java使用web3J进行代币转账、余额查询

 <!-- io常用工具类 --><dependency><groupId>commons-io</groupId><artifactId>commons-io</artifactId><version>2.5</version></dependency><dependency><groupId>org.web3j</groupId><artifactId>core</artifactId><version>3.2.0</version></dependency><dependency><groupId>org.web3j</groupId><artifactId>geth</artifactId><version>3.2.0</version></dependency><!-- web3j --><dependency><groupId>org.web3j</groupId><artifactId>web3j-spring-boot-starter</artifactId><version>1.6.0</version></dependency>

public static void main(String[] args) {/*SpringApplication.run(LongApplication.class, args);System.out.printf("启动成功");*/// 转出地址String from = "0x9175F9EcBbddC078e40C5e037AD31F4abf36628a";//转入地址String to = "0xa7B049d3A19796B195B0e976ec43EB7a12f07Bf9";//转入数量String value = "5";//转出地址私钥String privateKey ="";//合约地址String contractAddress="0x57E0297510fA155eF165646c208C495E563B3342";//位数，根据合约里面的来int decimal=4;tokenDeal(from,to,value,privateKey,contractAddress,decimal);}public static String tokenDeal(String from, String to, String value, String privateKey, String contractAddress, int decimal) {Web3j web3j = Web3j.build(new HttpService("https://ropsten.infura.io/v3/9aa3d95b3bc440fa88ea12eaa4456161"));try {//转账的凭证，需要传入私钥Credentials credentials = Credentials.create(privateKey);//获取交易笔数BigInteger nonce;EthGetTransactionCount ethGetTransactionCount = web3j.ethGetTransactionCount(from, DefaultBlockParameterName.PENDING).send();if (ethGetTransactionCount == null) {return null;}nonce = ethGetTransactionCount.getTransactionCount();//手续费BigInteger gasPrice;EthGasPrice ethGasPrice = web3j.ethGasPrice().sendAsync().get();if (ethGasPrice == null) {return null;}gasPrice = ethGasPrice.getGasPrice();//注意手续费的设置，这块很容易遇到问题BigInteger gasLimit = BigInteger.valueOf(60000L);BigInteger val = new BigDecimal(value).multiply(new BigDecimal("10").pow(decimal)).toBigInteger();// 单位换算Function function = new Function("transfer",Arrays.asList(new Address(to), new Uint256(val)),Collections.singletonList(new TypeReference<Type>() {}));//创建交易对象String encodedFunction = FunctionEncoder.encode(function);RawTransaction rawTransaction = RawTransaction.createTransaction(nonce, gasPrice, gasLimit,contractAddress, encodedFunction);//进行签名操作byte[] signMessage = TransactionEncoder.signMessage(rawTransaction, credentials);String hexValue = Numeric.toHexString(signMessage);//发起交易EthSendTransaction ethSendTransaction = web3j.ethSendRawTransaction(hexValue).sendAsync().get();String hash = ethSendTransaction.getTransactionHash();if (hash != null) {//执行业务System.out.printf("执行成功："+hash);return hash;}} catch (Exception ex) {//报错应进行错误处理ex.printStackTrace();}return null;}

查询余额

public static void main(String[] args) {//查询的钱包地址String from = "0x9175F9EcBbddC078e40C5e037AD31F4abf36628a";//合约地址String contractAddress="0x57E0297510fA155eF165646c208C495E563B3342";//合约部署节点Web3j web3j = Web3j.build(new HttpService("https://ropsten.infura.io/v3/9aa3d95b3bc440fa88ea12eaa4456161"));try {String code = getERC20Balance(web3j,from,contractAddress);System.out.printf("查询出来的余额："+code);} catch (ExecutionException e) {e.printStackTrace();} catch (InterruptedException e) {e.printStackTrace();}}private static final BigDecimal WEI = new BigDecimal(10000);/*** 获取ERC-20 token指定地址余额** @param address         查询地址* @param contractAddress 合约地址* @return* @throws ExecutionException* @throws InterruptedException*/public static String getERC20Balance(Web3j web3j, String address, String contractAddress) throws ExecutionException, InterruptedException {String methodName = "balanceOf";List<Type> inputParameters = new ArrayList<>();List<TypeReference<?>> outputParameters = new ArrayList<>();Address fromAddress = new Address(address);inputParameters.add(fromAddress);TypeReference<Uint256> typeReference = new TypeReference<Uint256>() {};outputParameters.add(typeReference);Function function = new Function(methodName, inputParameters, outputParameters);String data = FunctionEncoder.encode(function);Transaction transaction = Transaction.createEthCallTransaction(address, contractAddress, data);EthCall ethCall;BigDecimal balanceValue = BigDecimal.ZERO;try {ethCall = web3j.ethCall(transaction, DefaultBlockParameterName.LATEST).send();List<Type> results = FunctionReturnDecoder.decode(ethCall.getValue(), function.getOutputParameters());Integer value = 0;if(results != null && results.size()>0){value = Integer.parseInt(String.valueOf(results.get(0).getValue()));}balanceValue = new BigDecimal(value).divide(WEI, 6, RoundingMode.HALF_DOWN);} catch (IOException e) {e.printStackTrace();}return balanceValue.toString();}

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java使用web3J进行代币转账、余额查询

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