将solidity智能合约打包成Java代码 |
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将solidity智能合约打包成Java代码
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合约代码
先准备好一份合约代码如下： 合约的功能是实现简单的用户管理，包括 注册功能 登录功能 修改密码 获得用户信息 获得系统用户总数 pragma solidity >= 0.5.0; contract UserManagerment { // 用户结构体 struct User { address ethAddr; string userName; bytes32 password; } // 合约部署者地址 address host; // 保存所有用户 User[] userInfos; // 用户名到是否注册的映射 mapping(string => bool) registerPool; // 用户名到用户的映射 mapping(string => User) userPool; // 构造函数 设置合约拥有者地址 constructor() public { host = msg.sender; } // 登录功能 function doLogin(string memory userName, string memory password) public view returns (bool) { return userPool[userName].password == keccak256(abi.encode(password)); } // 注册检测 function checkRegister(string memory userName) public view returns (bool) { return registerPool[userName]; } // 用户注册 function register(address ethAddr, string memory userName, string memory password) public { // 检查用户是否注册 当 require() 中的条件值为假时抛出异常,异常信息为：“用户已经注册” require(!checkRegister(userName),"用户已经注册！"); // 保存注册信息 userPool[userName] = User(ethAddr, userName, keccak256(abi.encode(password))); // 设置用户名为已经注册 registerPool[userName] = true; // 添加到用户数组中 userInfos.push(userPool[userName]); } // 更新密码 function updatePassword(string memory userName, string memory newPwd) public { // keccak256加密 userPool[userName].password = keccak256(abi.encode(newPwd)); } // 获得用户信息 function getUserInfoByUserName(string memory userName) public view returns (address,string memory){ require(registerPool[userName],"未查到该用户信息"); User storage user = userPool[userName]; return (user.ethAddr,user.userName); } // 获得所有用户信息 function getAllUserInfos(uint index)public view returns (address,string memory){ // 检查下表范围 require(index < userInfos.length,"下标越界"); // 检查用户权限，只有合约创建者才能执行该操作 require(msg.sender == host,"非法访问"); // 取出用户信息 User storage user = userInfos[index]; // 返回数据 return (user.ethAddr,user.userName); } // 获得系统用户数 function getTotalUserNum() public view returns (uint){ // 检查用户权限，只有合约创建者才能执行该操作 require(msg.sender == host,"非法访问"); return userInfos.length; } } 编译合约由于使用的VS Code编辑器，安装的插件solidity0.0.72可以直接按F5编译
编译后，在文件夹根目录生成了bin文件夹。里头的内容如下：
下载web3j命令行工具 下载连接：点击直达
2. 解压工具包
注：可以将bin文件夹路径添加到系统环境变量中，这样省得之后进入bin目录使用命令
3. 进入文件夹bin目录 输入如下命令： web3j solidity generate /path/to/.bin /path/to/.abi -o /path/to/src/main/java -p com.your.organisation.name说明： /path/to/.bin 智能合约编译后的生成物 /path/to/.abi 智能合约编译后的生成物 -o /path/to/src/main/java 输出路径 -p com.your.organisation.name 打包的包名举例： web3j solidity generate E:\BlockChain\Solidity\bin\UserManagerment.bin E:\BlockChain\Solidity\bin\UserManagerment.abi -o E:\Web3j -p com.my.contract
输出结果：
修改Java代码 上述操作生成的UserManagerment.java内容如下： package com.my.contract; import java.math.BigInteger; import java.util.Arrays; import java.util.Collections; import org.web3j.abi.TypeReference; import org.web3j.abi.datatypes.Function; import org.web3j.abi.datatypes.Type; import org.web3j.crypto.Credentials; import org.web3j.protocol.Web3j; import org.web3j.protocol.core.RemoteCall; import org.web3j.protocol.core.methods.response.TransactionReceipt; import org.web3j.tx.Contract; import org.web3j.tx.TransactionManager; import org.web3j.tx.gas.ContractGasProvider; /** ** Auto generated code. * * Do not modify! * * Please use the web3j * command line tools, or the * org.web3j.codegen.SolidityFunctionWrapperGenerator in the * codegen * module to update. * * * Generated with web3j version 3.6.0. */ public class UserManagerment extends Contract { private static final String BINARY = 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public static final String FUNC_CHECKREGISTER = "checkRegister"; public static final String FUNC_DOLOGIN = "doLogin"; public static final String FUNC_GETALLUSERINFOS = "getAllUserInfos"; public static final String FUNC_GETTOTALUSERNUM = "getTotalUserNum"; public static final String FUNC_GETUSERINFOBYUSERNAME = "getUserInfoByUserName"; public static final String FUNC_REGISTER = "register"; public static final String FUNC_UPDATEPASSWORD = "updatePassword"; @Deprecated protected UserManagerment(String contractAddress, Web3j web3j, Credentials credentials, BigInteger gasPrice, BigInteger gasLimit) { super(BINARY, contractAddress, web3j, credentials, gasPrice, gasLimit); } protected UserManagerment(String contractAddress, Web3j web3j, Credentials credentials, ContractGasProvider