通过 Java 买卖Bitcoin

方案一: 通过ExinCore API进行币币交易

Exincore 提供了基于Mixin Network的币币交易API.

你可以支付USDT给ExinCore, ExinCore会以最低的价格，最优惠的交易费将你购买的比特币转给你, 每一币交易都是匿名的，并且可以在区块链上进行验证，交易的细节只有你与ExinCore知道！

ExinCore 也不知道你是谁，它只知道你的UUID.

预备知识:

你先需要创建一个机器人, 方法在 教程一.

安装依赖包

正如教程一里我们介绍过的， 我们需要依赖 mixin-java-sdk, 你应该先安装过它了， 这儿我们再安装其它的软件包.

下载地址: mvnrepository

build.gradle.kts的dependencies区块，加入如下依赖的包：

implementation("com.google.guava:guava:27.0.1-jre")

implementation("commons-codec:commons-codec:1.11")

implementation("com.auth0:java-jwt:3.8.0")

compile(files("libs/mixin-java-sdk.jar"))

implementation("com.squareup.okhttp3:okhttp:3.12.1")

implementation("com.squareup.okio:okio:2.2.2")

implementation("com.google.code.gson:gson:2.8.5")

implementation("org.bouncycastle:bcprov-jdk16:1.46")

implementation("org.apache.commons:commons-csv:1.6")

implementation("org.msgpack:msgpack-core:0.8.16")

implementation("com.fasterxml.jackson.core:jackson-databind:2.9.8")

implementation("com.fasterxml.jackson.core:jackson-core:2.9.8")

implementation("org.jetbrains.kotlin:kotlin-stdlib:1.3.30")

充币到 Mixin Network, 并读出它的余额.

通过ExinCore API, 可以进行BTC, USDT, EOS, ETH 等等交易， 此处演示用 USDT购买BTC 或者 用BTC购买USDT。交易前，先检查一下钱包地址。

完整的步骤如下:

检查比特币或USDT的余额，钱包地址。并记下钱包地址。

从第三方交易所或者你的冷钱包中，将币充到上述钱包地址。

再检查一下币的余额，看到帐与否。(比特币的到帐时间是5个区块的高度，约100分钟)。

比特币与USDT的充值地址是一样的。

private static final String BTC_ASSET_ID = "c6d0c728-2624-429b-8e0d-d9d19b6592fa";

private static final String EOS_ASSET_ID = "6cfe566e-4aad-470b-8c9a-2fd35b49c68d";

private static final String USDT_ASSET_ID = "815b0b1a-2764-3736-8faa-42d694fa620a";

MixinAPI mixinApiUser = generateAPI_FromCSV();

JsonObject asset = mixinApiUser.getAsset(BTC_ASSET_ID);

System.out.println(asset);

System.out.println("------------------------BTC------Information---------------------------");

System.out.println("The BTC wallet address is " + asset.get("public_key").getAsString());

System.out.println("The BTC wallet balance is " + asset.get("balance").getAsString());

System.out.println("-----------------------------------------------------------------------");

查询ExinCore市场的价格信息

如何来查询ExinCore市场的价格信息呢？你要先了解你交易的基础币是什么，如果你想买比特币，卖出USDT,那么基础货币就是USDT;如果你想买USDT,卖出比特币，那么基础货币就是比特币.

if ( input.equals("8") ) {

JsonArray res = FetchExinOneMarketInfos(USDT_ASSET_ID);

System.out.println("--exchange_asset--exchange_asset_symbol/base_asset_symbol--price--minimum--maximum--exchanges--");

// System.out.println(res);

res.forEach((element) -> {

JsonObject jsonObj = element.getAsJsonObject();

System.out.println(jsonObj.get("exchange_asset").getAsString() + " " +

jsonObj.get("exchange_asset_symbol").getAsString() + "/" +

jsonObj.get("base_asset_symbol").getAsString() + " " +

jsonObj.get("price").getAsString() + " " +

jsonObj.get("minimum_amount").getAsString() + " " +

jsonObj.get("maximum_amount").getAsString() + " " +

jsonObj.get("exchanges").getAsString() );

});

System.out.println("-----------------------------------------------------------------------");

}

private static JsonArray FetchExinOneMarketInfos(String url) {

OkHttpClient client = new OkHttpClient();

String baseUrl = "https://exinone.com/exincore/markets?base_asset=";

String fullUrl = baseUrl + url;

Request request = new Request.Builder()

.url(fullUrl)

.build();

try {

Response response = client.newCall(request).execute();

if (!response.isSuccessful()) {

throw new IOException("Unexpected code " + response);

}

return processJsonObjectWithDataOrError(response.body().string());

} catch(Exception e) { e.printStackTrace(); }

return null;

}

public static JsonArray processJsonObjectWithDataOrError(String res) {

JsonParser parser = new JsonParser();

JsonElement jsonTree = parser.parse(res);

if ( jsonTree.isJsonObject() ) {

if ( jsonTree.getAsJsonObject().get("data") != null ) {

return jsonTree.getAsJsonObject().get("data").getAsJsonArray();

}

}

return null;

}

交易前，创建一个Memo!

