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python call java jar

时间:2017-08-15 15:04:03      阅读:339      评论:0      收藏:0      [点我收藏+]

python脚本如何调用Java的jar文件呢?

HelloWorld.java

public class HelloWorld {

    public static void main(String[] args) {
        System.out.println("hello world");
        String input = args[0];
        String output = input.toUpperCase();
        System.out.print(output);
    }

}

javacaller.py

# python3
# coding = utf-8

from subprocess import Popen, PIPE, STDOUT

mycmd = [java, -jar, HelloWorld.jar, logan]

pipe = Popen(mycmd, stdout=PIPE, stderr=STDOUT)

for line in pipe.stdout:
    print(line, type(line))
    if isinstance(line, bytes):
        line_decode = line.decode(utf-8)
        print(decode:, line_decode, type(line_decode))

print(done)

输出:

b‘hello world\n‘ <class ‘bytes‘>
decode: hello world
<class ‘str‘>
b‘LOGAN‘ <class ‘bytes‘>
decode: LOGAN <class ‘str‘>
done

注意点:

1. java的 System.out.println自带换行

2. java返回的结果需要decode

 

参考资料:

How to get the output from .jar execution in python codes? 

python call java jar

原文:http://www.cnblogs.com/gattaca/p/7364934.html

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