Cypherium Java Smart Contract Tutorial

Run your cypher Node accord to the README file begin,update the txBlockNumber and keyBlockNumber to the latest number.

CypherTestBin Tutorial for running your cypher Node

Environmental configuration

Cypherium’s Java Smart Contract system need JDK1.8 support.So Please install JDK1.8. To learn how to configure the environment of JDK1.8, refer to Java’s online literature.

After you have configured your JDK environment, execute javac --version in the Console environment to confirm whcpher it is 1.8.xxx.Below install commands is for ubuntu:

sudo apt install openjdk-8-jre-headless -y
sudo apt install openjdk-8-jdk-headless
javac -version

Download repository

 git clone https://github.com/cypherium/ContractExample.git

Write and Compile smart contract

Before you want to deploy smart contract,you should confirm your account'cosin is enough (1000000000000000000 around), if no,please take part in pow work to become a committee member to get reward or contact us to transfer some to you.

cph.getBalance(cph.accounts[0])//cph.getBalance("0x461f9d24b10edca41c1d9296f971c5c028e6c64c")

Ok,as all the ready word has been done,we can create one simple smart contract as follows:

import javax.cypher.Cypnet;
import mjson.Json;

public class _cypher_contract {

	static Json defj = Json.object();

    public static void main(String[] args) {
        long totalSupply = 10000;
	    System.out.println("main");
		//Set token information
		Cypnet.setTokenInfo("HR", "HR Coin", totalSupply, "" );
       // Cypnet.changeBalance("caller", totalSupply);

	}
	......

Caution:please do not edit the _cypher_contract class name

Compile _cypher_contract.java and execute the following command:

 cd ContractExample/src/cases/HR/
 javac -cp ../../jdk/classes _cypher_contract.java

A _cypher_contract.class will be generated in the current directory.

Deploy your smart contract

In order to deploy your newly generated _cypher_contract.class on the Cypherium blockchain network, you need to convert the binary file into string format. We provide one file2str tool to complete this step (similar tools on the network are also available):

We provide executable files for Linux, Mac platforms, and users can select the target type according to your OS systems.

Generate string format

Suppose you local at src folder and you OS are linux,Below is the usage:

 ../../../file2str/linux/file2str _cypher_contract.class

Deploy smart contract by cypher console

Eidt abi and Defines a contract class

abi=[{"inputs":[{"name":"initialSupply","type":"uint256"},{"name":"tokenName","type":"string"},{"name":"tokenSymbol","type":"string"}],"stateMutability":"nonpayable","typ":"constructor"}	]
sample=cph.contract(abi)

Set the java smart contract bin to the SampleHEX variable

SampleHEX="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"

Unlock your account

personal.unlockAccount(cph.accounts[0])//personal.unlockAccount("0x80e4d44d9d24fa90dc7fb07d360f920953cb52dc")

Publish it to the cypher blockchain

theSample=sample.new(1,{from:cph.accounts[0],data:SampleHEX,gas:3000000})

{
  abi: [{
      inputs: [{...}, {...}, {...}],
      stateMutability: "nonpayable",
      typ: "constructor"
  }],
  address: undefined,
  transactionHash: "0x3ecde60e82d301c8ccb7846d01ed8eae900fc25b8363e638fc3f63a246d19118"
}

Operate or edit smart contract

Open the HR.htm by your chrome by desktop OS After deploying the Smart Contract according to the above diagram, you can click Get contract info, From's Balance, To's Balance, Transfer to perform related smart contract executions.

Get contract address

cph.getTransactionReceipt("0x3ecde60e82d301c8ccb7846d01ed8eae900fc25b8363e638fc3f63a246d19118")

{ blockHash: "0x143554d1cfb1cf3be26209f636ed61def145e1450fc193a1c3064cc586cdd354", blockNumber: 328, contractAddress: "0xf76fcdfafab908dcbd8e7d662d715236538fe79e", cumulativeGasUsed: 854136, from: "0x80e4d44d9d24fa90dc7fb07d360f920953cb52dc", gasUsed: 854136, logs: [], root: "0x21c2d3ddeb1fb1cfb9e3cf2d0aae15db625b95bd4efb0d784cde322c9163996d", to: null, transactionHash: "0x3ecde60e82d301c8ccb7846d01ed8eae900fc25b8363e638fc3f63a246d19118", transactionIndex: 0 }

Set target rpcnode Rpc node and Contract address

RpcNode:http://34.210.170.38:8000 Contract address:0xf76fcdfafab908dcbd8e7d662d715236538fe79e

Fix your account address for your Role

Student:0x80e4d44d9d24fa90dc7fb07d360f920953cb22dc

Fix personal info data

name:jaxon sex:man age:26 contact:18642437977

Resume check the Fix personal info data

Fix the Student id(Student account):0x80e4d44d9d24fa90dc7fb07d360f920953cb22dc Finally click the Resume button you will see the personal info data

javax.cypher.Cypnet library

In addition, we also provide the following functions in the javax.cypher.Cypnet library.

Get the account balance

public​ ​static​ ​native​ ​long​ ​BalanceOf​(String paramString);

Change the account balance

public​ ​static​ ​native​ ​boolean​ ​ChangeBalance​(String paramString, ​long​ paramLong);

Get key-value

 public​ ​static​ ​native​ ​boolean​ GetState(​String​ paramString1, ​String​ paramString2, byte​[] paramArrayOfByte);

Set key-value

 public​ ​static​ ​native​ ​boolean​ SetState(​String​ paramString1, ​String​ paramString2, byte​[] paramArrayOfByte);

We provide support for most JDK1.8 libraries in jdk/classes, and you may design smart contracts in accordance with traditional Java programs.