FISCO BCOS开发第一个区块链应用--小白实战
官方链接
简单的步骤直接跳过了，主要是记录下整个过程中出现问题最多的地方
4. 创建区块链应用项目
第一步. 安装环境
首先，我们需要安装JDK以及集成开发环境
首先，在官网上下载JDK14（JDK1.8 至JDK 14都支持）并安装
然后，修改环境变量
视频讲解
文字步骤
# 确认您当前的java版本
$ java -version
# 确认您的java路径
$ ls /Library/Java/JavaVirtualMachines
# 返回
# jdk-14.0.2.jdk
# 如果使用的是bash
$ vim .bash_profile
# 在文件中加入JAVA_HOME的路径
# export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk-14.0.2.jdk/Contents/Home
$ source .bash_profile
# 如果使用的是zash
$ vim .zashrc
# 在文件中加入JAVA_HOME的路径
# export JAVA_HOME = Library/Java/JavaVirtualMachines/jdk-14.0.2.jdk/Contents/Home
$ source .zashrc
# 确认您的java版本
$ java -version
# 返回
# java version "14.0.2" 2020-07-14
# Java(TM) SE Runtime Environment (build 14.0.2+12-46)
# Java HotSpot(TM) 64-Bit Server VM (build 14.0.2+12-46, mixed mode, sharing)进入IntelliJ IDE官网，下载并安装社区版IntelliJ IDE
（我把idea装ubantu里面了，虽然一开始有点卡，扩了2g内存就可以了。还是觉得这样比较方便简单一点。。毕竟师兄给我讲了一遍，我没听懂）
安装链接
安装完后要创建一个快捷方式，这样就不需要每次启动的时候去目录下执行
创建快捷方式链接
第二步. 创建一个Java工程
在IntelliJ IDE中创建一个gradle项目，勾选Gradle和Java，并输入工程名
第三步. 引入FISCO BCOS Java SDK
在build.gradle文件中的 dependencies下加入对FISCO BCOS Java SDK的引用。
repositories {
mavenCentral()
maven {
allowInsecureProtocol = true
url "http://maven.aliyun.com/nexus/content/groups/public/"
}
maven {
allowInsecureProtocol = true
url "https://oss.sonatype.org/content/repositories/snapshots"
}
}引入Java SDK jar包
testImplementation group: 'junit', name: 'junit', version: '4.12'
implementation ('org.fisco-bcos.java-sdk:fisco-bcos-java-sdk:2.9.0')第四步. 配置SDK证书
修改build.gradle文件，引入Spring框架，
def spring_version = "4.3.27.RELEASE"
List spring = [
"org.springframework:spring-core:$spring_version",
"org.springframework:spring-beans:$spring_version",
"org.springframework:spring-context:$spring_version",
"org.springframework:spring-tx:$spring_version",
]
dependencies {
testImplementation group: 'junit', name: 'junit', version: '4.12'
implementation ("org.fisco-bcos.java-sdk:fisco-bcos-java-sdk:2.9.0")
implementation spring
}在 asset-app/test/resources目录下创建配置文件 applicationContext.xml，写入配置内容。
（官方图）
applicationContext.xml的内容如下：
在以上配置文件中，我们指定了证书存放的位certPath的值为conf。接下来我们需要把SDK用于连接节点的证书放到指定的conf目录下。
# 假设我们将asset-app放在~/fisco目录下 进入~/fisco目录
$ cd ~/fisco
# 创建放置证书的文件夹
$ mkdir -p asset-app/src/test/resources/conf
# 拷贝节点证书到项目的资源目录
$ cp -r nodes/127.0.0.1/sdk/* asset-app/src/test/resources/conf
# 若在IDE直接运行，拷贝证书到resources路径
$ mkdir -p asset-app/src/main/resources/conf
$ cp -r nodes/127.0.0.1/sdk/* asset-app/src/main/resources/conf这里注意！！！假设我们将 asset-app 放在~fisco目录下
一开始的默认地址并不是 fisco !!!
