Using Compiled Scripts - Java Scripting

Java examples for Scripting:Run Script

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Description

Using Compiled Scripts

Demo Code

import javax.script.Bindings;
import javax.script.Compilable;
import javax.script.CompiledScript;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;

public class Main {
  public static void main(String[] args) throws Exception {
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine engine = manager.getEngineByName("JavaScript");
    if (!(engine instanceof Compilable)) {
      System.out.println("Script compilation not supported.");
      return;/*from  w  w w. j a v  a2  s . com*/
    }

    Compilable comp = (Compilable) engine;

    String script = "print(n1 + n2)";
    CompiledScript cScript = comp.compile(script);

    // Store n1 and n2 script variables in a Bindings
    Bindings scriptParams = engine.createBindings();
    scriptParams.put("n1", 2);
    scriptParams.put("n2", 3);
    cScript.eval(scriptParams);

    // Execute the script again with different values for n1 and n2
    scriptParams.put("n1", 9);
    scriptParams.put("n2", 7);
    cScript.eval(scriptParams);

  }
}

Result


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