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Smart Contract Execution

TxTypeSmartContractExecution 使用給定數據執行智能合約。 只有當 "to "是智能合約賬戶時，才接受TxTypeSmartContractExecution。

從 Web3j 和 kaia 庫（web3j-ext）中導入必要的類。

使用 Web3j 連接到 kaia 區塊鏈並指定 URL

使用私鑰創建 KlayCredentials

確定交易的gas價格和gas限額

獲取發件人的地址和暱稱

定義將發送到區塊鏈的合約數據

從 Kaia 網絡獲取鏈 ID

為交易參數初始化變量

創建新交易

簽署交易

將交易發送到 kaia 網絡。

獲取交易收據並使用交易哈希值

關閉 Web3j 實例

解碼原始交易以獲取交易類型

SmartContractExecutionExample.java

package org.web3j.example.transactions;

import java.io.IOException;

import java.math.BigInteger;

import org.web3j.crypto.KlayCredentials;

import org.web3j.crypto.KlayRawTransaction;

import org.web3j.crypto.KlayTransactionEncoder;

import org.web3j.crypto.transaction.type.TxType;

import org.web3j.crypto.transaction.type.TxTypeSmartContractExecution;

import org.web3j.crypto.transaction.type.TxType.Type;

import org.web3j.protocol.core.DefaultBlockParameterName;

import org.web3j.protocol.core.methods.response.EthChainId;

import org.web3j.protocol.core.methods.response.EthSendTransaction;

import org.web3j.protocol.http.HttpService;

import org.web3j.protocol.kaia.Web3j;

import org.web3j.utils.Numeric;

import org.web3j.protocol.kaia.core.method.response.TransactionReceipt;

import org.web3j.tx.response.PollingTransactionReceiptProcessor;

import org.web3j.tx.response.TransactionReceiptProcessor;

import org.web3j.example.keySample;

/**

*

*/

public class SmartContractExecutionExample implements keySample {

/**

*

*/

public static void run() throws Exception {

Web3j web3j = Web3j.build(new HttpService(keySample.BAOBAB_URL));

KlayCredentials credentials = KlayCredentials.create(keySample.LEGACY_KEY_privkey);

BigInteger GAS_PRICE = BigInteger.valueOf(50000000000L);

BigInteger GAS_LIMIT = BigInteger.valueOf(6721950);

String from = credentials.getAddress();

BigInteger nonce = web3j.ethGetTransactionCount(from, DefaultBlockParameterName.LATEST).send()

.getTransactionCount();

String data = "0xcfae3217";

EthChainId EthchainId = web3j.ethChainId().send();

long chainId = EthchainId.getChainId().longValue();

String to = "0xc58294ecde8fdb288fd845e7a43a56564b597bdb";

byte[] payload = Numeric.hexStringToByteArray(data);

BigInteger value = BigInteger.ZERO;

TxType.Type type = Type.SMART_CONTRACT_EXECUTION;

KlayRawTransaction raw = KlayRawTransaction.createTransaction(

type,

nonce,

GAS_PRICE,

GAS_LIMIT,

to,

value,

from,

payload);

byte[] signedMessage = KlayTransactionEncoder.signMessage(raw, chainId, credentials);

String hexValue = Numeric.toHexString(signedMessage);

EthSendTransaction transactionResponse = web3j.ethSendRawTransaction(hexValue).send();

System.out.println("TxHash : \n " + transactionResponse.getResult());

String txHash = transactionResponse.getResult();

int DEFAULT_POLLING_ATTEMPTS_PER_TX_HASH = 40;

int DEFAULT_BLOCK_TIME = 1 * 1000;

long DEFAULT_POLLING_FREQUENCY = DEFAULT_BLOCK_TIME;

TransactionReceiptProcessor transactionReceiptProcessor = new PollingTransactionReceiptProcessor(web3j,

DEFAULT_POLLING_FREQUENCY, DEFAULT_POLLING_ATTEMPTS_PER_TX_HASH);

org.web3j.protocol.core.methods.response.TransactionReceipt ethReceipt = transactionReceiptProcessor

.waitForTransactionReceipt(txHash);

System.out.println("Receipt from eth_getTransactionReceipt : \n" + ethReceipt);

TransactionReceipt receipt = web3j.klayGetTransactionReceipt(txHash).send().getResult();

System.out.println("Receipt from klay_getTransactionReceipt : \n" + receipt);

web3j.shutdown();

TxTypeSmartContractExecution rawTransaction = TxTypeSmartContractExecution

.decodeFromRawTransaction(signedMessage);

System.out.println("TxType : " + rawTransaction.getKlayType());

}

}

output

❯ java SmartContractExecutionExample.java

TxHash :

0xb04136d9704df78a49e54e9f9ae61df4d39dc5c249aba84bc1a4e4cdc64b00eb

receipt :

class TransactionReceipt {

blockHash: 0x8aee92edc199854646f999e094047da3a127d15473716c8dd40f42985a93be52

blockNumber: 0x8dea9cd

codeFormat: null

contractAddress: null

feePayer: null

feePayerSignatures: []

feeRatio: null

from: 0xa2a8854b1802d8cd5de631e690817c253d6a9153

gas: 0x66919e

effectiveGasPrice: 0x5d21dba00

gasPrice: 0xba43b7400

gasUsed: 0x5fe3

humanReadable: null

key: null

input: 0xcfae3217

logs: []

logsBloom: 0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

nonce: 0x3c2

senderTxHash: 0xb04136d9704df78a49e54e9f9ae61df4d39dc5c249aba84bc1a4e4cdc64b00eb

signature: []

status: 0x1

txError: null

to: 0xc58294ecde8fdb288fd845e7a43a56564b597bdb

transactionHash: 0xb04136d9704df78a49e54e9f9ae61df4d39dc5c249aba84bc1a4e4cdc64b00eb

transactionIndex: 0x1

type: TxTypeSmartContractExecution

typeInt: 48

value: 0x0

}

TxType : SMART_CONTRACT_EXECUTION