springboot操作以太坊(eth),使用web3j,转账等
Posted 佛说今夜有雨
tags:
篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了springboot操作以太坊(eth),使用web3j,转账等相关的知识,希望对你有一定的参考价值。
开发以太坊prc客户端:
本次使用的是《MetaMask》钱包
1,安装node.js
2,安装ganache-cli,开启本地web3j的测试服务
安装命令:npm install -g ganache-cli
启动本地服务命令:ganache-cli -i 1 -h 0.0.0.0 -p 8545
启动成功同时生成是个测试账号,每个账号100eth,如图
然后再MetaMask钱包可以通过输入秘钥的方式添加账号,如图
3.springboot部分:
导入pom <dependency>
<groupId>org.web3j</groupId>
<artifactId>core</artifactId>
<version>5.0.0</version>
</dependency>
如果运行报错 (okhttp3.RequestBody.create(Ljava/lang/String;Lokhttp3/MediaType;)Lokhttp3/RequestBody)则添加pom
<dependency>
<groupId>com.squareup.okhttp3</groupId>
<artifactId>okhttp</artifactId>
<version>4.3.1</version>
</dependency>
创建web3j对象:
Web3j web3 = Web3j.build(new HttpService("http://localhost:8545/"));
4,已有metamask钱包的情况,没有metamask钱包,请先申请账号
public static void trade(Web3j web3) {
try {
//根据私钥创建身份信息
Credentials credentials = Credentials.create("0xa91514e0c5f1d5929b3052b756d07a0123ec5cf7b86188f4410033bdc99a85e7");
//转账
TransactionReceipt transactionReceipt = Transfer.sendFunds(
web3, credentials, "0xb425cEA579C1c2F7A902ec1aFB5d2bEE04A611eA",
BigDecimal.valueOf(1.0), Convert.Unit.ETHER).send();
System.out.println(transactionReceipt.getBlockHash());
} catch (IOException | CipherException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (TransactionException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
5,使用代码创建钱包
创建:
public static void createWallet() {
//存放钱包的位置,不需要文件名,会自动生成
String filePath = "G:/eth_wallet";
File f = new File(filePath);
try {//"l.1061326670"你钱包的密码
String fileName = WalletUtils.generateNewWalletFile("l.1061326670", f , false);
System.out.println(fileName);
Credentials credentials = WalletUtils.loadCredentials("l.1061326670", f);
System.out.println(credentials.getAddress());//钱包地址
System.out.println(credentials.getEcKeyPair().getPrivateKey());//私钥
System.out.println(credentials.getEcKeyPair().getPublicKey());//公钥
} catch (CipherException | IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvalidAlgorithmParameterException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchProviderException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
转账:
public static void tradeByOnlineWallet(Web3j web3) {
try {
String filePath = "G:/eth_wallet/***.json";
File f = new File(filePath);
Credentials credentials = WalletUtils.loadCredentials("l.1061326670", f);
TransactionReceipt transactionReceipt = Transfer.sendFunds(
web3, credentials, "0xb425cEA579C1c2F3A024ec1aFB5d2bEE04A611eA",
BigDecimal.valueOf(1.0), Convert.Unit.ETHER).send();
System.out.println(transactionReceipt.getBlockHash());
} catch (IOException | CipherException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (TransactionException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
以上是关于springboot操作以太坊(eth),使用web3j,转账等的主要内容,如果未能解决你的问题,请参考以下文章