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

  1. 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));
  1. 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();
  1. 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);
}
  1. 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!