代码在线运行平台：www.json.cn/runcode/run…

go demo

package main

import (
    "crypto/hmac"
    "crypto/sha256"
    "encoding/hex"
    "fmt"
)

func main() {
 key := "abcdef"
 signStr := "test"
 h := hmac.New(sha256.New, []byte(key))
 h.Write([]byte(signStr))
 s := hex.EncodeToString(h.Sum([]byte("")))
 fmt.Println(s)
}

python demo

import datetime
import hmac

key = 'abcdef'
dignStr = 'test'
s =  hmac.digest(
        key.encode(),
        dignStr.encode(),
        'SHA256',
    ).hex()

print(s)

java demo

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

public class Main {
	public static void main(String[] args) {
	    try {
	        String key = "abcdef";
	        String signStr = "test";
	        Mac mac = Mac.getInstance("HmacSHA256");
            mac.init(new SecretKeySpec(key.getBytes("UTF-8"), "HmacSHA256"));
            byte[] signData = mac.doFinal(signStr.getBytes("UTF-8"));
            StringBuilder sb = new StringBuilder();
            for (byte item : signData) {
                sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));
            }
            System.out.println(sb.toString().toLowerCase());
	    } catch(Exception e) {
	    }
	}
}