Solidity合约生成Java接口代码

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安装solc工具，这个工具可以使合约代码的xxx.sol文件生成对应的.abi和.bin文件，这两个文件是后续生成java接口的关键，如果没有npm命令，需要安装nodejs

npm install -g solc

下载web3j工具，这个工具可以将.abi和.bin文件，转成java接口

https://github.com/web3j/web3j/releases

如果上面的链接下载不对，需要跳转到web3j-cli版本

https://github.com/web3j/web3j-cli/releases

操作步骤

解压下载的web3j工具，文件夹内会包含bin和lib两个文件夹

在文件夹内创建一个文件ERC20.sol

输入标准的ERC20接口代码

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

interface IERC20 {

    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function transfer(address recipient, uint256 amount) external returns (bool);

    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);

    event Approval(address indexed owner, address indexed spender, uint256 value);
}

interface IERC20Metadata is IERC20 {
    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function decimals() external view returns (uint8);
}

开始生成bin和abi文件

solcjs ERC20.sol --bin --abi

命令执行完成之后会出现以下文件

ERC20_sol_Context.abi
ERC20_sol_Context.bin
ERC20_sol_IERC20.abi
ERC20_sol_IERC20.bin
ERC20_sol_IERC20Metadata.abi
ERC20_sol_IERC20Metadata.bin

我们只需要最外层也就是IERC20的bin和abi，它包含其它的bin和abi

使用web3j工具，生成java代码

-o .生成在当前目录 -p com.akersman生成代码的包名

bin/web3j solidity generate ERC20_sol_IERC20.bin ERC20_sol_IERC20.abi -o . -p com.akersman

web3j-cli版本web3j需要这样输入

bin/web3j generate solidity -b ERC20_sol_IERC20.bin -a ERC20_sol_IERC20.abi -o . -p com.akersman

控制台显示如下就生成成功了


              _      _____ _     _
             | |    |____ (_)   (_)
__      _____| |__      / /_     _   ___
\ \ /\ / / _ \ '_ \     \ \ |   | | / _ \
 \ V  V /  __/ |_) |.___/ / | _ | || (_) |
  \_/\_/ \___|_.__/ \____/| |(_)|_| \___/
                         _/ |
                        |__/

Generating com.akersman.ERC20_sol_IERC20 ... File written to .

此时文件夹内会出现一个com文件夹，进入到com/akersman目录下，看到ERC20_sol_IERC20.java文件

这个文件就是对应的java接口代码

package com.akersman;

import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import org.web3j.abi.EventEncoder;
import org.web3j.abi.TypeReference;
import org.web3j.abi.datatypes.Address;
import org.web3j.abi.datatypes.Event;
import org.web3j.abi.datatypes.Function;
import org.web3j.abi.datatypes.Type;
import org.web3j.abi.datatypes.generated.Uint256;
import org.web3j.crypto.Credentials;
import org.web3j.protocol.Web3j;
import org.web3j.protocol.core.DefaultBlockParameter;
import org.web3j.protocol.core.RemoteCall;
import org.web3j.protocol.core.methods.request.EthFilter;
import org.web3j.protocol.core.methods.response.Log;
import org.web3j.protocol.core.methods.response.TransactionReceipt;
import org.web3j.tx.Contract;
import org.web3j.tx.TransactionManager;
import org.web3j.tx.gas.ContractGasProvider;
import rx.Observable;
import rx.functions.Func1;

/**
 * <p>Auto generated code.
 * <p><strong>Do not modify!</strong>
 * <p>Please use the <a href="https://docs.web3j.io/command_line.html">web3j command line tools</a>,
 * or the org.web3j.codegen.SolidityFunctionWrapperGenerator in the 
 * <a href="https://github.com/web3j/web3j/tree/master/codegen">codegen module</a> to update.
 *
 * <p>Generated with web3j version 3.6.0.
 */
public class ERC20_sol_IERC20 extends Contract {
    private static final String BINARY = "";

    public static final String FUNC_ALLOWANCE = "allowance";

    public static final String FUNC_APPROVE = "approve";

    public static final String FUNC_BALANCEOF = "balanceOf";

    public static final String FUNC_TOTALSUPPLY = "totalSupply";

    public static final String FUNC_TRANSFER = "transfer";

    public static final String FUNC_TRANSFERFROM = "transferFrom";

    public static final Event APPROVAL_EVENT = new Event("Approval", 
            Arrays.<TypeReference<?>>asList(new TypeReference<Address>(true) {}, new TypeReference<Address>(true) {}, new TypeReference<Uint256>() {}));
    ;

    public static final Event TRANSFER_EVENT = new Event("Transfer", 
            Arrays.<TypeReference<?>>asList(new TypeReference<Address>(true) {}, new TypeReference<Address>(true) {}, new TypeReference<Uint256>() {}));
    ;

