Java程序中怎么实现调用Python脚本
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在程序开发中,有时候需要Java程序中调用相关Python脚本,以下内容记录了先关步骤和可能出现问题的解决办法。
1、在Eclipse中新建Maven工程;
2、pom.xml文件中添加如下依赖包之后update maven工程;
org.python jython 2.7.0 org.python jython-standalone 2.7.0
3、编写如下测试代码;
import org.python.util.PythonInterpreter; public class JpythonScript { public static void main(String args[]) { PythonInterpreter interpreter = new PythonInterpreter(); interpreter.exec("days=('mod','Tue','Wed','Thu','Fri','Sat','Sun'); "); interpreter.exec("print days[1];"); } }
4、测试:
出现如下错误:
console: Failed to install '': java.nio.charset.UnsupportedCharsetException: cp0.
Exception in thread "main" ImportError: Cannot import site module and its dependencies: No module named site
Determine if the following attributes are correct:
* sys.path: ['...python\\jython\\2.7.0\\Lib', '__classpath__', '__pyclasspath__/']
This attribute might be including the wrong directories, such as from CPython
* sys.prefix:***\jython\2.7.0
This attribute is set by the system property python.home, although it can
be often automatically determined by the location of the Jython jar file
You can use the -S option or python.import.site=false to not import the site module
5、问题解决:
重构代码如下:
import java.util.Properties; import org.python.util.PythonInterpreter; public class JpythonScript { public static void main(String args[]) { Properties props = new Properties(); props.put("python.home", "path to the Lib folder"); props.put("python.console.encoding", "UTF-8"); props.put("python.security.respectJavaAccessibility", "false"); props.put("python.import.site", "false"); Properties preprops = System.getProperties(); PythonInterpreter.initialize(preprops, props, new String[0]); PythonInterpreter interpreter = new PythonInterpreter(); interpreter.exec("days=('mod','Tue','Wed','Thu','Fri','Sat','Sun'); "); interpreter.exec("print days[1];"); } }
6、编译成功。
7、解决问题参考:
http://bugs.jython.org/issue2355
补充:jpython抛错Cannot import site module的解决方法
Exception in thread "main" ImportError: Cannot import site module and its dependencies: No module named site
public class JpythonScript { public static void main(String args[]) { Properties props = new Properties(); props.put("python.import.site", "false"); Properties preprops = System.getProperties(); PythonInterpreter.initialize(preprops, props, new String[0]); PythonInterpreter interpreter = new PythonInterpreter(); interpreter.exec("days=('mod','Tue','Wed','Thu','Fri','Sat','Sun'); "); interpreter.exec("print days[1];"); }
// 进行复杂类接受处理 Mapres = new HashMap (); res.put("1", "Danny"); res.put("2", "Fanny"); PythonInterpreter interpM = new PythonInterpreter(); interpM.execfile("./src/com/DataDeal.py"); PyFunction pyFunctionM = (PyFunction) interpM.get("main", PyFunction.class); Map tableM = new HashMap (); tableM.put(new PyString("conf"), PyJavaType.wrapJavaObject(res)); PyDictionary pydM = new PyDictionary(tableM);
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