用fabric-sdk-java调用Fabcar链码

一、启动fabcar

1、设置go代理

go env -w GOPROXY=https://goproxy.io,direct
go env -w GO111MODULE=on

2、启动fabcar测试网络

cd hyperleger/fabric-2.3.0/scripts/fabric-samples/fabcar
./startFabric.sh

出现如下则成功

用fabric-sdk-java调用Fabcar链码_第1张图片

 

 

3、利用SDK与fabric网络交互

可以选择javascript,typescript,java,go语言与网络交互
我们今天选择nodejs

cd /scripts/fabric-samples/fabcar
cd javascript
npm install

我们按照合约流程依次启动

node enrollAdmin.js
node registerUser.js
node invoke.js
node query.js 

用fabric-sdk-java调用Fabcar链码_第2张图片

二、java代码远程交互

1、pom中增加依赖


         org.hyperledger.fabric
         fabric-gateway-java
         2.2.0
      
       
           org.hyperledger.fabric-sdk-java
           fabric-sdk-java
           1.4.7
       

 2、在resources新建文件夹crypto-config

把hyperledger/fabric/fabric-samples/test-network/organizations下的生成的两个文件夹ordererOrganizations.example.com 和 peerOrganizations 下载下来,放在crypto-config文件夹。

用fabric-sdk-java调用Fabcar链码_第3张图片

3、connection.json文件

{
  "name": "basic-network",
  "version": "1.0.0",
  "dependencies": {
  },
  "client": {
    "organization": "Org1",
    "connection": {
      "timeout": {
        "peer": {
          "endorser": "300"
        },
        "orderer": "300"
      }
    }
  },
  "channels": {
    "mychannel": {
      "orderers": [
        "orderer.example.com"
      ],
      "peers": {
        "peer0.org1.example.com": {
          "endorsingPeer": true,
          "chaincodeQuery": true,
          "ledgerQuery": true,
          "eventSource": true
        },
        "peer0.org2.example.com": {
          "endorsingPeer": true,
          "chaincodeQuery": true,
          "ledgerQuery": true,
          "eventSource": true
        }
      }
    }
  },
  "organizations": {
    "Org1": {
      "mspid": "Org1MSP",
      "peers": [
        "peer0.org1.example.com"
      ],
      "certificateAuthorities": [
        "ca-org1"
      ],
      "adminPrivateKeyPEM": {
        "path": "src/main/resources/crypto-config/peerOrganizations/org1.example.com/users/Admin@org1.example.com/msp/keystore/4ea4ce412621db1527ea875140b0e5c5b0430b480f1555deb6eb4dcb3bce4e55_sk"
      },
      "signedCertPEM": {
        "path": "src/main/resources/crypto-config/peerOrganizations/org1.example.com/users/Admin@org1.example.com/msp/signcerts/cert.pem"
      }
    },
    "Org2": {
      "mspid": "Org2MSP",
      "peers": [
        "peer0.org2.example.com"
      ],
      "certificateAuthorities": [
        "ca-org2"
      ],
      "adminPrivateKeyPEM": {
        "path": "src/main/resources/crypto-config/peerOrganizations/org2.example.com/users/Admin@org2.example.com/msp/keystore/808dee8538bfe6e6c6184a643913c3cb5e32b783a8acd0d05e66522aa2b65d48_sk"
      },
      "signedCertPEM": {
        "path": "src/main/resources/crypto-config/peerOrganizations/org2.example.com/users/Admin@org2.example.com/msp/signcerts/cert.pem"
      }
    }
  },
  "orderers": {
    "orderer.example.com": {
      "url": "grpcs://192.168.101.15:7050",
      "mspid": "OrdererMSP",
      "grpcOptions": {
        "ssl-target-name-override": "orderer.example.com",
        "hostnameOverride": "orderer.example.com"
      },
      "tlsCACerts": {
        "path": "src/main/resources/crypto-config/ordererOrganizations/example.com/orderers/orderer.example.com/tls/ca.crt"
      },
      "adminPrivateKeyPEM": {
        "path": "src/main/resources/crypto-config/ordererOrganizations/example.com/users/Admin@example.com/msp/keystore/ac41182e8d420f1752bb423d9d137b6d24bca0edfb0d312d2ef832cda5fdbfee_sk"
      },
      "signedCertPEM": {
        "path": "src/main/resources/crypto-config/ordererOrganizations/example.com/users/Admin@example.com/msp/signcerts/cert.pem"
      }
    }
  },
  "peers": {
    "peer0.org1.example.com": {
      "url": "grpcs://192.168.101.15:7051",
      "grpcOptions": {
        "ssl-target-name-override": "peer0.org1.example.com",
        "hostnameOverride": "peer0.org1.example.com",
        "request-timeout": 120001
      },
      "tlsCACerts": {
        "path": "src/main/resources/crypto-config/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/tls/ca.crt"
      }
    },
    "peer0.org2.example.com": {
      "url": "grpcs://192.168.101.15:9051",
      "grpcOptions": {
        "ssl-target-name-override": "peer0.org2.example.com",
        "hostnameOverride": "peer0.org2.example.com",
        "request-timeout": 120001
      },
      "tlsCACerts": {
        "path": "src/main/resources/crypto-config/peerOrganizations/org2.example.com/peers/peer0.org2.example.com/tls/ca.crt"
      }
    }
  },
  "certificateAuthorities": {
    "ca-org1": {
      "url": "https://192.168.101.15:7054",
      "grpcOptions": {
        "verify": true
      },
      "tlsCACerts": {
        "path": "src/main/resources/crypto-config/peerOrganizations/org1.example.com/ca/ca.org1.example.com-cert.pem"
      },
      "registrar": [
        {
          "enrollId": "admin",
          "enrollSecret": "adminpw"
        }
      ]
    },
    "ca-org2": {
      "url": "https://192.168.101.15:8054",
      "grpcOptions": {
        "verify": true
      },
      "tlsCACerts": {
        "path": "src/main/resources/crypto-config/peerOrganizations/org2.example.com/ca/ca.org2.example.com-cert.pem"
      },
      "registrar": [
        {
          "enrollId": "admin",
          "enrollSecret": "adminpw"
        }
      ]
    }
  }
}

