使用 Jython 在 Spring 引导应用程序中包含 Python 脚本失败 - 找不到模块
Including Python Script in Spring Boot Application with Jython fails - module not found
我正在努力适应 python+java 交互，所以我写了一些 python-脚本，我想从我的 [=17= 执行该脚本].该脚本位于（相对于 .java-文件）路径 /scripts_py/getStockPrice.py 中，该路径包含 getStockPrice-方法（参见下面的代码）。所以我集成了 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（我的想法是，我可能需要多次执行该脚本 - 所以我尝试寻找此 class 的 singleton 实例保存脚本，所以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
我将嵌入式 tomcat 与 Spring Boot（可执行 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>
我保留 运行 的错误说，脚本未定义 - 我尝试使用和不使用文件结尾 (.py) 来定义它，两者都没有改变任何东西:
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [de.fr.stockticker.pythoninteraction.CronService]: Constructor threw exception; nested exception is Traceback (most recent call last):
File "<string>", line 4, in <module>
ImportError: No module named getStockPrice
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:217) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:87) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1312) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
... 81 common frames omitted
Caused by: org.python.core.PyException: ImportError: No module named getStockPrice
at org.python.core.Py.ImportError(Py.java:329) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.core.imp.import_first(imp.java:1230) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.core.imp.import_module_level(imp.java:1361) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.core.imp.importName(imp.java:1528) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.core.ImportFunction.__call__(__builtin__.java:1285) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.core.PyObject.__call__(PyObject.java:433) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.core.__builtin__.__import__(__builtin__.java:1232) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.core.imp.importAll(imp.java:1647) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.pycode._pyx0.f[=16=](<string>:4) ~[na:na]
at org.python.pycode._pyx0.call_function(<string>) ~[na:na]
at org.python.core.PyTableCode.call(PyTableCode.java:173) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.core.PyCode.call(PyCode.java:18) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.core.Py.runCode(Py.java:1687) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.core.Py.exec(Py.java:1731) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.util.PythonInterpreter.exec(PythonInterpreter.java:268) ~[jython-standalone-2.7.2.jar:2.7.2]
at de.fr.stockticker.pythoninteraction.PythonScriptSingleton.initScript(PythonScriptSingleton.java:28) ~[classes/:na]
at de.fr.stockticker.pythoninteraction.PythonScriptSingleton.getInstance(PythonScriptSingleton.java:13) ~[classes/:na]
at de.fr.stockticker.pythoninteraction.CronService.<init>(CronService.java:12) ~[classes/:na]
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_251]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_251]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_251]
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_251]
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:204) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
... 83 common frames omitted
我能够 运行 您的程序部分使用 Jython - 我无法从内部依赖于 numpy 的 yahoo 获取库存流程，看起来 Jython 不支持 numpy，因为它是 cpython图书馆。
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();
}
您将能够克服您的错误，但您会看到错误
Missing required dependencies ['numpy']
所以我尝试使用另一个 java python 库 jep 并进行了如下更改
@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>
确保安装 jep 模块 - 它有本地库
pip install jeb
添加java库路径加载原生库
-Djava.library.path=/usr/local/lib/python2.7/site-packages/jep
参考 - https://github.com/ninia/jep/wiki/Getting-Started
我正在努力适应 python+java 交互，所以我写了一些 python-脚本，我想从我的 [=17= 执行该脚本].该脚本位于（相对于 .java-文件）路径 /scripts_py/getStockPrice.py 中，该路径包含 getStockPrice-方法（参见下面的代码）。所以我集成了 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（我的想法是，我可能需要多次执行该脚本 - 所以我尝试寻找此 class 的 singleton 实例保存脚本，所以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
我将嵌入式 tomcat 与 Spring Boot（可执行 JAR-文件）和 jython-standalone 2.7.2:
<dependency>
<groupId>org.python</groupId>
<artifactId>jython-standalone</artifactId>
<version>2.7.2</version>
</dependency>
我保留 运行 的错误说，脚本未定义 - 我尝试使用和不使用文件结尾 (.py) 来定义它，两者都没有改变任何东西:
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [de.fr.stockticker.pythoninteraction.CronService]: Constructor threw exception; nested exception is Traceback (most recent call last):
File "<string>", line 4, in <module>
ImportError: No module named getStockPrice
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:217) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:87) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:1312) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
... 81 common frames omitted
Caused by: org.python.core.PyException: ImportError: No module named getStockPrice
at org.python.core.Py.ImportError(Py.java:329) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.core.imp.import_first(imp.java:1230) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.core.imp.import_module_level(imp.java:1361) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.core.imp.importName(imp.java:1528) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.core.ImportFunction.__call__(__builtin__.java:1285) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.core.PyObject.__call__(PyObject.java:433) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.core.__builtin__.__import__(__builtin__.java:1232) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.core.imp.importAll(imp.java:1647) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.pycode._pyx0.f[=16=](<string>:4) ~[na:na]
at org.python.pycode._pyx0.call_function(<string>) ~[na:na]
at org.python.core.PyTableCode.call(PyTableCode.java:173) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.core.PyCode.call(PyCode.java:18) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.core.Py.runCode(Py.java:1687) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.core.Py.exec(Py.java:1731) ~[jython-standalone-2.7.2.jar:2.7.2]
at org.python.util.PythonInterpreter.exec(PythonInterpreter.java:268) ~[jython-standalone-2.7.2.jar:2.7.2]
at de.fr.stockticker.pythoninteraction.PythonScriptSingleton.initScript(PythonScriptSingleton.java:28) ~[classes/:na]
at de.fr.stockticker.pythoninteraction.PythonScriptSingleton.getInstance(PythonScriptSingleton.java:13) ~[classes/:na]
at de.fr.stockticker.pythoninteraction.CronService.<init>(CronService.java:12) ~[classes/:na]
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_251]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_251]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_251]
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_251]
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:204) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
... 83 common frames omitted
我能够 运行 您的程序部分使用 Jython - 我无法从内部依赖于 numpy 的 yahoo 获取库存流程，看起来 Jython 不支持 numpy，因为它是 cpython图书馆。
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();
}
您将能够克服您的错误，但您会看到错误
Missing required dependencies ['numpy']
所以我尝试使用另一个 java python 库 jep 并进行了如下更改
@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>
确保安装 jep 模块 - 它有本地库
pip install jeb
添加java库路径加载原生库
-Djava.library.path=/usr/local/lib/python2.7/site-packages/jep
参考 - https://github.com/ninia/jep/wiki/Getting-Started