如何使用 java 使用 ABI 解碼輸入數據？

npm ethereum-input-data-decoder上有一個工具。是的，我可以將輸入數據讀取為十六進制

byte[] bytes = Hex.decodeHex(transactionReceipt.getInput().substring(2).toCharArray());
System.out.println(new String(bytes, "UTF-8"));

但我需要結構化輸出。以json為例。我想用java來做。不是 npm

行！我解決了。

首先，我創建了自己的契約，它是從org.web3j.tx擴展****契約。重寫了兩個方法（我需要從合約接收多個值）：executeCallMultipleValueReturnAsync，executeCallMultipleValueReturn但與 Contract 中的內容相同，並創建了自己的 executeCall 方法，這與來自 web3j Contract 的私有executeCall相同，但不是將DefaultBlockParameterName.LATEST傳遞給 web3j。 ethCall 我正在傳遞新的 DefaultBlockParameterNumber(blockNumber)，所需的 blockNumber 為 BigInteger。所以這裡是：

   public class MyEthereumContract extends Contract {
   private String contractAddress;
   private BigInteger blockNumber;

   protected MyEthereumContract(String contractBinary, String contractAddress, Web3j web3j,
                              TransactionManager transactionManager, BigInteger gasPrice, BigInteger gasLimit) {
       super(contractBinary, contractAddress, web3j, transactionManager, gasPrice, gasLimit);
   }

   protected MyEthereumContract(String contractBinary, String contractAddress, Web3j web3j, Credentials credentials,
                              BigInteger gasPrice, BigInteger gasLimit) {
       super(contractBinary, contractAddress, web3j, credentials, gasPrice, gasLimit);
   }

   protected MyEthereumContract(String contractBinary, String contractAddress, Web3j web3j, Credentials credentials,
                              BigInteger gasPrice, BigInteger gasLimit,
                              BigInteger blockNumber) {
       super(contractBinary, contractAddress, web3j, credentials, gasPrice, gasLimit);
       this.contractAddress = contractAddress;
       this.blockNumber = blockNumber;
   }

   @Override
   protected CompletableFuture<List<Type>> executeCallMultipleValueReturnAsync(Function function) {
       return Async.run(() -> executeCallMultipleValueReturn(function));
   }

   @Override
   protected List<Type> executeCallMultipleValueReturn(
           Function function) throws InterruptedException, ExecutionException {
       return executeCall(function);
   }

   private List<Type> executeCall(
           Function function) throws InterruptedException, ExecutionException {
       String encodedFunction = FunctionEncoder.encode(function);

       org.web3j.protocol.core.methods.response.EthCall ethCall = web3j.ethCall(
               Transaction.createEthCallTransaction(
                       transactionManager.getFromAddress(), contractAddress, encodedFunction),
               new DefaultBlockParameterNumber(blockNumber))
               .sendAsync().get();

       String value = ethCall.getValue();
       return FunctionReturnDecoder.decode(value, function.getOutputParameters());
   }
}

比我添加新的建構子到類，從契約生成，我從載入方法呼叫

引用自：https://ethereum.stackexchange.com/questions/24538