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