Methods for invoking Python scripts in Java programs

This article is quoted from http://www.cnblogs.com/liinux/p/5481849.html

In program development, it is sometimes necessary to call the relevant Python script in a Java program, the following records the first steps and possible solutions to the problem.

1. Create a new MAVEN project in Eclipse;

2. Add the following dependency package to the Pom.xml file after the update MAVEN project;

　　

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<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, write the following test code;

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. Test:

The following error occurred:

console:failed to install ': java.nio.charset.UnsupportedCharsetException:cp0. Exception in thread "main" importerror:cannot import site module and its dependencies:no module named Sitedetermine if T He following attributes is correct:  * sys.path: [' ... python\\jython\\2.7.0\\lib ', ' __classpath__ ', ' __pyclasspath __/'] This    attribute might is including the wrong directories, such as from CPython  * sys.prefix:***\jython\2.7.0<  C3/>this attribute is set by the system property python.home, although it can be often automatically determined by the    Location of the Jython jar fileyou can use the-s option or python.import.site=false to not import the site module

5, Problem solving:

The refactoring code is as follows:

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, compile successfully.

7, problem-solving reference:

http://bugs.jython.org/issue2355

Methods for invoking Python scripts in Java programs