This is the Java API which allows you to work with the CWV blockchain, without the additional overhead of having to write your own integration code for the platform.
Typically your application should depend on release versions of jsdk, Add the relevant dependency to your project:
<dependency>
<groupId>io.github.cryptoworldchain</groupId>
<artifactId>cwvj</artifactId>
<version>1.0.1</version>
</dependency>compile ('io.github.cryptoworldchain:cwvj:1.0.1')//the host of cwv blockchain node
Config.host = "http://localhost:8000";
/**Not required*/
/**Transaction hash query interval(milliseconds)*/
Config.HashTrackerIntervalTime = 300;
/**Transaction hash query retry times*/
Config.TxTrackRetryTimes = 10;To generate Mnemonic Words which is to generate keyPair with function getKeyPair :
String words= WalletUtil.getMnemonic();To generate KeyPair which consists of address,privateKey,publicKey :
KeyPairs kp = WalletUtil.getKeyPair(words);To generate KeyStore File Content ,with Mnemonic Words, which should be encrypted and written into the file :
String ksJson = WalletUtil.genKeyStoreFromMnemonic(words,"password");To restore Mnemonic Words from KeyStore content with correct password:
KeyPairs kp2 = WalletUtil.restoreFromKeyStore(ksJson,"password");
To get account info from an address:
String userInfo = HiChain.getUserInfo(address);
To send cwv or token to an address,from this :
String resultTransfer = HiChain.transferTo(address,prikey,"测试转账",
new ArrayList<TransferInfo>(){{
TransferInfo transferTo = new TransferInfo();
transferTo.setToAddr("fda8e7b96c92a9fd75ae77b87bf7fdb4cbaea0d5");
transferTo.setAmount("100"+"000000000000000000");
transferTo.setToken("AAA");
transferTo.setTokenAmount("10"+"000000000000000000");
this.add(transferTo);
}},null
); To get transaction content from transaction result:
TxContent txContentTokenCreate = HiChain.getTxContent(resultTransfer);
To create token :
String resultMETH2 = HiChain.tokenCreate(address,prikey,"METH2",100000000+"000000000000000000","create token test",null);To create a contract:
String binCode = "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";
String resultCreate = HiChain.contractCreate(address,prikey,binCode,"test create contract");
To execute a function to a contract address:
int fromIndex = resultCreate.indexOf("contractHash\": \"")+"contractHash\": \"".length();
String contractAddr = resultCreate.substring(fromIndex,resultCreate.indexOf("\"",fromIndex));
String abi = "[{\"constant\": true,\"inputs\": [],\"name\": \"value\",\"outputs\": [{\"name\": \"\",\"type\": \"uint256\"}],\"payable\": false,\"stateMutability\": \"view\",\"type\": \"function\"},{\"constant\": false,\"inputs\": [{\"name\": \"inc\",\"type\": \"uint256\"}],\"name\": \"valueInc\",\"outputs\": [{\"name\": \"\",\"type\": \"uint256\"}],\"payable\": false,\"stateMutability\": \"nonpayable\",\"type\": \"function\"},{\"constant\": true,\"inputs\": [],\"name\": \"getAddr\",\"outputs\": [{\"name\": \"\",\"type\": \"address\"}],\"payable\": false,\"stateMutability\": \"view\",\"type\": \"function\"},{\"inputs\": [],\"payable\": false,\"stateMutability\": \"nonpayable\",\"type\": \"constructor\"}]";
String functionBinCode = ContractUtil.getFunctionBinCode(abi,"valueInc",BigInteger.valueOf(1));
String resultValueInc = HiChain.contractCall(address, prikey, contractAddr, binCode, "test function valueInc", null);
Before calling the interface contractCall with a specific function, you should encode this function with or without its params by current method:
String functionBinCode = ContractUtil.getFunctionBinCode(abi,"valueInc",BigInteger.valueOf(1));To get encoded params of function, e.g. the params for constructor needs to be encoded without function name:
String addrMETH2 = ContractUtil.getTokenEncodeAddr("METH2");
String addrMOF2 = ContractUtil.getTokenEncodeAddr("MOF2");
Function f = ContractUtil.getFunctionWithMSwap(MSwapUtil.FunctionEnum.construtor);
String contructorParams = ContractUtil.getFunctionParamsCode(f,new BigInteger(addrMETH2,16),new BigInteger(addrMOF2, 16),new BigInteger[]{new BigInteger("fda8e7b96c92a9fd75ae77b87bf7fdb4cbaea0d5",16)});Generally speaking, transfer tokens need to pass in the token name, but if you want to transfer token in the contract, you should encode the token name, the result is same to an token address :
String addrMOF2 = ContractUtil.getTokenEncodeAddr("MOF2");To get the Swap Contract bin code :
String binCode = ContractUtil.getContractBinCodeMSwap();To get the function of Swap Contract :
Function f = ContractUtil.getFunctionWithMSwap(MSwapUtil.FunctionEnum.construtor);It calls the method getFunctionBinCode for Swap Contract
String binCode = ContractUtil.getFunctionBinCodeWithMSwap(MSwapUtil.FunctionEnum.initPool, new BigInteger(10000+"000000000000000000"),new BigInteger(20000+"000000000000000000"));