[币严区块链]交易所钱包系统如何实现USDT自动归集操作

本文代码应用场景：

每个用户在交易所充值时，每个人都分配了独立的USDT地址，而交易所需要将所有独立的地址中USDT汇集到一个钱包地址（一般是冷钱包），从而实现资产归集与安全保障。

注意：

理解以下代码最好先搭建好一个USDT的节点，再在命令行中体验以下RPC的调用效果。

package com.bizzan.col;
import com.googlecode.jsonrpc4j.JsonRpcHttpClient;
import org.apache.commons.codec.binary.Base64;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.net.URL;
import java.net.URLConnection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class UsdtCollect {

     private  String url = "http://127.0.0.1:18332";
     private  String username = "u";
     private  String password = "p";
    //outValue是总钱数，这个一般在充值记录里面计算。我就不调用钱包去查询了
    public String collectionUsdt( BigDecimal outValue) {
        JsonRpcHttpClient client = null;
        try {
            Map[] argsOne = new Map[1];
            Map[] args1 = new Map[1];
            String creb = Base64.encodeBase64String((username+":"+password).getBytes());
            Map<String,String> headers = new HashMap<>(2);
            headers.put("Authorization","Basic "+creb);
            headers.put("server", "1");
            client = new JsonRpcHttpClient(new URL(url), headers);
            List<Map> listunspent = (List<Map>) client.invoke("listunspent", new Object[]{}, Object.class);
            for (Map map : listunspent) {
                Double amount=(Double) map.get("amount");
                //这里是找一笔uxto的btc交易做桥梁
                if(amount>1){
                    String txId =(String) map.get("txid");
                    String scriptPubKey =(String) map.get("scriptPubKey");
                    int vout =(int) map.get("vout");
                    Map input = new HashMap<>();
                    input.put("txid", txId);
                    input.put("vout", vout);
                    args1[0] = input;
                    Map inputT = new HashMap<>();
                    inputT.put("txid", txId);
                    inputT.put("vout",vout);
                    inputT.put("scriptPubKey", scriptPubKey);
                    inputT.put("value", amount);
                    argsOne[0] = inputT;
                    break;
                }
            }
            //计算字节大小和费用(因为是归集USDT 所以我用最小的输入来降低手续费，如果你是BTC和USDT一起归总那就要根据归集的输入来计算了)
            BigDecimal keyCount = calculationFee(1);
            //将聪换算成BTC
            BigDecimal transferFee = keyCount.divide(new BigDecimal("100000000"), 8, RoundingMode.HALF_UP);
            if (transferFee.compareTo(BigDecimal.ZERO) <= 0 || outValue.compareTo(transferFee) <= 0) {
                return null;
            }
            /**
             * 通过全节点构造原生交易
             */
            //创建BTC交易
            Map args2 = new HashMap<>();
            Object result = (Object) client.invoke("createrawtransaction", new Object[]{args1,args2 }, Object.class);
            String transaction = String.valueOf(result);
            /*//解锁钱包
            client.invoke("walletpassphrase", new Object[]{"xxxx", 100}, Object.class);*/
            //创建Usdt交易
            String simplesendResult = (String) client.invoke("omni_createpayload_simplesend", new Object[]{ 1,outValue.toString() }, Object.class);
            //usdt交易附加到BTC交易上
            String opreturnResult = (String) client.invoke("omni_createrawtx_opreturn", new Object[]{transaction,simplesendResult}, Object.class);
            //设置归总地址
            String reference = (String) client.invoke("omni_createrawtx_reference", new Object[]{opreturnResult,"归总地址"}, Object.class);
            //填写手续费及找零地址
            String changeResult = (String) client.invoke("omni_createrawtx_change", new Object[]{reference,argsOne,"找零地址",transferFee.toString()}, Object.class);
            //获取原生交易hex
            Map signrawtransaction = (Map) client.invoke("signrawtransaction", new Object[]{changeResult}, Object.class);
            //广播交易
            String txId = (String) client.invoke("sendrawtransaction", new Object[]{signrawtransaction.get("hex")}, Object.class);
            return txId;
        } catch (Exception e) {
            e.printStackTrace();
        } catch (Throwable e1) {
            e1.printStackTrace();
        }
        return null;
    }

    /**
     * 计算手续费
     *
     * @param inputCount
     * @return
     */
    private BigDecimal calculationFee( int inputCount) {
        //计算手续费获取每个字节的手续费
        String url="bitcoinfees.earn.com";
        //计算字节大小和费用
        String resut=sendGet(url,null);
        //=====resut===>转对象Model省略了，其实http请求都有公用的方法所以我随便写了。。
        BigDecimal keyCount = BigDecimal.valueOf((inputCount * 148 + 44) * Model.getHalfHourFee());
        //
        return keyCount;

    }
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }
}

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