在IDEA中运用fabric-sdk-java与fabric-samples中的fabcar项目进行交互

最新推荐文章于 2022-04-19 22:23:49 发布

-bin_bin-

最新推荐文章于 2022-04-19 22:23:49 发布

阅读量7.1k

点赞数 4

分类专栏：区块链文章标签：区块链 fabric-sdk-java fabcar

本文链接：https://blog.youkuaiyun.com/m0_37459945/article/details/85633133

版权

本文介绍了如何在IDEA中使用fabric-sdk-java与fabric-samples的fabcar项目进行交互，包括引入依赖、编写测试代码、启动fabcar网络、执行链码操作。在遇到链码更新后查询结果未变的问题时，发现是由于旧的链码镜像导致，删除相应镜像后问题解决。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

一、准备
1、在项目中引入maven依赖

<!-- https://mvnrepository.com/artifact/org.hyperledger.fabric-sdk-java/fabric-sdk-java -->
<dependency>
    <groupId>org.hyperledger.fabric-sdk-java</groupId>
    <artifactId>fabric-sdk-java</artifactId>
    <version>1.3.0</version>
</dependency>

2、编写测试代码（包含Fabcar.java、CertUtils.java两个类）
Fabcar.java

import org.hyperledger.fabric.sdk.ChaincodeID;
import org.hyperledger.fabric.sdk.Channel;
import org.hyperledger.fabric.sdk.Enrollment;
import org.hyperledger.fabric.sdk.HFClient;
import org.hyperledger.fabric.sdk.ProposalResponse;
import org.hyperledger.fabric.sdk.QueryByChaincodeRequest;
import org.hyperledger.fabric.sdk.TransactionProposalRequest;
import org.hyperledger.fabric.sdk.User;
import org.hyperledger.fabric.sdk.security.CryptoSuite;
import org.hyperledger.fabric_ca.sdk.HFCAClient;

import java.util.Collection;
import java.util.Collections;
import java.util.Properties;
import java.util.Set;

public class Fabcar{
    public static void main(String[] args) throws Exception {
        enroll("admin", "adminpw", "cert");
        queryCar();
        updateCar();
        Thread.sleep(5000);
        queryCar();
    }

    /**
     * 更新账本
     * @throws Exception
     */
    private static void updateCar() throws Exception {
        HFClient client = HFClient.createNewInstance();
        Channel channel = initChannel(client);

        // 构建proposal
        TransactionProposalRequest req = client.newTransactionProposalRequest();
        // 指定要调用的chaincode
        ChaincodeID cid = ChaincodeID.newBuilder().setName("fabcar").build();
        req.setChaincodeID(cid);
        req.setFcn("changeCarOwner");
        req.setArgs(new String[]{"CAR1", "Marry"});
        System.out.println("Executing for " + "CAR1");
        // 发送proprosal
        Collection<ProposalResponse> resps = channel.sendTransactionProposal(req);

        // 提交给orderer节点
        channel.sendTransaction(resps);
    }

    /**
     * 查询账本
     * @throws Exception
     */
    private static void queryCar() throws Exception {
        HFClient client = HFClient.createNewInstance();
        Channel channel = initChannel(client);

        String key = "CAR1";

        // 构建proposal
        QueryByChaincodeRequest req = client.newQueryProposalRequest();
        // 指定要调用的chaincode
        ChaincodeID cid = ChaincodeID.newBuilder().setName("fabcar").build();
        req.setChaincodeID(cid);
        req.setFcn("queryCar");
        req.setArgs(new String[] { key });
        System.out.println("Querying for " + key);

最低0.47元/天解锁文章