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更新时间：2024-10-17 GMT+08:00

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Java SDK

本章节介绍人脸识别服务Java SDK，您可以参考本章节进行快速集成开发。

准备工作

注册华为账号并开通华为云，并完成实名认证，账号不能处于欠费或冻结状态。
已开通人脸识别服务。如未开通，请登录人脸识别管理控制台开通所需服务。
已具备开发环境，支持Java JDK 1.8 及其以上版本。
登录“我的凭证 > 访问秘钥”页面，获取Access Key（AK）和Secret Access Key（SK）。
图1 获取AK、SK
登录“我的凭证”页面，获取“IAM用户名”、“账号名”以及待使用区域的“项目ID”。调用服务时会用到这些信息，请提前保存。
本样例以“华北-北京四”区域为例，获取对应的项目ID（project_id）。

图2 我的凭证

安装SDK

推荐您通过Maven方式获取和安装SDK，首先需要在您的操作系统中下载并安装Maven，安装完成后您只需要在Java项目的pom.xml文件中加入相应的依赖项即可。

使用SDK前，需要安装“huaweicloud-sdk-core”和“huaweicloud-sdk-frs”依赖项。请在SDK中心获取最新的sdk包版本，替换代码中版本。

<dependency>
    <groupId>com.huaweicloud.sdk</groupId>
    <artifactId>huaweicloud-sdk-core</artifactId>
    <version>3.1.12</version>
</dependency>
<dependency>
    <groupId>com.huaweicloud.sdk</groupId>
    <artifactId>huaweicloud-sdk-frs</artifactId>
    <version>3.1.12</version>
</dependency>

当出现第三方库冲突的时，如Jackson，okhttp3版本冲突等。可以引入如下bundle包(3.0.40-rc版本后)，该包包含所有支持的服务和重定向了SDK依赖的第三方软件，避免和业务自身依赖的库产生冲突：

<dependency>
    <groupId>com.huaweicloud.sdk</groupId>
    <artifactId>huaweicloud-sdk-bundle</artifactId>
    <version>[3.0.40-rc, 3.1.0)</version>
</dependency>

jackson版本要求请见pom.xml。SDK常见报错请参考代码运行报错、json解析报错。

开始使用

在开始使用之前，请确保您安装的是最新版本的SDK。使用过时的版本可能会导致兼容性问题或无法使用最新功能。您可以通过运行以下命令来检查SDK版本，并在SDK中心获取最新的SDK包版本。

mvn dependency:tree | grep huaweicloud-sdk-core
mvn dependency:tree | grep huaweicloud-sdk-frs

详细的SDK介绍，使用异步客户端，配置日志等操作请参见SDK中心、Java SDK使用指导、Java SDK使用视频。

导入依赖模块

import com.huaweicloud.sdk.core.auth.ICredential;
import com.huaweicloud.sdk.core.auth.BasicCredentials;
import com.huaweicloud.sdk.core.exception.ConnectionException;
import com.huaweicloud.sdk.core.exception.RequestTimeoutException;
import com.huaweicloud.sdk.core.exception.ServiceResponseException;

//导入v2版本sdk
import com.huaweicloud.sdk.frs.v2.region.FrsRegion;
import com.huaweicloud.sdk.frs.v2.*;
import com.huaweicloud.sdk.frs.v2.model.*;

配置认证信息
配置AK、SK信息。华为云通过AK识别用户的身份，通过SK对请求数据进行签名验证，用于确保请求的机密性、完整性和请求者身份的正确性。AK、SK获取方法请参见准备工作。
```
public static ICredential getCredential(String ak, String sk) {
    return new BasicCredentials()
            .withAk(ak)
            .withSk(sk);
}
```
初始化认证信息：
```
String ak = System.getenv("HUAWEICLOUD_SDK_AK");
String sk = System.getenv("HUAWEICLOUD_SDK_SK");
ICredential credential = getCredential(ak, sk);
```
- 认证用的 ak 和sk 硬编码到代码中或者明文存储都有很大的安全风险，建议在配置文件或者环境变量中密文存放，使用时解密，确保安全。
- 本示例以 ak 和 sk 保存在环境变量中来实现身份验证为例，运行本示例前请先在本地环境中设置环境变量HUAWEICLOUD_SDK_AK和HUAWEICLOUD_SDK_SK。
图3 Windows环境新建环境变量

