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开发代码示例

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本文介绍开发代码示例内容。

依赖包

请先下载依赖包HTTP ClienFast JSON

<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.2</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.82</version>
</dependency>

示例代码

package org.hitsdb.client;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.junit.Test;

import com.alibaba.fastjson.JSON;

public class HttpWrite {
  private final static String HITSDB_IP = "192.168.11.17";  //实例地址
  private final static int HITSDB_PORT = 8242; //实例端口
  private final static int SYNC_TIMEOUT_MS = 60 * 1000;
  private Long startTime = System.currentTimeMillis();

  static String putUrl = "http://" + HITSDB_IP + ":" + HITSDB_PORT +
                  "/api/put?sync_timeout=" + SYNC_TIMEOUT_MS;
  static String queryUrl = "http://" + HITSDB_IP + ":" + HITSDB_PORT +
                    "/api/query";


  static class DataPoint {
    public String metric;
    public Long timestamp;
    public Double value;
    public Map<String, String> tags;
  }

  String buildData() {
    // 构造写入数据实体
    List<DataPoint> dataPoints = new ArrayList<DataPoint>();
    for (int i = 0; i < 3600; ++i) {
      DataPoint dataPoint = new DataPoint();
      dataPoint.metric = "sys.cpu";
      dataPoint.timestamp = startTime + i * 1000;
      dataPoint.value = 32.4;
      dataPoint.tags = new HashMap<String, String>();
      dataPoint.tags.put("host", "host1");
      dataPoint.tags.put("appName", "test1");
      dataPoints.add(dataPoint);
    }
    return JSON.toJSONString(dataPoints);
  }

  @Test
  public void putDemo() throws ClientProtocolException, IOException {
    CloseableHttpClient httpClient = HttpClients.createDefault();
    HttpPost httpPost = new HttpPost(putUrl);
    StringEntity eStringEntity = new StringEntity(buildData(), "utf-8");
    eStringEntity.setContentType("application/json");
    httpPost.setEntity(eStringEntity);
    HttpResponse response = httpClient.execute(httpPost);
    int statusCode = response.getStatusLine().getStatusCode();
    if (statusCode == 200 || statusCode == 204) {
      System.out.println("write OK");
    }
    httpClient.close();
  }
}
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