使用Java查询ES所有索引
流程图
graph LR
A[开始] --> B[创建ES客户端]
B --> C[发送查询请求]
C --> D[处理返回结果]
D --> E[关闭ES客户端]
E --> F[结束]
步骤说明
- 创建ES客户端:使用Java的TransportClient类创建一个连接ES集群的客户端。代码如下:
TransportClient client = new PreBuiltTransportClient(Settings.EMPTY)
.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("localhost"), 9300));
- 发送查询请求:使用创建的客户端发送一个查询所有索引的请求。代码如下:
GetIndexRequest request = new GetIndexRequest("*");
GetIndexResponse response = client.admin().indices().getIndex(request).actionGet();
- 处理返回结果:获取返回的索引列表并进行处理。代码如下:
String[] indices = response.getIndices();
for (String index : indices) {
System.out.println(index);
}
- 关闭ES客户端:在查询完成后关闭ES客户端,释放资源。代码如下:
client.close();
完整代码如下:
import org.elasticsearch.action.admin.indices.get.GetIndexRequest;
import org.elasticsearch.action.admin.indices.get.GetIndexResponse;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.elasticsearch.transport.client.PreBuiltTransportClient;
import java.net.InetAddress;
import java.net.UnknownHostException;
public class ESIndexQuery {
public static void main(String[] args) throws UnknownHostException {
// 创建ES客户端
TransportClient client = new PreBuiltTransportClient(Settings.EMPTY)
.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("localhost"), 9300));
// 发送查询请求
GetIndexRequest request = new GetIndexRequest("*");
GetIndexResponse response = client.admin().indices().getIndex(request).actionGet();
// 处理返回结果
String[] indices = response.getIndices();
for (String index : indices) {
System.out.println(index);
}
// 关闭ES客户端
client.close();
}
}
甘特图
gantt
dateFormat YYYY-MM-DD
title 使用Java查询ES所有索引
section 查询索引
创建ES客户端 :a1, 2022-10-01, 1d
发送查询请求 :a2, after a1, 1d
处理返回结果 :a3, after a2, 1d
关闭ES客户端 :a4, after a3, 1d
关系图
erDiagram
CUSTOMER ||--o{ ORDER : places
ORDER ||--|{ LINE-ITEM : contains
CUSTOMER }|--|{ DELIVERY-ADDRESS : uses
以上就是使用Java查询ES所有索引的步骤和代码示例。通过创建ES客户端、发送查询请求、处理返回结果以及关闭ES客户端,我们可以完成这个任务。希望对你有所帮助!