JavaRestClient操作Elasticsearch基本文档的CRUD

墨蓝 2022-12-23 14:24 183阅读 0赞

# 导包 #

因为我用的springboot做的测试

<parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.1.3.RELEASE</version>
        </parent>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-logging</artifactId>
            </dependency>
            <dependency>
                <groupId>com.google.code.gson</groupId>
                <artifactId>gson</artifactId>
                <version>2.8.5</version>
            </dependency>
            <dependency>
                <groupId>org.apache.commons</groupId>
                <artifactId>commons-lang3</artifactId>
                <version>3.8.1</version>
            </dependency>
             <dependency>
                <groupId>commons-beanutils</groupId>
                <artifactId>commons-beanutils</artifactId>
                <version>1.9.1</version>
            </dependency>
            <dependency>
                <groupId>org.elasticsearch.client</groupId>
                <artifactId>elasticsearch-rest-high-level-client</artifactId>
                <version>6.4.3</version>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
            </dependency>
        </dependencies>
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>

# application.yml配置 #

集群配置,这里主要是为了`SpringDataElasticsearch`

spring:
      data:
        elasticsearch:
          cluster-name: text-elastic #集群名称
          cluster-nodes: 127.0.0.1:9301,127.0.0.1:9302,127.0.0.1:9303 #有多少机器,写多少

# 新增方法 #

import com.google.gson.Gson;
    import com.leyou.pojo.Item;
    import org.apache.http.HttpHost;
    import org.elasticsearch.action.index.IndexRequest;
    import org.elasticsearch.action.index.IndexResponse;
    import org.elasticsearch.client.RequestOptions;
    import org.elasticsearch.client.RestClient;
    import org.elasticsearch.client.RestHighLevelClient;
    import org.elasticsearch.common.xcontent.XContentType;
    import org.junit.After;
    import org.junit.Before;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.test.context.junit4.SpringRunner;
    import java.io.IOException;
    
    @RunWith(SpringRunner.class)
    @SpringBootTest
    public class Esdemo1 { 
    
        private RestHighLevelClient client;
    
        private Gson gson = new Gson();
        
        /** * 先执行 */
        @Before
        public void init (){ 
            // 初始化HighLevel客户端
            client = new RestHighLevelClient(
                    RestClient.builder(
                            HttpHost.create("http://127.0.0.1:9201"),
                            HttpHost.create("http://127.0.0.1:9202"),
                            HttpHost.create("http://127.0.0.1:9203")
                    )
            );
        }
        
    /* * 新增文档 */
        @Test
        public void testAddIndex() throws IOException { 
            // 准备文档数据：
            Item item = new Item(1L, "小米手机9", " 手机","小米", 3499.00, "http://image.csdn.com/13123.jpg");
            // 转为Json格式：
            String toJson = gson.toJson(item);
            // 创建一个新增索引的请求,并指定是JSON格式
            IndexRequest indexRequest = new IndexRequest("索引名", "类型名", item.getId().toString()).source(toJson, XContentType.JSON);
            // 发起请求
            IndexResponse indexResponse = client.index(indexRequest, RequestOptions.DEFAULT);
    
            System.out.println("Response:"+indexResponse);
        }
    
        /** * 后执行 */
        @After
        public void close(){ 
            try { 
                client.close();
            } catch (IOException e) { 
                e.printStackTrace();
            }
        }
    }

# 查看文档 #

import com.google.gson.Gson;
    import com.leyou.pojo.Item;
    import org.apache.http.HttpHost;
    import org.elasticsearch.action.get.GetRequest;
    import org.elasticsearch.action.get.GetResponse;
    import org.elasticsearch.action.index.IndexRequest;
    import org.elasticsearch.action.index.IndexResponse;
    import org.elasticsearch.client.RequestOptions;
    import org.elasticsearch.client.RestClient;
    import org.elasticsearch.client.RestHighLevelClient;
    import org.elasticsearch.common.xcontent.XContentType;
    import org.junit.After;
    import org.junit.Before;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.test.context.junit4.SpringRunner;
    
    import java.io.IOException;
    
    @RunWith(SpringRunner.class)
    @SpringBootTest
    public class Esdemo1 { 
    
        private RestHighLevelClient client;
    
        private Gson gson = new Gson();
        /** * 先执行 */
        @Before
        public void init (){ 
            // 初始化HighLevel客户端
            client = new RestHighLevelClient(
                    RestClient.builder(
                            HttpHost.create("http://127.0.0.1:9201"),
                            HttpHost.create("http://127.0.0.1:9202"),
                            HttpHost.create("http://127.0.0.1:9203")
                    )
            );
        }
    
