一、搭建区块链
使用的是FISCO BCOS 和 WeBASE-Front来搭建区块链，详细教程：
https://blog.csdn.net/yueyue763184/article/details/128924144?spm=1001.2014.3001.5501
搭建好能达到下图效果即可：
二、部署智能合约与导出java文件、SDK证书下载
1.创建测试用户，导出pem文件
点击“测试用户”，即可“新增用户”。
点击“导出”，选择.pem文件。
2.编译部署智能合约，导出java文件和SDK证书下载
在“合约IDE”中准备智能合约，新建合约文件，合约名称是Asset。
pragma solidity ^0.4.25;
contract Asset {
address public issuer;
mapping (address => uint) public balances;
event Sent(address from, address to, uint amount);
constructor() {
issuer = msg.sender;
}
function issue(address receiver, uint amount) public {
if (msg.sender != issuer) return;
balances[receiver] += amount;
}
function send(address receiver, uint amount) public {
if (balances[msg.sender] < amount) return;
balances[msg.sender] -= amount;
balances[receiver] += amount;
emit Sent(msg.sender, receiver, amount);
}
}
合约IDE会自动保存的，点击“编译”、“部署”后即可得到合约地址contractAddress。
点击“导出java文件”，一般命名与合约名称相同为Asset;
点击“SDK证书下载”；
得到的文件如下：
三、在SpringBoot项目中调用智能合约
1.首先创建SpringBoot项目
2.在pom文件中导入相关依赖
<!-- web -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- test -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- fisco bcos -->
<dependency>
<groupId>org.fisco-bcos.java-sdk</groupId>
<artifactId>fisco-bcos-java-sdk</artifactId>
<version>2.9.1</version>
</dependency>3.将下载的相关文件导入对应的文件目录（sdk要先解压）
4.在application.yaml配置文件编写fisco的配置
注意：要将路径和合约地址换成自己的
fisco:
nodeList: 192.168.119.138:20201
groupId: 1
certPath: src\main\resources\sdk
contractAddress:
# Asset合约地址(一定要加引号 不然注解@Value会把按照16进制数字进行转换赋值)
asset: "0xc6053e4f71cdcf14e31cc1031263cee4e1ac7768"
# 测试用户地址
account:
# 测试用户秘钥地址
accountAddress: src\main\resources\account
# 测试用户文件地址
accountFilePath: src\main\resources\account\buliangshuai_key_0x3a456344e952d0275e5e4af4766abb450d3b45ac.pem
说明：
fisco.nodeList：区块链节点的ip和端口；
fisco.groupId：组ID；
fisco.certPath：证书保存目录；
fisco.contractAddress.asset：合约地址；
fisco.contractAddress.account.accountAddress：测试用户地址；
fisco.contractAddress.account.accountFilePath：测试用户的pem文件地址；
5.编写sdk访问合约方法
在client包中创建2个类，一个是环境配置类ApplicationContext
package com.fisco.bcos.asset.client;
import org.fisco.bcos.sdk.BcosSDK;
import org.fisco.bcos.sdk.client.Client;
import org.fisco.bcos.sdk.config.ConfigOption;
import org.fisco.bcos.sdk.config.exceptions.ConfigException;
import org.fisco.bcos.sdk.config.model.ConfigProperty;
import org.fisco.bcos.sdk.crypto.CryptoSuite;
import org.fisco.bcos.sdk.crypto.keypair.CryptoKeyPair;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* @Description: 配置类
*/
@Configuration
public class ApplicationContext {
@Value("${fisco.nodeList}")
private String nodeLists;
@Value("${fisco.groupId}")
private Integer groupId;
@Value("${fisco.certPath}")
private String certPath;
@Value("${fisco.account.accountFilePath}")
private String accountFilePath;
@Bean(name = "configProperty")
public ConfigProperty defaultConfigProperty() {
ConfigProperty property = new ConfigProperty();
// 配置cryptoMaterial
Map<String, Object> cryptoMaterialMap = new HashMap<>();
cryptoMaterialMap.put("certPath", certPath);
property.setCryptoMaterial(cryptoMaterialMap);
// 配置network
Map<String, Object> networkMap = new HashMap<>();
String[] split = nodeLists.split(",");
List<String> nodeList = Arrays.asList(split);
networkMap.put("peers", nodeList);
property.setNetwork(networkMap);
// 配置account
Map<String, Object> accountMap = new HashMap<>();
accountMap.put("keyStoreDir", "account");
accountMap.put("accountAddress", "");
accountMap.put("accountFileFormat", "pem");
accountMap.put("password", "");
accountMap.put("accountFilePath", accountFilePath);
property.setAccount(accountMap);
//配置 threadPool
Map<String, Object> threadPoolMap = new HashMap<>();
threadPoolMap.put("channelProcessorThreadSize", "16");
threadPoolMap.put("receiptProcessorThreadSize", "16");
threadPoolMap.put("maxBlockingQueueSize", "102400");
property.setThreadPool(threadPoolMap);
return property;
}