在第二章里,基于Mixin Network的 Java 比特币开发教程: 机器人接受比特币并立即退还用户, 我们学习过退还用户比特币，在这里，我们除了给ExinCore支付币外，还要告诉他我们想购买的币是什么，即将想购买的币存到memo里。

public static String encodeUUID(UUID uuid) {

try {

byte[] byteUuid = asBytes(uuid);

MessageBufferPacker packer = MessagePack.newDefaultBufferPacker();

packer.writePayload(byteUuid);

packer.close();

byte[] packedData = packer.toByteArray();

byte[] prex = { (byte)129, (byte)161, 65, (byte)196, 16 };

ByteArrayOutputStream output = new ByteArrayOutputStream();

output.write(prex);

output.write(packedData);

byte[] out = output.toByteArray();

return Base64.getEncoder().encodeToString(out);

} catch (Exception e) { e.printStackTrace(); }

return null;

}

币币交易的完整流程

转币给ExinCore时，将memo写入你希望购买的币，否则，ExinCore会直接退币给你！

如果你想卖出比特币买入USDT,调用方式如下：

private static final String EXIN_BOT = "61103d28-3ac2-44a2-ae34-bd956070dab1";

private static final String BTC_ASSET_ID = "c6d0c728-2624-429b-8e0d-d9d19b6592fa";

private static final String EOS_ASSET_ID = "6cfe566e-4aad-470b-8c9a-2fd35b49c68d";

private static final String USDT_ASSET_ID = "815b0b1a-2764-3736-8faa-42d694fa620a";

private static final String BTC_WALLET_ADDR = "14T129GTbXXPGXXvZzVaNLRFPeHXD1C25C";

private static final String MASTER_UUID = "0b4f49dc-8fb4-4539-9a89-fb3afc613747";

if ( input.equals("5") ) {

MixinAPI mixinApiUser = generateAPI_FromCSV();

UUID usdtUUID = UUID.fromString(USDT_ASSET_ID);

String memoTarget = encodeUUID(usdtUUID);

System.out.println("------------------------USDT-BTC-EXCHANGE----------------------------");

System.out.println(memoTarget);

JsonObject asset = mixinApiUser.getAsset(BTC_ASSET_ID);

System.out.println(asset);

System.out.println(asset.get("balance").getAsFloat());

if ( (asset.get("balance").getAsFloat() * 10000) >= 1 ) {

JsonObject transInfo = mixinApiUser.transfer(BTC_ASSET_ID, EXIN_BOT,

"0.0001",memoTarget);

System.out.println("------------------------BTC Transfer To EXCHANGE Information----------------------");

System.out.println(transInfo);

System.out.println("-----------------------------------------------------------------------");

} else System.out.println("-----------------------------------------------------------------------");

}

如果你想卖出USDT买入比特币,调用方式如下：

if ( input.equals("6") ) {

MixinAPI mixinApiUser = generateAPI_FromCSV();

UUID btcUUID = UUID.fromString(BTC_ASSET_ID);

String memoTarget = encodeUUID(btcUUID);

System.out.println(memoTarget);

System.out.println("-------------------------BTC-USDT-EXCHANGE----------------------------");

JsonObject asset = mixinApiUser.getAsset(BTC_ASSET_ID);

System.out.println(asset);

if ( asset.get("balance").getAsFloat() >= 1 ) {

JsonObject transInfo = mixinApiUser.transfer(USDT_ASSET_ID, EXIN_BOT,

"1",memoTarget);

System.out.println("------------------------USDT-BTC EXCHANGE Information----------------------");

System.out.println(transInfo);

System.out.println("-----------------------------------------------------------------------");

} else System.out.println("-----------------------------------------------------------------------");

}

交易完成后，Exincore会将你需要的币转到你的帐上，同样，会在memo里，记录成交价格，交易费用等信息！你只需要按下面的方式解开即可！

getSnapshots 读取钱包的交易记录。

if ( input.equals("7") ) {

MixinAPI mixinApiUser = generateAPI_FromCSV();