初始化客户端

指定region方式

public static FrsClient getClient(Region region, ICredential auth) {
    // 初始化人脸识别服务的客户端
    FrsClient client = FrsClient.newBuilder()
            .withCredential(auth)
            .withRegion(FrsRegion.valueOf("cn-north-4")) // 选择服务所在区域 FrsRegion.valueOf("cn-north-4")
            .build();
    return client;
}

服务部署区域请参见终端节点。

发送请求并查看响应

// 以调用人脸检测 DetectFaceByBase64 接口为例
DetectFaceByBase64Request request = new DetectFaceByBase64Request();
FaceDetectBase64Req body = new FaceDetectBase64Req();
body.withImageBase64("/9j/4AAQSkZJRgABAQAAAQABAAD...");
request.withBody(body);
DetectFaceByBase64Response response = client.detectFaceByBase64(request);
System.out.println(response.toString());

使用人脸比对SDK时，image1、image2参数需为相同类型，即同为url、base64或file。

异常处理

表1 异常处理
一级分类	一级分类说明	二级分类	二级分类说明
ConnectionException	连接类异常	HostUnreachableException	网络不可达、被拒绝。
ConnectionException	连接类异常	SslHandShakeException	SSL认证异常。
RequestTimeoutException	响应超时异常	CallTimeoutException	单次请求，服务器处理超时未返回。
RequestTimeoutException	响应超时异常	RetryOutageException	在重试策略消耗完成后，仍无有效的响应。
ServiceResponseException	服务器响应异常	ServerResponseException	服务端内部错误，Http响应码：[500,]。
ServiceResponseException	服务器响应异常	ClientRequestException	请求参数不合法，Http响应码：[400, 500)

// 捕获和处理不同类型的异常
DetectFaceByBase64Request request = new DetectFaceByBase64Request();
try {
    DetectFaceByBase64Response response = client.detectFaceByBase64(request);
    System.out.println(response.toString());
} catch (ConnectionException e) {
    e.printStackTrace();
} catch (RequestTimeoutException e) {
    e.printStackTrace();
} catch (ServiceResponseException e) {
    e.printStackTrace();
    System.out.println(e.getHttpStatusCode());
    System.out.println(e.getErrorCode());
    System.out.println(e.getErrorMsg());
}

SDK demo 代码解析

人脸检测

// detect face by base64
DetectFaceByBase64Request detectRequest = new DetectFaceByBase64Request();
FaceDetectBase64Req faceDetectBase64Req = new FaceDetectBase64Req();
faceDetectBase64Req.withImageBase64("/9j/4AAQSkZJRgABAQAAAQABAAD...");
faceDetectBase64Req.withAttributes("2");
detectRequest.setBody(faceDetectBase64Req);
try {
    DetectFaceByBase64Response detectResponse = client.detectFaceByBase64(detectRequest);
    System.out.println(detectResponse.toString());
} catch (ConnectionException e) {
    e.printStackTrace();
} catch (RequestTimeoutException e) {
    e.printStackTrace();
} catch (ServiceResponseException e) {
    e.printStackTrace();
    System.out.println(e.getHttpStatusCode());
    System.out.println(e.getErrorCode());
    System.out.println(e.getErrorMsg());
}

