基于java使用钉钉机器人向钉钉群推送消息

package com.thinkgem.wlw.modules.lhjh.DingTalk;

import com.alibaba.fastjson.JSON;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.net.URL;
import java.net.URLConnection;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
/**
 * @Author: zhouhe
 * @Date: 2019/6/20 14:49
 */
public class SendHttps {
  private static Logger logger = LoggerFactory.getLogger(SendHttps.class);
  /**
   * 发送POST请求，参数是Map, contentType=x-www-form-urlencoded
   *
   * @param url
   * @param mapParam
   * @return
   */
  public static String sendPostByMap(String url, Map<String, Object> mapParam) {
    Map<String, String> headParam = new HashMap();
    headParam.put("Content-type", "application/json;charset=UTF-8");
    return sendPost(url, mapParam, headParam);
  }

  /**
   * 向指定 URL 发送POST方法的请求
   *
   * @param url  发送请求的 URL
   * @param param 请求参数，
   * @return 所代表远程资源的响应结果
   */
  public static String sendPost(String url, Map<String, Object> param, Map<String, String> headParam) {
    PrintWriter out = null;
    BufferedReader in = null;
    String result = "";
    try {
      URL realUrl = new URL(url);
      // 打开和URL之间的连接
      URLConnection conn = realUrl.openConnection();
      // 设置通用的请求属性 请求头
      conn.setRequestProperty("accept", "*/*");
      conn.setRequestProperty("connection", "Keep-Alive");
      conn.setRequestProperty("user-agent",
          "Fiddler");

      if (headParam != null) {
        for (Entry<String, String> entry : headParam.entrySet()) {
          conn.setRequestProperty(entry.getKey(), entry.getValue());
        }
      }
      // 发送POST请求必须设置如下两行
      conn.setDoOutput(true);
      conn.setDoInput(true);
      // 获取URLConnection对象对应的输出流
      out = new PrintWriter(conn.getOutputStream());
      // 发送请求参数
      out.print(JSON.toJSONString(param));
      // flush输出流的缓冲
      out.flush();
      // 定义BufferedReader输入流来读取URL的响应
      in = new BufferedReader(
          new InputStreamReader(conn.getInputStream()));
      String line;
      while ((line = in.readLine()) != null) {
        result += line;
      }
    } catch (Exception e) {
      logger.info("发送 POST 请求出现异常！" + e);
      e.printStackTrace();
    }
    //使用finally块来关闭输出流、输入流
    finally {
      try {
        if (out != null) {
          out.close();
        }
        if (in != null) {
          in.close();
        }
      } catch (IOException ex) {
        ex.printStackTrace();
      }
    }
    return result;
  }
}

package com.thinkgem.wlw.modules.lhjh.DingTalk;

import java.util.HashMap;
import java.util.Map;

/**
 * @Author: zhouhe
 * @Date: 2019/6/20 14:52
 */
public class SendMessage {
  public static void main(String[] args){

    // 钉钉的webhook
    String dingDingToken="https://oapi.dingtalk.com/robot/send?access_token=0f0daca33m98gn78f00189fe1e1e908b81fa26d0d8ddd48fa78a844cd8636187";
    // 请求的JSON数据，这里我用map在工具类里转成json格式
    Map<String,Object> json=new HashMap();
    Map<String,Object> text=new HashMap();
    json.put("msgtype","text");
    text.put("content","临涣焦化：VOCs排放浓度大于上限：61.89");
    json.put("text",text);
    // 发送post请求
    String response = SendHttps.sendPostByMap(dingDingToken, json);
    System.out.println("相应结果："+response);

  }
}