Java程序中調用Python腳本的方法

在程序開發中，有時候需要Java程序中調用相關Python腳本，以下內容記錄了先關步驟和可能出現問題的解決辦法。

1、在Eclipse中新建Maven工程；

2、pom.xml文件中添加如下依賴包之后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、編寫如下測試代碼；

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、測試：

出現如下錯誤：

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、問題解決：

重構代碼如下：

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、編譯成功。

7、解決問題參考：

http://bugs.jython.org/issue2355