4、配置fabric.config.properties文件

注意:自行更换部署链码的ip,以及各个证书和私钥路径

# 网络配置文件路径
networkConfigPath = src/main/resources/connection.json
# 用户1,机构1证书路径
#certificatePath = src/main/resources/crypto-config/peerOrganizations/org1.example.com/users/User1@org1.example.com/msp/signcerts/cert.pem
# 用户1,机构1私钥路径
#privateKeyPath = src/main/resources/crypto-config/peerOrganizations/org1.example.com/users/User1@org1.example.com/msp/keystore/bd7300f6555aa0845d05bb751e283838c0820b6962cbdfb3dc60399476933fb1_sk


# 用户1,机构2证书路径
certificatePath = src/main/resources/crypto-config/peerOrganizations/org2.example.com/users/User1@org2.example.com/msp/signcerts/cert.pem
# 用户1,机构2证书私钥路径
privateKeyPath = src/main/resources/crypto-config/peerOrganizations/org2.example.com/users/User1@org2.example.com/msp/keystore/340cd3c807db92bc25e89192fa9e556db7ffac1d3aee78443b268ec7b84e8a33_sk


# 通道名字
channelName = mychannel

# 链码名字
contractName = fabcar

5、连接并调用链码

package org.example;

import org.hyperledger.fabric.gateway.*;
import org.hyperledger.fabric.sdk.Peer;

import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.security.InvalidKeyException;
import java.security.PrivateKey;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.EnumSet;
import java.util.Properties;

public class SdkDemo2 {

    public static void main(String[] args) {
        try {
            //获取相应参数
            Properties properties = new Properties();
            InputStream inputStream = SdkDemo2.class.getResourceAsStream("/fabric.config.properties");
            properties.load(inputStream);

            String networkConfigPath = properties.getProperty("networkConfigPath");
            String channelName = properties.getProperty("channelName");
            String contractName = properties.getProperty("contractName");
            //使用org1中的user1初始化一个网关wallet账户用于连接网络
            String certificatePath = properties.getProperty("certificatePath");
            X509Certificate certificate = readX509Certificate(Paths.get(certificatePath));

            String privateKeyPath = properties.getProperty("privateKeyPath");
            PrivateKey privateKey = getPrivateKey(Paths.get(privateKeyPath));

            Wallet wallet = Wallets.newInMemoryWallet();
            wallet.put("user1", Identities.newX509Identity("Org2MSP",certificate,privateKey));

            //根据connection.json 获取Fabric网络连接对象
            Gateway.Builder builder = Gateway.createBuilder()
                    .identity(wallet, "user1")
                    .networkConfig(Paths.get(networkConfigPath));
            //连接网关
            Gateway gateway = builder.connect();
            //获取通道
            Network network = gateway.getNetwork(channelName);
            //获取合约对象
            Contract contract = network.getContract(contractName);
            //查询现有资产
            //注意更换调用链码的具体函数
            byte[] queryAllAssets = contract.evaluateTransaction("queryAllCars");
            //byte[] queryAllAssets = contract.evaluateTransaction("queryCar","CAR13");
            System.out.println("所有资产:"+new String(queryAllAssets, StandardCharsets.UTF_8));

            // 增加新的资产
           // byte[] invokeResult = contract.createTransaction("createCar")
            //        .setEndorsingPeers(network.getChannel().getPeers(EnumSet.of(Peer.PeerRole.ENDORSING_PEER)))
            //        .submit("CAR13", "dazhong", "Accord", "Black", "Tianly");
            //System.out.println(new String(invokeResult, StandardCharsets.UTF_8));

            byte[] invokeResult = contract.createTransaction("changeCarOwner")
                    .setEndorsingPeers(network.getChannel().getPeers(EnumSet.of(Peer.PeerRole.ENDORSING_PEER)))
                    .submit("CAR0", "王三春");


            //查询更新后的资产
            byte[] queryAllAssetsAfter = contract.evaluateTransaction("queryAllCars");
            System.out.println("更新资产:"+new String(queryAllAssetsAfter, StandardCharsets.UTF_8));

        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    private static X509Certificate readX509Certificate(final Path certificatePath) throws IOException, CertificateException {
        try (Reader certificateReader = Files.newBufferedReader(certificatePath, StandardCharsets.UTF_8)) {
            return Identities.readX509Certificate(certificateReader);
        }
    }

    private static PrivateKey getPrivateKey(final Path privateKeyPath) throws IOException, InvalidKeyException {
        try (Reader privateKeyReader = Files.newBufferedReader(privateKeyPath, StandardCharsets.UTF_8)) {
            return Identities.readPrivateKey(privateKeyReader);
        }
    }
}

结果,成功

用fabric-sdk-java调用Fabcar链码_第4张图片

参考:

https://blog.csdn.net/jambeau/article/details/107551208

https://blog.csdn.net/klay077/article/details/109189630

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