Call a JavaScript function three times : Script Engines « JDK 6 « Java

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Java » JDK 6 » Script Engines

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Call a JavaScript function three times


    



import javax.script.Compilable;

import javax.script.CompiledScript;

import javax.script.ScriptEngine;

import javax.script.ScriptEngineManager;

import javax.script.ScriptException;



public class JDK6CompileTest {

  public static void main(String args[]) {

    ScriptEngineManager manager = new ScriptEngineManager();

    ScriptEngine engine = manager.getEngineByName("javascript");

    engine.put("counter", 0);

    if (engine instanceof Compilable) {

      Compilable compEngine = (Compilable) engine;

      try {

        CompiledScript script = compEngine.compile("function count(){counter=counter+1;return counter;}; count();");

        System.out.println(script.eval());

        System.out.println(script.eval());

        System.out.println(script.eval());

      } catch (ScriptException e) {

        System.err.println(e);

      }

    } else {

      System.err.println("Engine can't compile code");

    }

  }

}

/*1.0

2.0

3.0*/

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4.	Variables bound through ScriptEngine
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6.	Any script have to be compiled into intermediate code.
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19.	Retrieving the Metadata of Script Engines
20.	Retrieving the Supported File Extensions of a Scripting Engine
21.	Retrieving the Supported Mime Types of a Scripting Engine
22.	Retrieving the Registered Name of a Scripting Engine
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24.	Read and execute a script source file
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33.	Compresses a String containing JavaScript by removing comments and whitespace.
34.	Escape and unescape javascript code
35.	Utility to take xml string and convert it to a javascript based tree within html.

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