前面solc和web3编译和加载代码的步骤参考其他文章。

web3j中deploy代码

solidity代码

pragma solidity >0.4.18;

contract SimpleVoting {

bytes32[] public candidateList;

mapping (bytes32 => uint8) public votesReceived;

constructor(bytes32[] memory candidateNames) public {

candidateList = candidateNames;

}

function voteForCandidate(bytes32 candidate) public {

require(validCandidate(candidate));

votesReceived[candidate] += 1;

}

function totalVotesFor(bytes32 candidate) view public returns (uint8) {

require(validCandidate(candidate));

return votesReceived[candidate];

}

function validCandidate(bytes32 candidate) view public returns (bool) {

for(uint8 i = 0; i < candidateList.length; i++) {

if(candidateList[i] == candidate)

return true;

}

return false;

}

}

编译后的java代码(有些部分需要手动修改，后文会写道)：

package com.gason.blockchain.eth;

import java.math.BigInteger;

import java.util.Arrays;

import java.util.Collections;

import java.util.List;

import java.util.stream.Collector;

import java.util.stream.Collectors;

import org.web3j.abi.FunctionEncoder;

import org.web3j.abi.TypeReference;

import org.web3j.abi.datatypes.Bool;

import org.web3j.abi.datatypes.Function;

import org.web3j.abi.datatypes.Type;

import org.web3j.abi.datatypes.generated.Bytes32;

import org.web3j.abi.datatypes.generated.Uint8;

import org.web3j.crypto.Credentials;

import org.web3j.protocol.Web3j;

import org.web3j.protocol.core.RemoteCall;

import org.web3j.protocol.core.RemoteFunctionCall;

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 4.5.5.

*/

@SuppressWarnings("rawtypes")

public class SimpleVoting extends Contract {

private static final String BINARY = "";

public static final String FUNC_CANDIDATELIST = "candidateList";

public static final String FUNC_TOTALVOTESFOR = "totalVotesFor";

public static final String FUNC_VALIDCANDIDATE = "validCandidate";

public static final String FUNC_VOTEFORCANDIDATE = "voteForCandidate";

public static final String FUNC_VOTESRECEIVED = "votesReceived";

@Deprecated

protected SimpleVoting(String contractAddress, Web3j web3j, Credentials credentials, BigInteger gasPrice, BigInteger gasLimit) {

super(BINARY, contractAddress, web3j, credentials, gasPrice, gasLimit);

}

protected SimpleVoting(String contractAddress, Web3j web3j, Credentials credentials, ContractGasProvider contractGasProvider) {

super(BINARY, contractAddress, web3j, credentials, contractGasProvider);

}

@Deprecated

protected SimpleVoting(String contractAddress, Web3j web3j, TransactionManager transactionManager, BigInteger gasPrice, BigInteger gasLimit) {

super(BINARY, contractAddress, web3j, transactionManager, gasPrice, gasLimit);

}

protected SimpleVoting(String contractAddress, Web3j web3j, TransactionManager transactionManager, ContractGasProvider contractGasProvider) {

super(BINARY, contractAddress, web3j, transactionManager, contractGasProvider);

}

public RemoteFunctionCall candidateList(BigInteger param0) {

final Function function = new Function(

FUNC_CANDIDATELIST,

Arrays.asList(new org.web3j.abi.datatypes.generated.Uint256(param0)),

Arrays.>asList(new TypeReference() {

}));

return executeRemoteCallSingleValueReturn(function);

}

public RemoteFunctionCall totalVotesFor(String candidate) {

final Function function = new Function(

FUNC_TOTALVOTESFOR,

Arrays.asList(new org.web3j.abi.datatypes.generated.Bytes32(StrToByte(candidate))),

Arrays.>asList(new TypeReference() {

}));

return executeRemoteCallSingleValueReturn(function);

}

public RemoteFunctionCall validCandidate(String candidate) {

final Function function = new Function(

FUNC_VALIDCANDIDATE,

Arrays.asList(new org.web3j.abi.datatypes.generated.Bytes32(StrToByte(candidate))),

Arrays.>asList(new TypeReference() {

}));

return executeRemoteCallSingleValueReturn(function);

}

public RemoteFunctionCall voteForCandidate(String candidate) {

final Function function = new Function(

FUNC_VOTEFORCANDIDATE,

Arrays.asList(new org.web3j.abi.datatypes.generated.Bytes32(StrToByte(candidate))),

