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[Ethereum] remix판으로 구동해보기 본문

IT일기(하반기)/ETHEREUM

[Ethereum] remix판으로 구동해보기

겉바속촉 2020. 7. 31. 15:57
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  1. http://remix.ethereum.org/  방문

  2. Storage.sol 작성

  3. compile

  4. ganache 가동 (이더리움 네트워 구동 : 예 HTTP://127.0.0.1:7545 )

 

5. deploy

 

6. servlet 프로젝트 생성

 

7. index.html 작성

<!DOCTYPE html>
<html>
<head>
<meta charset="EUC-KR">
<title>Insert title here</title>
</head>
<body>
	<form action="main" method="get">
	<input type="hidden" name="sign" value="spon">
	후원금 <input name="amount"> <input type="submit" value="후원하기">
	
	</form>

</body>
</html>

 

8. MainServlet.java 작성 : (별명주기) @WebServlet("/main")

 

 

 

 

 

MainServlet.java

 

package web.controller;

import java.io.IOException;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


@WebServlet("/main")
public class MainServlet extends HttpServlet {
	
   
    
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		process(request, response);
	
	}

	
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		process(request, response);
	}
	
	protected void process(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("utf-8");
		String sign = request.getParameter("sign");
		if(sign !=null) {
			
		}else { //리퀘스트 전달 개체
			RequestDispatcher disp = request.getRequestDispatcher("error.jsp");
			disp.forward(request, response);		
		
		}
		
		}


}

 

 

 

그럼 이제 error.jsp 만들어주기

 

 

 

 

error.jsp

 

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
 <script src="https://code.jquery.com/jquery-3.5.1.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css">
<title>Insert title here</title>
</head>
<body>
 ${errMsg }
</body>
</html>

 

 

다시 MainServlet으로 가셔서 다음과 같이 추가해주세요:)

 

 

다음을 또 추가

 

 

 

 

클래스 생성

 

 

 

 

 

 

이제 maven으로 해주기

 

 

 

 

 

 

 

source folder

 

 

 

 

 

 

 

EthereumSponService.java

 

package web.service;

import java.io.IOException;
import java.math.BigInteger;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

import org.web3j.abi.FunctionEncoder;
import org.web3j.abi.FunctionReturnDecoder;
import org.web3j.abi.TypeReference;
import org.web3j.abi.datatypes.Function;
import org.web3j.abi.datatypes.Type;
import org.web3j.abi.datatypes.Uint;
import org.web3j.protocol.Web3j;
import org.web3j.protocol.admin.Admin;
import org.web3j.protocol.admin.methods.response.PersonalListAccounts;
import org.web3j.protocol.core.DefaultBlockParameterName;
import org.web3j.protocol.core.methods.request.Transaction;
import org.web3j.protocol.core.methods.response.EthCall;
import org.web3j.protocol.core.methods.response.EthGetTransactionCount;
import org.web3j.protocol.core.methods.response.EthSendTransaction;
import org.web3j.protocol.http.HttpService;

public class EthereumSponService {

	public void service() {
		 try {
             String amount=request.getParameter("amount");
             // 이더리움 네트웍 접속...
             
             //계약 주소 세팅
             String contract="0x36Ca42AC6f89443170167e384cBA919A9FA20Cc1";
             
             //이더리움 네트웍 접속
             Web3j web3j=Web3j.build(new HttpService("HTTP://127.0.0.1:7545"));
             
             //accounts 얻기
             Admin admin = Admin.build(new HttpService("HTTP://127.0.0.1:7545"));
               PersonalListAccounts personalListAccounts = admin.personalListAccounts().send();
             List<String> addressList = personalListAccounts.getAccountIds();
             
             //토탈 후원금 보기
                contractGetCall(addressList, contract, web3j);
               
             //후원금 적립
                contractSetCall(amount, addressList, web3j, contract);
                
             //토탈 후원금 보기
                contractGetCall(addressList, contract, web3j);
               
