ethjava / web3j-sample

web3j 样例程序

web3j-sample

web3 for java 样例程序 (基于web3j 3.6.0)
环境 idea maven
运行前提 需要有一个开启RPC或者IPC服务的以太坊节点

• QuickStart 快速开始

• AccountManager 账号相关接口

• TransactionClient eth转账相关接口

• TokenClient token代币相关查询及转账

• ColdWallet 冷钱包创建、交易

• TokenBalanceTask 批量token代币余额查询

• EthInfo 连接节点的相关信息接口

• Security 公钥私钥相关接口

• EthMnemonic 生成、导入助记词(需要比特币的jar包 可以查看pom.xml)

• Filter 新块、新交易相关监听

• ContractEvent 执行合约相关log监听

• DecodeMessage 加密后的交易数据解析

• IBAN 根据官方规则生成iban及付款二维码

• Calculate 在发布合约前计算合约地址，根据签名后的交易信息计算TxHash

• Solidity 合约类相关

• LinkToken Support 链克支持

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打赏 eth地址:0x248F272180db4D079443753336c5C847A080275c

博客Blog

web3j-sample's Issues

Failed to use SolSample.java

I trying to use SolSample with Ganache, my method is the same:

	private static void deploy() {
		Web3j web3j = Web3j.build(new HttpService(Environment.RPC_URL));
		Credentials credentials = Credentials.create("9797ab180fae3c9fa50c1b713beb5e08e012a303de04760349712dbcf6d497c1");//可以根据私钥生成
                System.out.println("Address: " + credentials.getAddress());
		RemoteCall<TokenERC20> deploy = TokenERC20.deploy(web3j, credentials,
				Convert.toWei("10", Convert.Unit.GWEI).toBigInteger(),
				BigInteger.valueOf(3000000),
				BigInteger.valueOf(5201314),
				"my token", "mt");
		try {
			TokenERC20 tokenERC20 = deploy.send();
			tokenERC20.isValid();
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

but, the error is:

Address: 0xf7e06fc2159da20efa1a5c3bfe3330445259314d java.lang.RuntimeException: java.lang.NoSuchMethodException: com.ethjava.sol.TokenERC20.<init>(java.lang.String, org.web3j.protocol.Web3j, org.web3j.crypto.Credentials, org.web3j.tx.gas.ContractGasProvider) at org.web3j.tx.Contract.deploy(Contract.java:359) at org.web3j.tx.Contract.deploy(Contract.java:396) at org.web3j.tx.Contract.lambda$deployRemoteCall$5(Contract.java:419) at org.web3j.protocol.core.RemoteCall.send(RemoteCall.java:30) at com.ethjava.sol.SolSample.deploy(SolSample.java:29) at com.ethjava.sol.SolSample.main(SolSample.java:15) Caused by: java.lang.NoSuchMethodException: com.ethjava.sol.TokenERC20.<init>(java.lang.String, org.web3j.protocol.Web3j, org.web3j.crypto.Credentials, org.web3j.tx.gas.ContractGasProvider) at java.base/java.lang.Class.getConstructor0(Class.java:3350) at java.base/java.lang.Class.getDeclaredConstructor(Class.java:2554) at org.web3j.tx.Contract.deploy(Contract.java:346) ... 5 more Exception in thread "main" java.lang.NullPointerException at org.web3j.tx.RawTransactionManager.<init>(RawTransactionManager.java:36) at org.web3j.tx.RawTransactionManager.<init>(RawTransactionManager.java:66) at org.web3j.tx.Contract.<init>(Contract.java:94) at com.ethjava.sol.TokenERC20.<init>(TokenERC20.java:75) at com.ethjava.sol.TokenERC20.load(TokenERC20.java:263) at com.ethjava.sol.SolSample.use(SolSample.java:41) at com.ethjava.sol.SolSample.main(SolSample.java:16) Command execution failed. org.apache.commons.exec.ExecuteException: Process exited with an error: 1 (Exit value: 1) at org.apache.commons.exec.DefaultExecutor.executeInternal(DefaultExecutor.java:404) at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:166) at org.codehaus.mojo.exec.ExecMojo.executeCommandLine(ExecMojo.java:764) at org.codehaus.mojo.exec.ExecMojo.executeCommandLine(ExecMojo.java:711) at org.codehaus.mojo.exec.ExecMojo.execute(ExecMojo.java:289) at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80) at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51) at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106) at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863) at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288) at org.apache.maven.cli.MavenCli.main(MavenCli.java:199) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289) at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415) at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)

合约内容能发一份吗？

多谢你的分享，希望看下你合约内容是怎么写的solidity...多谢。如果不方便公开可以单独发我邮箱[email protected],谢谢

我现在没有搭建节点，请问有可用的节点推荐吗

如题，这个功能刚刚上手，没有可用的节点，就无法测试，各位老铁有可用的节点推荐不

请问一下交易前算出txhash这个方法中的signeddata是怎么生成的

public class Calculate {
public static void main(String[] args) {
System.out.println(calculateContractAddress("0x6c0f49aF552F2326DD851b68832730CB7b6C0DaF".toLowerCase(), 294));