Collections.>emptyList());

return executeRemoteCallTransaction(function);

}

public RemoteFunctionCall votesReceived(byte[] param0) {

final Function function = new Function(

FUNC_VOTESRECEIVED,

Arrays.asList(new org.web3j.abi.datatypes.generated.Bytes32(param0)),

Collections.>emptyList());

return executeRemoteCallTransaction(function);

}

@Deprecated

public static SimpleVoting load(String contractAddress, Web3j web3j, Credentials credentials, BigInteger gasPrice, BigInteger gasLimit) {

return new SimpleVoting(contractAddress, web3j, credentials, gasPrice, gasLimit);

}

@Deprecated

public static SimpleVoting load(String contractAddress, Web3j web3j, TransactionManager transactionManager, BigInteger gasPrice, BigInteger gasLimit) {

return new SimpleVoting(contractAddress, web3j, transactionManager, gasPrice, gasLimit);

}

public static SimpleVoting load(String contractAddress, Web3j web3j, Credentials credentials, ContractGasProvider contractGasProvider) {

return new SimpleVoting(contractAddress, web3j, credentials, contractGasProvider);

}

public static SimpleVoting load(String contractAddress, Web3j web3j, TransactionManager transactionManager, ContractGasProvider contractGasProvider) {

return new SimpleVoting(contractAddress, web3j, transactionManager, contractGasProvider);

}

public static RemoteCall deploy(Web3j web3j, Credentials credentials, ContractGasProvider contractGasProvider, List candidateNames) {

String encodedConstructor = FunctionEncoder.encodeConstructor(Arrays.asList(new org.web3j.abi.datatypes.DynamicArray(

org.web3j.abi.datatypes.generated.Bytes32.class,

org.web3j.abi.Utils.typeMap(candidateNames, org.web3j.abi.datatypes.generated.Bytes32.class))));

return deployRemoteCall(SimpleVoting.class, web3j, credentials, contractGasProvider, BINARY, encodedConstructor);

}

public static RemoteCall deploy(Web3j web3j, TransactionManager transactionManager, ContractGasProvider contractGasProvider, List candidateNames) {

String encodedConstructor = FunctionEncoder.encodeConstructor(Arrays.asList(new org.web3j.abi.datatypes.DynamicArray(

org.web3j.abi.datatypes.generated.Bytes32.class,

org.web3j.abi.Utils.typeMap(candidateNames, org.web3j.abi.datatypes.generated.Bytes32.class))));

return deployRemoteCall(SimpleVoting.class, web3j, transactionManager, contractGasProvider, BINARY, encodedConstructor);

}

@Deprecated

public static RemoteCall deploy(Web3j web3j, Credentials credentials, BigInteger gasPrice, BigInteger gasLimit, List candidateNames) {

String encodedConstructor = FunctionEncoder.encodeConstructor(Arrays.asList(new org.web3j.abi.datatypes.DynamicArray(

org.web3j.abi.datatypes.generated.Bytes32.class,

org.web3j.abi.Utils.typeMap(candidateNames, org.web3j.abi.datatypes.generated.Bytes32.class))));

return deployRemoteCall(SimpleVoting.class, web3j, credentials, gasPrice, gasLimit, BINARY, encodedConstructor);

}

@Deprecated

public static RemoteCall deploy(Web3j web3j, TransactionManager transactionManager, BigInteger gasPrice, BigInteger gasLimit, List candidateNames) {

String encodedConstructor = FunctionEncoder.encodeConstructor(Arrays.asList(new org.web3j.abi.datatypes.DynamicArray(

org.web3j.abi.datatypes.generated.Bytes32.class,

org.web3j.abi.Utils.typeMap(candidateNames, org.web3j.abi.datatypes.generated.Bytes32.class))));

return deployRemoteCall(SimpleVoting.class, web3j, transactionManager, gasPrice, gasLimit, BINARY, encodedConstructor);

}

public static RemoteCall deployByString(Web3j web3j, Credentials credentials, ContractGasProvider contractGasProvider, List candidateNames) {

List candidateNamesByte = candidateNames.stream().map(val -> StrToByte(val)).collect(Collectors.toList());

