架構springboot  

這裡使用web3j當前eth官方推薦的整合jdk來做說明！當然你也可以使用它最底層的rpc方案來編寫（官網也有說明）！
這裡做個總結

第一步：先引入jdk [maven]

<dependency>
	<groupId>org.web3j</groupId>
	<artifactId>core</artifactId>
	<version>3.2.0</version>
</dependency>

Web3j web3 = Web3j.build(new HttpService("http://localhost:5201314/"));
 

Web3ClientVersion web3ClientVersion;
try {
	web3ClientVersion = web3.web3ClientVersion().send();
	String clientVersion = web3ClientVersion.getWeb3ClientVersion();
	System.out.println(clientVersion);
} catch (IOException e) {
	e.printStackTrace();
}

String filePath = "E:/pictures";
String fileName;
// 建立錢包地址
 

//eth-密碼需要自己管理，自己設定哦！
fileName = WalletUtils.generateNewWalletFile("設定你的密碼", new File(filePath), false);
System.out.println(fileName);//儲存你的加密檔案資訊
System.out.println(ALICE.getAddress());//錢包地址
System.out.println(ALICE.getEcKeyPair().getPrivateKey());//私鑰
System.out.println(ALICE.getEcKeyPair().getPublicKey());//公鑰
 

產生交易需要載入私鑰和錢包地址。這裡用引用檔案的方式來載入錢包地址！

String path='錢包加密檔案地址';

Credentials ALICE = WalletUtils.loadCredentials("你的密碼", path);

BigInteger nonce = getNonce("傳送錢包地址");

private static BigInteger getNonce(String address) throws Exception {
EthGetTransactionCount ethGetTransactionCount = 

web3.ethGetTransactionCount(address,DefaultBlockParameterName.LATEST).sendAsync().get();
return ethGetTransactionCount.getTransactionCount();
}

//傳送金額

RawTransaction rawTransaction = createEtherTransaction(nonce, "mubia錢包地址");

private static RawTransaction createEtherTransaction(BigInteger nonce, String toAddress) {
BigInteger value = Convert.toWei("數量", Convert.Unit.ETHER).toBigInteger();

//交易手續費由price*limit來決定，所有這兩個值你可以自定義，也可以使用系統引數獲取當前兩個值

//返回物件

byte[] signedMessage = TransactionEncoder.signMessage(rawTransaction, ALICE);

//交易訂單號
String hexValue = Numeric.toHexString(signedMessage);

// //獲取餘額
EthGetBalance ethGetBalance1 = web3.ethGetBalance("0xb86d57174bf8c53f1084be7f565f9fd9dabd87d0", DefaultBlockParameter.valueOf("latest")).send();

//eth預設會部18個0這裡處理比較隨意，大家可以隨便處理哈
BigDecimal balance = new BigDecimal(ethGetBalance1.getBalance().divide(new BigInteger("10000000000000")).toString());
BigDecimal nbalance = balance.divide(new BigDecimal("100000"), 8, BigDecimal.ROUND_DOWN);
System.out.println(nbalance);