hyperchain HVM使用java编写智能合约的编译、部署流程

新建合约项目

hvm的智能合约最好新建一个maven项目，一般通过模板来创建其中参数如下：
GroupId:cn.hyperchain
ArtifactId:java-contract-archetype
Version:1.0.2
项目中分为了两个部分：合约(SBank),调用接口(ISBank)
接口是提供给应用程序使用的

合约编译

使用命令：mvn compile
mvn jar
生成jar包即可部署

合约部署

直接读取jar包部署
代码如下

    DefaultHttpProvider defaultHttpProvider=new DefaultHttpProvider.Builder().setUrl(url).build();
    ProviderManager providerManager = ProviderManager.createManager(defaultHttpProvider);
    ContractService contractService = ServiceManager.getContractService(providerManager);
    AccountService accountService = ServiceManager.getAccountService(providerManager);
    Account account = accountService.genAccount(Algo.ECRAW);
    InputStream inputStream1 = new BufferedInputStream(new FileInputStream("target/TrainingPlatformContract-1.0-SNAPSHOT.jar"));
    Transaction transaction=new Transaction.HVMBuilder(account.getAddress())
            .deploy(inputStream1)
            .build();
    transaction.sign(account);
    ReceiptResponse receiptResponse = contractService.deploy(transaction).send().polling();
    String contractAddress = receiptResponse.getContractAddress();
    System.out.println("contract address: " + contractAddress);
    System.out.println("帐户地址:"+account.getAddress());
    System.out.println("账户私钥:" + account.getPrivateKey());

合约调用

首先每个方法需要在应用程序中编写一个InvokeBean类，举例:

public class InvokeTransfer implements BaseInvoke<Boolean, ISBank> {
    private String from;
    private String to;
    private int value;
    public InvokeTransfer(){

    }
    public InvokeTransfer(String from,String to,int value){
        this.from=from;
        this.to=to;
        this.value=value;
    }
...
}

调用代码：

        Transaction transaction1 = new Transaction.HVMBuilder(account.getAddress()).invoke(receiptResponse.getContractAddress(), new InvokeTransfer("1","2",1)).build();
        transaction1.sign(account);
        ReceiptResponse receiptResponse1 = contractService.invoke(transaction1).send().polling();
        System.out.println(receiptResponse1.getRet());