String encodedConstructor = FunctionEncoder.encodeConstructor(Arrays.asList(new org.web3j.abi.datatypes.DynamicArray(

org.web3j.abi.datatypes.generated.Bytes32.class,

org.web3j.abi.Utils.typeMap(candidateNamesByte, org.web3j.abi.datatypes.generated.Bytes32.class))));

return deployRemoteCall(SimpleVoting.class, web3j, credentials, contractGasProvider, BINARY, encodedConstructor);

}

public static byte[] StrToByte(String str) {

byte[] byteValue = str.getBytes();

byte[] byteValueLen32 = new byte[32];

System.arraycopy(byteValue, 0, byteValueLen32, 0, byteValue.length);

return byteValueLen32;

}

}

使用java进行部署：

String pk="";//写你私钥

Web3j web3 = Web3j.build(new HttpService());

ContractGasProvider contractGasProvider = new DefaultGasProvider();

Credentials credentials = Credentials.create(pk);

List candidateNames = Arrays.asList("Bob", "Tom", "Jerry");

SimpleVoting registryContract = SimpleVoting.deployByString(web3, credentials, contractGasProvider, candidateNames).sendAsync().get();

// 合约地址，记得保存

System.out.println(registryContract.getContractAddress());

web3j中的方法调用

注意：solidity中的byte32[]类型与Java中String的转换，String需要转为byte32[]

public static byte[] StrToByte(String str) {

byte[] byteValue = str.getBytes();

byte[] byteValueLen32 = new byte[32];

System.arraycopy(byteValue, 0, byteValueLen32, 0, byteValue.length);

return byteValueLen32;

}

无返回值

solidity代码：

function voteForCandidate(bytes32 candidate) public {

require(validCandidate(candidate));

votesReceived[candidate] += 1;

}

java编译后：

executeRemoteCallTransaction无返回值,Function中第一个参数为函数名，第二个为输入参数集合，第二为返回参数集合，如果无返回参数，就输入 Collections.>emptyList()

public RemoteFunctionCall voteForCandidate(String candidate) {

final Function function = new Function(

"voteForCandidate",

Arrays.asList(new org.web3j.abi.datatypes.generated.Bytes32(StrToByte(candidate))),

Collections.>emptyList());

return executeRemoteCallTransaction(function);

}

调用：

Web3j web3 = Web3j.build(new HttpService()); // defaults to http://localhost:8545/

ContractGasProvider contractGasProvider = new DefaultGasProvider();

//PK为你的私钥

Credentials credentials = Credentials.create(PK);

//address为你之前部署后返回的合约地址

SimpleVoting registryContract = SimpleVoting.load(address, web3, credentials, contractGasProvider);

registryContract.voteForCandidate("Bob").sendAsync().get();

单个参数返回

solidity:

function totalVotesFor(bytes32 candidate) view public returns (uint8) {

require(validCandidate(candidate));

return votesReceived[candidate];

}

java编译后，executeRemoteCallSingleValueReturn为单个参数返回,

public RemoteFunctionCall totalVotesFor(String candidate) {

final Function function = new Function(

"totalVotesFor",

Arrays.asList(new org.web3j.abi.datatypes.generated.Bytes32(StrToByte(candidate))),

Arrays.>asList(new TypeReference() {

}));

return executeRemoteCallSingleValueReturn(function);

}

调用：

Web3j web3 = Web3j.build(new HttpService()); // defaults to http://localhost:8545/

ContractGasProvider contractGasProvider = new DefaultGasProvider();

Credentials credentials = Credentials.create(PK);

SimpleVoting registryContract = SimpleVoting.load(address, web3, credentials, contractGasProvider);

System.out.println(registryContract.totalVotesFor("Bob").sendAsync().get().getValue());

多参数返回

solidity代码：

pragma solidity >0.4.0;

// 官方文档众筹实现

// https://solidity.readthedocs.io/en/develop/types.html#structs

// 独立实现

contract CrowdFunding {

// 众筹项目

struct Fund {

// 众筹地址

address owner;

// 众筹描述

string desc;

// 众筹目标

uint goal;

// 已筹金币

uint coins;

// 是否结束

bool finished;

// 捐赠人数

uint recordCounts;

// 捐赠记录

mapping(uint => Record) records;

// 原本使用 Record[] records 数组定义

// 但是貌似目前版本尚不支持

// 于是将 数组 拆分成 长度 + 映射

// https://solidity.readthedocs.io/en/develop/types.html#mappings

}

// 捐赠记录

struct Record {

// 捐赠成员

address member;

