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This article introduces the relevant knowledge of "what is the ethernet java development package web3j". Many people will encounter this dilemma in the operation of the actual case, so let the editor lead you to learn how to deal with these situations I hope you can read it carefully and be able to achieve something!

Web3j (org.web3j) is the Java version of the Ethernet JSON RPC interface protocol encapsulation implementation, if you need to connect your Java application or Android application to Ethernet Square, or if you want to use java to develop a wallet application, then use web3j.

The function of web3j is quite complete. In addition to the complete package of ethernet JSON RPC, it also includes complete account management and transaction management implementation. But the biggest problem with web3j is poor documentation. If you want to quickly learn how to use web3j to develop java or Android apps that support Ethernet Square, you can visit this web3j tutorial, which is by far the fastest learning path known.

The functions of web3j are organized in different packages. The following figure shows the main packages of org.web3j and their dependencies:

The encapsulation of the core:JSON RPC protocol is mainly implemented by the package org.web3j.core, which depends on the key and signature-related functions provided by the org.web3j.crypto package and the java/solidity type mapping support provided by the org.web3j.abi package.

The console:org.web3j.console package implements a command line program web3j that can be run separately, which we will use to generate Java wrapper classes for solidity contracts, where the org.web3j.codegen package implements code generation from abi to java wrapper classes.

Node related: the org.web3j.infura package encapsulates the http access service interface to the Infura common node, while org.web3j.geth and org.web3j.parity encapsulate the management interface of the two commonly used Ethernet square node software.

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