python 如何安装py4j

Mac安装：Mac安装：

pip 安装

pipinstalpy4j
py4j.jar包路径：/usr/share/py4j/py4j0.x.jaror/usr/local/share/py4j/py4j0.x.jar

conda 安装(或安装Anaconda-Navigator)

condainstalpy4j
py4j.jar包路径：/anaconda3//share/py4j/py4j0.x.jar

使用：

1、java代码

//需要导入py4j.jar包
importpy4j.GatewayServer;
importjava.util.Random;
publicclassEntryPoint{
privatestaticfinalRandomrandom=newRandom();
publicintrandInt(){
returnrandom.nextInt();
}
publicstaticvoidmain(String[]args){
EntryPointapp=newEntryPoint();
//py4j服务
GatewayServergatewayServer=newGatewayServer(app);
gatewayServer.start();
System.out.println("GatewayServerStarted");
}
}

2、Python代码

frompy4j.java_gatewayimportJavaGateway
#初始化
gateway=JavaGateway()
defmain():
#在Java-EntryPoint中调用randint函数
a=gateway.entry_point.randInt()
print(a)
if__name__='__main__':
main()

注意：

1.导入py4j.jar包

2.运行Java代码

3.运行Python代码(必须在2之后)

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