Java 在带有Jython的Spring引导应用程序中包含Python脚本失败-找不到模块

我正在尝试习惯python+java交互，因此我编写了一个小python脚本，希望从我的

Spring Boot应用程序中执行该脚本。该脚本位于（相对于
.java
-文件）路径
/scripts\u py/getStockPrice.py
中，该路径包含
getStockPrice
-方法（请参见下面的代码）。因此，我集成了
jython
，并尝试执行以下
CronJob
：

@Component
public class CronService {

    private PythonScriptSingleton pss = PythonScriptSingleton.getInstance();
    private final Logger logger = LoggerFactory.getLogger(CronService.class);

    //call every 5 sec
    @Scheduled(fixedRate = 5000)
    public void initStockPriceAPICall() {
        this.getStockPrice("NFLX");
    }

    public void getStockPrice(String ticker) {
        String result = (String) (Object) this.pss.getFunc_getPriceForTicker().__call__(new PyString(ticker));
        try {
            logger.info("Price is " + result);
        } catch (NullPointerException e) {
            logger.info("Catched NPE");
        }

    }
}

PythongScriptSingleton
（想法是，我可能需要多次执行该脚本-因此我尝试使用这个类的
singleton
实例来保存该脚本，因此我不需要每次都重新编译它：

public class PythonScriptSingleton {

    private static PythonScriptSingleton ps;

    public static PythonScriptSingleton getInstance() {
        if (ps == null) {
            ps = new PythonScriptSingleton();
            ps.initScript();
        }
        return ps;
    }

    private PyObject func_getPriceForTicker;

    private PythonScriptSingleton() {

    }

    private void initScript() {
        PythonInterpreter interpreter = new PythonInterpreter();
        String fileUrlPath = "/scripts_py";
        String scriptName = "getStockPrice.py";
        interpreter.exec("import sys\n" + "import os \n" + "sys.path.append('" + fileUrlPath + "')\n" + "from "
                + scriptName + " import * \n");
        String funcName = "getStockPrice";
        PyObject someFunc = interpreter.get(funcName);
        this.func_getPriceForTicker = someFunc;
        interpreter.close();
    }

    public PyObject getFunc_getPriceForTicker() {
        return func_getPriceForTicker;
    }
}

Python脚本：

from yahoo_fin import stock_info as si

def getStockPrice(ticker):
    price = si.get_live_price(ticker)
    return price

我正在将嵌入式的
tomcat
与
Spring Boot
（可执行的
JAR
-文件）和
jython standalone 2.7.2
一起使用：

   <dependency>
        <groupId>org.python</groupId>
        <artifactId>jython-standalone</artifactId>
        <version>2.7.2</version>
    </dependency>

我可以部分使用Jython运行您的程序-我无法从雅虎获得股票流程，因为雅虎内部依赖于numpy，而且Jython不支持numpy，因为它是cpython库

private void initScript() { 
    PythonInterpreter interpreter = new PythonInterpreter(); 
    String fileUrlPath = "/users/sagar/demo/src/main/resources/python"; 
    interpreter.exec("import sys"); 
    interpreter.exec("sys.path.append('" + fileUrlPath + "')"); 
    interpreter.exec("from getStockPrice import *"); this.func_getPriceForTicker = 
    interpreter.get("getStockPrice", PyFunction.class); 
    interpreter.close(); 
}

您将能够克服错误，但您将看到错误

Missing required dependencies ['numpy'] 

因此，我尝试使用另一个java python库，并做了如下更改

@SpringBootApplication
@EnableScheduling
public class DemoApplication  {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

    private final Logger logger = LoggerFactory.getLogger(DemoApplication.class);

    //call every 5 sec
    @Scheduled(fixedRate = 5000)
    public void initStockPriceAPICall() throws JepException {
        this.getStockPrice("NFLX");
    }

    private void getStockPrice(String ticker) throws JepException {
        try (Interpreter interp = new SharedInterpreter()) {
            String fileUrlPath = "/users/sagar/demo/src/main/resources/python";
            interp.exec("import sys");
            interp.exec("sys.path.append('" + fileUrlPath + "')");
            interp.exec("from getStockPrice import *");
            interp.set("ticker", ticker);
            interp.exec("price = getStockPrice(ticker)");
            Object result = interp.getValue("price");
            logger.info("Price is " + result);
        }
    }
}

pom.xml

<dependency>
    <groupId>black.ninia</groupId>
    <artifactId>jep</artifactId>
    <version>3.9.0</version>
</dependency>

添加java库路径以加载本机库

-Djava.library.path=/usr/local/lib/python2.7/site-packages/jep

参考-


pip install jeb

-Djava.library.path=/usr/local/lib/python2.7/site-packages/jep