调用API示例

1. 把API信息替换到HttpClientDemo.java中对应位置。
   

   HttpClientDemo中引用以下类，可在“获取SDK”包中的“src”文件下查看：

   • Constant：demo中用到的常量。
   • SSLCipherSuiteUtil：tls认证配置参数的工具类，比如配置客户端不校验证书。
   • UnsupportProtocolException：异常处理类。

   public class HttpClientDemo {
       private static final Logger LOGGER = LoggerFactory.getLogger(HttpClientDemo.class);
       public static void main(String[] args) throws Exception {
           // Create a new request.
           Request httpClientRequest = new Request();
           try {
               // Set the request parameters.
               // AppKey, AppSecrect, Method and Url are required parameters.
               // Directly writing AK/SK in code is risky. For security, encrypt your AK/SK and store them in the configuration file or environment variables.
               // In this example, the AK/SK are stored in environment variables for identity authentication. 
               // Before running this example, set environment variables HUAWEICLOUD_SDK_AK and HUAWEICLOUD_SDK_SK.
               httpClientRequest.setKey(System.getenv("HUAWEICLOUD_SDK_AK"));
               httpClientRequest.setSecret(System.getenv("HUAWEICLOUD_SDK_SK"));
               httpClientRequest.setMethod("POST");
               // Set a request URL in the format of https://{Endpoint}/{URI}.
               httpClientRequest.setUrl("put your request url here");
               httpClientRequest.addHeader("Content-Type", "text/plain");
               // Set a body for http request.
               httpClientRequest.setBody("put your request body here");
           } catch (Exception e) {
               LOGGER.error(e.getMessage());
               return;
           }
           CloseableHttpClient client = null;
           try {
               // Sign the request.
               HttpRequestBase signedRequest = Client.sign(httpClientRequest, Constant.SIGNATURE_ALGORITHM_SDK_HMAC_SHA256);
               if (Constant.DO_VERIFY) {
                   // creat httpClient and verify ssl certificate
                   HostName.setUrlHostName(httpClientRequest.getHost());
                   client = (CloseableHttpClient) SSLCipherSuiteUtil.createHttpClientWithVerify(Constant.INTERNATIONAL_PROTOCOL);
               } else {
                   // creat httpClient and do not verify ssl certificate
                   client = (CloseableHttpClient) SSLCipherSuiteUtil.createHttpClient(Constant.INTERNATIONAL_PROTOCOL);
               }
               HttpResponse response = client.execute(signedRequest);
               // Print the body of the response.
               HttpEntity resEntity = response.getEntity();
               if (resEntity != null) {
                   LOGGER.info("Processing Body with name: {} and value: {}", System.getProperty("line.separator"),
                           EntityUtils.toString(resEntity, "UTF-8"));
               }
           } catch (Exception e) {
               LOGGER.error(e.getMessage());
           } finally {
               if (client != null) {
                   client.close();
               }
           }
       }
   }

2. 运行HttpClientDemo.java，对请求进行签名、访问API并打印结果。

   示例结果如下：

   [main] INFO com.huawei.apig.sdk.demo.HttpClientDemo - Print the authorization: [Authorization: SDK-HMAC-SHA256 Access=3afe0280a6e1466e9cb6f23bcccdba29, SignedHeaders=host;x-sdk-date, Signature=26b2abfa40a4acf3c38b286cb6cbd9f07c2c22d1285bf0d4f6cf1f02d3bfdbf6]
   [main] INFO com.huawei.apig.sdk.demo.HttpClientDemo - Print the status line of the response: HTTP/1.1 200 OK
   [main] INFO com.huawei.apig.sdk.demo.HttpClientDemo - Processing Header with name: Date and value: Fri, 26 Aug 2022 08:58:51 GMT
   [main] INFO com.huawei.apig.sdk.demo.HttpClientDemo - Processing Header with name: Content-Type and value: application/json
   [main] INFO com.huawei.apig.sdk.demo.HttpClientDemo - Processing Header with name: Transfer-Encoding and value: chunked
   [main] INFO com.huawei.apig.sdk.demo.HttpClientDemo - Processing Header with name: Connection and value: keep-alive
   [main] INFO com.huawei.apig.sdk.demo.HttpClientDemo - Processing Header with name: Server and value: api-gateway
   [main] INFO com.huawei.apig.sdk.demo.HttpClientDemo - Processing Header with name: X-Request-Id and value: 10955c5346b9512d23f3fd4c1bf2d181
   [main] INFO com.huawei.apig.sdk.demo.HttpClientDemo - Processing Body with name: 
    and value: {"200": "sdk success"}

   显示{"200": "sdk success"}，表示签名成功，API成功请求到后端。

   如果改变AK或SK的值，API网关将返回的错误信息error_msg。