package cn.netkiller.ethereum;

import java.io.IOException;

import org.web3j.protocol.Web3j;
import org.web3j.protocol.core.methods.response.Web3ClientVersion;
import org.web3j.protocol.http.HttpService;

public class Web3JClient {
	// TODO Auto-generated method stub

	public static void main(String[] args) {
		String url = "http://172.16.0.1:8545/";
		Web3j web3j = Web3j.build(new HttpService(url)); // defaults to http://localhost:8545/

		try {
			Web3ClientVersion web3ClientVersion = web3j.web3ClientVersion().send();
			String clientVersion = web3ClientVersion.getWeb3ClientVersion();
			System.out.println(clientVersion);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

}
		
		

运行结果

		
Geth/v1.8.8-stable-4bb3c89d/linux-amd64/go1.10.2				
		
		

除了 TCP 方式连接，还支持 IPC 方式。这种方式比较少用，可以使用 localhost 替代。

		
// OS X/Linux/Unix:
Web3j web3 = Web3j.build(new UnixIpcService("/path/to/socketfile"));
...

// Windows
Web3j web3 = Web3j.build(new WindowsIpcService("/path/to/namedpipefile"));
...