    @Deprecated
    protected ERC20_sol_IERC20(String contractAddress, Web3j web3j, Credentials credentials, BigInteger gasPrice, BigInteger gasLimit) {
        super(BINARY, contractAddress, web3j, credentials, gasPrice, gasLimit);
    }

    protected ERC20_sol_IERC20(String contractAddress, Web3j web3j, Credentials credentials, ContractGasProvider contractGasProvider) {
        super(BINARY, contractAddress, web3j, credentials, contractGasProvider);
    }

    @Deprecated
    protected ERC20_sol_IERC20(String contractAddress, Web3j web3j, TransactionManager transactionManager, BigInteger gasPrice, BigInteger gasLimit) {
        super(BINARY, contractAddress, web3j, transactionManager, gasPrice, gasLimit);
    }

    protected ERC20_sol_IERC20(String contractAddress, Web3j web3j, TransactionManager transactionManager, ContractGasProvider contractGasProvider) {
        super(BINARY, contractAddress, web3j, transactionManager, contractGasProvider);
    }

    public List<ApprovalEventResponse> getApprovalEvents(TransactionReceipt transactionReceipt) {
        List<Contract.EventValuesWithLog> valueList = extractEventParametersWithLog(APPROVAL_EVENT, transactionReceipt);
        ArrayList<ApprovalEventResponse> responses = new ArrayList<ApprovalEventResponse>(valueList.size());
        for (Contract.EventValuesWithLog eventValues : valueList) {
            ApprovalEventResponse typedResponse = new ApprovalEventResponse();
            typedResponse.log = eventValues.getLog();
            typedResponse.owner = (String) eventValues.getIndexedValues().get(0).getValue();
            typedResponse.spender = (String) eventValues.getIndexedValues().get(1).getValue();
            typedResponse.value = (BigInteger) eventValues.getNonIndexedValues().get(0).getValue();
            responses.add(typedResponse);
        }
        return responses;
    }

    public Observable<ApprovalEventResponse> approvalEventObservable(EthFilter filter) {
        return web3j.ethLogObservable(filter).map(new Func1<Log, ApprovalEventResponse>() {
            @Override
            public ApprovalEventResponse call(Log log) {
                Contract.EventValuesWithLog eventValues = extractEventParametersWithLog(APPROVAL_EVENT, log);
                ApprovalEventResponse typedResponse = new ApprovalEventResponse();
                typedResponse.log = log;
                typedResponse.owner = (String) eventValues.getIndexedValues().get(0).getValue();
                typedResponse.spender = (String) eventValues.getIndexedValues().get(1).getValue();
                typedResponse.value = (BigInteger) eventValues.getNonIndexedValues().get(0).getValue();
                return typedResponse;
            }
        });
    }

    public Observable<ApprovalEventResponse> approvalEventObservable(DefaultBlockParameter startBlock, DefaultBlockParameter endBlock) {
        EthFilter filter = new EthFilter(startBlock, endBlock, getContractAddress());
        filter.addSingleTopic(EventEncoder.encode(APPROVAL_EVENT));
        return approvalEventObservable(filter);
    }

    public List<TransferEventResponse> getTransferEvents(TransactionReceipt transactionReceipt) {
        List<Contract.EventValuesWithLog> valueList = extractEventParametersWithLog(TRANSFER_EVENT, transactionReceipt);
        ArrayList<TransferEventResponse> responses = new ArrayList<TransferEventResponse>(valueList.size());
        for (Contract.EventValuesWithLog eventValues : valueList) {
            TransferEventResponse typedResponse = new TransferEventResponse();
            typedResponse.log = eventValues.getLog();
            typedResponse.from = (String) eventValues.getIndexedValues().get(0).getValue();
            typedResponse.to = (String) eventValues.getIndexedValues().get(1).getValue();
            typedResponse.value = (BigInteger) eventValues.getNonIndexedValues().get(0).getValue();
            responses.add(typedResponse);
        }
        return responses;
    }

    public Observable<TransferEventResponse> transferEventObservable(EthFilter filter) {
        return web3j.ethLogObservable(filter).map(new Func1<Log, TransferEventResponse>() {
            @Override
            public TransferEventResponse call(Log log) {
                Contract.EventValuesWithLog eventValues = extractEventParametersWithLog(TRANSFER_EVENT, log);
                TransferEventResponse typedResponse = new TransferEventResponse();
                typedResponse.log = log;
                typedResponse.from = (String) eventValues.getIndexedValues().get(0).getValue();
                typedResponse.to = (String) eventValues.getIndexedValues().get(1).getValue();
                typedResponse.value = (BigInteger) eventValues.getNonIndexedValues().get(0).getValue();
                return typedResponse;
            }
        });
    }

    public Observable<TransferEventResponse> transferEventObservable(DefaultBlockParameter startBlock, DefaultBlockParameter endBlock) {
        EthFilter filter = new EthFilter(startBlock, endBlock, getContractAddress());
        filter.addSingleTopic(EventEncoder.encode(TRANSFER_EVENT));
        return transferEventObservable(filter);
    }