          }catch(Exception e) {
             e.printStackTrace();
          }
  }else

	{
		// 침해대응코드
		RequestDispatcher disp = request.getRequestDispatcher("error.jsp");
		request.setAttribute("errMsg", "올바른 요청이 아닙니다");
		disp.forward(request, response);
	}
	}

	}

	private void contractGetCall(List<String> addressList, String contract, Web3j web3j) throws Exception {
		// get function 호출(block생성 안함)
		Function function = new Function("get", Collections.emptyList(), Arrays.asList(new TypeReference<Uint>() {
		}));

		Transaction transaction = Transaction.createEthCallTransaction(addressList.get(0), contract,
				FunctionEncoder.encode(function));

		EthCall ethCall = web3j.ethCall(transaction, DefaultBlockParameterName.LATEST).send();

		List<Type> decode = FunctionReturnDecoder.decode(ethCall.getResult(), function.getOutputParameters());

		System.out.println("ethCall.getResult() = " + ethCall.getResult());
		System.out.println("getValue = " + decode.get(0).getValue());
		System.out.println("getType = " + decode.get(0).getTypeAsString());
	}

	private void contractSetCall(String amount, List<String> addressList, Web3j web3j, String contract)
			throws Exception {
		// set function 호출

		BigInteger amount_ = new BigInteger(amount);
		Function function2 = new Function("add", Arrays.asList(new Uint(amount_)), Collections.emptyList());

		EthGetTransactionCount ethGetTransactionCount = web3j
				.ethGetTransactionCount(addressList.get(0), DefaultBlockParameterName.LATEST).sendAsync().get();

		BigInteger nonce = ethGetTransactionCount.getTransactionCount();
		Transaction transaction2 = Transaction.createFunctionCallTransaction(addressList.get(0), nonce,
				Transaction.DEFAULT_GAS, null, contract, FunctionEncoder.encode(function2));

		EthSendTransaction ethSendTransaction = web3j.ethSendTransaction(transaction2).send();

		String transactionHash = ethSendTransaction.getTransactionHash();

		// ledger에 쓰여지기 까지 기다리기.

		Thread.sleep(2000);

		System.out.println("transactionHash = " + transactionHash);

	}

}

 

 

 

 

 

 

 

그냥 apply

 

 

 

 

 

 

 

 

web3j maven 구글링

 

 

 

 

 

 

 

 

 

2_Test/pom.xml

 

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>2_Test</groupId>
  <artifactId>2_Test</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  <build>
    <sourceDirectory>src</sourceDirectory>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.8.0</version>
        <configuration>
          <release>11</release>
        </configuration>
      </plugin>
      <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <version>3.2.3</version>
        <configuration>
          <warSourceDirectory>WebContent</warSourceDirectory>
        </configuration>
      </plugin>
    </plugins>
  </build>
  
  <dependencies>
  <!-- https://mvnrepository.com/artifact/org.web3j/core -->
<dependency>
    <groupId>org.web3j</groupId>
    <artifactId>core</artifactId>
    <version>4.2.0</version>
</dependency>
  
  
  </dependencies>
</project>

 

 

여기까지 하고 나면 EthereumSponService에서 에러가 사라질 것 (import부분만)

request부분만 오류

그래서 다음과 같이 괄호안에 String amount 넣어주시고

그 아랫줄은 필요없으니까 지워주세요

 

 

 

그리고 그 아랫부분으로 가셔서

else if 문은 모두 지워주세요

즉 다음과 같이 표시한 부분을 날려주시면 됩니다

 

 

 

 

 

MainServlet.java로 가셔서 다음 표시한 부분을 추가해주세요

 

 

 

 

구동 전 가나슈 상태

 

 

 

block 1 클릭해서 created contract address 복사해서

EthereumSponService에다가 넣어주기\

 

 

 

그리고 메서드 맞는 지 확인해줄것

 

 

 

 

 

이제 구동해서 1을 후원해볼게요

 

 

그리고 가나슈에서 블록 생성되었는 지 확인해줄것

 

eclipse 콘솔창 확인

 

 

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