[Share] Invented a new wheel for calling Python from JAVA

[john.huang]

I'm a java developer and need call Python from JAVA sometimes. I google that but didn't find a satisfy way to do it. The Jython is clear and simple, but it is not CPython and doesn't support external C package, also slower than CPython. Process and Runtime method is not easily to get a well format result. Other bridge solutions solve such problems, but inject additional codes. So finally I decided to invent the wheel myself, took me 5 nights, now it works fine in my project, so I hope it has a little help for you too. It is open source and can find it on GitHub: jpserve (https://github.com/johnhuang-cn/jpserve)

JPserve provides a simple way to call Python and exchange the result by well format JSON, few performance loss.

The following is a simple sample.
At first, install jpserve by "pip -install jpserve" and start jpserve on Python side, jpserve is a script executor server executes the script from JAVA side.

from jpserve.jpserve import JPServe
serve = JPServe(("localhost", 8888))
serve.start()

Output:
INFO:JPServe:JPServe starting...
INFO:JPServe:JPServe listening in localhost 8888

Then call Python from JAVA side:

PyServeContext.init("localhost", 8888);
PyExecutor executor = PyServeContext.getExecutor();
script = "a = 2\n"
         + "b = 3\n"
         + "_result_ = a * b";
    
PyResult rs = executor.exec(script);
System.out.println("Result: " + rs.getResult());

Output:
Result: 6