// detect face by file
File file = new File("/root/picture.jpg");
DetectFaceByFileRequest byFileRequest = new DetectFaceByFileRequest();
DetectFaceByFileRequestBody requestBody = new DetectFaceByFileRequestBody();
try (InputStream inputStream = Files.newInputStream(file.toPath())){
    requestBody.withImageFile(inputStream, file.getName());
    byFileRequest.setBody(requestBody);
    DetectFaceByFileResponse response = client.detectFaceByFile(byFileRequest);
    System.out.println(response.toString());
} catch (ConnectionException e) {
    e.printStackTrace();
} catch (RequestTimeoutException e) {
    e.printStackTrace();
} catch (ServiceResponseException e) {
    e.printStackTrace();
    System.out.println(e.getHttpStatusCode());
    System.out.println(e.getErrorCode());
    System.out.println(e.getErrorMsg());
} catch (IOException e) {
    e.printStackTrace();
}

人脸比对

// compare face by base64
CompareFaceByBase64Request compareRequest = new CompareFaceByBase64Request();
FaceCompareBase64Req faceCompareBase64Req = new FaceCompareBase64Req();
faceCompareBase64Req.withImage1Base64("/9j/4AAQSkZJRgABAQAAAQABAAD...");
faceCompareBase64Req.withImage2Base64("/9j/4AAQSkZJRgABAQAAAQABAAD...");
compareRequest.withBody(faceCompareBase64Req);
try {
    CompareFaceByBase64Response compareResponse = client.compareFaceByBase64(compareRequest);
    System.out.println(compareResponse.toString());
} catch (ConnectionException e) {
    e.printStackTrace();
} catch (RequestTimeoutException e) {
    e.printStackTrace();
} catch (ServiceResponseException e) {
    e.printStackTrace();
    System.out.println(e.getHttpStatusCode());
    System.out.println(e.getErrorCode());
    System.out.println(e.getErrorMsg());
}

// compare face by file

File file1 = new File("/root/picture1.jpg");
File file2 = new File("/root/picture2.jpg");
try (InputStream inputStream1 = Files.newInputStream(file1.toPath());
    InputStream inputStream2 = Files.newInputStream(file2.toPath())) {
    CompareFaceByFileRequest request = new CompareFaceByFileRequest();
    CompareFaceByFileRequestBody requestBody = new CompareFaceByFileRequestBody();
    requestBody.withImage1File(inputStream1, file1.getName());
    requestBody.withImage2File(inputStream2, file2.getName());
    request.setBody(requestBody);
    CompareFaceByFileResponse response = client.compareFaceByFile(request);
    System.out.println(response.toString());
} catch (ConnectionException e) {
    e.printStackTrace();
} catch (RequestTimeoutException e) {
    e.printStackTrace();
} catch (ServiceResponseException e) {
    e.printStackTrace();
    System.out.println(e.getHttpStatusCode());
    System.out.println(e.getErrorCode());
    System.out.println(e.getErrorMsg());
} catch (IOException e) {
    e.printStackTrace();
}

人脸搜索

// search face by base64
SearchFaceByBase64Request searchRequest = new SearchFaceByBase64Request();
searchRequest.withFaceSetName("face_set_name");
FaceSearchBase64Req faceSearchBase64Req = new FaceSearchBase64Req();
List<Map<String, String>> listbodySort = new ArrayList<>();
Map<String, String> map = new HashMap<>();
map.put("timestamp","asc");
listbodySort.add(map);
List<String> listbodyReturnFields = new ArrayList<>();
listbodyReturnFields.add("timestamp");
listbodyReturnFields.add("id");
faceSearchBase64Req.withSort(listbodySort);
faceSearchBase64Req.withReturnFields(listbodyReturnFields);
faceSearchBase64Req.withImageBase64("/9j/4AAQSkZJRgABAQAAAQABAAD...");
searchRequest.withBody(faceSearchBase64Req);
try {
    SearchFaceByBase64Response searchResponse = client.searchFaceByBase64(searchRequest);
    System.out.println(searchResponse.toString());
} catch (ConnectionException e) {
    e.printStackTrace();
} catch (RequestTimeoutException e) {
    e.printStackTrace();
} catch (ServiceResponseException e) {
    e.printStackTrace();
    System.out.println(e.getHttpStatusCode());
    System.out.println(e.getErrorCode());
    System.out.println(e.getErrorMsg());
}

