transfer EOS with java client

TransferEOS.java

package eos.sample;

import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.log4j.BasicConfigurator;

import com.fasterxml.jackson.databind.ObjectMapper;

import io.jafka.jeos.EosApi;
import io.jafka.jeos.EosApiFactory;
import io.jafka.jeos.core.common.transaction.PackedTransaction;
import io.jafka.jeos.core.common.transaction.SignedPackedTransaction;
import io.jafka.jeos.core.common.transaction.TransactionAction;
import io.jafka.jeos.core.common.transaction.TransactionAuthorization;
import io.jafka.jeos.core.request.chain.json2bin.TransferArg;
import io.jafka.jeos.core.response.chain.AbiJsonToBin;
import io.jafka.jeos.core.response.chain.Block;
import io.jafka.jeos.core.response.chain.transaction.PushedTransaction;
import io.jafka.jeos.exception.EosApiException;
import io.jafka.jeos.impl.EosApiServiceGenerator;

public class TransferEOS {

    static void transfer(EosApi client) throws Exception {
        ObjectMapper mapper = EosApiServiceGenerator.getMapper();

        final String from = "shijiebanggg";

        // ① pack transfer data
        TransferArg transferArg = new TransferArg(from, "shijiebangmm", "0.9999 EOS", "我是中国人");
        AbiJsonToBin data = client.abiJsonToBin("eosio.token", "transfer", transferArg);
        System.out.println("bin= " + data.getBinargs());

        // ② get the latest block info
        Block block = client.getBlock(client.getChainInfo().getHeadBlockId());
        System.out.println("blockNum=" + block.getBlockNum());

        // ③ create the authorization
        List<TransactionAuthorization> authorizations = Arrays.asList(new TransactionAuthorization(from, "active"));

        // ④ build the all actions
        List<TransactionAction> actions = Arrays.asList(//
                new TransactionAction("eosio.token", "transfer", authorizations, data.getBinargs())//
        );

        // ⑤ build the packed transaction
        PackedTransaction packedTransaction = new PackedTransaction();
        packedTransaction.setRefBlockPrefix(block.getRefBlockPrefix());
        packedTransaction.setRefBlockNum(block.getBlockNum());
        // expired after 3 minutes
        String expiration = ZonedDateTime.now(ZoneId.of("GMT")).plusMinutes(3).truncatedTo(ChronoUnit.SECONDS).format(DateTimeFormatter.ISO_LOCAL_DATE_TIME);
        packedTransaction.setExpiration(expiration);
        packedTransaction.setRegion("0");
        packedTransaction.setMaxNetUsageWords(0);
        packedTransaction.setMaxCpuUsageMs(0);
        packedTransaction.setActions(actions);

        // ⑥ unlock the creator's wallet
        try {
            client.unlockWallet("default", "PW5KGXiGoDXEM54YWn6yhjCmNkAwpyDemLUqRaniAwuhTArciS6j9");
        } catch (EosApiException ex) {
            System.err.println(ex.getMessage());
        }

        // ⑦ sign the transaction
        SignedPackedTransaction signedPackedTransaction = client.signTransaction(packedTransaction, //
                Arrays.asList("EOS7XP7Ks7j68Uh64HGTEeiaMsgAgKcuZbYAAf86SoPLBpxcBX5it"), //
                "038f4b0fc8ff18a4f0842a8f0564611f6e96e8535901dd45e43ac8691a1c4dca");

        System.out.println("signedPackedTransaction=" + mapper.writeValueAsString(signedPackedTransaction));
        System.out.println("\n--------------------------------\n");

        // ⑧ push the signed transaction
        PushedTransaction pushedTransaction = client.pushTransaction("none", signedPackedTransaction);
        System.out.println("pushedTransaction=" + mapper.writeValueAsString(pushedTransaction));
    }

    public static void main(String[] args) throws Exception {
        BasicConfigurator.configure();
        EosApi client = EosApiFactory.create("http://127.0.0.1:8900", "http://jungle.cryptolions.io:18888", "http://jungle.cryptolions.io:18888");
        ;
        // ------------------------------------------------------------------------
        transfer(client);
    }

}

EosApiFactory.create The third parameter What means