使用geth发送交易

启动一个连接到节点的交互控制台，您可以参考文档开启geth交互控制台来建立一个交互控制台

创建一个以太坊账户，如果您已经在节点上创建了以太坊账户，可以使用已有账户完成后续操作

// create a account that use empty password
var account = personal.newAccount("");
// using an existing account in node
// var account = eth.accounts[0]
// unlock account for 300 seconds with empty password
personal.unlockAccount(account, "", 300);
// set it as default account
web3.eth.defaultAccount = account;

指定智能合约的地址和ABI，并发起调用。您可以参考部署智能合约中的步骤来部署智能合约，并获取智能合约的地址和ABI。

// your contract address that you want to call
var address = "0x0000000";
// your contarct ABI that address corresponds to
var abi = [{"constant":true,"inputs":[],"name":"storedData","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"x","type":"uint256"}],"name":"set","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"get","outputs":[{"name":"retVal","type":"uint256"}],"payable":false,"type":"function"},{"inputs":[{"name":"initVal","type":"uint256"}],"payable":false,"type":"constructor"}];
var contract = eth.contract(abi).at(address)
// call get method of demo contract
contract.get()
// call set method of demo contract, and create a new transaction
contract.set(999)