Flux flux = Flux
    .from("telegraf")
    .window(15L, ChronoUnit.MINUTES, 20L, ChronoUnit.SECONDS)
    .sum();

package example;

import java.time.Instant;
import java.util.List;

import com.influxdb.annotations.Column;
import com.influxdb.annotations.Measurement;
import com.influxdb.client.InfluxDBClient;
import com.influxdb.client.InfluxDBClientFactory;
import com.influxdb.client.QueryApi;
import com.influxdb.client.WriteApiBlocking;
import com.influxdb.client.domain.WritePrecision;
import com.influxdb.client.write.Point;
import com.influxdb.query.FluxRecord;
import com.influxdb.query.FluxTable;

public class InfluxDB2Example {

    private static char[] token = "my-token".toCharArray();
    private static String org = "my-org";
    private static String bucket = "my-bucket";

    public static void main(final String[] args) {

        InfluxDBClient influxDBClient = InfluxDBClientFactory.create("http://localhost:8086", token, org, bucket);

        //
        // Write data
        //
        WriteApiBlocking writeApi = influxDBClient.getWriteApiBlocking();

        //
        // Write by Data Point
        //
        Point point = Point.measurement("temperature")
                .addTag("location", "west")
                .addField("value", 55D)
                .time(Instant.now().toEpochMilli(), WritePrecision.MS);

        writeApi.writePoint(point);

        //
        // Write by LineProtocol
        //
        writeApi.writeRecord(WritePrecision.NS, "temperature,location=north value=60.0");

        //
        // Write by POJO
        //
        Temperature temperature = new Temperature();
        temperature.location = "south";
        temperature.value = 62D;
        temperature.time = Instant.now();

        writeApi.writeMeasurement( WritePrecision.NS, temperature);

        //
        // Query data
        //
        String flux = "from(bucket:\"my-bucket\") |> range(start: 0)";

        QueryApi queryApi = influxDBClient.getQueryApi();

        List<FluxTable> tables = queryApi.query(flux);
        for (FluxTable fluxTable : tables) {
            List<FluxRecord> records = fluxTable.getRecords();
            for (FluxRecord fluxRecord : records) {
                System.out.println(fluxRecord.getTime() + ": " + fluxRecord.getValueByKey("_value"));
            }
        }

        influxDBClient.close();
    }

    @Measurement(name = "temperature")
    private static class Temperature {

        @Column(tag = true)
        String location;

        @Column
        Double value;

        @Column(timestamp = true)
        Instant time;
    }
}

package example;

import java.util.Arrays;

import com.influxdb.client.InfluxDBClient;
import com.influxdb.client.InfluxDBClientFactory;
import com.influxdb.client.domain.Authorization;
import com.influxdb.client.domain.Bucket;
import com.influxdb.client.domain.Permission;
import com.influxdb.client.domain.PermissionResource;
import com.influxdb.client.domain.BucketRetentionRules;

public class InfluxDB2ManagementExample {

    private static char[] token = "my-token".toCharArray();

    public static void main(final String[] args) {

        InfluxDBClient influxDBClient = InfluxDBClientFactory.create("http://localhost:8086", token);

        //
        // Create bucket "iot_bucket" with data retention set to 3,600 seconds
        //
        BucketRetentionRules retention = new BucketRetentionRules();
        retention.setEverySeconds(3600);

        Bucket bucket = influxDBClient.getBucketsApi().createBucket("iot-bucket", retention, "12bdc4164c2e8141");

        //
        // Create access token to "iot_bucket"
        //
        PermissionResource resource = new PermissionResource();
        resource.setId(bucket.getId());
        resource.setOrgID("12bdc4164c2e8141");
        resource.setType(PermissionResource.TYPE_BUCKETS);

        // Read permission
        Permission read = new Permission();
        read.setResource(resource);
        read.setAction(Permission.ActionEnum.READ);

        // Write permission
        Permission write = new Permission();
        write.setResource(resource);
        write.setAction(Permission.ActionEnum.WRITE);

        Authorization authorization = influxDBClient.getAuthorizationsApi()
                .createAuthorization("12bdc4164c2e8141", Arrays.asList(read, write));

        //
        // Created token that can be use for writes to "iot_bucket"
        //
        String token = authorization.getToken();
        System.out.println("Token: " + token);

        influxDBClient.close();
    }
}

package example;

import java.util.List;

import com.influxdb.client.flux.FluxClient;
import com.influxdb.client.flux.FluxClientFactory;
import com.influxdb.query.FluxRecord;
import com.influxdb.query.FluxTable;

public class FluxExample {

    public static void main(String[] args) {

        FluxClient fluxClient = FluxClientFactory.create("http://localhost:8086/");

        //
        // Flux
        //
        String flux = "from(bucket: \"telegraf\")\n" +
                " |> range(start: -1d)" +
                " |> filter(fn: (r) => (r[\"_measurement\"] == \"cpu\" and r[\"_field\"] == \"usage_system\"))" +
                " |> sample(n: 5, pos: 1)";

        //
        // Synchronous query
        //
        List<FluxTable> tables = fluxClient.query(flux);

        for (FluxTable fluxTable : tables) {
            List<FluxRecord> records = fluxTable.getRecords();
            for (FluxRecord fluxRecord : records) {
                System.out.println(fluxRecord.getTime() + ": " + fluxRecord.getValueByKey("_value"));
            }
        }

        //
        // Asynchronous query
        //
        fluxClient.query(flux, (cancellable, record) -> {

            // process the flux query result record
            System.out.println(record.getTime() + ": " + record.getValue());

        }, error -> {

            // error handling while processing result
            System.out.println("Error occurred: "+ error.getMessage());

        }, () -> {

            // on complete
            System.out.println("Query completed");
        });

        fluxClient.close();
    }
}