如何使用来自 Java 类的参数调用 Python 脚本
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How to call a Python script with arguments from Java class
提问by Sushin K.Kumar
I am using Python 3.4.
我正在使用Python 3.4。
I have a Python script myscript.py:
我有一个 Python 脚本myscript.py：
import sys
def returnvalue(str) :
if str == "hi" :
return "yes"
else :
return "no"
print("calling python function with parameters:")
print(sys.argv[1])
str = sys.argv[1]
res = returnvalue(str)
target = open("file.txt", 'w')
target.write(res)
target.close()
I need to call this python script from the java class PythonJava.java
我需要从 java 类调用这个 python 脚本 PythonJava.java
public class PythonJava
{
String arg1;
public void setArg1(String arg1) {
this.arg1 = arg1;
}
public void runPython()
{ //need to call myscript.py and also pass arg1 as its arguments.
//and also myscript.py path is in C:\Demo\myscript.py
}
and I am calling runPython()from another Java class by creating an object of PythonJava
我runPython()通过创建一个对象从另一个 Java 类调用PythonJava
obj.setArg1("hi");
...
obj.runPython();
I have tried many ways but none of them are properly working. I used Jython and also ProcessBuilder but the script was not write into file.txt. Can you suggest a way to properly implement this?
我尝试了很多方法，但没有一个能正常工作。我使用了 Jython 和 ProcessBuilder，但脚本没有写入 file.txt。你能提出一种正确实施的方法吗？
采纳答案by mkaran
Have you looked at these? They suggest different ways of doing this:
你看过这些吗？他们提出了不同的方法来做到这一点：
Call Python code from Java by passing parameters and results
How to call a python method from a java class?
In short one solution could be:
简而言之，一种解决方案可能是：
public void runPython()
{ //need to call myscript.py and also pass arg1 as its arguments.
//and also myscript.py path is in C:\Demo\myscript.py
String[] cmd = {
"python",
"C:/Demo/myscript.py",
this.arg1,
};
Runtime.getRuntime().exec(cmd);
}
edit: just make sure you change the variable name from str to something else, as noted by cdarke
编辑：只需确保将变量名称从 str 更改为其他名称，如 cdarke 所述
Your python code (change str to something else, e.g. arg and specify a path for file):
您的 Python 代码（将 str 更改为其他内容，例如 arg 并指定文件路径）：
def returnvalue(arg) :
if arg == "hi" :
return "yes"
return "no"
print("calling python function with parameters:")
print(sys.argv[1])
arg = sys.argv[1]
res = returnvalue(arg)
print(res)
with open("C:/path/to/where/you/want/file.txt", 'w') as target: # specify path or else it will be created where you run your java code
target.write(res)
