Solidity编译器和简单调试

1 安装 Solidity 编译器

1.1 通过 docker 安装Solc

搜索docker的Solc镜像

docker search –no-trunc ethereum/solc

通过docker安装Solc

docker pull docker.io/ethereum/solc:stable

1.2 运行Solc容器

运行如下命令

docker run –rm -it –privileged=true –net=host -v /home/hpbroot/ethereum_go/contract:/contract –name solc ethereum/solc:stable –version

查看是否成功

2 新建spring boot工程

2.1 通过Eclipse新建工程

首先，新建ContractCompile工程

在springboot配置文件application.properties中添加如下

1web3j.contract.solcCmd=docker run --rm -it --privileged=true --net=host -v /home/hpbroot/ethereum_go/contract:/contract --name solc ethereum/solc:stable 2在pom文件添加依赖 3<dependency> 4 <groupId>org.ethereum</groupId> 5 <artifactId>solcJ-all</artifactId> 6 <version>0.4.10</version> 7</dependency>

新建ContractConfig类

1@Component 2@ConfigurationProperties(prefix = "web3j.contract") 3public class ContractConfig { 4 private String solcCmd; 5 public String getSolcCmd() { 6 return solcCmd; 7 } 8 public void setSolcCmd(String solcCmd) { 9 this.solcCmd = solcCmd; 10 } 11}

2.2 调用 智能合约 编译器的 代码

1String soliditySrcCode =MapUtils.getString(preParam, "soliditySrcCode"); 2if(StringUtils.isBlank(soliditySrcCode)) { 3 param.put(ContractConstant.RETURN_CODE, ContractConstant.ERROR_CODE); 4 param.put(ContractConstant.RETURN_MSG, ContractConstant.NOSRCCODE); 5 return param; 6} 7SolidityCompiler solidityCompiler = SolidityCompiler.getInstance(getLog(),contractConfig.getSolcCmd()); 8byte[] source = soliditySrcCode.getBytes(StandardCharsets.UTF_8); 9CompilerResult compilerResult = solidityCompiler.compileSrc(source, 10SolidityCompiler.Options.ABI, SolidityCompiler.Options.BIN); 11param.put(ContractConstant.RETURN_CODE, ContractConstant.SUCCESS_CODE); 12param.put(ContractConstant.RETURN_MSG, ContractConstant.SUCCESS_MSG); 13if(compilerResult.isFailed()) { 14 param.put(ContractConstant.RETURN_CODE, ContractConstant.ERROR_CODE); 15 param.put(ContractConstant.RETURN_MSG, compilerResult.getErrors()); 16}

2.3 调用编译智能合约源文件的代码

2.3.1 编写智能合约源码

1contract SampleRecipientSuccess { 2 address public from; 3 uint256 public value; 4 address public tokenContract; 5 bytes public extraData; 6 event ReceivedApproval(uint256 _value); 7 function receiveApproval(address _from, uint256 _value, address _tokenContract, bytes _extraData) { 8 from = _from; 9 value = _value; 10 tokenContract = _tokenContract; 11 extraData = _extraData; 12 ReceivedApproval(_value); 13 } 14}

2.3.2 通过HTTP调用智能合约的J2EE组件

1String contractPath="/SampleRecipientSuccess.sol"; 2 String contractString = FileUtils.readFileToString(new File(contractPath),StandardCharsets.UTF_8); 3 HashMap<String, Object> hashMap = new HashMap<String,Object>(); 4 hashMap.put("soliditySrcCode", contractString); 5 String url = "http://192.168.3.43:18080/ContractCompile/compileContractCmd"; 6 ResponseEntity<Map> postForEntity = getRestTemplate().postForEntity(url, hashMap, Map.class); 7 Map body = postForEntity.getBody(); 8 String returnCode = MapUtils.getString(body, ContractConstant.RETURN_CODE); 9 if(ContractConstant.SUCCESS_CODE.equals(returnCode)) { 10 String result = MapUtils.getString(body, "result"); 11 Map<String, Object> parseResult = parseResult(result); 12 System.out.println(AppObjectUtil.toJson(parseResult)); 13 }