5. 业务逻辑开发
上面我们已经介绍了如何在自己的项目中引入以及配置Java SDK，本节介绍如何通过Java程序调用合约，同样以示例的资产管理说明。
第一步.将3编译好的Java合约引入项目中
cd ~/fisco
# 将编译好的合约Java类引入项目中。
cp console/contracts/sdk/java/org/fisco/bcos/asset/contract/Asset.java asset-app/src/main/java/org/fisco/bcos/asset/contract/Asset.java（官方图）
第二步.开发业务逻辑
在路径/src/main/java/org/fisco/bcos/asset/client目录下，创建AssetClient.java类，通过调用Asset.java实现对合约的部署与调用
这里出现了一个小问题：client 是我自己新建的，但是当要创建AssetClient.java类的时候，提示 client是只读文件，使用了网上的方法也不管用，后面我想到这也是ubuntu里的文件呀，就去终端看了下，发现文件夹确实是带着小锁的。解决方法
AssetClient.java 代码如下：
package org.fisco.bcos.asset.client;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.math.BigInteger;
import java.util.List;
import java.util.Properties;
import org.fisco.bcos.asset.contract.Asset;
import org.fisco.bcos.sdk.BcosSDK;
import org.fisco.bcos.sdk.abi.datatypes.generated.tuples.generated.Tuple2;
import org.fisco.bcos.sdk.client.Client;
import org.fisco.bcos.sdk.crypto.keypair.CryptoKeyPair;
import org.fisco.bcos.sdk.model.TransactionReceipt;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
public class AssetClient {
static Logger logger = LoggerFactory.getLogger(AssetClient.class);
private BcosSDK bcosSDK;
private Client client;
private CryptoKeyPair cryptoKeyPair;
public void initialize() throws Exception {
@SuppressWarnings("resource")
ApplicationContext context =
new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
bcosSDK = context.getBean(BcosSDK.class);
client = bcosSDK.getClient(1);
cryptoKeyPair = client.getCryptoSuite().createKeyPair();
client.getCryptoSuite().setCryptoKeyPair(cryptoKeyPair);
logger.debug("create client for group1, account address is " + cryptoKeyPair.getAddress());
}
public void deployAssetAndRecordAddr() {
try {
Asset asset = Asset.deploy(client, cryptoKeyPair);
System.out.println(
" deploy Asset success, contract address is " + asset.getContractAddress());
recordAssetAddr(asset.getContractAddress());
} catch (Exception e) {
// TODO Auto-generated catch block
// e.printStackTrace();
System.out.println(" deploy Asset contract failed, error message is " + e.getMessage());
}
}
public void recordAssetAddr(String address) throws FileNotFoundException, IOException {
Properties prop = new Properties();
prop.setProperty("address", address);
final Resource contractResource = new ClassPathResource("contract.properties");
FileOutputStream fileOutputStream = new FileOutputStream(contractResource.getFile());
prop.store(fileOutputStream, "contract address");
}
public String loadAssetAddr() throws Exception {
// load Asset contact address from contract.properties
Properties prop = new Properties();
final Resource contractResource = new ClassPathResource("contract.properties");
prop.load(contractResource.getInputStream());
String contractAddress = prop.getProperty("address");
if (contractAddress == null || contractAddress.trim().equals("")) {
throw new Exception(" load Asset contract address failed, please deploy it first. ");
}
logger.info(" load Asset address from contract.properties, address is {}", contractAddress);
return contractAddress;
}
public void queryAssetAmount(String assetAccount) {
try {
String contractAddress = loadAssetAddr();
Asset asset = Asset.load(contractAddress, client, cryptoKeyPair);
Tuple2 result = asset.select(assetAccount);
if (result.getValue1().compareTo(new BigInteger("0")) == 0) {
