（三）波场币trx转账开发java版本

本篇文章主要介绍波场币转账的java开发操作；前面咱们已经有了我们的测试账户，并且账户中已经有了我们的测试币；

为了方便测试，我们需要再申请一个账户，里边不需要获取测试币转入，只是作为我们java代码转账的目标账户；这里不在赘述申请账户的流程，请看上一篇文章；

废话不多说，直接上代码：

trx转账java实现目前一共有两种方法：

1.调用官方接口，实现转账，代码如下：

controller层：

public String easytransferbyprivate(@RequestParam("toAddress") String toAddress,@RequestParam("privateKey") String privateKey,@RequestParam("amount") String amount) {
        Map<String, Object> map = new HashMap<>();
        map.put("标题", "直接转账trx");
        map.put("目标地址", toAddress);
        String result = trc20Service.easytransferbyprivate(toAddress,privateKey,amount);
        map.put("数量", amount);
        return result;
    }

service层：

public String easytransferbyprivate( String toAddress,String privateKey, String amount){
        EasyTransferByPrivate.Param param = new EasyTransferByPrivate.Param();
        param.setAmount(new BigDecimal(amount));
        param.setPrivateKey(privateKey);
        param.setToAddress(toAddress);
        JSONObject obj = feign.easyTransferByPrivate(param);
        System.out.println(obj);
        if (obj != null) {
            HttpRes httpRes = JSON.toJavaObject(obj, HttpRes.class);
            if (httpRes.getResult().getResult()) {
                return httpRes.getTransaction().getTxID();
            }
        }
        return null;

    }

feign调用：

@PostMapping("/wallet/easytransferbyprivate")  ##host:https://api.nileex.io
    JSONObject easyTransferByPrivate(@RequestBody EasyTransferByPrivate.Param param);

注：该调用方法目前测试网还可以使用，主网已经关闭了该方法，主要原因是我们向接口中传递了私钥，有泄漏私钥的风险。但是如果我们想要以此方法进行转账的话，我们需要搭建我们的fullNode节点，用代码内网调用该节点即可；(这里以后在说明搭建fullNode节点方法)

2.本地写代码签名，给公共节点广播进行交易；

controller层：

@GetMapping("/transferTrx")
public String transferTrx() throws IllegalException {
    ApiWrapper client = ApiWrapper.ofNile("42aa7174d122c27afee109e9e322e75475b8f7dc976e749a8c3e1a0e5758d298");//私钥
    Response.TransactionExtention result = client.transfer("TNZML2UDQ7N6WCPeWzyGVPWE6DxGfek1VE", "TXBkMPjX9YZcU2afVdRWKz9o9Z75ZPuNBb", 10000000);//fromAddress,toAddress,amount
    Chain.Transaction signedTransaction = client.signTransaction(result);//签名
    String txid = client.broadcastTransaction(signedTransaction);//广播签名
    return txid;//交易id
}

public TransactionExtention transfer(String fromAddress, String toAddress, long amount) throws IllegalException {

        ByteString rawFrom = parseAddress(fromAddress);
        ByteString rawTo = parseAddress(toAddress);

        TransferContract req = TransferContract.newBuilder()
                .setOwnerAddress(rawFrom)
                .setToAddress(rawTo)
                .setAmount(amount)
                .build();
        TransactionExtention txnExt = blockingStub.createTransaction2(req);

        if(SUCCESS != txnExt.getResult().getCode()){
            throw new IllegalException(txnExt.getResult().getMessage().toStringUtf8());
        }

        return txnExt;
    }

/**
     * broadcast a transaction with the binding account.
     * @return a TransactionReturn object contains the broadcasting result
     * @throws RuntimeException if broadcastin fails
     */
    public String broadcastTransaction(Transaction txn) throws RuntimeException{
        TransactionReturn ret = blockingStub.broadcastTransaction(txn);
        if (!ret.getResult()) {
            String message = resolveResultCode(ret.getCodeValue()) + ", " + ret.getMessage();
            throw new RuntimeException(message);
        } else {
            SHA256.Digest digest = new SHA256.Digest();
            digest.update(txn.getRawData().toByteArray());
            byte[] txid = digest.digest();
            return ByteString.copyFrom(Hex.encode(txid)).toStringUtf8();          
        }
    }

这里由于使用了官方的jar包，这里仅插入部分代码，如有需要请加入我的qq群获取代码：