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：

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.