2.3.3 智能合约编译器组件返回的编译数据

1{ 2 "abis": [{ 3 "constant": true, 4 "inputs": [], 5 "name": "value", 6 "outputs": [{ 7 "name": "", 8 "type": "uint256" 9 }], 10 "payable": false, 11 "type": "function" 12 }, { 13 "constant": true, 14 "inputs": [], 15 "name": "tokenContract", 16 "outputs": [{ 17 "name": "", 18 "type": "address" 19 }], 20 "payable": false, 21 "type": "function" 22 }, { 23 "constant": true, 24 "inputs": [], 25 "name": "extraData", 26 "outputs": [{ 27 "name": "", 28 "type": "bytes" 29 }], 30 "payable": false, 31 "type": "function" 32 }, { 33 "constant": false, 34 "inputs": [{ 35 "name": "_from", 36 "type": "address" 37 }, { 38 "name": "_value", 39 "type": "uint256" 40 }, { 41 "name": "_tokenContract", 42 "type": "address" 43 }, { 44 "name": "_extraData", 45 "type": "bytes" 46 }], 47 "name": "receiveApproval", 48 "outputs": [], 49 "payable": false, 50 "type": "function" 51 }, { 52 "constant": true, 53 "inputs": [], 54 "name": "from", 55 "outputs": [{ 56 "name": "", 57 "type": "address" 58 }], 59 "payable": false, 60 "type": "function" 61 }, { 62 "anonymous": false, 63 "inputs": [{ 64 "indexed": false, 65 "name": "_value", 66 "type": "uint256" 67 }], 68 "name": "ReceivedApproval", 69 "type": "event" 70 }], 71 "bin": 72 "6060604052341561000c57fe5b5b6103d38061001c6000396000f300606060405263ffffffff60e 73 060020a6000350416633fa4f245811461004d57806355a373d61461006f578063609d33341461009 74 b5780638f4ffcb11461012b578063d5ce338914610199575bfe5b341561005557fe5b61005d6101c 75 5565b60408051918252519081900360200190f35b341561007757fe5b61007f6101cb565b6040805 76 1600160a060020a039092168252519081900360200190f35b34156100a357fe5b6100ab6101da565 77 b6040805160208082528351818301528351919283929083019185019080838382156100f1575b805 78 1825260208311156100f157601f1990920191602091820191016100d1565b5050509050908101906 79 01f16801561011d5780820380516001836020036101000a031916815260200191505b50925050506 80 0405180910390f35b341561013357fe5b604080516020600460643581810135601f8101849004840 81 285018401909552848452610197948235600160a060020a039081169560248035966044359093169 82 594608494929391019190819084018382808284375094965061026895505050505050565b005b341 83 56101a157fe5b61007f6102f8565b60408051600160a060020a03909216825251908190036020019 84 0f35b60015481565b600254600160a060020a031681565b600380546040805160206002600185161 85 5610100026000190190941693909304601f810184900484028201840190925281815292918301828 86 280156102605780601f1061023557610100808354040283529160200191610260565b82019190600 87 0526020600020905b81548152906001019060200180831161024357829003601f168201915b50505 88 0505081565b60008054600160a060020a0380871673fffffffffffffffffffffffffffffffffffff 89 fff19928316179092556001859055600280549285169290911691909117905580516102bd9060039 90 06020840190610307565b506040805184815290517f2db24179b782aab7c5ab64add7f84d4f6c845 91 d0779695371f29be1f658d043cd9181900360200190a15b50505050565b600054600160a060020a0 92 31681565b828054600181600116156101000203166002900490600052602060002090601f0160209 93 00481019282601f1061034857805160ff1916838001178555610375565b828001600101855582156 94 10375579182015b8281111561037557825182559160200191906001019061035a565b5b506103829 95 29150610386565b5090565b6103a491905b80821115610382576000815560010161038c565b50905 96 65b905600a165627a7a723058209522849948e8cc25a7d6717d5c10836c97c36425936be5edf3992 97 06b3e5d7fa30029" 98}

总结

通过J2EE组件的接口调用，可以为大多数基于 java 的区块链 应用 提供了便利，可以利用J2EE成熟稳定的框架无缝集成到项目中，也是为了以后安卓开发和联盟链提供在线编译智能合约功能，如果是私有的局域网络的企业级联盟链，可以发布该智能合约的J2EE组件到该局域网的机器上去，可以实现联盟中的智能合约统一的编译器，便于快速升级编译器。

感谢 HPB 团队整理。