基于Flask创建Python服务端，并调用Java客户端

from flask import Flask, request
class AiServer(object):
    def __init__(self):
        server = Flask(__name__)
        server.route('/post', methods=['POST'])(self.post)
        server.run(host="0.0.0.0", port=8000, threaded=True)
    def post(self):
        if request.method == "POST":
            print("get post")
            response_data = request.json
            print("response_data", response_data)
            return "Hello"
if __name__ == '__main__':
    AiServer()

import java.io.*;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.charset.StandardCharsets;
public class App {
    public static void main(String args[]){
        HttpURLConnection conn = null;
        DataOutputStream os = null;
        try{
            URL url = new URL("http://localhost:8000/post"); //important to add the trailing slash after add
            String inputData = "{\"x\": 5, \"y\": 8, \"text\":\"random text\"}";
            byte[] postData = inputData.getBytes(StandardCharsets.UTF_8);
            conn = (HttpURLConnection) url.openConnection();
            conn.setDoOutput(true);
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Content-Type", "application/json");
            conn.setRequestProperty( "charset", "utf-8");
            conn.setRequestProperty("Content-Length", Integer.toString(inputData.length()));
            os = new DataOutputStream(conn.getOutputStream());
            os.write(postData);
            os.flush();
            if (conn.getResponseCode() != 200) {
                throw new RuntimeException("Failed : HTTP error code : "
                        + conn.getResponseCode());
            }
            BufferedReader br = new BufferedReader(new InputStreamReader((conn.getInputStream())));
            String output;
            System.out.println("Output from Server .... \n");
            while ((output = br.readLine()) != null) {
                System.out.println(output);
            }
            conn.disconnect();
    } catch (MalformedURLException e) {
        e.printStackTrace();
    }catch (IOException e){
        e.printStackTrace();
    }finally
        {
            if(conn != null)
            {
                conn.disconnect();
            }
        }
    }
}