安装go语言环境到/usr/local下

wget链接获取来源链接为https://studygolang.com/dl，如果以下wget命令失效请到以上网站获取或下载
打开终端

sudo wget -P /usr/local https://studygolang.com/dl/golang/go1.15.linux-amd64.tar.gz
cd /usr/local
sudo tar -zxvf go1.15.linux-amd64.tar.gz

添加环境变量

vi ~/.bashrc

将以下内容复制到bashrc文件中，按“I”插入，插入完成后按“ESC”退出插入，输出“：wq！”保存退出，如下图所示

export GOROOT=/usr/local/go
export PATH=$PATH:$GOROOT/bin
export GOPATH=$HOME/go

source ~/.bashrc

验证go是否安装成功

go version

安装docker

sudo yum install -y yum-utils

sudo yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum makecache fast
sudo yum -y install docker-ce

启动Docker-ce

sudo systemctl start docker
sudo systemctl enable docker

将当前用户添加到docker组中

sudo usermod -aG docker $USER

检查docker是否安装成功

docker -v

安装docker-compose

curl -L https://get.daocloud.io/docker/compose/releases/download/1.12.0/docker-compose-`uname -s`-`uname -m` > ~/docker-compose
sudo mv ~/docker-compose /usr/local/bin/docker-compose 
chmod +x /usr/local/bin/docker-compose

查看docker是否安装成功

docker-compose -v

### 下载Hyperledger Fabric源码
安装git
```javascript
wget http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
sudo rpm -ivh epel-release-latest-7.noarch.rpm
sudo yum install -y git

下面第一条指令中yujialing为你的用户名

cd /home/yujialing
mkdir go
mkdir go/src
mkdir go/src/github.com
mkdir go/src/github.com/hyperledger
mkdir go/pkg 
mkdir go/bin
cd go/src/github.com/hyperledger
git clone https://github.com/hyperledger/fabric.git

下载速度还是很慢的小伙伴可以使用试下我的gitee仓库克隆，一样的

git clone https://gitee.com/yu_jialing/fabric.git

下载完成

cd fabric
git checkout release-2.0

编译并拉取docker镜像

sudo yum install gcc
make all

查看docker镜像

sudo docker images

下载Fabric的例程

git clone https://github.com/hyperledger/fabric-samples.git
git checkout v2.0.0

将编译后的可执行文件放入fabric-samples中

cd fabric-samples
cp -r build/bin fabric-samples

启动简单的联盟链网络

切换到first-network中的abstore智能合约文件中下载依赖并启动例程联盟链网络

cd first-network/chaincode/abstore/go
cd  ~/go/src/github.com/hyperledger/fabric/fabric-samples/chaincode/fabcar/go
go env -w GOPROXY=https://goproxy.io,direct
go env -w GO111MODULE=on
go mod vendor
cd ../../..
cd first-network/
./byfn.sh up

出现END则表示网络启动成功，网络启动过程详情可以到first-network/scripts文件夹中的script.sh和utils.sh这两个脚本中查看

fabric-gateway-java2.0.0实现与hyperledger联盟链的交互

建立一个maven工程
在pom.xml中导入依赖

<!-- hyperledger fabric2.0的java依赖 -->
<dependency>
    <groupId>org.hyperledger.fabric</groupId>
    <artifactId>fabric-gateway-java</artifactId>
    <version>2.0.0</version>
</dependency>  

回到虚拟机中将执行./byfn.sh up后生成的证书文件（在first-network文件夹下）复制到项目中的resources文件夹下

同时在resources文件夹下新建connection.json文件，用来放连接联盟链网络参数

查看IP地址，connection.json要用到

ifconfig env33

connection.json如下，里面涉及的ip地址是你开启区块链网络的主机地址

{
  "name": "basic-network",
  "version": "1.0.0",
  "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/priv_sk"
      },
      "signedCertPEM": {
        "path": "src/main/resources/crypto-config/peerOrganizations/org1.example.com/users/Admin@org1.example.com/msp/signcerts/Admin@org1.example.com-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/priv_sk"
      },
      "signedCertPEM": {
        "path": "src/main/resources/crypto-config/peerOrganizations/org2.example.com/users/Admin@org2.example.com/msp/signcerts/Admin@org2.example.com-cert.pem"
      }
    }
  },
  "orderers": {
    "orderer.example.com": {
      "url": "grpcs://192.168.171.xxx: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/priv_sk"
      },
      "signedCertPEM": {
        "path": "src/main/resources/crypto-config/ordererOrganizations/example.com/users/Admin@example.com/msp/signcerts/Admin@example.com-cert.pem"
      }
    }
  },
  "peers": {
    "peer0.org1.example.com": {
      "url": "grpcs://192.168.171.xxx: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://192.168.171.xxx: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://192.168.171.xxx: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://192.168.171.xxx: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"
        }
      ]
    }
  }
}

运行以下代码（随便命名demo.java就行）

package com.scau.amops.hyperledger;

import lombok.extern.slf4j.Slf4j;
import org.hyperledger.fabric.gateway.*;
import org.hyperledger.fabric.gateway.impl.GatewayImpl;
import org.hyperledger.fabric.sdk.Peer;

import java.io.IOException;
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;

@Slf4j
public class fabricdemo {
    private Gateway gateway;
    private Network network;
    private static final Path NETWORK_CONFIG_PATH = Paths.get("src", "main", "resources", "connection.json");
    private static final Path credentialPath = Paths.get("src", "main","resources", "crypto-config",
            "peerOrganizations", "org1.example.com", "users", "User1@org1.example.com", "msp");

    public static void main(String[] args) {

        X509Certificate certificate = null;
        PrivateKey privateKey = null;
        Gateway gateway = null;
        try {
            //使用org1中的user1初始化一个网关wallet账户用于连接网络
            Wallet wallet = Wallets.newInMemoryWallet();
            Path certificatePath = credentialPath.resolve(Paths.get("signcerts", "User1@org1.example.com-cert.pem"));
            certificate = readX509Certificate(certificatePath);

            Path privateKeyPath = credentialPath.resolve(Paths.get("keystore", "priv_sk"));
            privateKey = getPrivateKey(privateKeyPath);

            wallet.put("user",Identities.newX509Identity("Org1MSP",certificate,privateKey));

            //根据connection.json 获取Fabric网络连接对象
            GatewayImpl.Builder builder = (GatewayImpl.Builder) Gateway.createBuilder();

            builder.identity(wallet, "user").networkConfig(NETWORK_CONFIG_PATH);
            //连接网关
            gateway = builder.connect();
            //获取mychannel通道
            Network network = gateway.getNetwork("mychannel");
            //获取合约对象
            Contract contract = network.getContract("mycc");
            //查询a的余额
            byte[] queryAResultBefore = contract.evaluateTransaction("query","a");
            System.out.println("交易前："+new String(queryAResultBefore, StandardCharsets.UTF_8));

            // a转50给b
            byte[] invokeResult = contract.createTransaction("invoke")
                    .setEndorsingPeers(network.getChannel().getPeers(EnumSet.of(Peer.PeerRole.ENDORSING_PEER)))
                    .submit("a", "b", "50");
            System.out.println(new String(invokeResult, StandardCharsets.UTF_8));

            //查询交易结果
            byte[] queryAResultAfter = contract.evaluateTransaction("query","a");
            System.out.println("交易后："+new String(queryAResultAfter, 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);
        }
    }
}

运行结果显示

到虚拟机上查一查

docker exec -it cli bash
peer chaincode query -C mychannel -n mycc -c '{"Args":["query", "a"]}'

成功实现外部与联盟链网络交互

持续更新中！！！