使用web3j调用OKC ER20合约示例

Jay

import org.web3j.contracts.eip20.generated.ERC20;
import org.web3j.crypto.Credentials;
import org.web3j.protocol.Web3j;
import org.web3j.protocol.core.methods.response.TransactionReceipt;
import org.web3j.protocol.http.HttpService;
import org.web3j.tx.RawTransactionManager;
import org.web3j.tx.gas.DefaultGasProvider;

import java.math.BigInteger;


public class Sample {

    static public void main(String[] args) throws Exception {
        // Connect Web3j to the Blockchain
        String rpcEndpoint = "https://exchaintestrpc.okex.org";
        Web3j web3j = Web3j.build(new HttpService(rpcEndpoint));

        // Prepare a wallet
        String pk = "your private key";

        Credentials credentials = Credentials.create(pk);

        String addr = credentials.getAddress();
        System.out.println("address: " + addr);

        RawTransactionManager txManager = new RawTransactionManager(web3j, credentials, Byte.valueOf(web3j.netVersion().send().getNetVersion()));

        // Load the USDT contract
        String contractAddress = "0xe579156f9decc4134b5e3a30a24ac46bb8b01281";
        ERC20 erc20 = ERC20.load(contractAddress, web3j, txManager, new DefaultGasProvider());


        String symbol = erc20.symbol().send();
        String name = erc20.name().send();
        BigInteger decimal = erc20.decimals().send();

        System.out.println("symbol: " + symbol);
        System.out.println("name: " + name);
        System.out.println("decimal: " + decimal.intValueExact());

        // transfer
        TransactionReceipt receipt = erc20.transfer("0x0db6b797e64666d4b36b13e5dc6fcd4661893ac8", new BigInteger("25")).send();
        System.out.println("Transaction hash: "+receipt.getTransactionHash());

        BigInteger balance1 = erc20.balanceOf(addr).send();
        System.out.println("balance (" + addr + ")="+balance1.toString());

        BigInteger balance2 = erc20.balanceOf("0x0db6b797e64666d4b36b13e5dc6fcd4661893ac8").send();
        System.out.println("balance (0x0db6b797e64666d4b36b13e5dc6fcd4661893ac8)="+balance2.toString());

        // approve
        TransactionReceipt receipt1 = erc20.approve("0x0db6b797e64666d4b36b13e5dc6fcd4661893ac8", new BigInteger("100000")).send();
        System.out.println("Transaction hash: "+receipt1.getTransactionHash());

        BigInteger approveAmt = erc20.allowance(addr,"0x0db6b797e64666d4b36b13e5dc6fcd4661893ac8").send();
        System.out.println("allowance (0x0db6b797e64666d4b36b13e5dc6fcd4661893ac8)="+approveAmt.toString());
    }
}

caoheike

你好麻烦问下
'package com.bigyoung.demo.test;

import org.web3j.crypto.Credentials;
import org.web3j.protocol.Web3j;
import org.web3j.protocol.core.methods.response.TransactionReceipt;
import org.web3j.protocol.http.HttpService;
import org.web3j.tx.RawTransactionManager;
import org.web3j.tx.gas.DefaultGasProvider;

import java.math.BigInteger;

/**

@program: telecom
@ClassName dalao
@description:
@author: zhuhongzheng
@create: 2023-01-05 21:42

@Version 1.0
**/
public class dalao {
static public void main(String[] args) throws Exception {
// Connect Web3j to the Blockchain
String rpcEndpoint = "https://exchaintestrpc.okex.org";
Web3j web3j = Web3j.build(new HttpService(rpcEndpoint));

// Prepare a wallet
String pk = "不適合發出來";

Credentials credentials = Credentials.create(pk);

String addr = credentials.getAddress();
System.out.println("address: " + addr);

RawTransactionManager txManager = new RawTransactionManager(web3j, credentials, Byte.valueOf(web3j.netVersion().send().getNetVersion()));

// Load the USDT contract

String contractAddress = "0xe579156f9decc4134b5e3a30a24ac46bb8b01281";
// String contractAddress = "0x382bB369d343125BfB2117af9c149795C6C65C50"; //字符串错
// String contractAddress = "0x1940206b58b1b13bc21c5ca74fba757c6454d832"; //字符串错
ERC20 erc20 = ERC20.load(contractAddress, web3j, txManager, new DefaultGasProvider());

// String symbol = erc20.symbol().send();
// String name = erc20.name().send();
// BigInteger decimal = erc20.decimals().send();
////
// System.out.println("symbol: " + symbol);
// System.out.println("name: " + name);
// System.out.println("decimal: " + decimal.intValueExact());

