1. Remix开发智能合约

1.1. web3j简介

web3j是一个轻量级、高度模块化、响应式、类型安全的Java和Android类库提供丰富API，用于处理以太坊智能合约及与以太坊网络上的客户端(节点)进行集成。

可以通过它进行以太坊区块链的开发，而无需为你的应用平台编写集成代码。

1.2. 新建项目

新建一个maven项目ethsample

项目ethsample

1.3. 配置pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.cayden.ethereum</groupId>
    <artifactId>ethsample</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>org.web3j</groupId>
            <artifactId>core</artifactId>
            <version>2.2.1</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.2</version>
        </dependency>
    </dependencies>
</project>

1.4. 新建ParityClient

package com.cayden.ethereum.client;

import org.web3j.protocol.http.HttpService;
import org.web3j.protocol.parity.Parity;

/**
 * Created by cuiran on 18/7/6.
 */
public class ParityClient {
    private static String ip = "http://127.0.0.1:8545/";
    private ParityClient(){}
    private static class ClientHolder{
        private static final Parity parity = Parity.build(new HttpService(ip));
    }
    public static final Parity getParity(){
        return ClientHolder.parity;
    }
}

如图所示

如图所示