// 捐赠金币

uint coin;

// 捐赠时间

uint time;

}

// 众筹地址列表

Fund[] funds;

// 获取众筹项目数量

function getFundCount() public view returns (uint) {

return funds.length;

}

// 获取众筹项目信息

// 参数：项目编号

// 返回：众筹地址 众筹描述 众筹目标 已筹金币 是否结束

function getFundInfo(uint fundIndex) public view returns (address, string memory, uint, uint, bool) {

Fund storage fund = funds[fundIndex];

return (fund.owner, fund.desc, fund.goal, fund.coins, fund.finished);

}

// 获取众筹捐赠人数

function getRecordCount(uint fundIndex) public view returns (uint) {

return funds[fundIndex].recordCounts;

}

// 获取众筹捐赠记录

// 参数：项目编号 记录编号

// 返回：捐赠成员 捐赠金币 捐赠时间

function getRecordInfo(uint fundIndex, uint recordIndex) public view returns (address, uint, uint) {

Record storage record = funds[fundIndex].records[recordIndex];

return (record.member, record.coin, record.time);

}

// 为自己发起众筹

function raiseFund(string memory info, uint goal) public {

funds.push(Fund(msg.sender, info, goal, 0, false, 0));

}

// 为别人发送金币

// https://solidity.readthedocs.io/en/latest/miscellaneous.html#modifiers

// payable for functions: Allows them to receive Ether together with a call.

function sendCoin(uint fundIndex) public payable {

// 默认属性

// msg.sender 转账账户

// msg.value 转账数目

// 智能合约默认单位 wei

// 1 ether = 10^18 wei

// 引用拷贝

Fund storage fund = funds[fundIndex];

require(!fund.finished);

// 转账 失败自动退出

address(uint256(fund.owner)).transfer(msg.value);

// 更新众筹信息

fund.coins += msg.value;

fund.records[fund.recordCounts++] = Record(msg.sender, msg.value, now);

fund.finished = fund.coins >= fund.goal * 1 ether ? true : false;

}

// 回退函数 防止抛出异常

// https://solidity.readthedocs.io/en/latest/contracts.html#fallback-function

// if you want your contract to receive Ether, you have to implement a fallback function.

// 后面两个函数是最新版本编译器所需要的，可能跟网上一些不一样

fallback () external payable { }

receive() external payable { }

}

java编译后(部分通过手工修改)：

package com.gason.blockchain.eth;

import org.web3j.abi.FunctionEncoder;

import org.web3j.abi.TypeReference;

import org.web3j.abi.datatypes.*;

import org.web3j.abi.datatypes.generated.Uint256;

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.gas.ContractGasProvider;

import org.web3j.utils.Convert;

import java.math.BigInteger;

import java.util.Arrays;

import java.util.List;

public class CrowdFundingContract extends Contract implements CrowdFundingInterface {

private static final String BINARY = "";

/**

* CrowdFunding合约

*

* @param contractAddress 合约地址

* @param web3j RPC请求

* @param credentials 钱包凭证

* @param gasPrice GAS价格

* @param gasLimit GAS上限

*/

private CrowdFundingContract(String contractAddress, Web3j web3j, Credentials credentials, BigInteger gasPrice,

BigInteger gasLimit) {

super(BINARY, contractAddress, web3j, credentials, gasPrice, gasLimit);

}

protected CrowdFundingContract(String contractAddress, Web3j web3j, Credentials credentials, ContractGasProvider contractGasProvider) {

super(BINARY, contractAddress, web3j, credentials, contractGasProvider);

}

/**

* 部署合约

*

* @param web3j RPC请求

* @param credentials 钱包凭证

* @param gasPrice GAS价格

* @param gasLimit GAS上限

* @return

*/

public static RemoteCall deploy(Web3j web3j, Credentials credentials, BigInteger gasPrice, BigInteger gasLimit) {

// 构造函数传参 NULL

String encodedConstructor = FunctionEncoder.encodeConstructor(Arrays.asList());

return deployRemoteCall(CrowdFundingContract.class, web3j, credentials, gasPrice, gasLimit, BINARY, encodedConstructor);

}

public static RemoteCall deploy(Web3j web3j, Credentials credentials, ContractGasProvider contractGasProvider) {

return deployRemoteCall(CrowdFundingContract.class, web3j, credentials, contractGasProvider, BINARY, "");