    public RemoteCall<TransactionReceipt> allowance(String owner, String spender) {
        final Function function = new Function(
                FUNC_ALLOWANCE, 
                Arrays.<Type>asList(new org.web3j.abi.datatypes.Address(owner), 
                new org.web3j.abi.datatypes.Address(spender)), 
                Collections.<TypeReference<?>>emptyList());
        return executeRemoteCallTransaction(function);
    }

    public RemoteCall<TransactionReceipt> approve(String spender, BigInteger amount) {
        final Function function = new Function(
                FUNC_APPROVE, 
                Arrays.<Type>asList(new org.web3j.abi.datatypes.Address(spender), 
                new org.web3j.abi.datatypes.generated.Uint256(amount)), 
                Collections.<TypeReference<?>>emptyList());
        return executeRemoteCallTransaction(function);
    }

    public RemoteCall<TransactionReceipt> balanceOf(String account) {
        final Function function = new Function(
                FUNC_BALANCEOF, 
                Arrays.<Type>asList(new org.web3j.abi.datatypes.Address(account)), 
                Collections.<TypeReference<?>>emptyList());
        return executeRemoteCallTransaction(function);
    }

    public RemoteCall<TransactionReceipt> totalSupply() {
        final Function function = new Function(
                FUNC_TOTALSUPPLY, 
                Arrays.<Type>asList(), 
                Collections.<TypeReference<?>>emptyList());
        return executeRemoteCallTransaction(function);
    }

    public RemoteCall<TransactionReceipt> transfer(String recipient, BigInteger amount) {
        final Function function = new Function(
                FUNC_TRANSFER, 
                Arrays.<Type>asList(new org.web3j.abi.datatypes.Address(recipient), 
                new org.web3j.abi.datatypes.generated.Uint256(amount)), 
                Collections.<TypeReference<?>>emptyList());
        return executeRemoteCallTransaction(function);
    }

    public RemoteCall<TransactionReceipt> transferFrom(String sender, String recipient, BigInteger amount) {
        final Function function = new Function(
                FUNC_TRANSFERFROM, 
                Arrays.<Type>asList(new org.web3j.abi.datatypes.Address(sender), 
                new org.web3j.abi.datatypes.Address(recipient), 
                new org.web3j.abi.datatypes.generated.Uint256(amount)), 
                Collections.<TypeReference<?>>emptyList());
        return executeRemoteCallTransaction(function);
    }

    public static RemoteCall<ERC20_sol_IERC20> deploy(Web3j web3j, Credentials credentials, ContractGasProvider contractGasProvider) {
        return deployRemoteCall(ERC20_sol_IERC20.class, web3j, credentials, contractGasProvider, BINARY, "");
    }

    @Deprecated
    public static RemoteCall<ERC20_sol_IERC20> deploy(Web3j web3j, Credentials credentials, BigInteger gasPrice, BigInteger gasLimit) {
        return deployRemoteCall(ERC20_sol_IERC20.class, web3j, credentials, gasPrice, gasLimit, BINARY, "");
    }

    public static RemoteCall<ERC20_sol_IERC20> deploy(Web3j web3j, TransactionManager transactionManager, ContractGasProvider contractGasProvider) {
        return deployRemoteCall(ERC20_sol_IERC20.class, web3j, transactionManager, contractGasProvider, BINARY, "");
    }

    @Deprecated
    public static RemoteCall<ERC20_sol_IERC20> deploy(Web3j web3j, TransactionManager transactionManager, BigInteger gasPrice, BigInteger gasLimit) {
        return deployRemoteCall(ERC20_sol_IERC20.class, web3j, transactionManager, gasPrice, gasLimit, BINARY, "");
    }

    @Deprecated
    public static ERC20_sol_IERC20 load(String contractAddress, Web3j web3j, Credentials credentials, BigInteger gasPrice, BigInteger gasLimit) {
        return new ERC20_sol_IERC20(contractAddress, web3j, credentials, gasPrice, gasLimit);
    }

    @Deprecated
    public static ERC20_sol_IERC20 load(String contractAddress, Web3j web3j, TransactionManager transactionManager, BigInteger gasPrice, BigInteger gasLimit) {
        return new ERC20_sol_IERC20(contractAddress, web3j, transactionManager, gasPrice, gasLimit);
    }

    public static ERC20_sol_IERC20 load(String contractAddress, Web3j web3j, Credentials credentials, ContractGasProvider contractGasProvider) {
        return new ERC20_sol_IERC20(contractAddress, web3j, credentials, contractGasProvider);
    }

    public static ERC20_sol_IERC20 load(String contractAddress, Web3j web3j, TransactionManager transactionManager, ContractGasProvider contractGasProvider) {
        return new ERC20_sol_IERC20(contractAddress, web3j, transactionManager, contractGasProvider);
    }

    public static class ApprovalEventResponse {
        public Log log;

        public String owner;

        public String spender;

        public BigInteger value;
    }

    public static class TransferEventResponse {
        public Log log;

        public String from;

        public String to;

        public BigInteger value;
    }
}

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最后编辑时间为: 2022/08/09 08:05