python 如何安装py4j

pip install py4j

py4j.jar包路径：/usr/share/py4j/py4j0.x.jar or /usr/local/share/py4j/py4j0.x.jar

conda install py4j

py4j.jar包路径：/anaconda3/share/py4j/py4j0.x.jar

// 需要导入py4j.jar包

import py4j.GatewayServer;

import java.util.Random;

public class EntryPoint {

    private static final Random random = new Random();

    public int randInt() {

        return random.nextInt();

    }

    public static void main(String[] args) {

        EntryPoint app = new EntryPoint();

        // py4j服务

        GatewayServer gatewayServer = new GatewayServer(app);

        gatewayServer.start();

        System.out.println("Gateway Server Started");

    }

}

from py4j.java_gateway import JavaGateway

# 初始化

gateway = JavaGateway()

def main():

    # 调用Java-EntryPoint中的randInt函数

    a = gateway.entry_point.randInt()

    print(a)

if __name__ == '__main__':

    main()