// search face by file
SearchFaceByFileRequest byFileRequest = new SearchFaceByFileRequest();
byFileRequest.withFaceSetName("face_set_name");
File file = new File("/root/picture.jpg");
try (InputStream inputStream = Files.newInputStream(file.toPath())) {
    SearchFaceByFileRequestBody fileRequestBody = new SearchFaceByFileRequestBody();
    fileRequestBody.withImageFile(inputStream, file.getName());
    byFileRequest.withBody(fileRequestBody);
    fileRequestBody.withSort("[{ \"timestamp\": \"desc\"}]");
    fileRequestBody.withReturnFields("[\"timestamp\"]");
    SearchFaceByFileResponse fileResponse = client.searchFaceByFile(byFileRequest);
    System.out.println(fileResponse.toString());
} catch (ConnectionException e) {
    e.printStackTrace();
} catch (RequestTimeoutException e) {
    e.printStackTrace();
} catch (ServiceResponseException e) {
    e.printStackTrace();
    System.out.println(e.getHttpStatusCode());
    System.out.println(e.getErrorCode());
    System.out.println(e.getErrorMsg());
} catch (IOException e) {
    e.printStackTrace();
}

创建人脸库

CreateFaceSetRequest createFaceSetRequest = new CreateFaceSetRequest();
CreateFaceSetReq createFaceSetReq = new CreateFaceSetReq();
createFaceSetReq.withFaceSetName("face_set_name");
Map<String, TypeInfo> stringTypeInfoMap = new HashMap<>();
TypeInfo typeInfo = new TypeInfo();
typeInfo.withType("long");
stringTypeInfoMap.put("timestamp", typeInfo);
createFaceSetReq.withExternalFields(stringTypeInfoMap);
createFaceSetRequest.withBody(createFaceSetReq);
try {
    CreateFaceSetResponse createFaceSetResponse = client.createFaceSet(createFaceSetRequest);
    System.out.println(createFaceSetResponse.toString());
} catch (ConnectionException e) {
    e.printStackTrace();
} catch (RequestTimeoutException e) {
    e.printStackTrace();
} catch (ServiceResponseException e) {
    e.printStackTrace();
    System.out.println(e.getHttpStatusCode());
    System.out.println(e.getErrorCode());
    System.out.println(e.getErrorMsg());
}

查询人脸库

ShowFaceSetRequest showFaceSetRequest = new ShowFaceSetRequest();
showFaceSetRequest.withFaceSetName("face_set_name");
try {
    ShowFaceSetResponse showFaceSetResponse = client.showFaceSet(showFaceSetRequest);
    System.out.println(showFaceSetResponse.toString());
} catch (ConnectionException e) {
    e.printStackTrace();
} catch (RequestTimeoutException e) {
    e.printStackTrace();
} catch (ServiceResponseException e) {
    e.printStackTrace();
    System.out.println(e.getHttpStatusCode());
    System.out.println(e.getErrorCode());
    System.out.println(e.getErrorMsg());
}

查询所有人脸库

ShowAllFaceSetsRequest showAllFaceSetsRequest = new ShowAllFaceSetsRequest();
try {
    ShowAllFaceSetsResponse showAllFaceSetsResponse = client.showAllFaceSets(showAllFaceSetsRequest);
    System.out.println(showAllFaceSetsResponse.toString());
} catch (ConnectionException e) {
    e.printStackTrace();
} catch (RequestTimeoutException e) {
    e.printStackTrace();
} catch (ServiceResponseException e) {
    e.printStackTrace();
    System.out.println(e.getHttpStatusCode());
    System.out.println(e.getErrorCode());
    System.out.println(e.getErrorMsg());
}

