In this example we shall show you how to import a package in script. We are using theScriptEngine interface, that provides methods for basic scripting functionality. To import a package in script one should perform the following steps:

• Create aStringBuilder to build the script. Append to it all the commands to be executed, along with the import package command. Get the String representation of the StringBuilder, to be used as the script.
• Create a newScriptEngineManager. The ScriptEngineManager implements a discovery and instantiation mechanism for ScriptEngine classes and also maintains a collection of key/value pairs storing state shared by all engines created by the Manager.
• Use thegetEngineByExtension(String extension) API method to look up and create aScriptEngine for the js extension.
• Use theeval(String script) method to execute the script,

as described in the code snippet below.  

package com.javacodegeeks.snippets.core;import javax.script.ScriptEngineManager;import javax.script.ScriptEngine;import javax.script.ScriptException; public class ImportPackage {    public static void main(String[] args) {        // Create script engine manager and set js engine  ScriptEngineManager manager = new ScriptEngineManager();  ScriptEngine engine = manager.getEngineByExtension("js");   try {engine.eval(getScript());  } catch (ScriptException e) {e.printStackTrace();  }    }     // Get script method that includes the import of java.util package    private static String getScript() {  StringBuilder sb = new StringBuilder();  sb.append("importPackage(java.util);");  sb.append("");  sb.append("var today = new Date();");  sb.append("println('Today is ' + today);");  return sb.toString();    }}

Output:

Today is Sat Aug 11 2012 20:06:08 GMT+0300 (EEST)

  
This was an example of how to import a package with a script in Java.

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