How to develop the application of ethernet workshop with Eclipse+Web3j

This article mainly explains "how to develop ethernet application with Eclipse+Web3j". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "how to develop the ethernet application by Eclipse+Web3j".

1. Install Gradle

Download the latest version 4.8.1 Gradle package on the official website, and then select a directory to extract it, such as d:\ tool. There is no need to configure environment variables, just decompress it.

Note: the Gradle package contains a first-level gradle-4.8.1 directory, so the final installation directory is: d:\ tool\ gradle-4.8.1.

2. Install the Gradle plug-in

The latest Oxygen version of Eclipse already integrates the Gradle plug-in by default, so you can create a Gradle project directly:

If you need to install manually, click the menu _ _ [help] _-> [Eclipse Marketplace], then search for gradle, and select _ _ Buildship Gradle Integration 2.0 install _ to install:

3. Create a Gradle project

Select the menu _ [new] _-> [Project...], and select _ _ Gradle Project__: in the pop-up wizard dialog box.

Then give the project a name, such as test:

On the project options page, first enable the Override workspace settings option to fill in the Gradle installation directory, such as we installed to d:\ tool\ gradle-4.8.1:

4. Configure the Gradle project

Open the project's build.gradle file, add web3j and logback dependencies to dependencies, and add the maveCentral () repository:

Plugins {id 'java-library'} dependencies {api' org.apache.commons:commons-math4:3.6.1' implementation 'com.google.guava:guava:23.0' testImplementation' junit:junit:4.12' / / add web3j and logback dependencies on compile 'org.web3j:core:3.3.0',' ch.qos.logback:logback-core:1.2.3' 'ch.qos.logback:logback-classic:1.2.3'} repositories {jcenter () / / add maven warehouse mavenCentral ()}

Note: after updating the build.gradle file, be sure to perform a manual refresh to make the new settings take effect!

Right-click the project name in the _ _ Package Explorer__ window, and then click _ _ [graddle] _ _-> [Refresh Gradle Project]:

5. Create a new class

Create a new class App, and choose the default settings:

Then modify the App.java code as follows:

Package test;import org.web3j.protocol.Web3j;import org.web3j.protocol.http.HttpService;public class App {public static void main (String [] args) throws Exception {Web3j web3j = Web3j.build (new HttpService ("http://localhost:8545")); String v = web3j.web3ClientVersion (). Send (). GetWeb3ClientVersion (); System.out.println (v);}} 6, run

First, start ganache-cli on your local machine. For windows platform, it is recommended to use our Ethernet Fong development kit Ethbox:

Then click _ _ [run] _ _-> [Run As]-> [Java Application]:

If all goes well, you will first see Gradle downloading the dependency package on the Eclipse console, and then see the result of your code execution:

BINGO!

At this point, I believe you have a deeper understanding of "how to develop ethernet applications with Eclipse+Web3j". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!