删除人脸库

DeleteFaceSetRequest deleteFaceSetRequest = new DeleteFaceSetRequest();
deleteFaceSetRequest.withFaceSetName("face_set_name");
try {
    DeleteFaceSetResponse deleteFaceSetResponse = client.deleteFaceSet(deleteFaceSetRequest);
    System.out.println(deleteFaceSetResponse.toString());
} catch (ConnectionException e) {
    e.printStackTrace();
} catch (RequestTimeoutException e) {
    e.printStackTrace();
} catch (ServiceResponseException e) {
    e.printStackTrace();
    System.out.println(e.getHttpStatusCode());
    System.out.println(e.getErrorCode());
    System.out.println(e.getErrorMsg());
}

添加人脸

//add face by base64
AddFacesByBase64Request addFacesByBase64Request = new AddFacesByBase64Request();
addFacesByBase64Request.withFaceSetName("face_set_name");
AddFacesBase64Req addFacesBase64Req = new AddFacesBase64Req();
addFacesBase64Req.withExternalFields("{\"timestamp\":12}");
addFacesBase64Req.withImageBase64("9j/4AAQSkZJRgABAQAAAQABAAD...");
addFacesByBase64Request.withBody(addFacesBase64Req);
try {
    AddFacesByBase64Response addFacesByBase64Response = client.addFacesByBase64(addFacesByBase64Request);
    System.out.println(addFacesByBase64Response.toString());
} catch (ConnectionException e) {
    e.printStackTrace();
} catch (RequestTimeoutException e) {
    e.printStackTrace();
} catch (ServiceResponseException e) {
    e.printStackTrace();
    System.out.println(e.getHttpStatusCode());
    System.out.println(e.getErrorCode());
    System.out.println(e.getErrorMsg());
}

//add face by file
AddFacesByFileRequest fileRequest = new AddFacesByFileRequest();
fileRequest.withFaceSetName("face_set_name");
AddFacesByFileRequestBody fileRequestBody = new AddFacesByFileRequestBody();
File file = new File("/root/picture.jpg");
try (InputStream inputStream = Files.newInputStream(file.toPath())) {
    fileRequestBody.withImageFile(inputStream, file.getName());
    fileRequestBody.setExternalFields("{\"id\": \"zhangsan\"}");
    fileRequest.withBody(fileRequestBody);
    AddFacesByFileResponse fileResponse = client.addFacesByFile(fileRequest);
    System.out.println(fileResponse.toString());
} catch (ConnectionException e) {
    e.printStackTrace();
} catch (RequestTimeoutException e) {
    e.printStackTrace();
} catch (ServiceResponseException e) {
    e.printStackTrace();
    System.out.println(e.getHttpStatusCode());
    System.out.println(e.getErrorCode());
    System.out.println(e.getErrorMsg());
} catch (IOException e) {
    e.printStackTrace();
}

删除人脸

//delete face by faceId
DeleteFaceByFaceIdRequest deleteFaceByFaceIdRequest = new DeleteFaceByFaceIdRequest();
deleteFaceByFaceIdRequest.withFaceSetName("face_set_name");
deleteFaceByFaceIdRequest.withFaceId("iexEBb6t");
try {
    DeleteFaceByFaceIdResponse deleteFaceByFaceIdResponse = client.deleteFaceByFaceId(deleteFaceByFaceIdRequest);
    System.out.println(deleteFaceByFaceIdResponse.toString());
} catch (ConnectionException e) {
    e.printStackTrace();
} catch (RequestTimeoutException e) {
    e.printStackTrace();
} catch (ServiceResponseException e) {
    e.printStackTrace();
    System.out.println(e.getHttpStatusCode());
    System.out.println(e.getErrorCode());
    System.out.println(e.getErrorMsg());
}