contractGasProvider) { super(BINARY, contractAddress, web3j, credentials, contractGasProvider); } @Deprecated protected UserManagerment(String contractAddress, Web3j web3j, TransactionManager transactionManager, BigInteger gasPrice, BigInteger gasLimit) { super(BINARY, contractAddress, web3j, transactionManager, gasPrice, gasLimit); } protected UserManagerment(String contractAddress, Web3j web3j, TransactionManager transactionManager, ContractGasProvider contractGasProvider) { super(BINARY, contractAddress, web3j, transactionManager, contractGasProvider); } public static RemoteCall deploy(Web3j web3j, Credentials credentials, ContractGasProvider contractGasProvider) { return deployRemoteCall(UserManagerment.class, web3j, credentials, contractGasProvider, BINARY, ""); } public static RemoteCall deploy(Web3j web3j, TransactionManager transactionManager, ContractGasProvider contractGasProvider) { return deployRemoteCall(UserManagerment.class, web3j, transactionManager, contractGasProvider, BINARY, ""); } @Deprecated public static RemoteCall deploy(Web3j web3j, Credentials credentials, BigInteger gasPrice, BigInteger gasLimit) { return deployRemoteCall(UserManagerment.class, web3j, credentials, gasPrice, gasLimit, BINARY, ""); } @Deprecated public static RemoteCall deploy(Web3j web3j, TransactionManager transactionManager, BigInteger gasPrice, BigInteger gasLimit) { return deployRemoteCall(UserManagerment.class, web3j, transactionManager, gasPrice, gasLimit, BINARY, ""); } public RemoteCall checkRegister(String userName) { final Function function = new Function(FUNC_CHECKREGISTER, Arrays.asList(new org.web3j.abi.datatypes.Utf8String(userName)), Collections.>emptyList()); return executeRemoteCallTransaction(function); } public RemoteCall getAllUserInfos(BigInteger index) { final Function function = new Function(FUNC_GETALLUSERINFOS, Arrays.asList(new org.web3j.abi.datatypes.generated.Uint256(index)), Collections.>emptyList()); return executeRemoteCallTransaction(function); } public RemoteCall getUserInfoByUserName(String userName) { final Function function = new Function(FUNC_GETUSERINFOBYUSERNAME, Arrays.asList(new org.web3j.abi.datatypes.Utf8String(userName)), Collections.>emptyList()); return executeRemoteCallTransaction(function); } public RemoteCall updatePassword(String userName, String newPwd) { final Function function = new Function(FUNC_UPDATEPASSWORD, Arrays.asList(new org.web3j.abi.datatypes.Utf8String(userName), new org.web3j.abi.datatypes.Utf8String(newPwd)), Collections.>emptyList()); return executeRemoteCallTransaction(function); } public RemoteCall doLogin(String userName, String password) { final Function function = new Function(FUNC_DOLOGIN, Arrays.asList(new org.web3j.abi.datatypes.Utf8String(userName), new org.web3j.abi.datatypes.Utf8String(password)), Collections.>emptyList()); return executeRemoteCallTransaction(function); } public RemoteCall getTotalUserNum() { final Function function = new Function(FUNC_GETTOTALUSERNUM, Arrays.asList(), Collections.>emptyList()); return executeRemoteCallTransaction(function); } public RemoteCall register(String ethAddr, String userName, String password) { final Function function = new Function(FUNC_REGISTER, Arrays.asList(new org.web3j.abi.datatypes.Address(ethAddr), new org.web3j.abi.datatypes.Utf8String(userName), new org.web3j.abi.datatypes.Utf8String(password)), Collections.>emptyList()); return executeRemoteCallTransaction(function); } 自定义的函数介绍 举例说明： public RemoteCall checkRegister(String userName) { final Function function = new Function(FUNC_CHECKREGISTER, Arrays.asList(new org.web3j.abi.datatypes.Utf8String(userName)), Collections.>emptyList()); return executeRemoteCallTransaction(function); }合约中我们定义的是返回Bool值，所以要修改如下几处内容：
