import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;
import java.net.URLEncoder;

public class Test {
 public static void main(String[] args) throws Exception {
  Long timestamp = System.currentTimeMillis();
  String secret = "this is secret";

  String stringToSign = timestamp + "\n" + secret;
  Mac mac = Mac.getInstance("HmacSHA256");
  mac.init(new SecretKeySpec(secret.getBytes("UTF-8"), "HmacSHA256"));
  byte[] signData = mac.doFinal(stringToSign.getBytes("UTF-8"));
  String sign = URLEncoder.encode(new String(Base64.encodeBase64(signData)),"UTF-8");
  System.out.println(sign);
 }
}

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;
import java.net.URLEncoder;

public class ding {
 public static void main(String[] args) throws Exception {
  //獲取時(shí)間戳
  Long timestamp = System.currentTimeMillis();
  //定義密鑰
  String secret = "this is secret";
  //把時(shí)間戳和密鑰拼接成字符串，中間加入一個(gè)換行符
  String stringToSign = timestamp + "\n" + secret;
  //聲明一個(gè)Mac對(duì)象，用來操作字符串
  Mac mac = Mac.getInstance("HmacSHA256");
  //初始化Mac對(duì)象，設(shè)置Mac對(duì)象操作的字符串是UTF-8類型，加密方式是SHA256
  mac.init(new SecretKeySpec(secret.getBytes("UTF-8"), "HmacSHA256"));
  //把字符串轉(zhuǎn)化成字節(jié)形式
  byte[] signData = mac.doFinal(stringToSign.getBytes("UTF-8"));
  //新建一個(gè)Base64編碼對(duì)象
  Base64.Encoder encoder = Base64.getEncoder();
  //把上面的字符串進(jìn)行Base64加密后再進(jìn)行URL編碼
  String sign = URLEncoder.encode(new String(encoder.encodeToString(signData)),"UTF-8");
  //分別輸出時(shí)間戳和加密信息
  System.out.println(timestamp);
  System.out.println(sign);
 }
}

//替換參數(shù)后，在終端執(zhí)行
curl 'https://oapi.dingtalk.com/robot/send?access_token=70c168d03e73728ef36abea63c3c10048cbd054913cfeb&timestamp=1584607421017&sign=gJ3l4mhnlMuHxK1qFUx1kKUSdjuCNntsdG%2Bv%2BTCrLQM%3D' \
 -H 'Content-Type: application/json' \
 -d '{"msgtype": "text", 
  "text": {
    "content": "我就是我, 是不一樣的煙火"
  },
  "sign": "gJ3l4mhnlMuHxK1qFUx1kKUSdjuCNntsdG%2Bv%2BTCrLQM%3D"
  }'

<dependency>
 <groupId>org.apache.httpcomponents</groupId>
 <artifactId>httpclient</artifactId>
 <version>4.5.9</version>
</dependency>

public class DingService {
 //請(qǐng)求地址以及access_token
 String Webhook = "https://oapi.dingtalk.com/robot/send?access_token=YOUR TOKEN";
 //密鑰
 String secret = "YOUR SECRET";

 /*
 ** 生成時(shí)間戳和驗(yàn)證信息
 */
 
 public String encode() throws Exception {
  //獲取時(shí)間戳
  Long timestamp = System.currentTimeMillis();
  //把時(shí)間戳和密鑰拼接成字符串，中間加入一個(gè)換行符
  String stringToSign = timestamp + "\n" + this.secret;
  //聲明一個(gè)Mac對(duì)象，用來操作字符串
  Mac mac = Mac.getInstance("HmacSHA256");
  //初始化，設(shè)置Mac對(duì)象操作的字符串是UTF-8類型，加密方式是SHA256
  mac.init(new SecretKeySpec(this.secret.getBytes("UTF-8"), "HmacSHA256"));
  //把字符串轉(zhuǎn)化成字節(jié)形式
  byte[] signData = mac.doFinal(stringToSign.getBytes("UTF-8"));
  //新建一個(gè)Base64編碼對(duì)象
  Base64.Encoder encoder = Base64.getEncoder();
  //把上面的字符串進(jìn)行Base64加密后再進(jìn)行URL編碼
  String sign = URLEncoder.encode(new String(encoder.encodeToString(signData)),"UTF-8");
  System.out.println(timestamp);
  System.out.println(sign);
  String result = "&timestamp=" + timestamp + "&sign=" + sign;
  return result;
 };

 /* param: message 要發(fā)送的信息
 ** return: void 無返回值
 ** 作用：把傳入的message發(fā)送給釘釘機(jī)器人*/

 public void dingRequest(String message){
  CloseableHttpClient httpClient = HttpClientBuilder.create().build();
  String url = null;
  try {
   url = this.Webhook + this.encode();
  } catch (Exception e) {
   e.printStackTrace();
  }
  HttpPost httpPost = new HttpPost(url);
  //設(shè)置http的請(qǐng)求頭，發(fā)送json字符串，編碼UTF-8
  httpPost.setHeader("Content-Type", "application/json;charset=utf8");
  //生成json對(duì)象傳入字符
  JSONObject result = new JSONObject();
  JSONObject text = new JSONObject();
  text.put("content", message);
  result.put("text", text);
  result.put("msgtype", "text");
  String jsonString = JSON.toJSONString(result);
  StringEntity entity = new StringEntity(jsonString, "UTF-8");
  //設(shè)置http請(qǐng)求的內(nèi)容
  httpPost.setEntity(entity);
  // 響應(yīng)模型
  CloseableHttpResponse response = null;
  try {
   // 由客戶端執(zhí)行(發(fā)送)Post請(qǐng)求
   response = httpClient.execute(httpPost);
   // 從響應(yīng)模型中獲取響應(yīng)實(shí)體
   HttpEntity responseEntity = response.getEntity();
   System.out.println("響應(yīng)狀態(tài)為:" + response.getStatusLine());
   if (responseEntity != null) {
    System.out.println("響應(yīng)內(nèi)容長度為:" + responseEntity.getContentLength());
    System.out.println("響應(yīng)內(nèi)容為:" + EntityUtils.toString(responseEntity));
   }
  } catch (Exception e) {
   e.printStackTrace();
  } finally {
   try {
    // 釋放資源
    if (httpClient != null) {
     httpClient.close();
    }
    if (response != null) {
     response.close();
    }
   } catch (Exception e) {
    e.printStackTrace();
   }
  }
 }
}