前提，首先获取到腾讯云的AK SK
登录腾讯云官网控制台后访问
https://console.cloud.tencent.com/cam/capi
可以看到
这个密钥对即是我们访问API的钥匙。
新建一个main函数，整个API请求的签名共分为五个步骤
1.拼接请求串。
2.拼接待签名串
3.计算签名
4.拼接Authorization
5.请求API
代码语言：javascript复制public class CBSAPI {
private final static Charset UTF8 = StandardCharsets.UTF_8;
private final static String SECRET_ID = "改成自己的";
private final static String SECRET_KEY = "改成自己的";
private final static String CT_JSON = "application/json; charset=utf-8";
public static byte[] hmac256(byte[] key, String msg) throws Exception {
Mac mac = Mac.getInstance("HmacSHA256");
SecretKeySpec secretKeySpec = new SecretKeySpec(key, mac.getAlgorithm());
mac.init(secretKeySpec);
return mac.doFinal(msg.getBytes(UTF8));
}
public static String sha256Hex(String s) throws Exception {
MessageDigest md = MessageDigest.getInstance("SHA-256");
byte[] d = md.digest(s.getBytes(UTF8));
return DatatypeConverter.printHexBinary(d).toLowerCase();
}
public static void main(String[] args) throws Exception {
String service = "cbs";
String host = "cbs.tencentcloudapi.com";
String region = "ap-beijing";
String action = "DescribeDisks";
String version = "2017-03-12";
String algorithm = "TC3-HMAC-SHA256";
String timestamp = String.valueOf(System.currentTimeMillis() / 1000);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
// 注意时区，否则容易出错
sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
String date = sdf.format(new Date(Long.valueOf(timestamp "000")));
// ************* 步骤 1：拼接规范请求串 *************
String httpRequestMethod = "POST";
String canonicalUri = "/";
String canonicalQueryString = "";
String canonicalHeaders = "content-type:application/json; charset=utf-8n" "host:" host "n"
"x-tc-action:" action.toLowerCase() "n";
String signedHeaders = "content-type;host;x-tc-action";
String payload = "{"Limit": 100}";
String hashedRequestPayload = sha256Hex(payload);
String canonicalRequest = httpRequestMethod "n" canonicalUri "n" canonicalQueryString "n"
canonicalHeaders "n" signedHeaders "n" hashedRequestPayload;
System.out.println(canonicalRequest);
// ************* 步骤 2：拼接待签名字符串 *************
String credentialScope = date "/" service "/" "tc3_request";
String hashedCanonicalRequest = sha256Hex(canonicalRequest);
String stringToSign = algorithm "n" timestamp "n" credentialScope "n" hashedCanonicalRequest;
System.out.println(stringToSign);
// ************* 步骤 3：计算签名 *************
byte[] secretDate = hmac256(("TC3" SECRET_KEY).getBytes(UTF8), date);
byte[] secretService = hmac256(secretDate, service);
byte[] secretSigning = hmac256(secretService, "tc3_request");
String signature = DatatypeConverter.printHexBinary(hmac256(secretSigning, stringToSign)).toLowerCase();
System.out.println(signature);
// ************* 步骤 4：拼接 Authorization *************
String authorization = algorithm " " "Credential=" SECRET_ID "/" credentialScope ", "
"SignedHeaders=" signedHeaders ", " "Signature=" signature;
System.out.println(authorization);
TreeMap<String, String> headers = new TreeMap<String, String>();
headers.put("Authorization", authorization);
headers.put("Content-Type", CT_JSON);
headers.put("Host", host);
headers.put("X-TC-Action", action);
headers.put("X-TC-Timestamp", timestamp);
headers.put("X-TC-Version", version);
headers.put("X-TC-Region", region);
StringBuilder sb = new StringBuilder();
sb.append("curl -X POST https://").append(host).append(" -H "Authorization: ").append(authorization)
.append(""").append(" -H "Content-Type: application/json; charset=utf-8"").append(" -H "Host: ")
.append(host).append(""").append(" -H "X-TC-Action: ").append(action).append(""")
.append(" -H "X-TC-Timestamp: ").append(timestamp).append(""").append(" -H "X-TC-Version: ")
.append(version).append(""").append(" -H "X-TC-Region: ").append(region).append(""").append(" -d '")
.append(payload).append("'");
System.out.println(sb.toString());
}
}生成后会得到一个curl命令。例如：
curl -X POST https://cbs.tencentcloudapi.com -H "Authorization: TC3-HMAC-SHA256 Credential=AKIDc7ORGrMkwvhEZic2FE0XvCIAsRp6C83u/2023-09-14/cbs/tc3_request, SignedHeaders=content-type;host;x-tc-action, Signature=162933d7a933f4e552888d0d65297061e5e36fd83b44318a45daad46dc21c256" -H "Content-Type: application/json; charset=utf-8" -H "Host: cbs.tencentcloudapi.com" -H "X-TC-Action: DescribeDisks" -H "X-TC-Timestamp: 1694676570" -H "X-TC-Version: 2017-03-12" -H "X-TC-Region: ap-beijing" -d '{"Limit": 100}'
测试一下访问：
正常通过。所以就可以在自己的代码中构造request请求来实现与API的调用了。
