Jonathan Cook
42 lines
1.4 KiB
Java
42 lines
1.4 KiB
Java
package com.baeldung.web3j;
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import com.baeldung.web3j.contracts.Greeting;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.web3j.crypto.Credentials;
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import org.web3j.crypto.WalletUtils;
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import org.web3j.protocol.Web3j;
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import org.web3j.protocol.core.methods.response.TransactionReceipt;
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import org.web3j.protocol.http.HttpService;
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import org.web3j.tx.Contract;
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import org.web3j.tx.ManagedTransaction;
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public class Template {
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private Logger l = LoggerFactory.getLogger(Template.class);
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private void deployContract() throws Exception{
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Web3j web3j = Web3j.build(new HttpService("https://rinkeby.infura.io/<your_token>"));
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Credentials credentials =
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WalletUtils.loadCredentials(
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"<password>",
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"/path/to/<walletfile>");
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Greeting contract = Greeting.deploy(
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web3j, credentials,
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ManagedTransaction.GAS_PRICE, Contract.GAS_LIMIT,
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"Hello blockchain world!").send();
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String contractAddress = contract.getContractAddress();
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l.debug("Smart contract deployed to address "+ contractAddress);
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l.debug("Value stored in remote smart contract: "+ contract.greet().send());
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TransactionReceipt transactionReceipt = contract.setGreeting("Well hello again").send();
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l.debug("New value stored in remote smart contract: "+ contract.greet().send());
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}
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}
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