Java程序中实现调用Python脚本的方法详解

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；

<dependency>
<groupId>org.python</groupId>
<artifactId>jython</artifactId>
<version>2.7.0</version>
</dependency>
<dependency>
<groupId>org.python</groupId>
<artifactId>jython-standalone</artifactId>
<version>2.7.0</version>
</dependency>

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
Map<String, Object> res = new HashMap<String, Object>();
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<PyObject, PyObject> tableM = new HashMap<PyObject, PyObject>();
tableM.put(new PyString("conf"), PyJavaType.wrapJavaObject(res));
PyDictionary pydM = new PyDictionary(tableM);