本文共 10762 字，大约阅读时间需要 35 分钟。

其实该方法也基本适用于Ubuntu系统，区别在于CentOS用yum下载工具包，Ubuntu用apt-get下载工具包，用Ubuntu的小伙伴可灵活使用该方法

安装go语言环境到/usr/local下

wget链接获取来源为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，输入指令

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

添加环境变量

vim ~/.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/goexport PATH=$PATH:$GOROOT/binexport GOPATH=$HOME/go

source ~/.bashrc

验证go是否安装成功

go version

安装docker

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

启动Docker-ce

sudo systemctl start dockersudo systemctl enable docker

将当前用户添加到docker组中

sudo usermod -aG docker $USERnewgrp - docker

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-composesudo 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

wget http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpmsudo rpm -ivh epel-release-latest-7.noarch.rpmsudo yum install -y git

下面第一条指令中yujialing为你的用户名

cd /home/yujialingmkdir gomkdir go/srcmkdir go/src/github.commkdir go/src/github.com/hyperledgermkdir go/pkg mkdir go/bincd go/src/github.com/hyperledgergit clone https://github.com/hyperledger/fabric.git

下载速度还是很慢的小伙伴可以Ctrl+C结束以上github克隆进程，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 fabricgit checkout release-2.0

编译并拉取docker镜像

sudo yum install gccmake all

查看docker镜像

sudo docker images

下载Fabric的例程

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

将编译后的可执行文件放入fabric-samples中

cd fabric-samplescp -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 ~/go/src/github.com/hyperledger/fabric/fabric-samples/chaincode/abstore/gogo env -w GOPROXY=https://goproxy.io,directgo env -w GO111MODULE=ongo mod vendorcd ../../..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

项目路径不要出现中文，否则将因读不到crypto-config里面的证书文件而报错 在pom.xml中导入依赖

   
       
    
     org.hyperledger.fabric
        
    
     fabric-gateway-java
        
    
     2.0.0
    
   

回到虚拟机中将执行./byfn.sh up后生成的证书文件夹crypto-config（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，记得改下面的IP否则连接不上

{     "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;/** * 
 *  超级账本DEMO * 
 */@Slf4jpublic class demo{       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，a的余额的确变为40

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

成功实现外部与联盟链网络交互

虚拟机关机前记得将区块链网络关掉，不然下次开机启动区块链网络则报错

cd ~/go/src/github.com/hyperledger/fabric/fabric-samples/first-network./byfn.sh down

持续更新中！！！

（将更新：修改启动网络的脚本实现其他智能合约的应用）