web3j批量转账怎么实现

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使用web3j来连接geth并转账，基本转账函数可以这样写：

//以太坊转账    //from:转出方账户    //password:转出方密码    //addrTo:收款账户    //value:转账额    public  String transferEth(String from,String password,String to,BigInteger value) throws  Exception    {        EthGetTransactionCount ethGetTransactionCount = ethClient.ethGetTransactionCount(                from, DefaultBlockParameterName.LATEST).sendAsync().get();        BigInteger nonce = ethGetTransactionCount.getTransactionCount();       PersonalUnlockAccount personalUnlockAccount = ethClient.personalUnlockAccount(from,password).send();       if (personalUnlockAccount.accountUnlocked())        {            BigInteger gasPrice = Contract.GAS_PRICE;            BigInteger gasLimit = Contract.GAS_LIMIT.divide(new BigInteger("2"));            synchronized(TestLocal.class) {                Transaction transaction = Transaction.createEtherTransaction(from,nonce,gasPrice,gasLimit,to,value);                EthSendTransaction transactionResponse = ethClient.ethSendTransaction(transaction).sendAsync().get();;                if(transactionResponse.hasError()){                    String message=transactionResponse.getError().getMessage();                    System.out.println("transaction failed,info:"+message);                    Utils.writeFile("F:/testErr.txt","transaction failed,info:"+message);                    return message;                }else{                    String hash=transactionResponse.getTransactionHash();                    System.out.println("transaction from "+from+" to "+to+" amount:"+value);                    SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");                    //writeFile("transaction from "+from+" to "+to+" amount:"+value+" time:"+df.format(new Date()));                    return  hash;                }            }         }        return null;    }

上面函数中，当转账失败，会将失败结果写入F:/testErr.txt中。

批量转账就是在for循环中连续调用上面这个函数进行转账，现在设置从addr0向addr1连续转账10次：

for(int i=0;i<10;i++){     transferEth(addr0,"123",addr1,Convert.toWei("1", Convert.Unit.ETHER).toBigInteger());}

先查询addr1的余额，有102.9110385个ether：

> web3.formwei(eth.getBalance(eth.accounts[1]))102.9110385

运行批量转账函数，会发现控制台报错：

查询余额，发现只转成功了一笔：

> web3.formwei(eth.getBalance(eth.accounts[1]))103.9110385

查看打印的错误信息textErr.txt：

可见失败了9笔交易，只有第一笔交易成功了。失败的信息是因为有交易重复。初步判断是nonce设置出问题了。对于单笔转账，nonce可以从区块链查询到，在for循环里，需要自己去递增nonce。

修改transferEth函数如下：

public  String transferEthWith(String from,String password,String to,BigInteger value) throws  Exception    {        EthGetTransactionCount ethGetTransactionCount = ethClient.ethGetTransactionCount(                from, DefaultBlockParameterName.LATEST).sendAsync().get();        BigInteger nonce = ethGetTransactionCount.getTransactionCount();        if(gNoce == null)            gNoce = nonce;        PersonalUnlockAccount personalUnlockAccount = ethClient.personalUnlockAccount(from,password).send();        if (personalUnlockAccount.accountUnlocked())        {            BigInteger gasPrice = Contract.GAS_PRICE;            BigInteger gasLimit = Contract.GAS_LIMIT.divide(new BigInteger("2"));            synchronized(TestLocal.class) {                Transaction transaction = Transaction.createEtherTransaction(from,gNoce,gasPrice,gasLimit,to,value);                gNoce = gNoce.add(new BigInteger("1"));                EthSendTransaction transactionResponse = ethClient.ethSendTransaction(transaction).sendAsync().get();;                if(transactionResponse.hasError()){                    String message=transactionResponse.getError().getMessage();                    System.out.println("transaction failed,info:"+message);                    Utils.writeFile("F:/testErr.txt","transaction failed,info:"+message);                    return message;                }else{                    String hash=transactionResponse.getTransactionHash();                    System.out.println("transaction from "+from+" to "+to+" amount:"+value);                    SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");                    //writeFile("transaction from "+from+" to "+to+" amount:"+value+" time:"+df.format(new Date()));                    return  hash;                }            }         }        return null;    }

查看geth的log信息，可以看到提交了多笔交易：

查询addr1的账户余额，从103变成113了，转账成功：

> web3.formwei(eth.getBalance(eth.accounts[1]))113.9110385

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