	String signedData = "0xf8ac8201518506fc23ac00830493e094fda023cea60a9f421d74ac49f9a015880a77dd7280b844a9059cbb000000000000000000000000b5dbd2e4093a501f1d1e645f04cef5815a1581d7000000000000000000000000000000000000000000000004c53ecdc18a6000001ca03d710f3c5aabde2733938c44c0b1448f96e760c030205562f59889557397faa4a007110abbcfa343381a2f713d6339d3fa751200f82cc2f06a4d1967b4eaf61d50";
	System.out.println(caculateTransactionHash(signedData));
}

token转账

转账的时候报这个错误，能帮忙看看是什么原因吗？

为什么同步发送交易也需要等待一段时间才会断开？

为什么同步发送交易也需要等待一段时间才会断开？

WalletUtils.generateFullNewWalletFile和WalletUtils.generateLightNewWalletFile有什么区别？

WalletUtils.generateFullNewWalletFile和WalletUtils.generateLightNewWalletFile有什么区别？

log监听中断问题

您好博主，我在试用log监听的时候，会发生监听中断，请问有中断重连的方案吗

我用maven项目导入web3，生成签名的时候signer information does not match signer information of other classes in the same package

Exception in thread "main" java.lang.SecurityException: class "org.bouncycastle.jcajce.provider.digest.BCMessageDigest"'s signer information does not match signer information of other classes in the same package
at java.lang.ClassLoader.checkCerts(ClassLoader.java:898)
at java.lang.ClassLoader.preDefineClass(ClassLoader.java:668)
at java.lang.ClassLoader.defineClass(ClassLoader.java:761)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at org.web3j.abi.FunctionEncoder.buildMethodId(FunctionEncoder.java:88)
at org.web3j.abi.FunctionEncoder.encode(FunctionEncoder.java:28)
at walletmanager.ETHTest.tranToken(ETHTest.java:448)
at walletmanager.ETHTest.main(ETHTest.java:76)

idea check out from version control 导入后，无法运行：Error: Could not find or load main class com.ethjava.QuickStart

idea check out from version control 导入后，无法运行：
Error: Could not find or load main class com.ethjava.QuickStart

请问，怎么操作呢？谢谢！

连接测试链ropsten 的时候用Admin查询账号和创建账号失败

感谢大神
admin = Admin.build(new HttpService("https://ropsten.infura.io/v3/9e0de0c5fdfb4349972e110119a***")); System.out.println(admin.toString()); createNewAccount("123456"); getAccountList();

连接测试链https://ropsten.infura.io/v3/9e0de0c5fdfb4349972e11***** 用Admin创建账号出现如下错误信息
Exception in thread "main" org.web3j.protocol.exceptions.ClientConnectionException: Invalid response received: 405; at org.web3j.protocol.http.HttpService.performIO(HttpService.java:116) at org.web3j.protocol.Service.send(Service.java:34) at org.web3j.protocol.core.Request.send(Request.java:71) at com.cl.AccountManager.getAccountList(AccountManager.java:50) at com.cl.AccountManager.main(AccountManager.java:25)
getAccountList也是同样的错误。如果是自己搭建的私链就好着。

ContractEvent:Invalid response received: okhttp3.internal.http.RealResponseBody@5b7a5baa

监听智能合约事件
节点:https://ropsten.infura.io/SkryPe4cRwPk**********
用成功的朋友吗？

查询代币余额出错

Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 0
at java.util.Collections$EmptyList.get(Collections.java:4454)
at com.ethjava.TokenClient.getTokenName(TokenClient.java:119)
at com.ethjava.TokenClient.main(TokenClient.java:52)

Invalid response received: okhttp3.internal.http.RealResponseBody@72967906

Exception in thread "main" rx.exceptions.OnErrorNotImplementedException: Invalid response received: okhttp3.internal.http.RealResponseBody@72967906
at rx.internal.util.InternalObservableUtils$ErrorNotImplementedAction.call(InternalObservableUtils.java:386)
at rx.internal.util.InternalObservableUtils$ErrorNotImplementedAction.call(InternalObservableUtils.java:383)
at rx.internal.util.ActionSubscriber.onError(ActionSubscriber.java:44)
at rx.observers.SafeSubscriber._onError(SafeSubscriber.java:153)
at rx.observers.SafeSubscriber.onError(SafeSubscriber.java:115)
at rx.Observable.subscribe(Observable.java:10249)
at rx.Observable.subscribe(Observable.java:10205)
at rx.Observable.subscribe(Observable.java:10010)
at com.ethjava.ContractEvent.main(ContractEvent.java:51)

多出出现相同bug，连接的是infura的节点 使用的是at com.ethjava.ContractEvent

geth创建了私有链上，使用创建账号方法createNewAccount（）创建账号返回却是null？

这些代码非常适合我这个新手，感谢作者的开源分享。世界因好人而美好！

还有我在我的geth私有链上
geth --datadir "E:\EthDBSpace\PrivChain" 创建了私有链，并发行了一定量的资产
并且创建有如下账号

然而我调用了geth --rpc --rpcaddr localhost --rpcport "8545" --syncmode "light" --datadir "E:\EthDBSpace\PrivChain" 想进入到我的私有链上用java打通注册账号
却返回了null值。

我的期望是理应返回一串地址值，但不知道错在那里？
我使用了如下教程来创建私有链
https://blog.csdn.net/weixin_40401264/article/details/78095222