[区块链]java通过web3j获取ETH交易明细

? ? 我们在项目里面如果想要得到用户的ETH交易明细怎么做呢？有两种方式：

? ?1、直接获取ETH最新块的交易明细。

? ?2、通过块获取用户的交易明细。

废话不多说，直接贴代码看了

????????

package com.example.demo.web3jLog;

import org.springframework.stereotype.Component;
import org.web3j.protocol.Web3j;
import org.web3j.protocol.core.DefaultBlockParameter;
import org.web3j.protocol.core.DefaultBlockParameterName;
import org.web3j.protocol.core.methods.request.EthFilter;
import org.web3j.protocol.core.methods.response.*;
import org.web3j.protocol.core.methods.response.Transaction;
import org.web3j.protocol.http.HttpService;
import org.web3j.utils.Convert;

import java.io.IOException;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.ExecutionException;

@Component
public class ETHWeb3jTest {

    /**
     * 完成web3的初始化   下面的地址引入区块链节点地址
     */
    public static Web3j web3j = Web3j.build(new HttpService("https://org:8545/"));

    public static void main(String[] args) {
        BigInteger latestBlock;
        try {
            //获取ETH的最新区块号
            latestBlock = web3j.ethBlockNumber().send().getBlockNumber();
            //通过区块号获取交易
            List<EthBlock.TransactionResult> ethGetBlance = web3j.ethGetBlockByNumber(DefaultBlockParameter.valueOf(latestBlock.subtract(new BigInteger("3"))),true).send().getBlock().getTransactions();
            //通过hash获取交易
            Optional<Transaction> transactions = web3j.ethGetTransactionByHash("hash").send().getTransaction();
        } catch (IOException e) {
            e.printStackTrace();
        }
        List<EthBlock.TransactionResult> txs = null;
        try {
            //也可以直接获取最新交易
            txs = web3j.ethGetBlockByNumber(DefaultBlockParameterName.LATEST, true).send().getBlock().getTransactions();
        } catch (IOException e) {
            e.printStackTrace();
        }
        txs.forEach(tx -> {
            EthBlock.TransactionObject transaction = (EthBlock.TransactionObject) tx.get();
            System.out.println(transaction.getFrom());
        });
    }

}

下面是项目的相关依赖：

<dependency>
    <groupId>org.web3j</groupId>
    <artifactId>core</artifactId>
    <version>3.4.0</version>
</dependency>

<dependency>
    <groupId>com.google.guava</groupId>
    <artifactId>guava</artifactId>
    <version>29.0-jre</version>
</dependency>
<dependency>
    <groupId>org.bitcoinj</groupId>
    <artifactId>bitcoinj-core</artifactId>
    <version>0.15.5</version>
</dependency>