@Bean(name = "configOption")
public ConfigOption defaultConfigOption(ConfigProperty configProperty) throws ConfigException {
return new ConfigOption(configProperty);
}
@Bean(name = "bcosSDK")
public BcosSDK bcosSDK(ConfigOption configOption) {
return new BcosSDK(configOption);
}
@Bean(name = "client")
public Client getClient(BcosSDK bcosSDK) {
// 为群组初始化client
Client client = bcosSDK.getClient(groupId);
return client;
}
@Bean
public CryptoKeyPair getCryptoKeyPair(Client client) {
// 如果有密钥文件 那么每次读取的就不再是随机的
CryptoSuite cryptoSuite = client.getCryptoSuite();
CryptoKeyPair cryptoKeyPair = cryptoSuite.getCryptoKeyPair();
return cryptoKeyPair;
}
}
另一个是合约客户端类AssetClient
package com.fisco.bcos.asset.client;
import com.fisco.bcos.asset.contract.Asset;
import org.fisco.bcos.sdk.BcosSDK;
import org.fisco.bcos.sdk.client.Client;
import org.fisco.bcos.sdk.crypto.keypair.CryptoKeyPair;
import org.fisco.bcos.sdk.model.TransactionReceipt;
import org.fisco.bcos.sdk.model.callback.TransactionCallback;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import java.math.BigInteger;
@Component
public class AssetClient {
@Autowired
private BcosSDK bcosSDK;
@Autowired
private Client client;
@Autowired
private CryptoKeyPair cryptoKeyPair;
@Value("${fisco.contractAddress.asset}")
private String contractAddress;
/**
* 发布资产（条件：当前用户是Asset合约发布者）
* @param receiver 接收者地址
* @param amount 资产数量
*/
public void issueAsset(String receiver, BigInteger amount) {
Asset asset = Asset.load(contractAddress, client, cryptoKeyPair);
asset.issue(receiver, amount, new CallbackResponse());
}
/**
* 发送资产（条件：发送者的账号Balance必须大于等于amount）
* @param receiver 接收者地址
* @param amount 资产数量
*/
public void sendAsset(String receiver, BigInteger amount) {
Asset asset = Asset.load(contractAddress, client, cryptoKeyPair);
asset.send(receiver, amount, new CallbackResponse());
}
private class CallbackResponse extends TransactionCallback {
@Override
public void onResponse(TransactionReceipt transactionReceipt) {
System.out.println("回调结果：");
System.out.println(transactionReceipt.getContractAddress());
System.out.println(transactionReceipt.getFrom());
System.out.println(transactionReceipt.getGasUsed());
System.out.println(transactionReceipt.getRemainGas());
System.out.println(transactionReceipt.getStatus());
System.out.println(transactionReceipt.getMessage());
System.out.println(transactionReceipt.getStatusMsg());
}
}
}
6.编写测试类调用智能合约函数
首先编写测试类AssetClientTest
package com.fisco.bcos.asset.client;
import com.fisco.bcos.asset.AssetDemo1Application;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import java.math.BigInteger;
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = AssetDemo1Application.class)
public class AssetClientTest {
@Autowired
private AssetClient assetClient;
@Test
public void testIssueAsset() throws InterruptedException {
String receiver = "0xc6053e4f71cdcf14e31cc1031263cee4e1ac7768";
BigInteger amount = new BigInteger("10000");
assetClient.issueAsset(receiver, amount);
Thread.sleep(5000);
System.out.println("发布成功！");
}
@Test
public void testSendAsset() throws InterruptedException {
String receiver = "0xc6053e4f71cdcf14e31cc1031263cee4e1ac7768";
BigInteger amount = new BigInteger("50000");
assetClient.sendAsset(receiver, amount);
Thread.sleep(5000);
System.out.println("发送成功！");
}
}
测试的步骤：
1）先后执行testIssueAsset和testSendAsset测试方法，该测试要保证服务器的20200、20201端口是开放的，命令如下：
firewall-cmd --zone=public --add-port=20201/tcp --permanent # 开放端口
firewall-cmd --zone=public --remove-port=20201/tcp --permanent #关闭端口
firewall-cmd --reload # 配置立即生效
firewall-cmd --zone=public --list-ports # 查看防火墙所有开放的端口
2）执行成功后，在节点控制台的“合约列表”中找到对应的合约，点击“合约调用”，选择balances方法；
结果如下：
文章来源：https://www.toymoban.com/news/detail-778334.html
以上就是在Fisco区块链上部署智能合约，并通过Java SDK调用智能合约函数的示例.文章来源地址https://www.toymoban.com/news/detail-778334.html
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