        /** * 查看文档 */
        @Test
        public void testFindIndex() throws IOException { 
            // 创建get请求，并指定id
            GetRequest getRequest = new GetRequest("索引名","类型名","1");
            // 查询，得到响应
            GetResponse response = client.get(getRequest, RequestOptions.DEFAULT);
            // 解析响应，应该是json
            String source = response.getSourceAsString();
            //json转对象
            Item item = gson.fromJson(source, Item.class);
            //打印
            System.out.println("item::"+item);
        }
    
        /** * 后执行 */
        @After
        public void close(){ 
            try { 
                client.close();
            } catch (IOException e) { 
                e.printStackTrace();
            }
        }
    }

# 修改文档 #

新增时，如果传递的id是已经存在的，则会完成修改操作，如果不存在，则是新增

import com.google.gson.Gson;
    import com.leyou.pojo.Item;
    import org.apache.http.HttpHost;
    import org.elasticsearch.action.index.IndexRequest;
    import org.elasticsearch.action.index.IndexResponse;
    import org.elasticsearch.client.RequestOptions;
    import org.elasticsearch.client.RestClient;
    import org.elasticsearch.client.RestHighLevelClient;
    import org.elasticsearch.common.xcontent.XContentType;
    import org.junit.After;
    import org.junit.Before;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.test.context.junit4.SpringRunner;
    import java.io.IOException;
    
    @RunWith(SpringRunner.class)
    @SpringBootTest
    public class Esdemo1 { 
    
        private RestHighLevelClient client;
    
        private Gson gson = new Gson();
        
        /** * 先执行 */
        @Before
        public void init (){ 
            // 初始化HighLevel客户端
            client = new RestHighLevelClient(
                    RestClient.builder(
                            HttpHost.create("http://127.0.0.1:9201"),
                            HttpHost.create("http://127.0.0.1:9202"),
                            HttpHost.create("http://127.0.0.1:9203")
                    )
            );
        }
        
    /* * 新增时，如果传递的id是已经存在的，则会完成修改操作，如果不存在，则是新增 */
        @Test
        public void testAddIndex() throws IOException { 
            // 准备文档数据：
            Item item = new Item(1L, "小米手机9", " 手机","小米", 3499.00, "http://image.csdn.com/13123.jpg");
            // 转为Json格式：
            String toJson = gson.toJson(item);
            // 创建一个新增索引的请求,并指定是JSON格式
            IndexRequest indexRequest = new IndexRequest("索引名", "类型名", item.getId().toString()).source(toJson, XContentType.JSON);
            // 发起请求
            IndexResponse indexResponse = client.index(indexRequest, RequestOptions.DEFAULT);
    
            System.out.println("Response:"+indexResponse);
        }
    
        /** * 后执行 */
        @After
        public void close(){ 
            try { 
                client.close();
            } catch (IOException e) { 
                e.printStackTrace();
            }
        }
    }

# 删除文档 #

import com.google.gson.Gson;
    import com.leyou.pojo.Item;
    import org.apache.http.HttpHost;
    import org.elasticsearch.action.delete.DeleteRequest;
    import org.elasticsearch.action.delete.DeleteResponse;
    import org.elasticsearch.action.get.GetRequest;
    import org.elasticsearch.action.get.GetResponse;
    import org.elasticsearch.action.index.IndexRequest;
    import org.elasticsearch.action.index.IndexResponse;
    import org.elasticsearch.client.RequestOptions;
    import org.elasticsearch.client.RestClient;
    import org.elasticsearch.client.RestHighLevelClient;
    import org.elasticsearch.common.xcontent.XContentType;
    import org.junit.After;
    import org.junit.Before;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.test.context.junit4.SpringRunner;
    
    import java.io.IOException;
    
    @RunWith(SpringRunner.class)
    @SpringBootTest
    public class Esdemo1 { 
    
        private RestHighLevelClient client;
    
        private Gson gson = new Gson();
        /** * 先执行 */
        @Before
        public void init (){ 
            // 初始化HighLevel客户端
            client = new RestHighLevelClient(
                    RestClient.builder(
                            HttpHost.create("http://127.0.0.1:9201"),
                            HttpHost.create("http://127.0.0.1:9202"),
                            HttpHost.create("http://127.0.0.1:9203")
                    )
            );
        }
    
        /** * 删除文档 */
        @Test
        public void testDeleteIndex() throws IOException { 
            //创建删除请求,传入id
            DeleteRequest deleteRequest = new DeleteRequest("索引名","类型名","1");
            // 发起请求
            DeleteResponse deleteResponse = client.delete(deleteRequest, RequestOptions.DEFAULT);
            //打印
            System.out.println("response = " + deleteResponse);
        }
    
        /** * 后执行 */
        @After
        public void close(){ 
            try { 
                client.close();
            } catch (IOException e) { 
                e.printStackTrace();
            }
        }
    }