +
                "  }\n" +
                "}", ContentType.APPLICATION_JSON);

        Response response = restClient.performRequest(method,endpoint,Collections.<String, String>emptyMap(),entity);
        System.out.println(EntityUtils.toString(response.getEntity()));
    }
    
    /**
     * 更新数据
     * @throws Exception
     */
    @Test
    public void UpdateByScript() throws Exception {
        String method = "POST";
        String endpoint = "/test-index/test/1/_update";
        HttpEntity entity = new NStringEntity("{\n" +
                "  \"doc\": {\n" +
                "    \"user\":\"大美女\"\n" +
                "	}\n" +
                "}", ContentType.APPLICATION_JSON);
        Response response = restClient.performRequest(method,endpoint,Collections.<String, String>emptyMap(),entity);
        System.out.println(EntityUtils.toString(response.getEntity()));
    }
    
    
    @Test
    public void GeoBoundingBox() throws IOException {
        String method = "POST";
        String endpoint = "/attractions/restaurant/_search";
        HttpEntity entity = new NStringEntity("{\n" +
                "  \"query\": {\n" +
                "    \"match_all\": {}\n" +
                "  },\n" +
                "  \"post_filter\": {\n" +
                "    \"geo_bounding_box\": {\n" +
                "      \"location\": {\n" +
                "        \"top_left\": {\n" +
                "          \"lat\": 39.990481,\n" +
                "          \"lon\": 116.277144\n" +
                "        },\n" +
                "        \"bottom_right\": {\n" +
                "          \"lat\": 39.927323,\n" +
                "          \"lon\": 116.405638\n" +
                "        }\n" +
                "      }\n" +
                "    }\n" +
                "  }\n" +
                "}", ContentType.APPLICATION_JSON);
        Response response = restClient.performRequest(method,endpoint,Collections.<String, String>emptyMap(),entity);
        System.out.println(EntityUtils.toString(response.getEntity()));
    }
}

完整示例: download.csdn.net/download/u0…