//delete face by externalImageId
DeleteFaceByExternalImageIdRequest deleteFaceRequest = new DeleteFaceByExternalImageIdRequest();
deleteFaceRequest.withFaceSetName("face_set_name");
deleteFaceRequest.withExternalImageId("iexEBb6t");
try {
    DeleteFaceByExternalImageIdResponse response = client.deleteFaceByExternalImageId(deleteFaceRequest);
    System.out.println(response.toString());
} catch (ConnectionException e) {
    e.printStackTrace();
} catch (RequestTimeoutException e) {
    e.printStackTrace();
} catch (ServiceResponseException e) {
    e.printStackTrace();
    System.out.println(e.getHttpStatusCode());
    System.out.println(e.getErrorCode());
    System.out.println(e.getErrorMsg());
}

批量删除人脸

BatchDeleteFacesRequest batchDeleteFacesRequest = new BatchDeleteFacesRequest();
batchDeleteFacesRequest.withFaceSetName("face_set_name");
DeleteFacesBatchReq deleteFacesBatchReq = new DeleteFacesBatchReq();
deleteFacesBatchReq.withFilter("age:[20 TO 30]");
batchDeleteFacesRequest.withBody(deleteFacesBatchReq);
try {
    BatchDeleteFacesResponse batchDeleteFacesResponse = client.batchDeleteFaces(batchDeleteFacesRequest);
    System.out.println(batchDeleteFacesResponse.toString());
} catch (ConnectionException e) {
    e.printStackTrace();
} catch (RequestTimeoutException e) {
    e.printStackTrace();
} catch (ServiceResponseException e) {
    e.printStackTrace();
    System.out.println(e.getHttpStatusCode());
    System.out.println(e.getErrorCode());
    System.out.println(e.getErrorMsg());
}

示例中filter参数为string类型，用于过滤接口返回的结果信息，例如 age:[20 TO 30] 表示只返回20至30岁之间的人脸信息。

更新人脸

UpdateFaceRequest updateFaceRequest = new UpdateFaceRequest();
updateFaceRequest.withFaceSetName("face_set_name");
UpdateFaceReq updateFaceReq = new UpdateFaceReq();
updateFaceReq.withFaceId("iexEBb6t");
updateFaceRequest.withBody(updateFaceReq);
try {
    UpdateFaceResponse response = client.updateFace(updateFaceRequest);
    System.out.println(response.toString());
} catch (ConnectionException e) {
    e.printStackTrace();
} catch (RequestTimeoutException e) {
    e.printStackTrace();
} catch (ServiceResponseException e) {
    e.printStackTrace();
    System.out.println(e.getHttpStatusCode());
    System.out.println(e.getErrorCode());
    System.out.println(e.getErrorMsg());
}

查询人脸

//show faces by faceId
ShowFacesByFaceIdRequest showFacesByFaceIdRequest = new ShowFacesByFaceIdRequest();
showFacesByFaceIdRequest.withFaceSetName("face_set_name");
showFacesByFaceIdRequest.withFaceId("iexEBb6t");
try {
    ShowFacesByFaceIdResponse response = client.showFacesByFaceId(showFacesByFaceIdRequest);
    System.out.println(response.toString());
} catch (ConnectionException e) {
    e.printStackTrace();
} catch (RequestTimeoutException e) {
    e.printStackTrace();
} catch (ServiceResponseException e) {
    e.printStackTrace();
    System.out.println(e.getHttpStatusCode());
    System.out.println(e.getErrorCode());
    System.out.println(e.getErrorMsg());
}