    // transfer

// TransactionReceipt receipt = erc20.transfer("0x0db6b797e64666d4b36b13e5dc6fcd4661893ac8", new BigInteger("25")).send();
// System.out.println("Transaction hash: "+receipt.getTransactionHash());
//
// BigInteger balance1 = erc20.balanceOf(addr).send();
// System.out.println("balance (" + addr + ")="+balance1.toString());
//
// BigInteger balance2 = erc20.balanceOf("0x0db6b797e64666d4b36b13e5dc6fcd4661893ac8").send();
// System.out.println("balance (0x0db6b797e64666d4b36b13e5dc6fcd4661893ac8)="+balance2.toString());
//
// // approve
// TransactionReceipt receipt1 = erc20.approve("0x0db6b797e64666d4b36b13e5dc6fcd4661893ac8", new BigInteger("100000")).send();
// System.out.println("Transaction hash: "+receipt1.getTransactionHash());
//
// BigInteger approveAmt = erc20.allowance(addr,"0x0db6b797e64666d4b36b13e5dc6fcd4661893ac8").send();
// System.out.println("allowance (0x0db6b797e64666d4b36b13e5dc6fcd4661893ac8)="+approveAmt.toString());
// BigInteger gp = BigInteger.valueOf(1);

    TransactionReceipt send = erc20.transferFrom("0xB034ea12751eEbA3049E419A52b1834b3Ca7883e", "0xc551dc4dd5a7b453bf38542413d9d0a037bb3bcd", new BigInteger("1000000000000000000")).send();
    System.out.println("allowance (0x0db6b797e64666d4b36b13e5dc6fcd4661893ac8)="+send.toString());
    System.out.println(send.getBlockHash());
}

}
'
麻烦问下对方地址已授权。okt也足够，我方也足够，转账提示：Error processing transaction request: insufficient funds: sender balance < tx gas cost (0.000000000000000000okt < 0.036900000000000000okt)

各位大神帮忙看看

caoheike

你好麻烦问下
'package com.bigyoung.demo.test;

import java.math.BigInteger;

/**

@program: telecom
@ClassName dalao
@description:
@author: zhuhongzheng
@create: 2023-01-05 21:42

// Prepare a wallet
String pk = "不適合發出來";

Credentials credentials = Credentials.create(pk);

String addr = credentials.getAddress();
System.out.println("address: " + addr);

RawTransactionManager txManager = new RawTransactionManager(web3j, credentials, Byte.valueOf(web3j.netVersion().send().getNetVersion()));

// Load the USDT contract

    // transfer

    TransactionReceipt send = erc20.transferFrom("0xB034ea12751eEbA3049E419A52b1834b3Ca7883e", "0xc551dc4dd5a7b453bf38542413d9d0a037bb3bcd", new BigInteger("1000000000000000000")).send();
    System.out.println("allowance (0x0db6b797e64666d4b36b13e5dc6fcd4661893ac8)="+send.toString());
    System.out.println(send.getBlockHash());
}

各位大神帮忙看看

caoheike

你好麻烦问下
'package com.bigyoung.demo.test;

import java.math.BigInteger;

/**

@program: telecom
@ClassName dalao
@description:
@author: zhuhongzheng
@create: 2023-01-05 21:42

// Prepare a wallet
String pk = "不適合發出來";

Credentials credentials = Credentials.create(pk);

String addr = credentials.getAddress();
System.out.println("address: " + addr);

RawTransactionManager txManager = new RawTransactionManager(web3j, credentials, Byte.valueOf(web3j.netVersion().send().getNetVersion()));

// Load the USDT contract

    // transfer

    TransactionReceipt send = erc20.transferFrom("0xB034ea12751eEbA3049E419A52b1834b3Ca7883e", "0xc551dc4dd5a7b453bf38542413d9d0a037bb3bcd", new BigInteger("1000000000000000000")).send();
    System.out.println("allowance (0x0db6b797e64666d4b36b13e5dc6fcd4661893ac8)="+send.toString());
    System.out.println(send.getBlockHash());
}

各位大神帮忙看看

caoheike

你好麻烦问下
'package com.bigyoung.demo.test;

import java.math.BigInteger;

/**

@program: telecom
@ClassName dalao
@description:
@author: zhuhongzheng
@create: 2023-01-05 21:42

// Prepare a wallet
String pk = "不適合發出來";

Credentials credentials = Credentials.create(pk);

String addr = credentials.getAddress();
System.out.println("address: " + addr);

RawTransactionManager txManager = new RawTransactionManager(web3j, credentials, Byte.valueOf(web3j.netVersion().send().getNetVersion()));

// Load the USDT contract

    // transfer

    TransactionReceipt send = erc20.transferFrom("0xB034ea12751eEbA3049E419A52b1834b3Ca7883e", "0xc551dc4dd5a7b453bf38542413d9d0a037bb3bcd", new BigInteger("1000000000000000000")).send();
    System.out.println("allowance (0x0db6b797e64666d4b36b13e5dc6fcd4661893ac8)="+send.toString());
    System.out.println(send.getBlockHash());
}

各位大神帮忙看看