如何使用PY4J从python中调用java [英] How to call java from python using PY4J
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问题描述
我想用Py4J库从python调用java,
I want to call java from python with Py4J library,
from py4j.java_gateway import JavaGateway
gateway = JavaGateway() # connect to the JVM
gateway.jvm.java.lang.System.out.println('Hello World!')
我遇到以下错误:Py4JNetworkError:尝试连接到Java服务器时发生错误。似乎没有JVM在运行,如何修复?
I've got the following error: "Py4JNetworkError: An error occurred while trying to connect to the Java server". It's seems that no JVM is running, how to fix that?
推荐答案
package test.test;
import py4j.GatewayServer;
public class AdditionApplication {
public int addition(int first, int second) {
return first + second;
}
public static void main(String[] args) {
AdditionApplication app = new AdditionApplication();
// app is now the gateway.entry_point
GatewayServer server = new GatewayServer(app);
server.start();
}
}
创建一个新类并运行它(导入py4j0。 8.jar在'py4j-0.8\py4j-0.8\py4j-java'第一个),然后运行python程序
create a new class and run it(import py4j0.8.jar at 'py4j-0.8\py4j-0.8\py4j-java' first),then run python program
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