//show faces by limit
ShowFacesByLimitRequest showFacesByLimitRequest = new ShowFacesByLimitRequest();
showFacesByLimitRequest.withFaceSetName("face_set_name");
showFacesByLimitRequest.withOffset(0);
showFacesByLimitRequest.withLimit(10);
try {
    ShowFacesByLimitResponse showFacesByLimitResponse = client.showFacesByLimit(showFacesByLimitRequest);
    System.out.println(showFacesByLimitResponse.toString());
} catch (ConnectionException e) {
    e.printStackTrace();
} catch (RequestTimeoutException e) {
    e.printStackTrace();
} catch (ServiceResponseException e) {
    e.printStackTrace();
    System.out.println(e.getHttpStatusCode());
    System.out.println(e.getErrorCode());
    System.out.println(e.getErrorMsg());
}

动作活体检测

//detect live by base64
DetectLiveByBase64Request request = new DetectLiveByBase64Request();
LiveDetectBase64Req body = new LiveDetectBase64Req();
body.withActions("1,2,3,4");
body.withVideoBase64("/9j/4AAQSkZJRgABAQAAAQABAAD...");
request.withBody(body);
try {
    DetectLiveByBase64Response response = client.detectLiveByBase64(request);
    System.out.println(response.toString());
} catch (ConnectionException e) {
    e.printStackTrace();
} catch (RequestTimeoutException e) {
    e.printStackTrace();
} catch (ServiceResponseException e) {
    e.printStackTrace();
    System.out.println(e.getHttpStatusCode());
    System.out.println(e.getErrorCode());
    System.out.println(e.getErrorMsg());
}
//detect live by file
File file = new File("/root/video.mp4");
try (InputStream inputStream = Files.newInputStream(file.toPath())) {
    DetectLiveByFileRequest fileRequest = new DetectLiveByFileRequest();
    DetectLiveByFileRequestBody fileRequestBody = new DetectLiveByFileRequestBody();
    fileRequestBody.setActions("2");
    fileRequestBody.withVideoFile(inputStream, file.getName());
    fileRequest.withBody(fileRequestBody);
    DetectLiveByFileResponse byFileResponse = client.detectLiveByFile(fileRequest);
    System.out.println(byFileResponse.toString());
} catch (ConnectionException e) {
    System.out.println(e.toString());
} catch (RequestTimeoutException e) {
    System.out.println(e.toString());
} catch (ServiceResponseException e) {
    System.out.println(e.getErrorMsg());
} catch (IOException e) {
    e.printStackTrace();
}

静默活体检测

//detect live face by base64
DetectLiveFaceByBase64Request request = new DetectLiveFaceByBase64Request();
LiveDetectFaceBase64Req body = new LiveDetectFaceBase64Req();
body.withImageBase64("/9j/4AAQSkZJRgABAQAAAQABAAD...");
request.withBody(body);
try {
    DetectLiveFaceByBase64Response response = client.detectLiveFaceByBase64(request);
    System.out.println(response.toString());
} catch (ConnectionException e) {
    e.printStackTrace();
} catch (RequestTimeoutException e) {
    e.printStackTrace();
} catch (ServiceResponseException e) {
    e.printStackTrace();
    System.out.println(e.getHttpStatusCode());
    System.out.println(e.getErrorCode());
    System.out.println(e.getErrorMsg());
}

//detect live face by file
DetectLiveFaceByFileRequest fileRequest = new DetectLiveFaceByFileRequest();
DetectLiveFaceByFileRequestBody fileRequestBody = new DetectLiveFaceByFileRequestBody();
File file = new File("/root/picture.jpg");
try (InputStream inputStream = Files.newInputStream(file.toPath())) {
    fileRequestBody.withImageFile(inputStream, file.getName());
    fileRequest.withBody(fileRequestBody);
    DetectLiveFaceByFileResponse fileResponse = client.detectLiveFaceByFile(fileRequest);
    System.out.println(fileResponse.toString());
} catch (ConnectionException e) {
    e.printStackTrace();
} catch (RequestTimeoutException e) {
    e.printStackTrace();
} catch (ServiceResponseException e) {
    e.printStackTrace();
    System.out.println(e.getHttpStatusCode());
    System.out.println(e.getErrorCode());
    System.out.println(e.getErrorMsg());
} catch (IOException e) {
    e.printStackTrace();
}