System.out.printf(" asset account %s, value %s \n", assetAccount, result.getValue2());
} else {
System.out.printf(" %s asset account is not exist \n", assetAccount);
}
} catch (Exception e) {
// TODO Auto-generated catch block
// e.printStackTrace();
logger.error(" queryAssetAmount exception, error message is {}", e.getMessage());
System.out.printf(" query asset account failed, error message is %s\n", e.getMessage());
}
}
public void registerAssetAccount(String assetAccount, BigInteger amount) {
try {
String contractAddress = loadAssetAddr();
Asset asset = Asset.load(contractAddress, client, cryptoKeyPair);
TransactionReceipt receipt = asset.register(assetAccount, amount);
List response = asset.getRegisterEventEvents(receipt);
if (!response.isEmpty()) {
if (response.get(0).ret.compareTo(new BigInteger("0")) == 0) {
System.out.printf(
" register asset account success => asset: %s, value: %s \n", assetAccount, amount);
} else {
System.out.printf(
" register asset account failed, ret code is %s \n", response.get(0).ret.toString());
}
} else {
System.out.println(" event log not found, maybe transaction not exec. ");
}
} catch (Exception e) {
// TODO Auto-generated catch block
// e.printStackTrace();
logger.error(" registerAssetAccount exception, error message is {}", e.getMessage());
System.out.printf(" register asset account failed, error message is %s\n", e.getMessage());
}
}
public void transferAsset(String fromAssetAccount, String toAssetAccount, BigInteger amount) {
try {
String contractAddress = loadAssetAddr();
Asset asset = Asset.load(contractAddress, client, cryptoKeyPair);
TransactionReceipt receipt = asset.transfer(fromAssetAccount, toAssetAccount, amount);
List response = asset.getTransferEventEvents(receipt);
if (!response.isEmpty()) {
if (response.get(0).ret.compareTo(new BigInteger("0")) == 0) {
System.out.printf(
" transfer success => from_asset: %s, to_asset: %s, amount: %s \n",
fromAssetAccount, toAssetAccount, amount);
} else {
System.out.printf(
" transfer asset account failed, ret code is %s \n", response.get(0).ret.toString());
}
} else {
System.out.println(" event log not found, maybe transaction not exec. ");
}
} catch (Exception e) {
// TODO Auto-generated catch block
// e.printStackTrace();
logger.error(" registerAssetAccount exception, error message is {}", e.getMessage());
System.out.printf(" register asset account failed, error message is %s\n", e.getMessage());
}
}
public static void Usage() {
System.out.println(" Usage:");
System.out.println(
"\t java -cp conf/:lib/*:apps/* org.fisco.bcos.asset.client.AssetClient deploy");
System.out.println(
"\t java -cp conf/:lib/*:apps/* org.fisco.bcos.asset.client.AssetClient query account");
System.out.println(
"\t java -cp conf/:lib/*:apps/* org.fisco.bcos.asset.client.AssetClient register account value");
System.out.println(
"\t java -cp conf/:lib/*:apps/* org.fisco.bcos.asset.client.AssetClient transfer from_account to_account amount");
System.exit(0);
}
public static void main(String[] args) throws Exception {
if (args.length < 1) {
Usage();
}
AssetClient client = new AssetClient();
client.initialize();
switch (args[0]) {
case "deploy":
client.deployAssetAndRecordAddr();
break;
case "query":
if (args.length < 2) {
Usage();
}
client.queryAssetAmount(args[1]);
break;
case "register":
if (args.length < 3) {
Usage();
}
client.registerAssetAccount(args[1], new BigInteger(args[2]));
