web3j批量转账
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分享个很受欢迎全网稀缺的互动教程：
- web3j，主要是针对java和android程序员围绕web3j库进行区块链以太坊开发的讲解。
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