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Eth.java
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Eth.java
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/**
*
*/
package whatsapp;
/**
* @author ICT
*
*/
import java.io.IOException;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.io.IOException;
import org.web3j.protocol.Web3j;
import org.web3j.protocol.http.HttpService;
import org.web3j.utils.Convert;
import org.web3j.utils.Convert.Unit;
import org.web3j.protocol.core.DefaultBlockParameterName;
import org.web3j.protocol.core.methods.response.EthBlockNumber;
import org.web3j.protocol.core.methods.response.EthGasPrice;
import org.web3j.protocol.core.methods.response.EthGetBalance;
import org.web3j.protocol.core.methods.response.EthGetTransactionCount;
import org.web3j.protocol.core.methods.response.Web3ClientVersion;
public class Eth {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("Connecting to Ethereum ...");
Web3j web3 = Web3j.build(new HttpService("http://127.0.0.1:8545"));
System.out.println("Successfuly connected to Ethereum");
try {
// web3_clientVersion returns the current client version.
Web3ClientVersion clientVersion = web3.web3ClientVersion().send();
//eth_blockNumber returns the number of most recent block.
EthBlockNumber blockNumber = web3.ethBlockNumber().send();
//eth_gasPrice, returns the current price per gas in wei.
EthGasPrice gasPrice = web3.ethGasPrice().send();
// Print result
System.out.println("Client version: " + clientVersion.getWeb3ClientVersion());
System.out.println("Block number: " + blockNumber.getBlockNumber());
System.out.println("Gas price: " + gasPrice.getGasPrice());
EthGetBalance balanceWei = web3.ethGetBalance("0x6cacb165f4ca32a537c772c9c68c5eeda1f830613c2c1d7fd810f70e3c6f554e", DefaultBlockParameterName.LATEST).send();
System.out.println("balance in wei: " + balanceWei);
BigDecimal balanceInEther = Convert.fromWei(balanceWei.getBalance().toString(), Unit.ETHER);
System.out.println("balance in ether: " + balanceInEther);
EthGetTransactionCount ethGetTransactionCount = web3.ethGetTransactionCount("0xF0f15Cedc719B5A55470877B0710d5c7816916b1", DefaultBlockParameterName.LATEST).send();
BigInteger nonce = ethGetTransactionCount.getTransactionCount();
System.out.println("Eth Transaction Count: " + nonce);
} catch(IOException ex) {
throw new RuntimeException("Error whilst sending json-rpc requests", ex);
}
}
}