OkHttp示例

如果使用OkHttp处理HTTP请求和响应，可参考以下代码（以人脸检测为例，其它接口示例可通过API Explorer获取）。

OkHttpClient client = new OkHttpClient().newBuilder()
    .build();
MediaType mediaType = MediaType.parse("text/plain");
RequestBody body = RequestBody.create(mediaType, "");
Request request = new Request.Builder()
    .url("https://face.cn-north-4.myhuaweicloud.com/v2/{project_id}/face-detect")
    .method("POST", body)
    .addHeader("Authorization", "<Your signed string>")
    .build();
Response response = client.newCall(request).execute();

SDK代码自动生成

API Explorer提供API检索及平台调试，支持全量快速检索、可视化调试、帮助文档查看和在线咨询。

您只需要在API Explorer中修改接口参数，即可自动生成对应的代码示例。同时，可在集成开发环境CloudIDE中完成代码的构建、调试和运行等操作。

图4 API Explorer
点击放大

代码运行报错

java.lang.NoClassDefFoundError: Could not initialize class com.huaweicloud.sdk.core.http.HttpConfig at com.huaweicloud.sdk.core.ClientBuilder.build(ClientBuilder.java:98)
HttpConfig 这个类在sdk-core 包里面找不到，造成原因为用户使用的sdk版本太老导致，建议使用最新版本的华为云java sdk，运行代码再具体定位。
java.lang.NoSuchFieldError: ALLOW_LEADING_DECIMAL_POINT_FOR_NUMBERS
这个字段是 jackson-core 里面用来标识解析json格式数据是否支持前导小数点的字段，这个报错的意思是找不到这个字段，很可能是因为用户使用的jackson 版本太老导致。

建议客户本地将jackson 版本升级到和华为云 java sdk一致，jackson版本要求请见pom.xml。

引用华为云java sdk的bundle包来解决 jackson 版本冲突的问题。
```
<dependency>
    <groupId>com.huaweicloud.sdk</groupId>
    <artifactId>huaweicloud-sdk-bundle</artifactId>
    <version>[3.0.40-rc, 3.1.0)</version>
</dependency>
```
java.lang.ClassNotFoundException: com.fasterxml.jackson.datatype.jsr310.JavaTimeModule
用户本地工程引入了jackson 框架，和华为云sdk引入的jackson 框架冲突了，导致会报找不到某个类，建议客户在本地引入bundle包报来避免出现依赖冲突。
```
<dependency>
    <groupId>com.huaweicloud.sdk</groupId>
    <artifactId>huaweicloud-sdk-bundle</artifactId>
    <version>[3.0.40-rc, 3.1.0)</version>
</dependency>
```
java.lang.ClassNotFoundException: okhttp3/Interceptor
用户本地引入的Okhttp3 版本和华为云冲突，okhttp版本要求请见pom.xml。
INFO com.huaweicloud.sdk.core.HcClient - project id of region 'cn-north-4' not found in BasicCredentials, trying to obtain project id from IAM service: https://iam.myhuaweicloud.com
调用服务对应终端节点下的项目ID没有生成。

在“我的凭证”页面中查看对应终端节点的项目ID，确认系统中没有生成。在FRS控制台将终端节点切换至调用服务所在的终端节点，之后前往“我的凭证”页面，即可查看到已生成对应的项目ID。

json解析报错

图5 json parse error
点击放大

服务端返回的数据格式不符合json格式，导致sdk侧解析json数据报错。
服务端返回的json 数据不符合json反序列化的规则，和sdk定义的数据结构不一致，导致反序列化失败。
sdk json 数据解析问题。

建议排查服务端返回的数据是否和服务SDK设计的结构、字段一致。

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