Java程序中调用Python脚本的方法

Posted 2020-10-11

本文引自http://www.cnblogs.com/liinux/p/5481849.html

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；

　　

1 2 3 4 5 6 7 8 9 10 11

<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；

1 import org.python.util.PythonInterpreter;
2 
3 public class JpythonScript {
4     public static void main(String args[]) {
5         PythonInterpreter interpreter = new PythonInterpreter();
6         interpreter.exec("days=(‘mod‘,‘Tue‘,‘Wed‘,‘Thu‘,‘Fri‘,‘Sat‘,‘Sun‘); ");
7         interpreter.exec("print days[1];");
8     }
9 }

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