Web3j - 發送 erc20 令牌

我想問一下如何正確地將 ERC20 代幣從一個錢包發送到另一個錢包，以下是我的程式碼：

public static void main(String[] args) throws Exception {
   Web3j web3 = Web3j.build(new HttpService()); // defaults to http://localhost:8545/
   Web3ClientVersion web3ClientVersion = web3.web3ClientVersion().send();
   String clientVersion = web3ClientVersion.getWeb3ClientVersion();
   Credentials creds = WalletUtils.loadCredentials("password",
           "path/to/wallet");
   EthGetBalance ethGetBalance = web3.ethGetBalance(creds.getAddress(), DefaultBlockParameterName.LATEST)
           .sendAsync().get();

   BigInteger wei = ethGetBalance.getBalance();

   FixedSupplyToken_sol_FixedSupplyToken contract = FixedSupplyToken_sol_FixedSupplyToken
           .load("0x<CONTRACT_ADDRESS>", web3, creds, gasPrice, gasLimit);

   BigInteger tokenAmount = contract.balanceOf(creds.getAddress()).send();

   contract.transfer("0x<TO_ADDRESS>", new BigInteger("10000")).send();
}

當我嘗試執行此程式碼時，它的工作，交易被送出到我的私人網路，但它返回這些錯誤。

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Exception in thread "main" org.web3j.protocol.exceptions.TransactionException: Error processing request: unknown transaction
   at org.web3j.tx.response.TransactionReceiptProcessor.sendTransactionReceiptRequest(TransactionReceiptProcessor.java:32)
   at org.web3j.tx.response.PollingTransactionReceiptProcessor.getTransactionReceipt(PollingTransactionReceiptProcessor.java:37)
   at org.web3j.tx.response.PollingTransactionReceiptProcessor.waitForTransactionReceipt(PollingTransactionReceiptProcessor.java:29)
   at org.web3j.tx.TransactionManager.processResponse(TransactionManager.java:72)
   at org.web3j.tx.TransactionManager.executeTransaction(TransactionManager.java:51)
   at org.web3j.tx.ManagedTransaction.send(ManagedTransaction.java:70)
   at org.web3j.tx.Contract.executeTransaction(Contract.java:223)
   at org.web3j.tx.Contract.executeTransaction(Contract.java:207)
   at org.web3j.tx.Contract.executeTransaction(Contract.java:201)
   at org.web3j.tx.Contract.lambda$executeRemoteCallTransaction$3(Contract.java:240)
   at org.web3j.protocol.core.RemoteCall.send(RemoteCall.java:30)
   at com.gio.myapp.App.main(App.java:50)

我在這裡錯過了什麼嗎？

您可以使用以下功能手動編碼數據：

public static String encodeTransferData(String toAddress, BigInteger sum) {
   Function function = new Function(
           "transfer",  // function we're calling
           Arrays.asList(new Address(toAddress), new Uint256(sum)),  // Parameters to pass as Solidity Types
           Arrays.asList(new org.web3j.abi.TypeReference<Bool>() {}));
   return FunctionEncoder.encode(function);
}

並以這種方式呼叫契約：

public static void main(String[] args) throws Exception {
   Web3j web3 = Web3j.build(new HttpService()); // defaults to http://localhost:8545/    
   Credentials creds = WalletUtils.loadCredentials("password", "path/to/wallet");
   RawTransactionManager manager = new RawTransactionManager(web3, creds);
   String toAddress = "0x..."; // destination address
   String contractAddress = "0x...";
   BigInteger sum = BigInteger.valueOf(10000); // amount you want to send
   String data = encodeTransferData(toAddress, sum);
   BigInteger gasPrice = web3.ethGasPrice().send().getGasPrice();
   BigInteger gasLimit = BigInteger.valueOf(120000); // set gas limit here
   EthSendTransaction transaction = manager.sendTransaction(gasPrice, gasLimit, contractAddress, data, null);
}

這與在區塊鏈中找不到交易雜湊有關。

例如，嘗試在事務之後將事務雜湊輸出為字元串。

也嘗試更換線路

contract.transfer("0x<TO_ADDRESS>", new BigInteger("10000")).send();

和

contract.transfer("0x<TO_ADDRESS>", new BigInteger("10000")).sendAsync().get();

可以幫助您更明確地定位問題，甚至解決問題。

引用自：https://ethereum.stackexchange.com/questions/41366