修改后内容： public RemoteCall checkRegister(String userName) { final Function function = new Function(FUNC_CHECKREGISTER, Arrays.asList(new org.web3j.abi.datatypes.Utf8String(userName)), Arrays.>asList(new TypeReference() { })); return executeRemoteCallSingleValueReturn(function); } public RemoteCall doLogin(String userName, String password) { final Function function = new Function(FUNC_DOLOGIN, Arrays.asList(new org.web3j.abi.datatypes.Utf8String(userName), new org.web3j.abi.datatypes.Utf8String(password)), Arrays.>asList(new TypeReference() { }, new TypeReference() { })); return executeRemoteCallMultipleValueReturn(function); } public RemoteCall getTotalUserNum() { final Function function = new Function(FUNC_GETTOTALUSERNUM, Arrays.asList(), Arrays.>asList(new TypeReference() { }, new TypeReference() { })); return executeRemoteCallMultipleValueReturn(function); } public RemoteCall register(String ethAddr, String userName, String password) { final Function function = new Function(FUNC_REGISTER, Arrays.asList(new org.web3j.abi.datatypes.Address(ethAddr), new org.web3j.abi.datatypes.Utf8String(userName), new org.web3j.abi.datatypes.Utf8String(password)), Collections.>emptyList()); return executeRemoteCallTransaction(function); } /**************************************** END ********************************************************/ @Deprecated public static UserManagerment load(String contractAddress, Web3j web3j, Credentials credentials, BigInteger gasPrice, BigInteger gasLimit) { return new UserManagerment(contractAddress, web3j, credentials, gasPrice, gasLimit); } @Deprecated public static UserManagerment load(String contractAddress, Web3j web3j, TransactionManager transactionManager, BigInteger gasPrice, BigInteger gasLimit) { return new UserManagerment(contractAddress, web3j, transactionManager, gasPrice, gasLimit); } public static UserManagerment load(String contractAddress, Web3j web3j, Credentials credentials, ContractGasProvider contractGasProvider) { return new UserManagerment(contractAddress, web3j, credentials, contractGasProvider); } public static UserManagerment load(String contractAddress, Web3j web3j, TransactionManager transactionManager, ContractGasProvider contractGasProvider) { return new UserManagerment(contractAddress, web3j, transactionManager, contractGasProvider); } }部署和调用 启动私链 （不再介绍，看之前记录） 部署合约
Consts.java public class Consts { // GAS价格 public static BigInteger GAS_PRICE = BigInteger.valueOf(2000_000_000L); // GAS上限 public static BigInteger GAS_LIMIT = BigInteger.valueOf(4_300_000L); // 交易费用 public static BigInteger GAS_VALUE = BigInteger.valueOf(100_000L);; // 账户密码 public static String PASSWORD = "123"; // 账户文件路径 public static String PATH = "E:/BlockChain/node5/data/keystore/UTC--2020-04-11T07-54-54.678177700Z--12d4e53d6f017a2a62807876ec41fc97a0f60a71"; // 合约地址，第一次部署之后记录下来 public static String ADDRESS = "0x2e2d63186093b543d9f84a3f8343c59a3047718f"; // chain id,在创世区块中定义的 public static byte CHAINID = (byte) 666; }DeployedContract.java public class DeployedContract { public static void main(String[] args) throws Exception { // 1. 默认连接到 http://localhost:8545/ Web3j web3j = Web3j.build(new HttpService()); // 2. 获取凭证 Credentials credentials = WalletUtils.loadCredentials(Consts.PASSWORD, Consts.PATH); // 3.部署合约 UserManagerment contract = UserManagerment.deploy(web3j, credentials, Consts.GAS_PRICE, Consts.GAS_LIMIT).send(); // 4.获得合约地址 System.out.println(contract.getContractAddress()); } }
Main.java public class Main { public static void main(String[] args) throws Exception { // 1.默认连接到 http://localhost:8545/ Web3j web3j = Web3j.build(new HttpService()); // 2.获取凭证 Credentials credentials = WalletUtils.loadCredentials(Consts.PASSWORD, Consts.PATH); // 3.加载合约 UserManagerment contract = UserManagerment.load(Consts.ADDRESS, web3j, credentials, Consts.GAS_PRICE, Consts.GAS_LIMIT); // 4.调用合约 // 检查注册 Boolean isRegister = contract.checkRegister("张三").send().getValue(); System.out.println("用户名‘张三’是否被注册：" + isRegister); // 注册 contract.register("0x2e2d63186093b543d9f84a3f8343c59a3047718f", "张三", "123").send(); isRegister = contract.checkRegister("张三").send().getValue(); System.out.println("用户名‘张三’是否被注册：" + isRegister); // 登录 Boolean canLogin = contract.doLogin("张三", "123").send().getValue(); if (canLogin) { System.out.println("登录成功"); } else { System.out.println("登录失败"); } // 获得用户信息 System.out.println("张三信息如下："); List userInfo = contract.getUserInfoByUserName("张三").send(); for (Type info : userInfo) { System.out.println(info.toString()); } // 系统用户人数 int userNum = contract.getTotalUserNum().send().getValue().intValue(); System.out.println("总共的用户数：" + userNum); // 输出所有用户信息 for (int i = 0; i < userNum; i++) { List user = contract.getAllUserInfos(i).send(); for (Type info : user) { System.out.println(info.toString()); } } // 5.关闭连接 web3j.shutdown(); } }
运行结果：
https://blog.csdn.net/maohuihua123/article/details/105455683
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