如何利用自己的开发能力在国内创建数字藏品 ----如何在国内创建合约发行数字藏品（nft）

对于普通小白用户来说，发行nft，可能明白的只是找个opensea平台，上传自己的nft作品，那么对于程序员来说，如何开发一款nft合约，又如何将nft商品上链呢。

.首先国内的平台我们选择蚂蚁链平台，合法合规，前期准备工作如下：

（1）登录开放联盟链；

可以快读搭建自己的应用项目，搭建应用项目后获取到对应的应用id。

（2）准备开发nft项目并进行发行上链；

创建自己的nft并且发布上链包含以下几步：

1.初始化文件存证

2.上传文件

3.通知文件上传完成

4.获取文件存证状态

5.查询文件存证

下面通过java来实现

引入依赖：

<dependency>
    <groupId>cn.com.antcloud.api</groupId>
    <artifactId>antcloud-api-sdk</artifactId>
    <version>3.3.0</version>
</dependency>
    <dependency>
    <groupId>cn.com.antcloud.api</groupId>
    <artifactId>antcloud-api-appex</artifactId>
    <version>1.1.0</version>
    </dependency>
<!--可以选择其他的http client-->
<dependency>
    <groupId>com.mashape.unirest</groupId>
    <artifactId>unirest-java</artifactId>
    <version>1.4.9</version>
</dependency>

java版：

public static void main(String[] args) throws InterruptedException, IOException, UnirestException {
    String endpoint = "https://prodapigw.cloud.alipay.com";
    String accessKey = "开发者配置";
    String secretKey = "开发者配置";
    String instanceId = "appex";
    String fileAppDid = "应用id";
    AntFinTechProfile antFinTechProfile = AntFinTechProfile.getProfile(endpoint, accessKey, secretKey);
    AntFinTechApiClient antFinTechApiClient = new AntFinTechApiClient(antFinTechProfile);
    //1. init oss 地址
    InitSolutionFilenotaryRequest initSolutionFilenotaryRequest = new InitSolutionFilenotaryRequest(instanceId);
    initSolutionFilenotaryRequest.setAppDid(fileAppDid);
    InitSolutionFilenotaryResponse initSolutionFilenotaryResponse = antFinTechApiClient.execute(initSolutionFilenotaryRequest);
    System.out.println(JSON.toJSONString(initSolutionFilenotaryResponse));
    String fileNotaryId = initSolutionFilenotaryResponse.getFileNotaryId();
    //2.通过http PUT请求你上传文件
    HttpResponse<String> resp = Unirest.put(initSolutionFilenotaryResponse.getUrl())
            .header("Content-Type", null)
            .body(getBytesByFile("文件路径"))
            .asString();
 
    if (resp.getStatus()!=200) {
        //文件上传失败,此处可添加上传失败后的处理
        return;
    }else{
        System.out.println("文件上传成功！");
    }
    //3. 通知服务端完成上传,开始存证
    SyncSolutionFilenotaryRequest syncSolutionFilenotaryRequest = new SyncSolutionFilenotaryRequest(instanceId);
    syncSolutionFilenotaryRequest.setAppDid(fileAppDid);
    syncSolutionFilenotaryRequest.setFileNotaryId(fileNotaryId);
    SyncSolutionFilenotaryResponse syncSolutionFilenotaryResponse = antFinTechApiClient.execute(syncSolutionFilenotaryRequest);
    System.out.println(JSON.toJSONString(initSolutionFilenotaryResponse));
    if (!syncSolutionFilenotaryResponse.getAccepted()) {
        //存证被拒绝了，此处可自行添加被拒绝后的处理逻辑
        return;
    }
    //4.获取存证状态
    GetSolutionFilenotarystatusRequest getSolutionFilenotarystatusRequest = new GetSolutionFilenotarystatusRequest(instanceId);
    getSolutionFilenotarystatusRequest.setAppDid(fileAppDid);
    getSolutionFilenotarystatusRequest.setFileNotaryId(fileNotaryId);
    String txHash;
    //此处轮询查询状态接口获得异步存证是否成功的结果
    //实际代码中请自行处理轮询逻辑和超时逻辑
    while (true) {
        GetSolutionFilenotarystatusResponse getSolutionFilenotarystatusResponse = antFinTechApiClient.execute(getSolutionFilenotarystatusRequest);
        if (getSolutionFilenotarystatusResponse.getFinished()) {
            txHash = getSolutionFilenotarystatusResponse.getTxHash();
            System.out.println("完成存证交易hash为："+txHash);
            break;
        }
        Thread.sleep(3 * 1000);
    }
    //4.存证查询
    QuerySolutionFilenotaryRequest querySolutionFilenotaryRequest = new QuerySolutionFilenotaryRequest(instanceId);
    querySolutionFilenotaryRequest.setAppDid(fileAppDid);
    querySolutionFilenotaryRequest.setTxHash(txHash);
    QuerySolutionFilenotaryResponse querySolutionFilenotaryResponse = antFinTechApiClient.execute(querySolutionFilenotaryRequest);
    if (querySolutionFilenotaryResponse != null) {
        //不抛错且能够获得返回值即表示查询成功
        System.out.println("存证信息如下：");
        System.out.println("url :" + querySolutionFilenotaryResponse.getUrl());
        System.out.println("qrCodeUrl :" + querySolutionFilenotaryResponse.getQrCodeUrl());
        System.out.println("fileContentHash" + querySolutionFilenotaryResponse.getFileContentHash());
    }
}
 
//将文件转换成Byte数组
public static byte[] getBytesByFile(String pathStr) {
    File file = new File(pathStr);
    try {
        FileInputStream fis = new FileInputStream(file);
        ByteArrayOutputStream bos = new ByteArrayOutputStream(1000);
        byte[] b = new byte[1000];
        int n;
        while ((n = fis.read(b)) != -1) {
            bos.write(b, 0, n);
        }
        fis.close();
        byte[] data = bos.toByteArray();
        bos.close();
        return data;
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

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