web3j发交易和查询余额

var Web3 = require('web3');
var fs   = require('fs');
var Tx = require('ethereumjs-tx');
var store = require('./data.js')

var web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8866"));
//发布合约得到的合约地址
var contract_addr ="";
var data  ="";

//编译合约源码得到abi和data
let abi= JSON.parse(fs.readFileSync("./abi.txt"));
var USDT = new web3.eth.Contract(abi,contract_addr);

//发布合约
function deploy(){
	web3.eth.getTransactionCount(add_form,"pending",function(err,nonce){
		if(err){
			console.log("获取nonce出错",err);
			return;
		}
		console.log("获得nonce:",nonce);
		var rawTx = {
		    nonce:web3.utils.toHex(nonce),
			from: add_form,
			gasLimit: web3.utils.toHex(21000),
			gasPrice: web3.utils.toHex(web3.utils.toWei("15", "gwei")),
			data:data 

		}
		var tx = new Tx(rawTx);
		tx.sign(privateKey);
		var serializedTx = tx.serialize();
		web3.eth.sendSignedTransaction('0x' + serializedTx.toString('hex'),function(err, hash){
			if (!err) {
		        console.log(hash);
		    } else {
		        console.error(err);
		    }
		});
	});
}

//发送合约交易
function contractTransfer(amount,targetAddr){
	var transfer_code = USDT.methods.transfer(targetAddr, web3.utils.toWei(amount,'mwei')).encodeABI();
	web3.eth.getTransactionCount(add_form,"pending",function(err,nonce){
		if(err){
			console.log("获取nonce出错",err);
			return;
		}
		console.log("获得nonce:",nonce);
		var transfer_rawTx = {
			nonce:web3.utils.toHex(nonce),
			from: add_form,
			to: contract_addr,
			value: "0x0",
			gasLimit: web3.utils.toHex(60000),
			gasPrice: web3.utils.toHex(web3.utils.toWei("15", "gwei")),
			data:transfer_code
		}
		var tx = new Tx(transfer_rawTx);
	  	tx.sign(privateKey);
	  	var serializedTx = tx.serialize();
	  	console.log("开始发送交易...")
	  	web3.eth.sendSignedTransaction('0x' + serializedTx.toString('hex'),function(err, hash){
			if (!err) {
		        console.log("发送成功,等待回执:",hash);
		    } else {
		        console.error("发送失败",err);
		    }
		}).then(function(data) {
			console.log("交易结果 data:"+JSON.stringify(data));
		});
	})
}

//查询交易状态
function getTransactionReceipt(hash){
	var receipt = web3.eth.getTransactionReceipt(hash).then(console.log);
	console.log("交易信息:",receipt);
}

//根据交易hash查询交易信息
function getTransactionHash(hash){
	var result = web3.eth.getTransaction(hash).then(console.log);
	console.log("交易信息:",result);
}

//查询代币余额
function balanceOf(addr){
	USDT.methods.balanceOf(addr).call(function(error, result){
	    if(!error) {
			console.log(addr,":",web3.utils.fromWei(result, 'mwei'))
	    } else {
	        console.log(addr,":",error);
	    }
	});
}

//查询主币余额
function balance(addr){
	web3.eth.getBalance(addr).then(console.log);	
}

//发主币交易
function mainTransfer(item){
	web3.eth.getTransactionCount(item.from,function(error,nonce){
		let tx = new Tx({
			nonce : web3.utils.toHex(nonce),
			to: item.to,
			value: web3.utils.toHex(web3.utils.toWei(item.val, "ether") ),
			gasLimit: web3.utils.toHex(600000),
			gasPrice: web3.utils.toHex(web3.utils.toWei("15", "gwei")),
			data:data  

		});
		let privateKey = Buffer.from(item.key, 'hex')
		tx.sign(privateKey);
		let serializedTx = tx.serialize();
		web3.eth.sendSignedTransaction('0x' + serializedTx.toString('hex'),function(err, hash){
			console.log("交易结果预览:{error:"+err+",hash:"+hash+"}");
		}).then(function(data) {
			console.log("交易结果 data:"+JSON.stringify(data));
		});
	})
}