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Value Transfer Memo

TxTypeValueTransferMemo 用於用戶發送帶有特定信息的 KAIA。

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

使用私鑰創建發送方和付費方證書。

確定交易的gas價格和gas限額

從 credentials.getAddress() 獲取發件人地址

從 Kaia 網絡獲取鏈 ID

為交易參數初始化變量

創建原始事務對象。

使用 "KlayTransactionEncoder.signMessage "以**發送方的身份簽署交易。

使用 "KlayTransactionEncoder.signMessageAsFeePayer "將交易簽署為付費方。

向 kaia 網絡發送已簽署的交易

獲取交易收據

關閉 Web3j 實例

解碼原始交易以獲取交易類型

FeeDelegatedValueTransferMemo.java

package org.web3j.example.transactions;

import org.web3j.tx.response.PollingTransactionReceiptProcessor;

import org.web3j.tx.response.TransactionReceiptProcessor;

import org.web3j.example.keySample;

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.TxTypeFeeDelegatedValueTransferMemo;

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;

public class FeeDelegatedValueTransferMemoExample {

public static void run() throws Exception {

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

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

KlayCredentials credentials_feepayer = KlayCredentials.create(keySample.LEGACY_KEY_FEEPAYER_privkey);

BigInteger GAS_PRICE = BigInteger.valueOf(50000000000L);

BigInteger GAS_LIMIT = BigInteger.valueOf(6721950);

String from = credentials.getAddress();

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

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

String to = "0x000000000000000000000000000000000000dead";

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

.getTransactionCount();

BigInteger value = BigInteger.valueOf(100);

String data = "Kaia Web3j";

byte[] payload = data.getBytes();

TxType.Type type = Type.FEE_DELEGATED_VALUE_TRANSFER_MEMO;

KlayRawTransaction raw = KlayRawTransaction.createTransaction(

type,

nonce,

GAS_PRICE,

GAS_LIMIT,

to,

value,

from,

payload);

// Sign as sender

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

// Sign same message as Fee payer

signedMessage = KlayTransactionEncoder.signMessageAsFeePayer(raw, chainId, credentials_feepayer);

String hexValue = Numeric.toHexString(signedMessage);

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

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

String txHash = transactionResponse.getResult();

try {

Thread.sleep(2000);

} catch (Exception e) {

System.out.println(e);

}

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

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

web3j.shutdown();

TxTypeFeeDelegatedValueTransferMemo rawTransaction = TxTypeFeeDelegatedValueTransferMemo

.decodeFromRawTransaction(hexValue);

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

}

}

output

JAVA FeeDelegatedValueTransferMemo.java

輸出