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1. 开发环境搭建
   http://www.17bigdata.com/study/programming/solidity/solidity-setup.html

2. Source file requires different compiler version (current compiler is 0.8.19+commit.7dd6d404.Emscripten.clang)

    将文件solidity ^0.7.0 修改为solidity ^0.8.14
   

3. ide 工具安装

pip3 install sphinx sphinx_rtd_theme
pip3 install myst-parser
git clone https://github.com/ethereum/remix-ide.git
cd docs/
make html

4. 搭建私链节点

    http://club.coder55.com/article?id=86681
   

自定义一个创世区块的json配置文件genesis.json，与保存数据目录data

 geth --datadir /Users/liangw/Desktop/data/geth/local_ethereum_blockchain init local_ethereum_blockchain/genesis.json

启动geth

 geth --datadir data0  --networkid 8888 --port 30303 --http --http.addr "0.0.0.0" --http.port 8545 --http.api 'db,net,eth,web3,personal' --nodiscover --allow-insecure-unlock --http.corsdomain '*' console 2>> geth.log

Failed to write genesis block: unsupported fork ordering: eip150Block not enabled, but eip155Block enabled at block 0

{
  "config": {
    "chainId": 666,
    "homesteadBlock": 0,
    "eip150Block": 0,
    "eip150Hash": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "eip155Block": 0,
    "eip158Block": 0,
    "byzantiumBlock": 0,
    "constantinopleBlock": 0,
    "petersburgBlock": 0,
    "istanbulBlock": 0,
    "ethash": {}
  },
  "nonce": "0x0",
  "timestamp": "0x5ddf8f3e",
  "extraData": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "gasLimit": "0x47b760",
  "difficulty": "0x00002",
  "mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "coinbase": "0x0000000000000000000000000000000000000000",
  "alloc": { },
  "number": "0x0",
  "gasUsed": "0x0",
  "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000"
}
 

personal is not defined

  mac 安装 geth version 1.11.6-stable-ea9e62ca出现的问题，将安装包换成1.10.26-stable
  下载链接https://geth.ethereum.org/downloads

 https://zhuanlan.zhihu.com/p/515941029?utm_id=0

5. 以太坊钱包连接本地私有链

      1. chrome浏览器下载MetaMask插件
      2. 添加本地区块网络
      3. 注意：有可能因为区块启动的时候没有配置crossOrigin 导致连接不上问题，可以用上面的区块启动命令解决。
   

6. metamask 显示测试网络

   https://zhuanlan.zhihu.com/p/449202045
   

7. 使用truffle 构建智能合约 部署以及测试

    https://blog.csdn.net/ling1998/article/details/124146467
   

   truffle console报错
   修改为 truffle console --network develop
   

8. java调用智能合约

    https://blog.csdn.net/qq_43707926/article/details/123855626
   

   报“only replay-protected (EIP-155) transactions allowed over RPC”是因为什么

     启动指令添加 --rpc.allow-unprotected-txs
   

调用代码：

import org.web3j.abi.datatypes.Utf8String;
import org.web3j.crypto.Credentials;
import org.web3j.crypto.WalletUtils;
import org.web3j.protocol.Web3j;
import org.web3j.protocol.core.methods.response.TransactionReceipt;
import org.web3j.protocol.http.HttpService;

import java.math.BigInteger;
import java.util.List;

public class Testcontract {


    public static void main(String[] arg) throws Exception {

        Web3j web3j = Web3j.build(new HttpService("http://127.0.0.1:8545"));
        BigInteger gasPrices = web3j.ethGasPrice().send().getGasPrice();
        System.out.println(gasPrices);

        BigInteger gasLimit = new BigInteger("1000000");

        // 设置钱包账户
        Credentials credentials = WalletUtils.loadCredentials("123456", "/Users/liangw/Desktop/data/geth/privatekey/account3.json");
        System.out.println(credentials.getAddress());
        Utf8String utf8String = new Utf8String("你好啊");
        // 部署合约，这里Test_sol_testEth是由web3j生成的java文件的类，需要改成你自己的类名
        Hello_sol_Hello deployContract = Hello_sol_Hello.deploy(web3j, credentials, gasPrices, gasLimit, utf8String).send();

        // 部署完成后打印合约地址
        System.out.println(deployContract.getContractAddress());

        // 判断部署的合约是否可用
        System.out.println(deployContract.isValid());


        // 调用合约
        Hello_sol_Hello testContract = new Hello_sol_Hello(deployContract.getContractAddress(), web3j,
                credentials, gasPrices, gasLimit);
        Utf8String send = testContract.getValue().send();
        System.out.println("-----*****-------");
        System.out.println("******----******" + send);
    }
}

9. 单机搭建联盟链

     https://blog.csdn.net/weixin_47174945/article/details/125391880
   

   如何将 openSSL Version 由LibreSSL 2.8.3修改为OpenSSL 3.1.0 14

    https://qa.1r1g.com/sf/ask/4353712891/ 
   

   延伸阅读

    	https://zhuanlan.zhihu.com/p/492913063 	
   

10. 联盟链新增节点