在python中使用subprocess.Popen运行java主类 [英] running java main class using subprocess.Popen in python

问题描述

我想使用subprocess.Popen()通过python执行java主类main.java.main.java 需要 3 个参数.

I want to execute java main class main.java by python using subprocess.Popen(). main.java takes 3 args.

我想知道怎么做?例如我有一个 HelloWorld.java 类:

I wonder how to do it? For example I have a HelloWorld.java class:

public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello World!" + args[0]);
    } }

我尝试使用以下命令在 python 中调用它:

I tried to call it in python using the command:

print (subprocess.Popen('java C:/Users/testing/Hello.Main sayHello',shell=True, stdout=subprocess.PIPE).stdout.read())

print (subprocess.Popen('java C:/Users/testing/Hello.Main sayHello', shell=True, stdout=subprocess.PIPE).stdout.read())

其中 'sayHello' 是我想传入的字符串参数.它说

where 'sayHello' is the string args I want to pass in. It said

错误:无法找到或加载主类 C:.Users.testing.Hello.Main

谢谢

推荐答案

您可以通过以下方式运行扩展名为 .class 的 java 文件:

You may run your java file with extension .class the following way:

java your.path.Main arg1 arg2

哪里，

• java - 命令，运行 Java 解释器
• your.path.Main - 类的全名(不含 .class)
• arg1 arg2 - 参数(由空格或 " 之间写入)

• java - command, which runs the Java interpreter
• your.path.Main - full name of your class (without .class)
• arg1 arg2 - the arguments (written by spaces or between ")

此外，当您格式化此行时，它会在 subprocess.Popen() 中作为参数传输.

Further, when you formatted this line, it transmits in subprocess.Popen() as argument.

subprocess.Popen('java your.path.Main arg1 arg2')

我不是 Python 程序员，因为我建议您阅读有关此方法的文档.

I'm not Python programmer, because I advice you to read documentation about this method.

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