}

/**

* 加载合约

*

* @param contractAddress 合约地址

* @param web3j RPC请求

* @param credentials 钱包凭证

* @param gasPrice GAS价格

* @param gasLimit GAS上限

* @return

*/

public static CrowdFundingContract load(String contractAddress, Web3j web3j, Credentials credentials, BigInteger gasPrice, BigInteger gasLimit) {

return new CrowdFundingContract(contractAddress, web3j, credentials, gasPrice, gasLimit);

}

public static CrowdFundingContract load(String contractAddress, Web3j web3j, Credentials credentials, ContractGasProvider contractGasProvider) {

return new CrowdFundingContract(contractAddress, web3j, credentials, contractGasProvider);

}

//

// crowdfunding.sol //

//

/**

* 获取众筹项目数量

* rinfo.get(0).getValue().toString()

* function getFundCount() public view returns (uint)

*/

@Override

public RemoteCall getFundCount() {

Function function = new Function("getFundCount", Arrays.asList(),

Arrays.>asList(new TypeReference() {

}));

return executeRemoteCallSingleValueReturn(function);

}

/**

* 获取众筹项目信息

* function getFundInfo(uint fundIndex) public view returns (address, string, uint, uint, bool)

*/

@Override

public RemoteCall> getFundInfo(int fundIndex) {

Function function = new Function("getFundInfo", Arrays.asList(new Uint256(fundIndex)),

Arrays.>asList(new TypeReference

() {

}, new TypeReference() {

}, new TypeReference() {

}, new TypeReference() {

}, new TypeReference() {

}));

return executeRemoteCallMultipleValueReturn(function);

}

/**

* 获取众筹捐赠人数

* function getRecordCount(uint fundIndex) public view returns (uint)

*/

@Override

public RemoteCall getRecordCount(int fundIndex) {

Function function = new Function("getRecordCount", Arrays.asList(new Uint256(fundIndex)),

Arrays.>asList(new TypeReference() {

}));

return executeRemoteCallSingleValueReturn(function);

}

/**

* 获取众筹捐赠记录

* function getRecordInfo(uint fundIndex, uint recordIndex) public view returns (address, uint, uint)

*/

@Override

public RemoteCall> getRecordInfo(int fundIndex, int recordIndex) {

Function function = new Function("getRecordInfo", Arrays.asList(new Uint256(fundIndex), new Uint256(recordIndex)),

Arrays.>asList(new TypeReference

() {

}, new TypeReference() {

}, new TypeReference() {

}));

return executeRemoteCallMultipleValueReturn(function);

}

/**

* 为自己发起众筹

* function raiseFund(string desc, uint goal) public

*/

@Override

public RemoteCall raiseFund(String desc, int goal) {

Function function = new Function("raiseFund", Arrays.asList(new Utf8String(desc), new Uint256(goal)),

Arrays.>asList());

return executeRemoteCallTransaction(function);

}

/**

* 为别人发送金币

* function sendCoin(uint fundIndex) public payable

*/

@Override

public RemoteCall sendCoin(int fundIndex, int coin) {

Function function = new Function("sendCoin", Arrays.asList(new Uint256(fundIndex)),

Arrays.>asList());

return executeRemoteCallTransaction(function, BigInteger.valueOf(coin).multiply(Convert.Unit.ETHER.getWeiFactor().toBigInteger()));

}

}

调用：

Web3j web3 = Web3j.build(new HttpService()); // defaults to http://localhost:8545/

ContractGasProvider contractGasProvider = new DefaultGasProvider();

Credentials credentials = Credentials.create(PK);

CrowdFundingContract registryContract = CrowdFundingContract.load(address, web3, credentials, contractGasProvider);

List outputs = registryContract.getFundInfo(0).sendAsync().get();

System.out.println("address:" + outputs.get(0).toString());

System.out.println("desc:" + outputs.get(1).toString());

System.out.println("goal:" + Integer.parseInt(outputs.get(2).getValue().toString()));

System.out.println("coins:" + new BigInteger(outputs.get(3).getValue().toString()).divide(Convert.Unit.ETHER.getWeiFactor().toBigInteger()).intValue());

System.out.println("finished:" + Boolean.parseBoolean(outputs.get(4).getValue().toString()));

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