이 페이지는 영어로 된 기계 번역을 사용하므로 오류나 불명확한 언어가 포함될 수 있습니다. 가장 정확한 정보는 영어 원문을 참조하시기 바랍니다. 잦은 업데이트로 인해 일부 콘텐츠는 원래 영어로 되어 있을 수 있습니다. Crowdin에서 이 페이지의 번역을 개선하는 데 동참하여 도움을 주세요. (Crowdin translation page, Contributing guide)

Smart Contract Deploy

TxTypeSmartContractDeploy deploys a smart contract to the given address. The following changes will be made by this transaction type.

Import necessary classes from the Web3j and kaia libraries(web3j-ext).

Connect to the kaia blockchain using Web3j and specify the URL

Create KlayCredentials using the private key

Define gas price and gas limit for the transaction

Get the sender's address and current nonce

Define contract bytecode, you can get it from compiled solidity code

Get the chain ID from the Kaia network

Initialize variables for transaction parameters

Create a raw transaction

Sign the raw transaction using KlayRawTransaction.createTransaction

Send the transaction to kaia network

Get the transaction receipt and using the transaction hash

Shut down the Web3j connection

Decode the raw transaction to get the transaction type

SmartContractDeployExample.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.TxTypeSmartContractDeploy;

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 SmartContractDeployExample 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 = "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";

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

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

String to = null;

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

BigInteger value = BigInteger.ZERO;

BigInteger codeFormat = BigInteger.ZERO;

TxType.Type type = Type.SMART_CONTRACT_DEPLOY;

KlayRawTransaction raw = KlayRawTransaction.createTransaction(

type,

nonce,

GAS_PRICE,

GAS_LIMIT,

to,

value,

from,

payload,

codeFormat);

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();

TxTypeSmartContractDeploy rawTransaction = TxTypeSmartContractDeploy.decodeFromRawTransaction(signedMessage);

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

}

}

output

❯ java SmartContractDeployExample.java