break;
case "transfer":
if (args.length < 4) {
Usage();
}
client.transferAsset(args[1], args[2], new BigInteger(args[3]));
break;
default:
{
Usage();
}
}
System.exit(0);
}
} 在 asset-app/tool目录下添加一个调用AssetClient的脚本 asset_run.sh
#!/bin/bash
function usage()
{
echo " Usage : "
echo " bash asset_run.sh deploy"
echo " bash asset_run.sh query asset_account "
echo " bash asset_run.sh register asset_account asset_amount "
echo " bash asset_run.sh transfer from_asset_account to_asset_account amount "
echo " "
echo " "
echo "examples : "
echo " bash asset_run.sh deploy "
echo " bash asset_run.sh register Asset0 10000000 "
echo " bash asset_run.sh register Asset1 10000000 "
echo " bash asset_run.sh transfer Asset0 Asset1 11111 "
echo " bash asset_run.sh query Asset0"
echo " bash asset_run.sh query Asset1"
exit 0
}
case $1 in
deploy)
[ $# -lt 1 ] && { usage; }
;;
register)
[ $# -lt 3 ] && { usage; }
;;
transfer)
[ $# -lt 4 ] && { usage; }
;;
query)
[ $# -lt 2 ] && { usage; }
;;
*)
usage
;;
esac
java -Djdk.tls.namedGroups="secp256k1" -cp 'apps/*:conf/:lib/*' org.fisco.bcos.asset.client.AssetClient $@接着，配置好 log。在asset-app/src/test/resources目录下创建log4j.properties
### set log levels ###
log4j.rootLogger=DEBUG, file
### output the log information to the file ###
log4j.appender.file=org.apache.log4j.DailyRollingFileAppender
log4j.appender.file.DatePattern='_'yyyyMMddHH'.log'
log4j.appender.file.File=./log/sdk.log
log4j.appender.file.Append=true
log4j.appender.file.filter.traceFilter=org.apache.log4j.varia.LevelRangeFilter
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=[%p] [%-d{yyyy-MM-dd HH:mm:ss}] %C{1}.%M(%L) | %m%n
###output the log information to the console ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=[%p] [%-d{yyyy-MM-dd HH:mm:ss}] %C{1}.%M(%L) | %m%n 接着，通过配置gradle中的Jar命令，指定复制和编译任务。并引入日志库，在asset-app/src/test/resources目录下，创建一个空的contract.properties文件，用于应用在运行时存放合约地址。
（官方图片）
dependencies {
testCompile group: 'junit', name: 'junit', version: '4.12'
compile ("org.fisco-bcos.java-sdk:fisco-bcos-java-sdk:2.9.0")
compile spring
compile ('org.slf4j:slf4j-log4j12:1.7.25')
runtime ('org.slf4j:slf4j-log4j12:1.7.25')
}
jar {
destinationDir file('dist/apps')
archiveName project.name + '.jar'
exclude '**/*.xml'
exclude '**/*.properties'
exclude '**/*.crt'
exclude '**/*.key'
doLast {
copy {
from configurations.runtime
into 'dist/lib'
}
copy {
from file('src/test/resources/')
into 'dist/conf'
}
copy {
from file('tool/')
into 'dist/'
}
copy {
from file('src/test/resources/contract')
into 'dist/contract'
}
}
}至此，我们已经完成了这个应用的开发。
6. 运行应用
至此我们已经介绍使用区块链开发资产管理应用的所有流程并实现了功能，接下来可以运行项目，测试功能是否正常。
1.编译
# 切换到项目目录
$ cd ~/fisco/asset-app
# 编译项目
$ ./gradlew build注意上面的 切换到项目目录，自己的 asset-app 在哪 ，就切到哪
编译成功之后，将在项目根目录下生成 dist目录。dist目录下有一个asset_run.sh脚本，简化项目运行。现在开始一一验证本文开始定下的需求。
2.部署Asset.sol合约
# 进入dist目录
$ cd dist
$ bash asset_run.sh deploy这里我出现了一些警告，我看有人说是jdk版本过高，无伤大雅，以后再看吧
3.注册资产
给张三注册资产10万元
$ bash asset_run.sh register zhangsan 100000注册成功，张三拥有资产10万元
同上，也给张五注册资产10万元
$ bash asset_run.sh register Bob 100000
Register account successfully => account: Bob, value: 1000004.查询资产
查询张三的资产有多少
$ bash asset_run.sh query zhangsan张三拥有10万资产
张五同上。
5.资产转移
张三转给张五 5万 块
$ bash asset_run.sh transfer zhangsan zhangwu 50000转移成功
检查张三还剩多少钱
$ bash asset_run.sh query zhangsan张三还剩 5 万。
检查张五还有多少钱
$ bash asset_run.sh query zhangwu张五有 15 万