String transDatetime = "";

String assetUUID = "";

if ( mixinApiUser.getClientID().equals("091651f2-19c3-34f0-b45e-724ff203d921") ) {

transDatetime = "2019-04-19T06:53:22.593529Z";

assetUUID = USDT_ASSET_ID;

} else {

System.out.print("Input the transaction Date time (eg:2019-04-19T06:53:22.593529Z):");

transDatetime = System.console().readLine();

}

JsonArray snapshots = mixinApiUser.getSnapshots(assetUUID,3,transDatetime,"ASC");

// System.out.println(snapshots);

snapshots.forEach((element) -> {

JsonObject jsonObj = element.getAsJsonObject();

if ( jsonObj.get("amount").getAsFloat() > 0 && jsonObj.get("data") != null ) {

System.out.println(jsonObj.get("data").getAsString() );

try {

byte[] encoded = Base64.getDecoder().decode(jsonObj.get("data").getAsString());

MessageUnpacker unpacker = MessagePack.newDefaultUnpacker(encoded);

Value memoVal = unpacker.unpackValue();

if ( memoVal.isMapValue()) {

Map map = memoVal.asMapValue().map();

System.out.println(map.size());

if ( map.get(ValueFactory.newString("C")).asIntegerValue().asInt() == 1000 ) {

System.out.println("Exchange successful" + " Code: " +

map.get(ValueFactory.newString("C")).asIntegerValue());

System.out.println("Price is " + map.get(ValueFactory.newString("P")).asStringValue());

System.out.println("Fee is " + map.get(ValueFactory.newString("F")).asStringValue());

System.out.println("Type is " + map.get(ValueFactory.newString("T")).asStringValue());

ByteBuffer AssetBinValue = map.get(ValueFactory.newString("FA")).asRawValue().asByteBuffer();

System.out.println("Fee is asset UUID is " + ByteBufferAsUuid(AssetBinValue));

ByteBuffer TraceBinValue = map.get(ValueFactory.newString("O")).asRawValue().asByteBuffer();

System.out.println("The trace id is " + ByteBufferAsUuid(TraceBinValue));

}

}

} catch(Exception e) { e.printStackTrace(); }

}

});

}

一次成功的交易如下：

Make your choose(eg: q for Exit!): 7

7

-------------------------get-Snapshots---------------------------------------------

hqFDzQPooVCnNTIyNi4wM6FGqTAuMDAxMDQ1MqJGQcQQgVsLGidkNzaPqkLWlPpiCqFUoVKhT8QQPAsBVqKtQ5uS67M/ZTNleg==

Exchange successful Code: 1000

Price is 5226.03

Fee is 0.0010452

Type is R

Fee is asset UUID is 815b0b1a-2764-3736-8faa-42d694fa620a

The trace id is 3c0b0156-a2ad-439b-92eb-b33f6533657a

---------------------end-of-get-Snapshots---------------------------------------------

读取币的余额

通过读取币的余额，来确认交易情况！

MixinAPI mixinApiUser = generateAPI_FromCSV();

JsonObject asset = mixinApiUser.getAsset(BTC_ASSET_ID);

源代码执行

编译执行，即可开始交易了.

gradle build 编译项目.

java -cp 运行项目.

java -cp .:build/libs/bitcoin_wallet-java.jar:libs/* bitcoin_wallet.java.App

注意：不能使用gradle run来运行，因为我们使用的System.console().readLine()不被Gradle支持，只能使用java -cp

来运行！

本代码执行时的命令列表:

1: Create Bitcoin Wallet and update PIN

2: Read Bitcoin balance & address

3: Read USDT balance & address

4: Read EOS balance & address

tbb:Transfer BTC from Bot to Wallet

tbm:Transfer BTC from Wallet to Master

teb:Transfer EOS from Bot to Wallet

tem:Transfer EOS from Wallet to Master

tub:Transfer USDT from Bot to Wallet

tum:Transfer USDT from Wallet to Master

5: pay 0.0001 BTC buy USDT

6: pay $1 USDT buy BTC

7: Read Snapshots

8: Fetch market price(USDT)

9: Fetch market price(BTC)

v: Verify Wallet Pin

wb: Withdraw BTC

we: WitchDraw EOS

a: Read All Assets Infos

q: Exit

Make your choose(eg: q for Exit!):

Solution Two: List your order on Ocean.One exchange